Coherent random access channel in a spread-spectrum communicatio

Details Coherent random access channel in a spread-spectrum communicatio Coherent random access channel in a spread-spectrum communicatio

1994-10-17

1998-10-13

Vo, Don N.

Pulse or digital communications

Repeaters

Testing

375206, 375208, 375367, 370209, 370320, 370335, 370342, 370515, H04B 1707

Patent

active

058223592

ABSTRACT:
A method and apparatus is provided to facilitate coherent communication in a random access channel. In encoding, reference symbols are inserted into a stream of access channel message data symbols and appended to a synchronization message to form a reference coded access channel transmission. Subsequently, the access channel transmission is prepared for transmission over a communication channel by being spread with a spreading code. In decoding, a known synchronization sequence is correlated with a received communication signal to generate a correlation peak when a synchronization message is present. The received communication signal is despread with a spreading code to derive a stream of reference samples and data samples. A channel response is determined from the correlation peak and revised based on estimates derived from the stream of reference samples. Finally, an estimated data symbol is detected from the stream of data samples by utilizing the revised channel response.

REFERENCES:
patent: 5204876 (1993-04-01), Bruckert et al.
patent: 5235614 (1993-08-01), Bruckert et al.
patent: 5329547 (1994-07-01), Ling
patent: 5353300 (1994-10-01), Lee et al.
patent: 5359624 (1994-10-01), Lee et al.
patent: 5412686 (1995-05-01), Ling

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