Fractionally spaced maximum likelihood sequence estimation recei

Details Fractionally spaced maximum likelihood sequence estimation recei Fractionally spaced maximum likelihood sequence estimation recei

1992-03-24

1993-11-16

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 60, 375 94, H04B 1500

Patent

active

052630536

ABSTRACT:
The channel-impulse-response estimator (44') in a maximum-likelihood-sequence-estimation receiver produces channel-model parameters for a model that produces outputs not only for symbol times but also for intermediate times between the symbol times. A symbol-sequence-derivation circuit (42') determines the most-likely sequence on the basis of metrics computed from the differences between the received signal and the responses of the model to candidate sequences not only at the symbol times but also at the intermediate times. An interpolator (100) receives the symbol decisions from the symbol-sequence-derivation circuit (42') and generates intermediate values from them by simulating the Nyquist filter formed by the concatenation of pulse-shaping filters (22 and 24) in the transmitter and matched filters (36 and 37) in the receiver. The channel-impulse-response estimator (44') uses these values together with the derived-symbol values as inputs to its updating process to maintain the model.

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patent: 5146475 (1992-09-01), Kubo
patent: 5155744 (1992-10-01), Ringelhaan
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