Method and apparatus for bidirectional demodulation of digitally

Details Method and apparatus for bidirectional demodulation of digitally Method and apparatus for bidirectional demodulation of digitally

1996-12-05

1999-06-01

Tse, Young T.

Pulse or digital communications

Testing

Signal noise

375340, 375346, 370333, 455135, H04Q 120, H04B 1700

Patent

active

059094656

ABSTRACT:
A system and method for bidirectionally demodulating data symbols transmitted through a communication channel. The method includes sequentially receiving and storing a first plurality of known data symbols, a second plurality of unknown data symbols, and a third plurality of known data symbols. Thereafter, a first block of the unknown data symbols received nearer the first plurality of known data symbols is forward-demodulated. Likewise, a second block of the unknown data symbols received nearer the third plurality of known data symbols is backward-demodulated. The forward- and backward-demodulation of the unknown data symbols determines quality values (figure-of-merits based on at least one of signal power, noise power and a combination of signal power plus noise power) indicative of demodulation qualities of the unknown data symbols that are compared to produce a best direction indication. Upon determining the best direction indication, either the forward- or backward-demodulation steps are repeated for subsequent blocks of unknown data symbols.

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