This paper presents a comparison between Eigen value decomposition (EVD) method and Givens rotation (GR) method for the quasi-orthogonal space-time block coded (QO-STBC) wireless communication systems, working under the multipath Rayleigh fading channels, under the condition of imperfect channel state information (CSI) at the receiver side, and also presents the multi-input and multi-output (MI...

This paper considers the implementation of Tomlinson-Harashima (TH) pre-coding for multiuser MIMO systems based on quantized channel state information (CSI) at the transmitter side. Compared with the results in, our scheme applies to more general system setting where the number of users in the system can be less than or equal to the number of transmit antennas. We also study the achievable aver...

Multiple Input Multiple Output (MIMO) has been remained in much importance in recent past because of high capacity gain over a single antenna system. In this article, analysis over the capacity of the MIMO channel systems with spatial channel has been considered when the channel state information (CSI) is considered imperfect or partial. The dynamic CSI model has also been tried consisting of c...

In this paper, we consider decode-and-forward (DF) relay beamforming with imperfect channel state information (CSI), cooperative artificial noise (AN) injection, and finitealphabet input in the presence of an user and J non-colluding eavesdroppers. The communication between the source and the user is aided by a multiple-input-multiple-output (MIMO) DF relay. We use the fact that a wiretap code ...

If properly designed, the use of a linear precoder can achieve the maximum coding gain and diversity order in bit-interleaved coded modulation with multiple-input multipleoutput systems. However, such maximum coding gain and diversity order are compromised under the practical scenario of having imperfect channel state information (CSI) at the receiver. To alleviate the impact of imperfect CSI o...

In this paper, we derive closed-form solution for the bit error rate of multi-inputmulti-output (MIMO) system with maximum ratio combining. We consider binary PSK modulation suffers from cochannel interference (CCI) and imperfect channel state information(CSI). We assume a propagation model wherein the desired and interfering signals undergo independent and identically distributed (i.i.d.) Rayl...

Multi-carrier CDMA technology is a very attractive multiple access technique for next generation wireless communication systems. It combines the advantages of both Orthogonal Frequency Division Multiplexing (OFDM) and Code Division Multiple Access (CDMA) for high data rate transmission. However, interference noise is considered as a major challenge for MC-CDMA systems and significantly affects ...

A water-filling (WF) method is one of the techniques to improve a performance of multiple-input multiple-output (MIMO) systems. However, the application of the WF method to multiple-hop MIMO relay systems (MMRSs) has not been discussed, especially in amplify-and-forward (AF) schemes. In this paper, the WF method for MMRSs with AF scheme is proposed and evaluated in both perfect and imperfect ch...

In a tactical communications scenario, the transmitter will only have an imperfect estimate of the temporally correlated mobile RF channel. Given imperfect channel state information (CSI), we address the optimal signal design problem. Using the cutoff rate metric, we determine: (a) the optimal allocation of power and bandwidth between information and training signals, (b) the optimal binary inp...