DYNAMIC TONE GROUPING AND ENCODING FOR MULTI-CARRIER QUADRATURE AMPLITUDE MODULATION IN OFDM

摘要

wireless Orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing; OFDM) system at the transmitter by using a dynamically ton The proposed method of; (DTG dynamic tone grouping) group. First, the coding sequence and the interleaved bits are demultiplexed into a number of bit stream. Each bitstream, quadrature amplitude modulation (Quadrature Amplitude Modulation; QAM) QAM symbols are mapped into a sequence are grouped into groups of symbols that do not overlap. Then, unitary transformation is applied on the QAM symbols to generate a group of complex signals. Finally, the complex signal is based on tone mapping information so as to improve the link performance dynamically mapped to a sub-carrier group. The tone mapping information and the channel state information; such as (channel state information CSI), is derived from information associated with each of the OFDM subcarriers. OFDM carriers are grouped into subcarrier groups based on tone mapping information, a channel quality of each subcarrier group is balancing. In addition, the tone mapping information is efficiently encoded, the corresponding receiver / are transmitted from the receiver. ;