This paper investigates the joint precoding optimization for a relay-assisted multi-antenna downlink system. Aiming at multiuser sum capacity maximization, we first propose an iterative optimization algorithm which exploits quadratic programming approaches. Inspired by the results obtained from the iterative optimization algorithm, in order to further reduce the computational complexity, we the...

We consider vector perturbation (VP) precoding for a multiple antenna broadcast scenario with multiple noncooperative users. Under an instantaneous transmit power constraint, VP precoding requires the feedforward of a power normalization factor to the users. Simple quantization of the power normalization factor is shown to result in an error floor. To overcome this problem, we propose a new pre...

We combine error-control coding with linear precoding for flat-fading channels, as well as for wireless OFDM transmissions through frequency-selective fading channels. The performance is analyzed and compared with the standard coded system without precoding. By wedding linear precoding with conventional error-control coding, the diversity order becomes equal to the error-control code’s minimum ...

A transceiver structure for MIMO systems that comprises linear/non-linear precoding/decoding is optimized according to the MMSE criterion under the assumption that only long-term channel state information (or LT-CSI, i.e., fading channel and noise correlation matrices) is available at the transmitter. The structure generalizes different techniques known from the literature, such as BLAST, linea...

In this paper, we propose a new resource allocation algorithm based on linear precoding technique for multicast OFDM systems. Linear precoding technique applied to OFDM systems has already proved its ability to significantly increase the system throughput in a powerline communication (PLC) context. Simulations through PLC channels show that this algorithm outperforms the classical multicast met...

The Inter carrier interference (ICI) and inter block interference (IBI) are the two signal degradations on multi user orthogonal frequency division multiplexing (OFDM) communication system. In this paper, a noval methodology is proposed for the detection and reduction of ICI in received OFDM symbols. The vector precoding technique is proposed to reduce the ICI and more bandwidth efficient than ...

In this paper, we solve the sum mean-squared error (MSE)optimal 1-bit quantized precoding problem exactly for smallto-moderate sized multiuser multiple-input multiple-output (MU-MIMO) systems via branch and bound. To this end, we reformulate the original NP-hard precoding problem as a tree search and deploy a number of strategies that improve the pruning efficiency without sacrificing optimalit...

For the poor transmission reliability of data, this paper focuses on the precoding techniques of the multi-user MIMO system in the broadcast phase in, and the single-user MIMO and multi-user MIMO precoding techniques have been studied. In the multi-user MIMO system, BD-MMSE-VP coding algorithm is proposed to improve the BER performance of the system by using the MMSE criterion to optimize the p...

Long term evolution (LTE) standard for uplink transmission is based on single carrier frequency division multiple access (SC-FDMA) to maintain low peak-to-average power ratio (PAPR), which is very valuable for the practical handset design. Recently the usage of codebookbased precoding is thoroughly discussed for the LTE-Advanced (LTE-A) uplink. Among the various precoding schemes, equal gain tr...

Filterbank precoding in the intersymbol interference (ISI) mitigation has recently attracted much attention. Two main areas of such research have been explored. One of them is on filterbank precoding when the ISI channel is known to both the transmitter and the receiver, while the other is on filterbank precoding when the ISI channel is not known to the transmitter or the receiver. This paper i...