US 6,445,747 B1 · Method and apparatus to reduce peak to average power ratio in multi-carrier modulation

Abstract

A system and method to reduce a ratio between a peak signal power and an average power (PAPR) in a multi-tone communication system. The system includes an encoder configured to receive a plurality of input bits and to generate a plurality of coded symbols based on the plurality of input bits, and a phase shift calculator configured to calculate a plurality of phase shift values for the coded symbols that minimizes the peak to average power ratio. The system further includes an encoding phase shifter coupled to the encoder and the phase shift calculator, configured to receive the phase shift values from the phase shift calculator and configured to phase shift the plurality of coded symbols to generate a plurality of phase shifted symbols.

Claims17

Dependent claims

A method to reduce a ratio between a peak signal power and an average power (PAPR) in a multi-tone communication system, comprising:

receiving a plurality of blocks of bits of information;
generating a plurality of codewords based on the plurality of blocks of bits, each codeword including an N number of digital multi-tone symbols, wherein each of the digital multi-tone symbols in each codeword is designated as an i-th coordinate symbol starting from a 0-th coordinate symbol to a (N−1)-th coordinate symbol and N is a positive integer;
calculating phase shift values for each of the i-th coordinate symbols in order to minimize the PAPR;
and
phase shifting the digital multi-tone symbols by the phase shift values, to thereby reduce the PAPR.

2 more elements

A multi-tone communication system which minimizes its peak to average power ratio (PAPR), the system comprising:

a transmitter configured to transmit a communication signal, the transmitter including:
an encoder configured to receive a plurality of input bits and to generate a plurality of coded symbols based on the plurality of input bits whereby an N number of the coded symbols are grouped as a code word, wherein N is a positive integer and each of the coded symbols in each codeword is designated as an i-th coordinate symbol starting from a 0-th coordinate symbol to a (N−1)-th coordinate symbol;
a phase shift calculator configured to calculate phase shift values for each of the i-th coordinate symbols in order to minimize the PAPR;
and
an encoding phase shifter coupled to the encoder and the phase shift calculator and configured to receive the phase shift values from the phase shift calculator and generate a plurality of phase shifted symbols based on the coded symbols and the phase shift values;
and
a receiver configured to receive and decode the transmitted signal.

4 more elements

Dependencies are inferred from the claim text.

Method and apparatus to reduce peak to average power ratio in multi-carrier modulation

Life of this patent

Method and apparatus to reduce peak to average power ratio in multi-carrier modulation

Life of this patent

Abstract

Claims17