METHOD AND APPARATUS FOR INTER-CARRIER INTERFERENCE MITIGATION IN PHASE NOISE LIMITED WIRELSS COMMUNICTION SYSTEMS

摘要

In a wireless, OFDM system, phase noise may be mitigated through the use of an interleaver that is designed to distribute coded block bits across subcarriers of multiple OFDM symbols. Doing so decreases the non-stationary properties of the noise. Such an interleaver may be a rectangular interleaver that maps each block to a different subcarrier to create frequency diversity and to a different OFDM symbol, to create time diversity. One exemplary method of interleaving the symbols is to place a first symbol at row X and column Y of the interleaver. The next symbol is placed in row X+1 and column Y+1. The result of such an interleaving process is a great reduction in the block error rate.

主权项

1. An interleaver in an OFDM system comprising:
a processor arranged to determine a number of data subcarriers in an OFDM symbol, wherein;
the processor is further arranged to determine a number of symbols in a coded block, wherein each coded block comprises a plurality of symbols with a coded block length;the processor is further arranged to map encoded blocks such that each successive symbol is written to a different row and a different column from an immediately preceding symbol; and wherein,the interleaver utilizes a number of rows equal to the number of data subcarriers and a number of columns equal to the coded block length.