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We describe a successive cancellation list CRC (Cyclic Redundancy Check)-aided decoder for polar codes over AWGN (Additive White Gaussian Noise) Channel, Fading Channel and Impulsive Noise Channel. Simulation results show the advantage of this decoding method over the original proposed by Arikan.
This paper focuses mainly on Bit Error Rate (BER), Signal to Noise Ratio and different Rayleigh channels. We have designed four Rayleigh channels. This paper describes the comparative analysis of different digital modulation techniques like BPSK, QPSK, 8PSK, 16PSK and 16QAM for four Rayleigh channels which are designed. We also compare the convolution coding with different code rates i.e. 1/2, 1/3...
In this paper, we investigate the performance of a distributed space-time coding based hybrid satellite- terrestrial cooperative network (DSTC-HSTCN), where both the satelliterelay and satellite-destination links undergo the Shadowed-Rician fading, whereas the relay-destination link follows the Rayleigh fading. In particular, we address the problem in a downlink distributed Alamouti coded satellite...
The wireless communication system frequency diversity can be exploited with the help of Space frequency coding. In order to gain maximum frequency diversity various environment criteria needs to be considered. This paper proposes a practical approach of Distributed Space Frequency Coding [DSFC] for non-identically distributed [i.n.d] fading environment. As the geographical location of nodes is different,...
Due to elevated data rate transmission, fading immunity and bandwidth efficient capability, OFDM comes out as a key technology in contemporary wireless communication systems. Additionally, to access error free transmission, diverse channel codes for instance Convolution Codes (CC), Reed Solomon (RS) and BCH codes are being used in the previous work. In this work, an OFDM based M-PSK wireless system...
Bit-Interleaved Coded Modulation with iterative decoding (BICM-ID) is a technique with combination of coding and high-order modulation. Its many outstanding merits such as it can advance the coding gain, suit the fading channel and separately design the encoding part and the modulation part, make it a very competitive technology in the new generation wireless transmission system. This paper analyzed...
In this paper, we propose a novel scheme coined opportunistic space-time coding (OSTC) to deal with the outdated channel state information (CSI) problem for opportunistic relay selection (ORS) systems. A pair of relays, instead of a single relay, is opportunistically selected in terms of the instantaneous CSIs. Alamouti scheme, a unique space-time code achieving both full-rate and full-diversity,...
This work investigates polar coding for block-fading channels. We show that polarization does occur at infinity for three types of channel multiplexers. Nevertheless, the polarization process is not unique, as it is shaped by the choice of the multiplexer. The fading-plane approach is used to study the outage behavior of polar coding at a fixed transmission rate. Two types of multiplexers are shown...
The finite-SNR Diversity-Multiplexing Tradeoff (DMT) problem is studied in the context of spectrum aggregation, where there exist multiple noncontiguous (discrete) spectrum segments each of which has its own power limit. Firstly, we give an optimal power allocation strategy to achieve the ergodic capacity under Rayleigh fading. Secondly, two different coding schemes, i.e., coding without across sub-channels...
This article analyses the Frame Error Rate (FER) performance with the Pairwise Error Probability (PEP) and presents a LDPC coding scheme for Relay Cooperative Communication (RCC) system. In this scheme, the Degree Distribution of excellent LDPC codes is considered and the LDPC check Matrix is divided into several sub-blocks with different mean column weight (MCW), then specific sub-blocks are transmitted...
Along with the channel capacity, the error exponent is one of the most important information-theoretic measures of reliability, as it sets ultimate bounds on the performance of communication systems employing codes of finite complexity. In this paper, we consider 2 × 2 Nakagami-m fading channels and determine the exact closed-form analytical expression for the random coding error exponent which provides...
We examine a radio transmission system based on spectrum pooling, whereby the spectrum is divided into subchannels, and some users are allowed privileged access to the most reliable unused subchannels. The performance of this system is evaluated by assuming that a powerful error-control code is used, and hence by computing the information outage probability. It is shown that choosing the best channel...
This paper considers the design of practical schemes that enable two terminals, namely a source and a destination, to agree on a secret key in the presence of an eavesdropper (wire-tapper). The channel model considered is a fast Rayleigh fading wiretap channel with the constraints of quadrature phase-shift-keyed source symbols and hard-decision destination quantization. It is assumed that there exists...
In this paper, assuming transmission with fixed rate and fixed power, we derive the average duration of capacity outage and non-outage events of selective decode-and-forward relaying with repetition coding over slow Rayleigh fading channels. Furthermore, we develop high signal-to-noise ratio (SNR) approximations for both durations which provide significant insight into the impact of various system...
The work is related to the use of error correction coding and adaptive equalization as an aid to Maximal Ratio Combining (MRC) in order to improve bit error rate(BER)s of received signals in wireless channels with fading characteristics. Several modulation schemes are used in the transmission in Gaussian, multipath Rayleigh and Rician fading channels. The work adopts a few error correction codes and...
Relay-assisted network coding (NC) has attracted recent interests in increasing the transmission reliability and network throughput. By encoding the received packets from different source nodes, a relay node assists destinations to recover their desired information by forwarding the network coded packets. Previous work commonly assumes reliable inter-node channels and that relays always encode all...
Cooperative diversity is a transmission technique, where multiple users pool their resources to form a virtual antenna array that obtain spatial diversity. We evaluate the performance of coded cooperation with multiple relays in Reyleigh fading channels. The closed-form expressions with multiple relays are derived in this work. Our numerical results show that the new coded cooperation method can achieve...
The design of beamformers using limited channel state feedback at the transmitter for multiple-input single-output (MISO) fading channels has been extensively studied in the literature. It has been established that the limited feedback of channel state can lead to significant capacity enhancement. In this paper, it is demonstrated that the use of channel output feedback in addition to limited channel...
In this paper, we propose a technique to improve the performance of Joint Channel and Network Coding (JCNC) scheme in Multiple Access Relay Channel (MARC). This technique is motivated by the observation that decoding quality is improved when channel output can be processed iteratively. Using different permutation patterns for different users, we enabled more scenarios that destination can apply iterative...
We analyze a wireless communication system in which channel coding is applied to both physical and upper layer. In this scenario, we study the splitting of redundancy between the coding schemes applied to the two layers. Considering a frequency-flat, slowly varying fading channel, we derive the optimum splitting value for a given signalling format. The theoretical analysis is validated by means of...
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