| 摘要 |
PCT No. PCT/US96/08699 Sec. 371 Date Dec. 4, 1997 Sec. 102(e) Date Dec. 4, 1997 PCT Filed Jun. 7, 1996 PCT Pub. No. WO96/41427 PCT Pub. Date Dec. 19, 1996A system for digitally downconverting and despreading a multi-channel analog direct sequence spread spectrum signal is provided. The system includes a free-running, non-steering, clock generator which outputs an A/D sample clock, and an A/D sample clock having a rate which is an integral multiple of a chip rate of the spread spectrum signal. An A/D converter which receives the spread spectrum signal and the A/D sample clock and outputs a digitized multi-channel signal from the multi-channel spread spectrum signal, and a local pseudo-noise sequence signal source which outputs M local pseudo-noises, wherein M is an integer greater that 1 is also included. A multi-channel complex downconverter/polyphase filter which receives the digitized multi-channel signal and the A/D sample clock and a sample timing phase control signals, simultaneously filters and downconverts the digitized multi-channel signal to baseband, corrects timing phase misalignment between the digitized multi-channel signal and the locally generated pseudo-noise sequences, and outputs a multi-channel complex corrected baseband signal is provided.
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