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It is well known that in practice, MIMO channels usually exhibit strong line-of-sight (LoS) components. However, common codebook designs in precoded MIMO rely heavily on the assumption of i.i.d Rayleigh fading. Therefore, designing practical unitary precoders that are suited for realistic channel condition (such as Rician MIMO channel) becomes an interesting topic to investigate. In this paper, we...
In this paper, a novel precoder design method is proposed for maximizing MIMO capacity. Specifically, under equal power allocation, we employ the trellis exploration algorithm to design the precoding matrix such that the condition number of the resulting effective channel matrix is minimized. Since the trellis exploration algorithm operates on a finite set of phases, the polyphase precoder is first...
In this paper, we propose a multi-layer preceding scheme to reduce PAPR in MIMO-OFDM systems. Specifically, an outer-layer polyphase preceding matrix P is custom designed using the trellis exploration algorithm that was previously applied to the design of spreading sequences for CDMA systems. The algorithm determines the P matrix that results in the minimum aperiodic autocorrelation (and therefore...
In this letter, we present a novel approach to determine limited feedback-based unitary precoder for maximizing single user (SU)-MIMO capacity. Specifically, a polyphase unitary precoding matrix is custom designed via the trellis exploration algorithm employing system capacity as the metric to maximize. Since the trellis exploration algorithm operates on a finite set of phases, information regarding...
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