PAR and out-of-band radiation reduction in code multiplex...

Details PAR and out-of-band radiation reduction in code multiplex... PAR and out-of-band radiation reduction in code multiplex...

2006-10-24

2006-10-24

Fan, Chieh M. (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

Reexamination Certificate

active

07126980

ABSTRACT:
In an apparatus for generating a transmit sequence comprising information from a plurality of information channels, a first means serves for generating a plurality of different candidate channel sequences from information of a first information channel of the plurality of information channels using a first code sequence associated with the first information channel, wherein each candidate channel sequence carries the same information as the information of the first information channel. A second means is provided to provide at least one candidate channel sequence for a second information channel from the plurality of information channels using a second code sequence associated with the second information channel and differing from the first code sequence. To receive an optimum transmit sequence resulting in a minimum out-of-band radiation combined sequences are examined, wherein each combined sequence may be obtained by a combination of at least one candidate channel sequence from each information channel. After this either the combined sequence is selected resulting in a minimum out-of-band radiation or the optimum candidate channel sequences are selected from the individual information channels, which together result in the optimum combined sequence causing a minimum out-of-band radiation. Therefore it is possible to reduce peak values e.g. occurring in the code multiplex modulation concept in the transmit sequence distortion-free.

REFERENCES:
patent: 6067313 (2000-05-01), Cafarella et al.
patent: 903 871 (1999-03-01), None
patent: 10 12 6309 (1998-05-01), None
Van Eetvelt, P., GH. Wade, and M. Tomlinson; Peak to Average Power Reduction for OFDM Schemes by Selecting Scrambling; Oct. 1996, Electronics Letters.

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