Programmable matched filter bank

Details Programmable matched filter bank Programmable matched filter bank

2005-01-11

2005-01-11

Corrielus, Jean B. (Department: 2637)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S143000, C375S343000

Reexamination Certificate

active

06842480

ABSTRACT:
A programmable matched filter bank comprises a sliding integrator and compensation calculation circuits. The integrator receives a chip stream of samples derived from a received spread-spectrum signal and integrates a number of the most recent samples, to form a common integration value. Each of the compensation calculation circuits receives the same most recent samples and receives a respective one of the possible reference spreading code sequences. In operation, each compensation calculation circuit derives a compensation value, and an associated circuit modifies the common integration value by the respective compensation value. The result is a value of correlation between the predetermined number of most recent samples, for each respective reference code sequence. The inventive approach reduces the number of bit adders and inverters in the implementation of a matched-filter, a programmable matched filter and a programmable matched filter bank for spread spectrum receivers.

REFERENCES:
patent: 5802102 (1998-09-01), Davidovici
patent: 5862133 (1999-01-01), Schilling
patent: 5933447 (1999-08-01), Tran et al.
patent: 5936369 (1999-08-01), Iwashita et al.
patent: 6061359 (2000-05-01), Schilling et al.
patent: 6714586 (2004-03-01), Yang et al.

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