Demodulator for symbols transmitted over a cellular channel

Details Demodulator for symbols transmitted over a cellular channel Demodulator for symbols transmitted over a cellular channel

1992-05-12

1994-05-17

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375101, H04L 2706

Patent

active

053134958

ABSTRACT:
A lower order Viterbi system for estimating symbols being transmitted over a digital cellular channel. The received signal is oversampled at a rate at least twice the frequency of the symbol duration. The energy contained in the main and interference symbol signal is thus sampled and permits a superior BER to be obtained. The branch metric for the lower order Viterbi algorithm is calculated using both signal samples. Channel status information is individually estimated for both samples, further improving system BER. The channel status is obtained for both frequency offset errors, amplitude fading and phase occurring within the channel.

REFERENCES:
patent: 5146475 (1992-09-01), Kubo
patent: 5199047 (1993-03-01), Koch
patent: 5202903 (1993-04-01), Okanoue

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