Reducing peak-to-average variance of a composite transmitted sig

Details Reducing peak-to-average variance of a composite transmitted sig Reducing peak-to-average variance of a composite transmitted sig

1994-10-31

1998-11-17

Chin, Wellington

Pulse or digital communications

Transmitters

Antinoise or distortion

375298, 375302, 370343, H04L 2503, H04L 2736, H04J 900, H03C 302

Patent

active

058387323

ABSTRACT:
A technique which enables the use of a low cost linear power amplifier to generate a wideband composite signal, such as in cellular mobile telephone (CMT), personal communication system (PCS), or other multi-channel wireless systems. A composite signal is generated by a wideband digital combiner as a frequency multiplexed combination of many narrowband modulated digital carrier signals. The technique involves introducing predetermined phase shifts into each of the digital channel signals after a baseband modulation step. The wideband composite signal thus exhibits a reduced peak-to-average signal power, despite the fact that the phases of the digital carrier signals cannot be directly controlled. This permits the use of a power amplifier, which may have a much smaller peak-to-average rating.

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