Method and apparatus for inter-carrier interference mitigation in phase noise limited wirelss communiction systems

A wireless transmitter for processing OFDM baseband signals comprising:

• an encoder configured to perform block encoding to generate block coded data including at least one coded block;
• a constellation mapper configured to perform constellation mapping on the block coded data in order to generate symbols;
• an interleaver configured to:
• determine a number of data subcarriers in an OFDM symbol;
• determine the number of symbols in each of the coded blocks, wherein each of the coded blocks comprises a plurality of the symbols with a particular coded block length;
• and
• map each of the coded blocks to memory such that each symbol of a particular coded block is written to a different row and a different column than the immediately preceding symbol of the same coded block, wherein the number of rows is equal to the number of data subcarriers and the number of columns is equal to the coded block length, and wherein the number of columns is selected from the group consisting of 112 and 168;
• output the written symbols of the coded blocks via a column-by-column basis, or a row-by-row basis, thereby generating interleaved symbols;
• a subcarrier mapper configured to perform subcarrier mapping on the interleaved symbols, thereby generating subcarrier mapped symbols;
• and
• a second processor configured to perform an Inverse Fast Fourier Transform on the subcarrier mapped symbols, thereby generating a time domain OFDM symbol that is transmitted using subsequent circuitry of the wireless transmitter.

A method of interleaving data in an OFDM transmitter comprising:

• determining, using the OFDM transmitter, a number of data subcarriers in an OFDM symbol;
• determining, using the OFDM transmitter, a number of symbols in at least one coded block, wherein each of the coded blocks comprises a plurality of symbols with a particular coded block length;
• creating, using the OFDM transmitter, an interleaver matrix in memory with a number of rows equal to the number of data subcarriers and a number of columns equal to the coded block length, wherein the number of columns is selected from the group consisting of 112 and 168;
• and
• mapping each of the coded blocks such that each successive symbol is written to a different row and a different column from the immediately preceding symbol in the interleaver matrix;
• outputting the written symbols of the coded blocks via a column-by-column basis, or a row-by-row basis, to at least one subsequent circuit of the OFDM transmitter.