Patent ID: 8681901

Claim:
A method for detecting a signal in a Spatial Multiplexing Multiple Input Multiple Output (SM-MIMO) communication system, the method comprising: QR decomposing a reception signal vector and generating the QR decomposed reception signal vector as a transformed reception signal vector; substituting all of transmittable candidate symbols for a transmission symbol corresponding to a first detection order among transmission symbols included in a transmission symbol vector and sequentially removing interference in the transformed reception signal vector; detecting candidate symbols of transmission symbols corresponding to at least one second detection order different than the first detection order from the interference-removed transformed reception signal vector, combining the detected candidate symbols, and detecting candidate symbol vectors; generating a plurality of substitution candidate symbols by using the detected candidate symbol vectors; re-defining multiple detection orders of the transmission symbol vector in such a manner that the generated substitution candidate symbols are first detected, and updating the transformed reception signal vector according to the re-defined detection orders; substituting the generated substitution candidate symbols for the transmission symbol corresponding to the first detection order in each of the re-defined detection orders, and sequentially removing interference from the updated transformed reception signal vector; and calculating LLR (Log-Likelihood Ratio) values of bits included in the transmission symbols by using the detected candidate symbol vectors.