The problem of network multiple-input multipleoutput precoding under distributed channel state information is a notoriously challenging question, for which optimal solutions with reasonable complexity remain elusive. In this context, we assess the value of hierarchical information exchange, whereby an order is established among the transmitters (TXs) in such a way that a given TX has access not...

The concatenated system of binary phase precoding and turbo codes is proposed in this paper. Its performance is presented by using an analysis method. The upper bound of constituent encoders (5,7) and (23,35) with constraint lengths of 3 and 5 respectively, are computed by varying both of the small information block size and spiral curve constants (coding rate 1⁄2). Result shows that a signific...

Because of the large numbers of feedback in the multiple input & multiple output (MIMO) multi-carrier system, the precoding based on full channel state information is difficult to be applied in practical. In order to significantly reduce the overhead of the feedback link, a compressed sensing precoding method with limited feedback in MIMO multi-carrier system is proposed in this paper. First, t...

Out-of-band (OOB) power emission is a conventional issue in orthogonal frequency division multiplexing (OFDM) system. The spectral leakage results in interference to licensed users (LU) in OFDM-based cognitive radio (CR) system. In this article, an adaptive precoding scheme based on the adaptive orthogonal projection matrix is proposed for OOB power suppression. Low complexity is the main featu...

This paper proposes a simplified QR-based selection criterion for the efficient optimization of multiple-input multiple-output (MIMO) precoding in a limited feedback system. The proposed selection criterion is developed which determines the precoder yielding the maximum of minimum diagonal entries of the upper triangular matrix of the QR-decomposition on the MIMO channel. Performance evaluation...

Linear Time Varying Precoder Applied to an ISI Channel Nader Sheikholeslami and Peter Kabal Department of Electrical Engineering McGill University, Montreal, Quebec, Canada [email protected] [email protected] Abstract A linear time varying precoding structure for data transmission over ISI channels is investigated. This precoding scheme is capable of stabilizing the inverse channel lter witho...

In this paper, a proposed wirelesstransmission model by concatenation of turbo code and precoding of Spiral curve and Dimension Partitioning techniques on QPSK signal through multipath fading channel is introduced. It is a novel method to decrease ISI effect in wireless communications. Simulation results show that Spiral curve precoding with turbo code achieves the best gain at high SNR compare...

In downlink multiuser multiple-input multiple-output (MIMO) systems, block diagonalization (BD) is a practical linear precoding scheme which achieves the same degrees of freedom (DoF) as the optimal linear/nonlinear precoding schemes. However, its sum-rate performance is rather poor in the practical SNR regime due to the transmit power boost problem. In this paper, we propose an improved linear...

Formobile users without antenna arrays, transmission diversity can be achieved with cooperative spacetime encoded transmissions. In this paper, a new precoding frame-based scheme with packet-wise encoding is proposed. This precoding is based on the addition of a cyclic prefix, which is overhead, so we put more information in it by implementing this cyclic prefix as a training sequence. This sch...

Linear index coding can be formulated as an interference alignment problem, in which precoding vectors of the minimum possible length are to be assigned to the messages in such a way that the precoding vector of a demand (at some receiver) is independent of the space of the interference (non sideinformation) precoding vectors. An index code has rate 1 l if the assigned vectors are of length l. ...