1. A method for producing a gain-smoothed codevector during decoding of an encoded wideband signal from a set of wideband signal encoding parameters, said method comprising:
finding a codevector in relation to at least one first wideband signal encoding parameter of said set;
calculating a first factor representative of voicing in the wideband signal in response to at least one second wideband signal encoding parameter of said set;
calculating a second factor representative of stability of said wideband signal in response to at least one third wideband signal encoding parameter of said set;
calculating a smoothing gain based on said first and second factors; and
amplifying the found codevector with said smoothing gain to thereby produce said gain-smoothed codevector.', 'finding a codevector in relation to at least one first wideband signal encoding parameter of said set;', 'calculating a first factor representative of voicing in the wideband signal in response to at least one second wideband signal encoding parameter of said set;', 'calculating a second factor representative of stability of said wideband signal in response to at least one third wideband signal encoding parameter of said set;', 'calculating a smoothing gain based on said first and second factors; and', 'amplifying the found codevector with said smoothing gain to thereby produce said gain-smoothed codevector.

2. A gain-smoothed codevector producing method as claimed in claim 1, wherein:
finding a codevector comprises finding an innovative codevector in an innovative codebook in relation to said at least one first wideband signal encoding parameter; and the smoothing gain calculation comprises calculating the smoothing gain also in relation to an innovative codebook gain forming a fourth wideband signal encoding parameter of said set.', 'finding a codevector comprises finding an innovative codevector in an innovative codebook in relation to said at least one first wideband signal encoding parameter; and the smoothing gain calculation comprises calculating the smoothing gain also in relation to an innovative codebook gain forming a fourth wideband signal encoding parameter of said set.

3. A gain-smoothed codevector producing method as claimed in claim 1, wherein:
finding a codevector comprises finding a codevector in a codebook in relation to said at least one first wideband signal encoding parameter; and
said at least one first wideband signal encoding parameter comprises an innovative codebook index.', 'finding a codevector comprises finding a codevector in a codebook in relation to said at least one first wideband signal encoding parameter; and', 'said at least one first wideband signal encoding parameter comprises an innovative codebook index.

4. A gain-smoothed codevector producing method as claimed in claim 1, wherein:
finding a codevector comprises finding an innovative codevector in an innovative codebook in relation to said at least one first wideband signal encoding parameter; and
said at least one second wideband signal encoding parameter comprises the following parameters:
a pitch gain computed during encoding of the wideband signal;
a pitch delay computed during encoding of the wideband signal;
an index j of a low-pass filter selected during encoding of the wideband signal and applied to a pitch codevector computed during encoding of the wideband signal; and
an innovative codebook index computed during encoding of the wideband signal.', 'finding a codevector comprises finding an innovative codevector in an innovative codebook in relation to said at least one first wideband signal encoding parameter; and', 'said at least one second wideband signal encoding parameter comprises the following parameters:', 'a pitch gain computed during encoding of the wideband signal;', 'a pitch delay computed during encoding of the wideband signal;', 'an index j of a low-pass filter selected during encoding of the wideband signal and applied to a pitch codevector computed during encoding of the wideband signal; and', 'an innovative codebook index computed during encoding of the wideband signal.

5. A gain-smoothed codevector producing method as claimed in claim 1, wherein said at least one third wideband signal encoding parameter comprises coefficients of a linear prediction filter calculated during encoding of the wideband signal.

6. A gain-smoothed codevector producing method as claimed in claim 1, wherein:
finding a codevector comprises finding an innovative codevector in an innovative codebook in relation to an index k of said innovative codebook, said index k forming said at least one first wideband signal encoding parameter; and
calculating a first factor comprises computing a voicing factor rv by means of the following relation:
rv=(Evâx88x92Ec)/(Ev+Ec)', 'finding a codevector comprises finding an innovative codevector in an innovative codebook in relation to an index k of said innovative codebook, said index k forming said at least one first wideband signal encoding parameter; and', 'calculating a first factor comprises computing a voicing factor rv by means of the following relation:
rv=(Evâx88x92Ec)/(Ev+Ec)', 'rv=(Evâx88x92Ec)/(Ev+Ec)', 'where:
Ev is the energy of a scaled adaptive codevector bvT;
Ec is the energy of a scaled innovative codevector gck;
b is a pitch gain computed during encoding of the wideband signal;
T is a pitch delay computed during encoding of the wideband signal;
vT is an adaptive codebook vector at pitch delay T;
g is an innovative codebook gain computed during encoding of the wideband signal;
k is an index of the innovative codebook computed during encoding of the wideband signal; and
ck is the innovative codevector of said innovative codebook at index k.', 'Ev is the energy of a scaled adaptive codevector bvT;', 'Ec is the energy of a scaled innovative codevector gck;', 'b is a pitch gain computed during encoding of the wideband signal;', 'T is a pitch delay computed during encoding of the wideband signal;', 'vT is an adaptive codebook vector at pitch delay T;', 'g is an innovative codebook gain computed during encoding of the wideband signal;', 'k is an index of the innovative codebook computed during encoding of the wideband signal; and', 'ck is the innovative codevector of said innovative codebook at index k.

7. A gain-smoothed codevector producing method as claimed in claim 6, wherein the voicing factor rv has a value located between âx88x921 and 1, wherein value 1 corresponds to a pure voiced signal and value âx88x921 corresponds to a pure unvoiced signals.

8. A gain-smoothed codevector producing method as claimed in claim 7, wherein calculating a smoothing gain comprises computing a factor λ using the following relation:
λ=0.5(1âx88x92rv).', 'λ=0.5(1âx88x92rv).

9. A gain-smoothed codevector producing method as claimed in claim 6, wherein a factor λ=0 indicates a pure voiced signal and a factor λ=1 indicates a pure unvoiced signal

10. A gain-smoothed codevector producing method as claimed in claim 1, wherein calculating a second factor comprises determining a distance measure giving a similarity between adjacent, successive linear prediction filters computed during encoding of the wideband signal

11. A gain-smoothed codevector producing method as claimed in claim 10, wherein:
the wideband signal is sampled prior to encoding, and is processed by frames during encoding and decoding; and
determining a distance measure comprises calculating an Immitance Spectral Pair distance measure between the Immitance Spectral Pairs in a present frame n of the wideband signal and the Immitance Spectral Pairs of a past frame nâx88x921 of the wideband signal through the following relation:', 'the wideband signal is sampled prior to encoding, and is processed by frames during encoding and decoding; and', 'determining a distance measure comprises calculating an Immitance Spectral Pair distance measure between the Immitance Spectral Pairs in a present frame n of the wideband signal and the Immitance Spectral Pairs of a past frame nâx88x921 of the wideband signal through the following relation:', 'D
s

=


âx88x91

i
=
1


p
-
1


âx81¢



âx81¢


(


isp
i

(
n
)


-

ispSUBi

(

n
-
1

)



)

2





where p is the order of the linear prediction filters.', 'where p is the order of the linear prediction filters.12. A gain-smoothed codevector producing method as claimed in claim 11, wherein calculating a second factor comprises mapping the Immitance Spectral Pair distance measure Ds to said second factor θ through the following relation:
θ=1.25âx88x92D s/400000.0', 'θ=1.25âx88x92D s/400000.0', 'bounded by 0âx89¦Î¸âx89¦1.13. A gain-smoothed codevector producing method as claimed in claim 1, wherein calculating a smoothing gain comprises calculating a gain smoothing factor Sm based on both the first λ and second θ factors through the following relation:
S m=λθ.', 'S m=λθ.14. A gain-smoothed codevector producing method as claimed in claim 13, wherein the factor Sm has a value approaching 1 for an unvoiced and stable wideband signal, and a value approaching 0 for a pure voiced wideband signal or an unstable wideband signal.15. A gain-smoothed codevector producing method as claimed in claim 1, wherein:
finding a codevector comprises finding an innovative codevector in an innovative codebook in relation to said at least one first wideband signal encoding parameter;
the wideband signal is sampled prior to encoding, and is processed by frames and subframes during encoding and decoding; and
calculating a smoothing gain comprises computing an initial modified gain g0 by comparing an innovative codebook gain g computed during encoding of the wideband signal to a threshold given by the initial modified gain from the past subframe gâx88x921 as follows:', 'finding a codevector comprises finding an innovative codevector in an innovative codebook in relation to said at least one first wideband signal encoding parameter;', 'the wideband signal is sampled prior to encoding, and is processed by frames and subframes during encoding and decoding; and', 'calculating a smoothing gain comprises computing an initial modified gain g0 by comparing an innovative codebook gain g computed during encoding of the wideband signal to a threshold given by the initial modified gain from the past subframe gâx88x921 as follows:', 'if g < g âx88x92 1 then
g0 = g Ãx97 1.19
bounded by g0 âx89¦ g âx88x92 1


and


if g âx89§ g âx88x92 1 then
g0 = g/1.19
bounded by g0 âx89§ g âx88x92 1.16. A gain-smoothed codevector producing method as claimed in claim 15, wherein calculating a smoothing gain comprises:
calculating a gain smoothing factor Sm based on both the first λ and second θ factors through the following relation:
S m=λθ; and

determining said smoothing gain through the following relation:
g s =S m *g 0+(1âx88x92S m)*g.', 'calculating a gain smoothing factor Sm based on both the first λ and second θ factors through the following relation:
S m=λθ; and', 'S m=λθ; and', 'determining said smoothing gain through the following relation:
g s =S m *g 0+(1âx88x92S m)*g.', 'g s =S m *g 0+(1âx88x92S m)*g.17. A method for producing a gain-smoothed codevector during decoding of an encoded signal from a set of signal encoding parameters, said signal containing stationary background noise and said method comprising:
finding a codevector in relation to at least one first signal encoding parameter of said set;
calculating at least one factor representative of stationary background noise in the signal in response to at least one second signal encoding parameter of said set;
calculating a smoothing gain using a non linear operation based on said noise representative factor; and
amplifying the found codevector with said smoothing gain to thereby produce said gain-smoothed codevector.', 'finding a codevector in relation to at least one first signal encoding parameter of said set;', 'calculating at least one factor representative of stationary background noise in the signal in response to at least one second signal encoding parameter of said set;', 'calculating a smoothing gain using a non linear operation based on said noise representative factor; and', 'amplifying the found codevector with said smoothing gain to thereby produce said gain-smoothed codevector.18. A method for producing a gain-smoothed codevector during decoding of an encoded wideband signal from a set of wideband signal encoding parameters, said method comprising:
finding a codevector in relation to at least one first wideband signal encoding parameter of said set;
calculating a factor representative of voicing in the wideband signal in response to at least one second wideband signal encoding parameter of said set;
calculating a smoothing gain using a non linear operation based on said voicing representative factor; and
amplifying the found codevector with said smoothing gain to thereby produce said gain-smoothed codevector.', 'finding a codevector in relation to at least one first wideband signal encoding parameter of said set;', 'calculating a factor representative of voicing in the wideband signal in response to at least one second wideband signal encoding parameter of said set;', 'calculating a smoothing gain using a non linear operation based on said voicing representative factor; and', 'amplifying the found codevector with said smoothing gain to thereby produce said gain-smoothed codevector.19. A method for producing a gain-smoothed codevector during decoding of an encoded wideband signal from a set of wideband signal encoding parameters, said method comprising:
finding a codevector in relation to at least one first wideband signal encoding parameter of said set;
calculating a factor representative of stability of said wideband signal in response to at least one second wideband signal encoding parameter of said set;
calculating a smoothing gain using a non linear operation based on said stability representative factor; and
amplifying the found codevector with said smoothing gain to thereby produce said gain-smoothed codevector.', 'finding a codevector in relation to at least one first wideband signal encoding parameter of said set;', 'calculating a factor representative of stability of said wideband signal in response to at least one second wideband signal encoding parameter of said set;', 'calculating a smoothing gain using a non linear operation based on said stability representative factor; and', 'amplifying the found codevector with said smoothing gain to thereby produce said gain-smoothed codevector.

20. A device for producing a gain-smoothed codevector during decoding of an encoded wideband signal from a set of wideband signal encoding parameters, said device comprising:
a codevector finder supplied with at least one first wideband signal encoding parameter of said set, and delivering a codevector found in relation to said at least one first wideband signal encoding parameter;
a voicing factor calculator supplied with at least one second wideband signal encoding parameter of said set, and delivering a first factor representative of voicing in the wideband signal in response to said at least one second wideband signal encoding parameter;
a stability factor calculator supplied with at least one third wideband signal encoding parameter of said set, and delivering a second factor representative of stability of said wideband signal in response to said at least one third wideband signal encoding parameter;
a smoothing gain calculator supplied with the first and second factors, and delivering a smoothing gain based on said first and second factors;
and an amplifier supplied with both the found codevector and the smoothing gain, and amplifying said found codevector with said smoothing gain to thereby produce said gain-smoothed codevector.', 'a codevector finder supplied with at least one first wideband signal encoding parameter of said set, and delivering a codevector found in relation to said at least one first wideband signal encoding parameter;', 'a voicing factor calculator supplied with at least one second wideband signal encoding parameter of said set, and delivering a first factor representative of voicing in the wideband signal in response to said at least one second wideband signal encoding parameter;', 'a stability factor calculator supplied with at least one third wideband signal encoding parameter of said set, and delivering a second factor representative of stability of said wideband signal in response to said at least one third wideband signal encoding parameter;', 'a smoothing gain calculator supplied with the first and second factors, and delivering a smoothing gain based on said first and second factors;', 'and an amplifier supplied with both the found codevector and the smoothing gain, and amplifying said found codevector with said smoothing gain to thereby produce said gain-smoothed codevector.

21. A device for producing a gain-smoothed codevector during decoding of an encoded wideband signal from a set of wideband signal encoding parameters, said device comprising:
means for finding a codevector in relation to at least one first wideband signal encoding parameter of said set;
means for calculating a first factor representative of voicing in the wideband signal in response to at least one second wideband signal encoding parameter of said set;
means for calculating a second factor representative of stability of said wideband signal in response to at least one third wideband signal encoding parameter of said set;
means for calculating a smoothing gain based on said first and second factors; and
means for amplifying the found codevector with said smoothing gain to thereby produce said gain-smoothed codevector.', 'means for finding a codevector in relation to at least one first wideband signal encoding parameter of said set;', 'means for calculating a first factor representative of voicing in the wideband signal in response to at least one second wideband signal encoding parameter of said set;', 'means for calculating a second factor representative of stability of said wideband signal in response to at least one third wideband signal encoding parameter of said set;', 'means for calculating a smoothing gain based on said first and second factors; and', 'means for amplifying the found codevector with said smoothing gain to thereby produce said gain-smoothed codevector.

22. A gain-smoothed codevector producing device as claimed in claim 21, wherein:
the means for finding a codevector comprises means for finding an innovative codevector in an innovative codebook in relation to said at least one first wideband signal encoding parameter; and
the smoothing gain calculating means comprises means for calculating the smoothing gain also in relation to an innovative codebook gain forming a fourth wideband signal encoding parameter of said set.', 'the means for finding a codevector comprises means for finding an innovative codevector in an innovative codebook in relation to said at least one first wideband signal encoding parameter; and', 'the smoothing gain calculating means comprises means for calculating the smoothing gain also in relation to an innovative codebook gain forming a fourth wideband signal encoding parameter of said set.

23. A gain-smoothed codevector producing device as claimed in claim 21, wherein:
the means for finding a codevector comprises means for finding a codevector in a codebook in relation to said at least one first wideband signal encoding parameter; and
said at least one first wideband signal encoding parameter comprises an innovative codebook index.', 'the means for finding a codevector comprises means for finding a codevector in a codebook in relation to said at least one first wideband signal encoding parameter; and', 'said at least one first wideband signal encoding parameter comprises an innovative codebook index.

24. A gain-smoothed codevector producing device as claimed in claim 21, wherein:
the means for finding a codevector comprises means for finding an innovative codevector in an innovative codebook in relation to said at least one first wideband signal encoding parameter; and
said at least one second wideband signal encoding parameter comprises the following parameters:
a pitch gain computed during encoding of the wideband signal;
a pitch delay computed during encoding of the wideband signal;
an index j of a low-pass filter selected during encoding of the wideband signal and applied to a pitch codevector computed during encoding of the wideband signal; and
an innovative codebook index computed during encoding of the wideband signal.', 'the means for finding a codevector comprises means for finding an innovative codevector in an innovative codebook in relation to said at least one first wideband signal encoding parameter; and', 'said at least one second wideband signal encoding parameter comprises the following parameters:
a pitch gain computed during encoding of the wideband signal;
a pitch delay computed during encoding of the wideband signal;
an index j of a low-pass filter selected during encoding of the wideband signal and applied to a pitch codevector computed during encoding of the wideband signal; and
an innovative codebook index computed during encoding of the wideband signal.', 'a pitch gain computed during encoding of the wideband signal;', 'a pitch delay computed during encoding of the wideband signal;', 'an index j of a low-pass filter selected during encoding of the wideband signal and applied to a pitch codevector computed during encoding of the wideband signal; and', 'an innovative codebook index computed during encoding of the wideband signal.

25. A gain-smoothed codevector producing device as claimed in claim 21, wherein said at least one third wideband signal encoding parameter comprises coefficients of a linear prediction filter calculated during encoding of the wideband signal.

26. A gain-smoothed codevector producing device as claimed in claim 21, wherein:
the means for finding a codevector comprises means for finding an innovative codevector in an innovative codebook in relation to an index k of said innovative codebook, said index k forming said at least one first wideband signal encoding parameter; and
the means for calculating a first factor comprises means for computing a voicing factor rv by means of the following relation:
rv=(Evâx88x92Ec)/(Ev+Ec)

where:
Ev is the energy of a scaled adaptive codevector bvT;
Ec is the energy of a scaled innovative codevector gck;
b is a pitch gain computed during encoding of the wideband signal;
T is a pitch delay computed during encoding of the wideband signal;
vT is an adaptive codebook vector at pitch delay T;
g is an innovative codebook gain computed during encoding of the wideband signal;
k is an index of the innovative codebook computed during encoding of the wideband signal; and
ck is the innovative codevector of said innovative codebook at index k.', 'the means for finding a codevector comprises means for finding an innovative codevector in an innovative codebook in relation to an index k of said innovative codebook, said index k forming said at least one first wideband signal encoding parameter; and', 'the means for calculating a first factor comprises means for computing a voicing factor rv by means of the following relation:
rv=(Evâx88x92Ec)/(Ev+Ec)', 'rv=(Evâx88x92Ec)/(Ev+Ec)', 'where:
Ev is the energy of a scaled adaptive codevector bvT;
Ec is the energy of a scaled innovative codevector gck;
b is a pitch gain computed during encoding of the wideband signal;
T is a pitch delay computed during encoding of the wideband signal;
vT is an adaptive codebook vector at pitch delay T;
g is an innovative codebook gain computed during encoding of the wideband signal;
k is an index of the innovative codebook computed during encoding of the wideband signal; and
ck is the innovative codevector of said innovative codebook at index k.', 'Ev is the energy of a scaled adaptive codevector bvT;', 'Ec is the energy of a scaled innovative codevector gck;', 'b is a pitch gain computed during encoding of the wideband signal;', 'T is a pitch delay computed during encoding of the wideband signal;', 'vT is an adaptive codebook vector at pitch delay T;', 'g is an innovative codebook gain computed during encoding of the wideband signal;', 'k is an index of the innovative codebook computed during encoding of the wideband signal; and', 'ck is the innovative codevector of said innovative codebook at index k.

27. A gain-smoothed codevector producing device as claimed in claim 26, wherein the voicing factor rv has a value located between âx88x921 and 1, wherein value 1 corresponds to a pure voiced signal and value âx88x921 corresponds to a pure unvoiced signals.

28. A gain-smoothed codevector producing device as claimed in claim 27, wherein the means for calculating a smoothing gain comprises means for computing a factor λ using the following relation:
λ=0.5(1âx88x92rv).', 'λ=0.5(1âx88x92rv).

29. A gain-smoothed codevector producing device as claimed in claim 28, wherein a factor, λ=0 indicates a pure voiced signal and a factor λ=1 indicates a pure unvoiced signal.

30. A gain-smoothed codevector producing device as claimed in claim 21, wherein the means for calculating a second factor comprises means for determining a distance measure giving a similarity between adjacent, successive linear prediction filters computed during encoding of the wideband signal.

31. A gain-smoothed codevector producing device as claimed in claim 30, wherein:
the wideband signal is sampled prior to encoding, and is processed by frames during encoding and decoding; and
the means for determining a distance measure comprises means for calculating an Imimitance Spectral Pair distance measure between the Immitance Spectral Pairs in a present frame n of the wideband signal and the Immitance Spectral Pairs of a past frame nâx88x921 of the wideband signal through the following relation:', 'the wideband signal is sampled prior to encoding, and is processed by frames during encoding and decoding; and', 'the means for determining a distance measure comprises means for calculating an Imimitance Spectral Pair distance measure between the Immitance Spectral Pairs in a present frame n of the wideband signal and the Immitance Spectral Pairs of a past frame nâx88x921 of the wideband signal through the following relation:', 'D
s

=


âx88x91

i
=
1


p
-
1


âx81¢



âx81¢


(


isp
i

(
n
)


-

ispSUBi

(

n
-
1

)



)

2





where p is the order of the linear prediction filters.', 'where p is the order of the linear prediction filters.

32. A gain-smoothed codevector producing device as claimed in claim 31, wherein the means for calculating a second factor comprises means for mapping the Immitance Spectral Pair distance measure Ds to said second factor θ through the following relation:
θ=1.25âx88x92D s/400000.0', 'θ=1.25âx88x92D s/400000.0', 'bounded by 0âx89¦Î¸âx89¦1.

33. A gain-smoothed codevector producing device as claimed in claim 21, wherein the means for calculating a smoothing gain comprises means for calculating a gain smoothing factor Sm based on both the first λ and second θ factors through the following relation:
S m=λθ.', 'S m=λθ.

34. A gain-smoothed codevector producing device as claimed in claim 33, wherein the factor Sm has a value approaching 1 for an unvoiced and stable wideband signal, and a value approaching 0 for a pure voiced wideband signal or an unstable wideband signal.

35. A gain-smoothed codevector producing device as claimed in claim 21, wherein:
the means for finding a codevector comprises means for finding an innovative codevector in an innovative codebook in relation to said at least one first wideband signal encoding parameter;
the wideband signal is sampled prior to encoding, and is processed by frames and subframes during encoding and decoding; and
the means for calculating a smoothing gain comprises means for computing an initial modified gain g0, said initial modified gain computing means comprising means for comparing an innovative codebook gain g computed during encoding of the wideband signal to a threshold given by the initial modified gain from the past subframe gâx88x921 as follows:', 'the means for finding a codevector comprises means for finding an innovative codevector in an innovative codebook in relation to said at least one first wideband signal encoding parameter;', 'the wideband signal is sampled prior to encoding, and is processed by frames and subframes during encoding and decoding; and', 'the means for calculating a smoothing gain comprises means for computing an initial modified gain g0, said initial modified gain computing means comprising means for comparing an innovative codebook gain g computed during encoding of the wideband signal to a threshold given by the initial modified gain from the past subframe gâx88x921 as follows:', 'if g < g âx88x92 1 then
g0 = g Ãx97 1.19
bounded by g âx89¦ g âx88x92 1


and


if g âx89§ g âx88x92 1 then
g0 = g/1.19
bounded by g0 âx89§ g âx88x92 1.

36. A gain-smoothed codevector producing method as claimed in claim 35, wherein the means for calculating a smoothing gain comprises means for calculating a gain smoothing factor Sm based on both the first λ and second θ factors through the following relation:
S m=λθ, and
means for determining said smoothing gain through the following relation:
g s =S m *g 0+(1âx88x92S m)*g.', 'S m=λθ, and', 'means for determining said smoothing gain through the following relation:
g s =S m *g 0+(1âx88x92S m)*g.', 'g s =S m *g 0+(1âx88x92S m)*g.

37. A cellular communication system for servicing a large geographical area divided into a plurality of cells, comprising:
mobile transmitter/receiver units;
cellular base stations respectively situated in said cells;
means for controlling communication between the cellular base stations;
a bidirectional wireless communication sub-system between each mobile unit situated in one cell and the cellular base station of said one cell, said bidirectional wireless communication sub-system comprising in both the mobile unit and the cellular base station (a) a transmitter including a decoder for encoding a wideband signal and means for transmitting the encoded wideband signal, and (b) a receiver including means for receiving a transmitted encoded wideband signal and a decoder for decoding the received encoded wideband signal;
wherein said decoder comprises means responsive to a set of wideband signal encoding parameters for decoding the received encoded wideband signal, and wherein said wideband signal decoding means comprises a device as recited in claim 21, for producing a gain-smoothed codevector during decoding of the encoded wideband signal from said set of wideband signal encoding parameters.', 'mobile transmitter/receiver units;', 'cellular base stations respectively situated in said cells;', 'means for controlling communication between the cellular base stations;', 'a bidirectional wireless communication sub-system between each mobile unit situated in one cell and the cellular base station of said one cell, said bidirectional wireless communication sub-system comprising in both the mobile unit and the cellular base station (a) a transmitter including a decoder for encoding a wideband signal and means for transmitting the encoded wideband signal, and (b) a receiver including means for receiving a transmitted encoded wideband signal and a decoder for decoding the received encoded wideband signal;', 'wherein said decoder comprises means responsive to a set of wideband signal encoding parameters for decoding t