Block-spreading code-division multiple-access demodulator with i

Details Block-spreading code-division multiple-access demodulator with i Block-spreading code-division multiple-access demodulator with i

1994-08-03

1995-10-31

Cangialosi, Salvatore

Pulse or digital communications

Repeaters

Testing

H04B 169

Patent

active

054636604

ABSTRACT:
In a block-spreading code-division multiple-access communication system a demodulator stores received chip data in a separate memory area for each transmitting station. Each area has a capacity of at least two blocks. When a complete block is received from a transmitting station, all blocks of data stored in the corresponding memory area are correlated against a set of product codewords, which are obtained by spreading a set of orthogonal codewords by the transmitting station's spreading code, to find the codeword that gives the maximum correlation value. For the oldest block, this correlation value and information identifying the codeword are output. For all blocks, the maximum correlation value and corresponding product codeword are used to calculate interference correction data, which are subtracted from the data in other memory areas.

REFERENCES:
patent: 5394434 (1995-02-01), Kawabe et al.
Yoon et al, "A Spread-Spectrum Multi-Access System with a Cascade of Co-Channel Interference Cancellers for Multipath Fading Channels", IEEE ISSSTA '92, 1992, pp. 87-90.
Ewerbring et al, "CDMA with Interference Cancellation: A Technique for High Capacity Wireless Systems", ICC '93 Geneva, 1993; pp. 1901-1906.
Li Fung Chang et al., "Performance of a CDMA Radio Communications System with Feed-Back Power Control and Multipath Dispersion", IEEE Global Telecommunications Conference, Dec. 2-5, 1991, Phoenix, Ariz. USA, vol. 2, pp. 1017-1021.

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