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In this paper, we study simultaneous wireless information and power transfer (SWIPT) in a multi- user interference single-input single-output (SISO) system. We first solve the ergodic rate optimization problem theoretically and derive the PS scheme and the TS scheme to obtain the optimal strategy of getting maximum ergodic capacity while harvesting sufficient energy to ensure receiver circuit working...
Hybrid Automatic Repeat reQuest (HARQ) techniques are largely used in the context of wireless communications systems especially in the last few years, being employed in the latest cellular systems, including the Long Term Evolution (LTE) standard. Such schemes have been widely studied in literature; however, in this paper we are interested in applying the results of Polyanskiy-Poor-Verdù on the finite...
In this paper, a rate allocation policy is proposed for truncated transmission of spinal codes based on imperfect feedback over block fading channels. By constructing and solving the throughput optimization problem, the optimized rate allocation policy is obtained under the constraint of limited transmission attempts and frame error probability. Both analysis and simulations show that the rate-allocated...
In this paper, we investigate how to adapt a composite decode-forward (DF) two-way relaying scheme to fading links. We develop a maximum entropy (ME) quantization algorithm to feed back the link magnitudes such that the transmitters are able to perform link adaptation. The ME algorithm outperforms that of Lloyd-Max in mid and high range SNR, and performs comparably at low SNR. With just one bit of...
In this paper, we propose a joint channel impulse response (CIR), phase noise (PHN) estimation and decoding algorithm for time-selective flat Rayleigh fading channels. Building on the first-order autoregressive model approximation for both the time evolutions of CIR and PHN, a factor graph of the joint a posteriori probability function is constructed and the sum-product algorithm is applied to derive...
Classical Turbo code suffers from high error floor due to its small minimum Hamming distance (MHD). Newly-proposed 3D-Turbo code can effectively increase the MHD and achieve a lower error floor by adding a rate-1 post encoder, through which part of the parity bits from the classical Turbo encoder are further encoded. In this paper, a novel bit-interleaved coded modulation (BICM) system is proposed...
An index coding scheme in which the source (transmitter) transmits symbols over a wireless fading channel is considered. Index codes with the transmitter using minimum number of transmissions are known as optimal index codes. Different optimal index codes give different performances in terms of probability of error in a fading environment and this also varies from receiver to receiver. In this paper...
This paper focuses on the beneficial effects brought by the presence of multiple receivers to a slotted Aloha scheme. Starting from an analytical angle, we review and compare some recent results that characterize the throughput of such systems under different channel models, based on the assumption that incoming powers at receivers follow an i.i.d. distribution. While practical in some scenarios,...
This paper investigates the outage behavior of transmitting correlated binary sources with arbitrary code rate over quasi-static Rayleigh fading multiple access channel (MAC). The sufficient condition for lossless communication with arbitrary code rate is obtained by assuming separate source and channel coding, which indicates the two rate regions specified by the Slepian-Wolf theorem and the MAC...
For digital terrestrial television broadcasting (DT-TB) systems, orthogonal frequency division multiplexing (OFDM) technique is considered to be an effective method to combat the frequency selective channel cause by multi-path effect. In the single frequency network (SFN) scenario, Alamouti space frequency block coding (SFBC) is introduced to provide spatial diversity gain and improve the link stability...
The performance of lattice codes in the additive white Gaussian noise (AWGN) channel has attracted much attention lately, however, their performance under ergodic fading channels has been relatively unexplored. We show that lattice coding and decoding achieve the capacity of the ergodic point-to-point and multiple-access channels (MAC). Additionally, a low-complexity scheme is proposed for the ergodic...
In this paper, an optimal power allocation scheme for a simple lossy-forwarding relaying system is provided. Here, we extend our previous work of optimal power allocation of Slepian-Wolf relay system with constant source-relay error probability, to such that block Rayleigh fading is assumed for all transmission channel and lossy transmission is assumed in source-relay channel. Since data sequences...
Nonergodic fading is a useful model for various wireless communication channels in both indoor and outdoor environments. With this model, a codeword is divided into multiple blocks such that fading is constant within a block and independent across blocks. Building on Poltyrev's work on infinite lattice constellations for the Gaussian channel, we derive a Poltyrev outage limit for lattice constellations...
The coherence time of a wireless channel is often smaller than the delay with which channel state information is available at transmitters. In this paper, we aim to find the most important subset of the channel state information that transmitters need to learn with delay. We characterize the capacity region of the two-user interference channel with local delayed channel state information at transmitters...
This paper presents a polar coding scheme for fading wiretap channels that achieves reliability as well as security without the knowledge of instantaneous channel state information at the transmitter. Specifically, a block fading model is considered for the wiretap channel that consists of a transmitter, a receiver, and an eavesdropper; and only the information regarding the statistics (i.e., distribution)...
Consider several single-antenna transmitters that wish to simultaneously communicate with a multiple-antenna receiver. Recent work has proposed the integer-forcing linear receiver architecture as an alternative to conventional linear receivers. The key idea is to first use linear equalization to obtain an integer-valued effective channel, then employ single-user decoders to recover integer-linear...
A well-known technique in assessing probabilities of rare events (used, e.g., in the sphere-packing bound), is that of finding a reference measure under which the event of interest has probability of order one and estimating the probability in question using the Kullback-Leibler divergence (KLD). A recent method has been proposed [2], that can be viewed as an extension of this idea in which the probability...
We address outage analysis for a two-user parallel Gaussian interference channel consisting of two sub-channels. Each sub-channel is modelled by a two-user Gaussian interference channel with quasi-static and flat fading. Both users employ single-layer Gaussian codebooks and maintain a statistical correlation ρ between the signals transmitted over the underlying sub-channels. If the receivers treat...
Spatially-Coupled LDPC (SC-LDPC) codes have been recently shown to be very efficient for transmissions over nonergodic channels, in particular over block-fading channels [1]. In fact, it is possible to design a SC-LDPC code with any given code diversity [2]. In this work, we investigate the performance of SC-LDPC codes over block-fading channels, assuming a mismatch (or offset) between the first bit...
In this paper, the problem of lossy source coding with side information at the decoder is considered when the dependency between the source and the side information (SI) is quasi-stationary and unknown to the encoder. This dependency is modeled using a (virtual) block fading channel. In order to help the decoder estimate the dependency, a part of the transmitted source in each block is coded at high...
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