An Ordering Interpolation-based QR Decomposition Algorithm for V-BLAST OFDM Systems with Two Transmit Antennas

Recently, the interpolation-based QR decomposition has been proposed in order to efficiently reduce the complexity of V-BLAST OFDM signal detection algorithm. However, it can´t be directly applied to the case of different ordered matrices, which is common in most of the detection algorithms. To solve this problem, a low complexity ordering interpolation-based QR decomposition algorithm for V-BLAST OFDM systems with two transmit antennas is presented. The proposed algorithm combines the group ordering with interpolation-based QR decomposition by introducing the relationship of QR decomposition between different column ordered matrices. The algorithm can be regarded as a pre-processing method for those V-BLAST OFDM signal detection methods which apply successive interference cancellation or sphere decoding algorithm. Compared with the directly extended method of interpolation-based QR decomposition, the proposed algorithm achieves more saved cost with the increasing of the number of receive antennas, which makes it more suitable for the design of base station receivers