CDMA power control channel estimation using dynamic coefficient

Details CDMA power control channel estimation using dynamic coefficient CDMA power control channel estimation using dynamic coefficient

1997-02-28

1998-08-25

Kizou, Hassan

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

370318, 370342, 370522, 375206, 375343, H04J 1304, H04Q 720

Patent

active

057990115

ABSTRACT:
By time-sharing demodulator hardware between a primary data path (165), a power control data path (161), and a received signal strength indicator (RSSI) path (163), an entire power control data path (161) can be implemented in a demodulator (140) of a spread spectrum subscriber unit receiver with a low increase in gate count. The primary data path (165) and the power control data path (161) time-share a complex conjugate generator (270), a complex multiplier (280), and a real component extractor (290). Due to timing requirements, though, the channel estimation filter (240) of the primary data path cannot be time-shared with the power control data path. Instead, dynamic coefficient scaling is added to an infinite-duration impulse response (IIR) filter in the RSSI path (163) so that the IIR filter (250) with dynamic coefficient scaling can be time-shared between the RSSI path (163) and the power control data path (161).

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Viterbi, Andrew J., CDMA: Principles of Spread Spectrum Communication, Addison-Wesley Publishing Co., pp. 86-93, 1995.

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