Abstract
A wireless digital subscriber communications system includes a base station and a subscriber unit and uses communications signals provided over a plurality of radio frequency channels. A processor provides an output phase signal corresponding to a selected output digital frequency, and a lookup table is used having two sets of predefined stored values pertaining to the amplitude of a signal for a single quadrant. In particular embodiments, predefined stored values include coarse angle approximations and fine angle approximations and a sine and cosine generator receives the phase signal and generates sine and cosine waveforms utilizing amplitude values obtained from the lookup table. In a further embodiment, the phase signal includes phase data and specifies the quadrant and the algebraic sign of the phase data, with the sine and cosine generator accessing the lookup table differently depending upon the quadrant and sine of the phase data, such that the lookup table provides an amplitude value from the sets of predefined stored values based on the phase data. A modulator combines the sine and cosine waveforms to produce the selected output digital frequency and modulates digital frequency.
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| 2G | 07/04/2004 | ISLD-200407-005 | INTERDIGITAL INC | No | Family Member | ||||
| Not Available | 07/04/2004 | ISLD-200407-005 | INTERDIGITAL INC | No | Family Member | ||||
| 2G | 13/09/2009 | ISLD-200911-005 | INTERDIGITAL INC |
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