Blind precoding in line-of-sight MIMO channels

Paul Ferrand (1) , Sheng Yang (2)

1 Mathematical and Algorithmic Science Lab, France Research Center, Huawei Technologies
2 L2S - Laboratoire des signaux et systèmes

As we move towards densified networks for mobile access, with a larger number of access points, the need for high performance wireless backhaul increases drastically. In this respect, line-of-sight (LoS) multiple-input, multiple-output (MIMO) communication is a promising technique which can enable spatial diversity gains in such links, without increasing the allocated bandwith or overstepping requirements in radiated power. In this paper, we show that under practical conditions, the LoS MIMO channel matrix with dual-polarized (DP) antennas is block-circulant with circulant blocks (BCCB). This fact allows one to blindly diagonalize the channel, even in the absence of channel side-information (CSI) at the transmitter. In this case we show that appropriate precoding steps can greatly improve the performance of non-linear decoding in the LoS MIMO channel.

Domains: Mathematics [math]; Information Theory [math.IT]

Paul Ferrand, Sheng Yang. Blind precoding in line-of-sight MIMO channels. 17th IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC 2016), Jul 2016, Edinburgh, United Kingdom. ⟨10.1109/SPAWC.2016.7536764⟩. ⟨hal-01433727⟩