Multiplex communications – Wide area network – Packet switching
Patent
1992-12-07
1997-04-15
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 50, 370 77, 375350, H04J 102
Patent
active
056217307
ABSTRACT:
A digital receiver apparatus and method, designed for multiple simultaneous users, digitizes a received analog RF signal and tunes to multiple desired frequencies of the received signal on a time division multiplexed basis. After filtering by a finite impulse response (FIR) filter that also operates in time division multiplexing for multiple service bands, the selected signals are digitally demodulated and signal processed, again on a time-shared basis. Different service bands are accommodated at the same time by separate FIR filters, each including a coefficient memory for its particular service band. The multiplexed frequency signal for each band is multiplied by the coefficients of its respective FIR filter memory in a common complex multiplier. The results are demultiplexed and directed to respective accumulators for decimation in accordance with the FIR coefficient characteristics.
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Denson-Low W. K.
Duraiswamy V. D.
Hom Shiok
Hughes Aircraft Company
Olms Douglas W.
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