Data transmission and reception within a spread-spectrum...

Details Data transmission and reception within a spread-spectrum... Data transmission and reception within a spread-spectrum...

2006-06-27

2006-06-27

Tran, Khai (Department: 2611)

Pulse or digital communications

Spread spectrum

C380S271000

Reexamination Certificate

active

07068701

ABSTRACT:
A long code scrambler has been provided to scramble the data bits prior to QAM mapping. Different data rates are accommodated by using different long code m-tuples sampled at the modulation symbol rate, where m equals 2, 4 or 6 for 4, 16 or 64 QAM, respectively. In order to support 1XEV-DV users employing multiple Walsh code channels, a long code 6-tuple sample is permutated, to further randomize the QAM symbols. As appropriate for the modulation order, 2, 4 or 6 bits of the permutated 6-tuple are applied to the data sequence. That is, in addition to randomizing the modulation symbols for a given code channel, each code channel will likely have unique QAM symbols at any given symbol time.

REFERENCES:
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patent: 6347385 (2002-02-01), Cui et al.
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patent: 6389138 (2002-05-01), Li et al.
patent: 6427214 (2002-07-01), Li et al.

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