Abstract
A method and apparatus to transmit turbo-encoded data in a multitone channel assigns the original data and selected parity bits across multitone subchannels allowing transmission of an entire turbo-encoded block withing one or few symbol time frame. Parity bits are selected by a procedure using data derived by optimization using simulation of a single-channel system. The optimization determines, for a specified bit error rate, for each possible number of information bits per symbol, the code rate corresponding to the lowest signal-to-noise ratio. Alternatively, in the simulation non-identical integer values may be applied to the channels to approximate non-integer values of code rate and information bits-per-channel in the aggregate. The optimized data are used to determine an optimal code rate and SNR for each channel. In assigning the respective bits to the channels, the number of parity bits in each channel are shared
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Claim
1. A method for allocating information bits and first and second parity bits to bins, each bin corresponding to a respective channel of a multichannel communications link, said first parity bits being generated by a first encoder and said second parity bits being generated by a second encoder, said second encoder receiving an interleaved version of an input data stream applied to said first encoder, said method comprising the steps of:
preparing a list of signal-to-noise ratio data indicating a low signal-to-noise ratio and constellation size required to send a given number of information bits for a plurality of simulated channels,
determining a respective channel characteristic of each of said simulated channels;
allocating at least one respective information bit of said information bits to each of said bins responsively to said list and said respective channel characteristics corresponding to said first parity bits of said bins; and
allocating said first and second parity bits among said bins such that the number of first parity bits allocated to said bins is substantially the same as the number of second parity bits,
wherein each of said steps of allocating includes determining a number of information bits that can be allocated to a channel without exceeding a power spectral density mask limit.', 'preparing a list of signal-to-noise ratio data indicating a low signal-to-noise ratio and constellation size required to send a given number of information bits for a plurality of simulated channels,', 'determining a respective channel characteristic of each of said simulated channels;', 'allocating at least one respective information bit of said information bits to each of said bins responsively to said list and said respective channel characteristics corresponding to said first parity bits of said bins; and', 'allocating said first and second parity bits among said bins such that the number of first parity bits allocated to said bins is substantially the same as the number of second parity bits,', 'wherein each of said steps of allocating includes determining a number of information bits that can be allocated to a channel without exceeding a power spectral density mask limit.
2. A method as in claim 1, wherein each of said steps of allocating further includes selecting from said list a signal to noise ratio corresponding to a number of information bits allocable to a respective channel such that transmitting a signal in respective channel at said signal-to-noise ratio does not require a power level in said respective channel that exceeds the power spectral density made limit.
3. A method as in claim 2, further comprising the step of allocating at least one of said parity bits to said first parity bits of said bins.
4. A method as in claim 3, wherein said step of preparing includes simulating a channel and determining for a given number of information bits transmitted in a channel, the constellation size or number of parity bits that corresponds to a low signal to noise ratio.
5. A method as in claim 4, wherein said simulating a channel includes simulating an AWGN (Additive White Gaussian Noise) channel.
6. A method as in claim 5, wherein said simulating a channel includes simulating a channel with at least one of Rayleigh fading and impulsive noise.']
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SUMMARY
ClaimChart-US6842491B2-STO
Patent number:US6842491B2
Claim Chart Type : SEP Claim Chart
Price: 200 €
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The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)
The information in grey was provided by the patent holder
The information in purple was extracted from the FrandAvenue
Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.