A configurable distributed systolic array for QR decomposition in MIMO-OFDM systems

Abstract

Due to the growing demand of transmission capacity of the wireless communication system, multiple-input multiple-output orthogonal frequency division multiplexing requires more and more antennas and a large number of sub-carriers. Thus, the QR decomposition becomes one of the computational bottlenecks in the QR-based MIMO detection because of calculating latency of many sub-carriers and compatible structure for different antennas. The proposed configurable distributed systolic array structure uses coordinate rotation digital computer computation in the boundary and internal cells of systolic array, and distributes the QR decomposition of different sub-carriers into the different stages of the pipelining operation of CORDIC in systolic array. The structure has good scalability for antennas of different dimension, and the latency outperforms other works in the literature.