Cyclic Path Switching for Lattice Reduction-aided Iterative Linear Receivers in Overloaded MIMO Systems

抄録

This paper proposes a technique called “Cyclic path switching (CPS)” to improve the transmission performance of iterative linear receivers assisted with the lattice reduction in overloaded MIMO channels. The proposed CPS applies different parameters to the LLL algorithm, one of algorithms for the lattice reduction, in order to prepare two paths in the iterative linear receivers. The CPS cyclically switches the paths in the iteration process of the receiver, which is expected to randomize error bits and to improve the decoding performance in the proposed receiver. The CPS enables the iterative receiver to attain a gain of about 0.5dB at the packet error rate (PER) of 10^-2in a 6×2 MIMO system with the 64 QAM, when the reception process is iterated 50 times, even though the CPS is implemented with little additional computational complexity.