This paper is dedicated to the study of HARQ protocols under a secrecy constraint. An encoder sends information to a legitimate decoder while keeping it secret from the eavesdropper. Our objective is to provide a coding scheme that satisfies both reliability and confidentiality conditions. This problem has been investigated in the literature using a coding scheme that involves a unique secrecy ...

In this paper, we evaluate by computer simulations the throughput performance of rate compatible punctured turbo coded hybrid ARQ (RCPT HARQ) for direct sequence code division multiple access (DS-CDMA) with antenna diversity reception and rake combining in a frequency selective Rayleigh fading channel. The impact of a range of transmission system parameters and propagation parameters (viz.: the...

Automatic Repeat-reQuest (ARQ) schemes are extensively used in communication systems and computer networks to achieve reliable transmission. Using space-time codes (STCs) with multiple input multiple output (MIMO) or multiple input single output (MISO) systems is an effective way to combat multipath fading, which is the most severe impairment for wireless communication systems. STCs are designe...

In this paper, we propose a new handover algorithm to guarantee handover quality in 4G mobile systems. The proposed algorithm limits the handover interruption time by improving the HARQ retransmission latency of the first packet transmitted from new serving cell. Through the simulations, we proved that our algorithm meets the requirement of handover interruption time for TCP services with high ...

In most communication system whether wired or wireless convolutional encoders are used and AWGN introduces errors during transmission. Various error correcting and controlling mechanisms are present. In this paper all mechanisms are studied and best mechanism on the basis of accuracy, complexity and power consumption is selected. There should be trade off between complexity of hardware and powe...

This report serves as an addendum to [1], and presents the PDP analysis of dual EH links with zero size energy buffers, for ARQ and HARQ-CC protocols. In addition to this, expressions for the transition probabilities of the discrete-time Markov chain (DTMC) model of the dual and mono energy harvesting links are provided [1]. The notations used here assumes the same meaning as defined in [1].

1 Lab-STICC, Institut Telecom, Telecom Bretagne, UMR CNRS 3192 Lab-STICC, Technopôle Brest-Iroise, CS 83818 29238 Brest Cedex 3, France 2TELECOM Bretagne institution, Université européenne de Bretagne (UEB), France 3Orange Labs, 38-40 rue du generale-Leclerc, 92792 Issy Moulineaux Cedex 9, France 4Communication Systems Department, Institut National des Postes et Télécommunications (INPT), Madin...

-An unequal error protection (UEP) optimization strategy is presented for binary regular LDPC coded modulation with high order constellation, such as MQAM. In contrast to conventional mapping method, this approach gives a considerable performance improvement with slight complexity increase. Furthermore, we extend this UEP method to Hybrid ARQ (HARQ) transmission with variable retransmission len...

In this paper, we introduce a lab trial that is conducted to study the feasibility of ultra-low latency for 5G. Using a novel frame structure and signaling procedure, a stabilized 1.5 ms hybrid automatic repeat request (HARQ) round trip time (RTT) is observed in lab trial as predicted in theory. The achieved round trip time is around 5 times shorter compared with what is supported by LTE-Advanc...