SELECTIVE HARQ COMBINING SCHEME FOR OFDM/OFDMA SYSTEMS

摘要

A method and apparatus for combining retransmitted hybrid automatic repeat-request (HARQ) messages at differentstages in an orthogonal frequency-division multiplexing (OFDM)/orthogonalfrequency-division multiple access (OFDMA) receiverare provided. The type of HARQ combiner used for a particular channel maydepend on a number of selection criteria including themodulation order of the transmission, the number of bits needed for thecombined signals, and the headroom in the HARQ buffer.For some embodiments, a combination of different types of HARQ combiners maybe designed into a receiver and selected on aper-channel basis. Proper selection of a HARQ combining scheme may reduce therequired HARQ buffer size and may provide anincreased combining gain when compared to conventional HARQ combiningtechniques.