Apparatus and method for scalable offline CDMA demodulation

Details Apparatus and method for scalable offline CDMA demodulation Apparatus and method for scalable offline CDMA demodulation

2006-04-04

2006-04-04

Ghebretinsae, Temesghen (Department: 2637)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S150000, C370S335000, C370S342000

Reexamination Certificate

active

07023902

ABSTRACT:
Techniques for scalable CDMA demodulation with maximum response latency are disclosed. In one aspect, a finger timing unit generates signals indicating cycle boundaries for a plurality of fingers, and an offline processing unit processes stored samples for those fingers in response to the signals. In another aspect, incoming samples are stored in a RAM, while finger timing is maintained using a plurality of counters. The RAM address is stored on symbol boundaries. Symbols for each finger are generated in an offline processing unit, clocked at a higher speed than the finger counters, from a RAM location computed using the stored RAM address. Various other aspects are also presented. These aspects provide for decoupling of the chip rate processing from chip time, which allows a single offline processing unit to service a plurality of fingers, thus reducing additional hardware required to support additional fingers while maintaining maximum latency requirements.

REFERENCES:
patent: 6650694 (2003-11-01), Brown et al.
patent: 2001/0028676 (2001-10-01), Ohsuge
patent: 2001/0036195 (2001-11-01), Garyantes et al.

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