Code-division multiple-access demodulator with improved interfer

Details Code-division multiple-access demodulator with improved interfer Code-division multiple-access demodulator with improved interfer

1993-10-26

1995-02-28

Swann, Tod R.

Pulse or digital communications

Repeaters

Testing

380 34, H04K 100

Patent

active

053944348

ABSTRACT:
A demodulator for code-division multiple-access spread-spectrum communications stores received chip data in a separate memory area for each transmitting station. Each area has a capacity of at least two symbols. When a complete symbol is received from a transmitting station, all chip data stored in the corresponding memory area are correlated with the corresponding spreading code, and estimated symbol values are derived from the correlated values. The correlated or estimated value of the oldest symbol is output as a demodulated value. The difference between each estimated symbol value and the previous estimate for the same symbol is multiplied by the spreading code to generate remaining interference values, which are subtracted from all chip data stored in memory areas for other transmitting stations, thereby updating those data.

REFERENCES:
patent: 4528674 (1985-07-01), Sweeney et al.
patent: 5151919 (1992-09-01), Dent
patent: 5218619 (1993-06-01), Dent
Sklar, "Digital Communications, Fundamentals and Applications", Prentice Hall, 1988, pp. 571-573.
Yoon et al, "A Spread-Spectrum Multi-Access System with a Cascade of Co-Channel Interference Cancellers for Multipath Fading Channels", IEEE 2nd International Symposium on Spread Spectrum Techniques and Applications, 1992, pp. 87-90.

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