Patent ID: 7783962

Claim:
An iterative decoding receiver for reducing complexity of a partial sphere decoding operation in a spatial multiplexing system, the iterative decoding receiver comprising: a reliability estimator for dividing symbols received through multiple antennas into sub-transmission symbols s 2 estimated to have an a priori probability of a transmission symbol that is higher than a first reference value and sub-transmission symbols s 1 estimated to have the a priori probability of the transmission symbol that is lower than the first reference value, in a quasi-optimum detection method; a demapper for receiving the sub-transmission symbols s 2 estimated, based on a detection reliability, to have the a priori probability of the transmission symbol that is higher than the first reference value from the reliability estimator, and generating soft values of the corresponding sub-transmission symbols; a maximum posteriori (MAP) detection-based partial soft input soft output (SISO) sphere decoder for SISO sphere decoding the sub-transmission symbols s 1 estimated to have the a priori probability of the transmission symbol that is lower than the first reference value; an adder for receiving the soft values of corresponding sub-transmission symbols and an extrinsic probability having a reliability increased to be higher than the first reference value by the MAP detection-based partial SISO sphere decoder, and adding the soft values and the extrinsic probability; a deinterleaver for receiving the extrinsic probability of encoded bits output from the adder, and deinterleaving interleaved bits to change an order of the interleave bits into an original bit order; an SISO decoder for decoding an output signal of the deinterleaver in a decoding algorithm; an interleaver for interleaving the extrinsic probability output from the SISO decoder, and generating a priori probabilities corresponding to transmission symbols; and an a priori probability divider for receiving the a priori probabilities corresponding to the transmission symbols from the interleaver, and alternately dividing transmission symbols into a set of sub-transmission symbols directly input to the adder and a set of sub-transmission symbols input to the MAP detection-based partial SISO sphere decoder based on the a priori probabilities.