Complex-valued QR decomposition implementation for MIMO receivers

Multiple input multiple output (MIMO) transmission is an emerging technique targeted at 3G long term evolution (LTE) systems. One vital baseband function in MIMO receivers is QR decomposition of the channel matrix. In this paper, a processor based complex-valued QR decomposition is presented. The processor is enhanced with complex arithmetic and inverse square root function units. The proposed processor fits well with the real-time requirements of the MIMO receiver. The computing power is tailored for typical MIMO systems. Due to the generality of the applied computing resources it can also be used for other tasks. Also, the presented principles can be applied on any customizable processor architectures to accelerate QR decomposition.