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Ethio-Telecom, the sole telecom service provider in Ethiopia, is expanding its mobile network infrastructures to reach its target of over 100 million subscribers in the next few years. As a result of this expansion and with the introduction of new services a considerable amount of electronic information (eg. E-mail, Short Message Service (SMS), etc.) written in local languages is expected to be generated...
This paper addresses the problem of joint source and channel coding for 3-D video coding and transmission. Firstly, we formulate a packet-level joint texture and depth coding mode selection framework for error-resilient source coding using Lagrange multiplier. Then, we evolve to the more general formulation that jointly optimizes error-resilient source coding and channel coding for texture and depth...
Internet of Things (IoT) solutions are increasingly being deployed for smart applications. To provide good communication for the increasing number of smart applications, there is a need for low cost and long range Low Power Wide Area Network (LPWAN) technologies. LoRaWAN is an energy efficient and inexpensive LPWAN solution that is rapidly being adopted all around the world. However, LoRaWAN does...
In backscatter communications, ultra-low power devices signal by modulating the reflection of radio frequency signals emitted from an external source. Unlike conventional one-way communication, the backscatter channel experiences unique self-interference and spread Doppler clutter. Run-length limited (RLL) codes provide a method for spectrum shaping that requires no hardware changes to the communicating...
Cognitive radio technology aims to meet the demand for higher data rates in wireless communications by allowing secondary users to opportunistically locate and utilize otherwise under-utilized spectrum resources [1]. This paper focuses on the cases when a secondary user monitors the occupancy of frequency subbands by using a multiband spectrum sensing approach in which multiple frequency subbands...
For physical-layer authentication, the authentication tags are often sent concurrently with messages without much bandwidth expansion. In this paper, we present a channel coding approach for physical-layer authentication. The generation of authentication tags can be formulated as an encoding process for an ensemble of codes, where the shared key between Alice and Bob is considered as the input and...
This paper presents an optimal and secure communication of real time data over a CDMA based IP RAN network. In the process of data transmission, a new coding approach for security enhancement and quality improvement based on spectrum utilization and antenna coding is suggested. The traffic model is developed for image and audio data transmission over a wireless channel, having an interference of A...
Channel coding plays a vital role for the maintenance of quality and reliability in data delivery in a communication system. Practical applications of channel coding includes the area of deep space communication, satellite communication, wireless communication, data transmission etc. Convolution coding is one of large class among them. The main aim of this paper is to elucidate the main features of...
Physical layer network coding (PNC) with channel coding is a strategy that applies error correction at the relay nodes of a relay system to improve data communication reliability of the whole relay system. So far, channel coded PNC schemes have been studied for two-way relay systems, but have not been systematically proposed for general multiple-way relay systems. In this paper, joint channel coding...
In this paper, we propose a low latency fast Hadamard transform (FHT) based decoder for polar codes. We show that while this decoder can achieve the same performance as the popular successive cancellation (SC) decoder, it is superior to the SC decoder in terms of latency. The proposed FHT decoder can be applied directly to most short Polar codes, but requires a modest level of encoder modification...
In this paper we study blind recovery methods for identifying the parameters of a convolutional code from an intercepted bitstream. It is assumed that the interceptor has no prior knowledge about the encoder and the recorded bitstream is noisy. The goal is to obtain the following parameters of convolutional code (i) number of inputs (ii) number of outputs (iii) constraint length of the convolutional...
A competent and fast decoding method for a Rate 3/4 Trellis Coded Modulation (TCM) used in Digital Mobile Radio systems, is proposed in this paper. Digital Mobile Radio (DMR) is a standard for digital radio. European Telecommunication Standard Institute (ETSI) developed the specification for the Professional Mobile Radio (PMR) users. TCM is a bandwidth efficient modulation. In TCM, doubling of constellation...
Serial concatenated code (SCC) has drawn lots of attention by its outstanding performance in terms of reduced bit error rate (BER). It is considered that the encoding structure and decoding algorithm are the two crucial parameters for performance improvement of any code system. This paper introduces the modified structure of SCCC encoder design. The addition of a set of de-Multiplexer and multiplexer...
Undersea acoustic links are highly complex due to the various propagation effects like the spreading, multipath, intersymbol interference, fading, etc.. Orthogonal frequency division multiplexing is found to be a good choice to combat intersymbol interference. It enables simpler equalization as well. Coding can be used in conjunction with OFDM to achieve error correction, improved security as well...
In a video streaming application, quality of experience for a user can be affected by various factors. The video quality can be improved if the effective throughput can be increased at an acceptable packet loss rate and low latency. To reduce the packet loss rate over error-prone channels, a cross-layer error control scheme is developed for heterogeneous data transmission over wireless channels in...
Error probabilities of random codes for memoryless channels are considered in this paper. In the area of communication systems, admissible error probability is very small and it is sometimes more important to discuss the relative gap between the achievable error probability and its bound than to discuss the absolute gap. Scarlett et al. derived a good upper bound of a random coding union bound based...
Forward error correction techniques are commonly used for delay-sensitive video streaming applications. Streaming of compressed videos can usually withstand a certain level of packet loss, depending on the compression methods and error concealment techniques. In this paper, a QoS-driven optimization algorithm is proposed for the streaming of scalable videos using layer-aligned multipriority rateless...
This paper analyzes the block error rate (BLER) performance provided by a virtual MIMO scheme which implements a modified Alamouti Space-Frequency Block Code (SFBC) encoding-decoding algorithm using two fixed Decode &Forward relays that perform selective relaying, and single-antenna devices. It also analyzes the performance of the classical relay-based distributed Alamouti scheme with single-antenna...
This paper presents a novel algebraic framework of collaborative network channel coding scheme in a network with multiple-access relay channel. The proposed scheme helps reduce the computational complexity while enhancing energy efficiency of the wireless network. The devised scheme is intended for practical scenarios where channels exhibit various fading conditions over all the wireless links. We...
A scaling technique is proposed to maintain the decoding failure probability of Vector Symbol Decoding (VSD) with the increase in data rate. Specifically, the symbol size must be increased in the same ratio as the data rate. VSD is attractive since it allows for a very flexible scaling. This paper also presents a way to compute the optimal maximum number of syndromes to minimize the complexity of...
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