QR (quadrature rectangle) decomposition-based low-complexity MIMO (multi-input multi-output) detecting algorithm

The invention relates to a QR decomposition-based low-complexity MIMO detecting algorithm, which mainly comprises the following steps: according to a equivalent frequency domain channel matrix, calculating a corrected channel matrix, and performing QR decomposition to the corrected channel matrix to obtain a unitary matrix Q and an upper triangular matrix; performing conjugate transpose to the unitary matrix Q, multiplying the conjugate transpose matrix of the unitary matrix Q with vectors of the received signal, detecting layer by layer, and demodulating the transmitting symbol until all symbols are detected. The method aims to solve the problem that in the prior art, the system performance and the operation complexity cannot be considered at the same time. By changing the decomposed channel matrix that is the expanded channel matrix based on MMSE (minimum mean square error) QR algorithm to be the corrected channel matrix, the operation complexity of the MIMO detecting algorithm is greatly reduced, on the premise of ensuring the certain performance of the system.