Precoding [3] is an attractive strategy when transmitting over channels which suffer from additive noise and an additional interference term which is already known at the transmitter side. For example, Tomlinson-Harashima precoding, initially introduced for intersymbol-interference channels, has been extended to the equalization of MIMO channels such as multiple antenna systems [3]. Key point i...

This paper presents a novel precoding method for BPSK signals through multipath fading channel. It is named as “mixed phase-precoding method”. This technique is developed mixing on the principle of spiral curve phase precoding and with a dimension partitioning technique. In order to apply this method for applications with turbo code, a specific detector is also proposed. Simulation results show...

In this paper we discuss the application of Tomlinson-Harashima-type precoding to point-to-multipoint transmission scenarios. These include the CDMA downlink from a central transmitter (base station) to distributed, decentralized receivers (mobile terminals), as well as transmission from a satellite to multiple receiving earth stations. At the expense of only a very moderate increase in signal ...

As a key enabling technology for 5G wireless, millimeter wave (mmWave) communication motivates the utilization of large-scale antenna arrays for achieving highly directional beamforming. However, the high cost and power consumption of RF chains stands in the way of adoption of the optimal fullydigital precoding in large-array systems. To reduce the number of RF chains while still maintaining th...

Frequency nulling spectral precoding is an approach that suppresses the out-of-band emission in OFDM systems. In this paper, we discuss the transmitter architecture of the spectrally precoded OFDM systems. We design a novel precoder that matches the practical implementation of the OFDM modulator. We show that spectral precoding can relax the analog low pass filtering requirements of the OFDM sy...

Precoding techniques can be used in multiple input multiple output (MIMO) system to assign resources such as power and information optimally. This paper is concerned with limited feedback in precoded orthogonal space time block code (OSTBC) systems, which is a precoding technique for incomplete channel information response. The conventional approach to design the precoding codebook is based on ...

In this paper, we propose two subspace-projection-based precoding schemes, namely, full-projection (FP)and partial-projection (PP)-based precoding, for a cognitive radio multiple-input multiple-output (CR-MIMO) network to mitigate its interference to a primary time-division-duplexing (TDD) system. The proposed precoding schemes are capable of estimating interference channels between CR and prim...

In this paper, we propose and experimentally demonstrate a channel-independent multi-band orthogonal circulant matrix transform (MB-OCT) precoding, to efficiently combat the severe frequency-selective fading of visible light communications (VLC). The proposed MB-OCT precoding exhibits an attractive ladder-like signal-to-noise-ratio (SNR) profile, thus can significantly reduce system BER by appl...

Low-complexity precoding algorithms are proposed in this work to reduce the computational complexity and improve the performance of regularized block diagonalization (RBD) based precoding schemes for large multi-user MIMO (MUMIMO) systems. The proposed algorithms are based on a channel inversion technique, QR decompositions , and lattice reductions to decouple the MU-MIMO channel into equivalen...

| Precoding at the transmitter side is a practicable method for transmission over intersymbol interference channels. In contrast to decision{feedback equalization no error propagation occurs and coded modulation can be applied as for the intersymbol interference free channel. In this paper, Tomlinson{Harashima precoding and exible preco-ding are analyzed and compared. The dualities and diie-ren...