Channel capacity maximization in a distorted 2x2 LOS MIMO link

This paper presents a novel channel capacity maximization method for a distorted 2×2 line-of-sight (LOS) multiple-input multiple-output (MIMO) link. A LOS MIMO link may be distorted by the influence of environmental factors such that the channel capacity of the LOS MIMO link may be degraded. By using the proposed method, the channel capacity of a distorted 2×2 LOS MIMO link can be the same as that of the ideal 2×2 LOS MIMO link. The proposed method employs an additional receiver antenna to maximize the channel capacity. In contrast to a 3×2 LOS MIMO link, a receiver circuit for a third receiving antenna is not necessary. Hence, the receiver for the proposed method is much simpler than that for a 3×2 LOS MIMO link. We determine the optimal position of the additional receiver antenna analytically. Simulation results show that the channel capacity can approach the ideal using the proposed method.