Multirate, constant envelope, constant bandwidth,...

Details Multirate, constant envelope, constant bandwidth,... Multirate, constant envelope, constant bandwidth,...

2008-01-15

2008-01-15

Harper, Kevin C. (Department: 2616)

Multiplex communications

Generalized orthogonal or special mathematical techniques

C370S208000, C375S260000

Reexamination Certificate

active

07319658

ABSTRACT:
A modulation channelization, demodulation and error-control system based on orthogonal bipolar spreading vectors is provided that permits a variable information rate to be transmitted without inducing envelope fluctuations and which permits multiple access without requiring the transmitter amplifier to support the combined information rate of all users. The modulation system uses the Hadamard matrix vectors to form communication channels. The information rate on any channel may be doubled by using half the vector length to transmit information. The vector that is not orthogonal-in-the-half to the rate-doubled vector is deactivated. Similarly, higher information rates may be provided through truncation of the transmission vector and the elimination of the resultant non-orthogonal vectors. The system provides biorthogonal coding in addition to multirate communication. A multi-channel receiver including a Fast Hadamard Transform structure comprised of controllable modified logic cells for performing the multi-rate communication of the present invention is illustrated.

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No J-S et al., “Performance Analysis of CDMA Systems by Using Biorthogonal Codes”, Asia Pacific Conference on Communications, vol. 1, 1995, pp. 326-330.

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