Digital adaptive transversal filter for spread spectrum receiver

Details Digital adaptive transversal filter for spread spectrum receiver Digital adaptive transversal filter for spread spectrum receiver

1992-10-06

1993-12-07

Cangialosi, Salvatore

Pulse or digital communications

Repeaters

Testing

36472416, 36472419, H04L 2730

Patent

active

052689271

ABSTRACT:
A digital adaptive transversal filter includes an interface circuit for regulating and digitizing analog input signals, which comprise of multiple spread-spectrum signals, additive thermal noise and additive multiple narrowband interferers, to provide multi-bit digital input signals. A digital finite impulse response filter having a set of variable digital weight coefficients responds to the multi-bit digital input signals to generate digital output signals which contain a reduced amount of narrowband interference. A digital weight generator responds to the digital input and digital output signals for updating the digital weight coefficients, and a reset generator periodically resets the digital weight coefficients to zero initial values.
In a preferred embodiment an 8-tap, 8-bit digital adaptive transversal filter operating at 22 MHz was implemented with discrete components and a processing gain of 30 dB was demonstrated.

REFERENCES:
patent: 4271525 (1981-06-01), Watanabe
patent: 4591669 (1986-05-01), Duttweiler et al.
patent: 5043814 (1991-08-01), Lish
patent: 5050119 (1991-09-01), Lish
patent: 5132985 (1992-07-01), Hashimoto et al.
patent: 5181225 (1993-01-01), Neeser et al.
patent: 5185762 (1993-02-01), Schilling

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