Methods and apparatus for transmitting data over a CDMA network

Details Methods and apparatus for transmitting data over a CDMA network Methods and apparatus for transmitting data over a CDMA network

2006-08-01

2006-08-01

Ha, Dac V. (Department: 2634)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S141000, C375S146000

Reexamination Certificate

active

07085307

ABSTRACT:
The use of cyclic prefixes with OFDM transmissions is known. Typically the prefix length is chosen to be at least as long as the duration of significant multipath in the transmission channel. However, OFDM has disadvantages in terms of DSP load and transmitter power amplifier specifications. The use of a cyclic prefix with periodic CDMA codes has been found to yield equivalent performance in terms of orthogonality in a dispersive channel and yet overcomes the disadvantages of cyclicly prefixed OFDM transmissions. Examples are given of Walsh Hadamard binary periodic codes.

REFERENCES:
patent: 6377632 (2002-04-01), Paulraj et al.
patent: 6654408 (2003-11-01), Kadous et al.
patent: 6731668 (2004-05-01), Ketchum
patent: 6882619 (2005-04-01), Gerakoulis

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