System and method for scrambling using a bit scrambler and a phase scrambler

摘要

A system and method that demodulates the phase characteristic of a carrier signal are described. The scrambling of the phase characteristic of each carrier signal includes associating a value with each carrier signal and computing a phase shift for each carrier signal based on the value associated with that carrier signal. The value is determined independently of any input bit value carried by that carrier signal. The phase shift computed for each carrier signal is combined with the phase characteristic of that carrier signal so as to substantially scramble the phase characteristic of the carrier signals. Bits of an input signal are modulated onto the carrier signals having the substantially scrambled phase characteristic to produce a transmission signal with a reduced PAR.

主权项

1. A method, in a multicarrier communications transceiver comprising a bit scrambler followed by a phase scrambler, comprising:
scrambling, using the bit scrambler, a plurality of input bits to generate a plurality of scrambled output bits, wherein at least one scrambled output bit is different than a corresponding input bit; rotating, using the phase scrambler to reduce a peak-to-average power (PAR) ratio of a transmitted multicarrier signal, at least one constellation point associated with the at least one scrambled output bit, wherein the rotating is equal to 0 or π; transmitting the at least one scrambled output bit on a first carrier of the transmitted multicarrier signal; and transmitting the same at least one scrambled output bit on a second carrier of the transmitted multicarrier signal.