The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this work, Automatic-Repeat-Request (ARQ) and Maximal Ratio Combination (MRC), have been jointly exploited to enhance the confidentiality of wireless services requested by a legitimate user (Bob) against an eavesdropper (Eve). The obtained security performance is analyzed using Packet Error Rate (PER), where the exact PER gap between Bob and Eve is determined. PER is proposed as a new practical...
In this work, we propose the construction of turbo codes for high rate transmission over block-fading channels. These codes are suitable for modern standards such as the 3GPP-LTE, in which high data rates are required. Our designs are based on channel multiplexing schemes initially developed for block fading channels, namely horizontal multiplexing and h-n-diagonal multiplexing. However, to attain...
The performance of multilevel linear block codes is evaluated on Rayleigh fading channel, where the frames are independent from each other and consists of fading coefficients which are constant in a particular frame. Linear Block Codes perform up to mark in detecting error and correction problems. If this ability of error detection and correction of the linear block codes is used in a multilevel environment...
In this paper, we study optimal resource allocation strategies for simultaneous information and power transfer (SWIPT) focusing on the system energy efficiency. We consider two-user multiple access channels in which energy harvesting (EH) and information decoding (ID) nodes are spatially separated. We formulate optimization problems that maximize system energy efficiency while taking harvested energy...
Communication systems need for regeneration of consistent information by controlling errors in a noisy environment. This is accomplished by incorporating suitable forward error correcting coding techniques into the system. In this context, Turbo Code (TC) is regarded as one of the high-performance forward error correcting codes whose BER performances tends to the “Shannon limit”. An advanced form...
In this work, we propose the construction of distributed turbo network codes that have close-to-outage probability performance over the quasi-static fading multiple-access relay (MARC) channel, where two users share a common relay to transmit their information to the destination. Our designs are based on full-diversity channel multiplexing schemes initially developed for point-to-point block fading...
The design of artificial-noise-aided secure transmission over multiple-input, single-output, and multi-antenna eavesdropper (MISOME) slow fading channels is addressed in this paper. We consider the scenario where the messages sent by N-antenna transmitter are overheard by a K-antenna eavesdropper. The instantaneous channel state information of the eavesdropper's channel is assumed to be unknown to...
With the growing popularity of mobile applications such as voice over IP (VoIP) and real-time conversational video, and due to the scarcity of the available radio spectrum, increasing the spectral efficiency of wireless systems under quality of service (QoS) constraints becomes increasingly important. Accordingly, in this paper we investigate the maximum achievable rate of incremental redundancy type...
This paper presents a low-complexity detection scheme, which consists of a lattice sphere decoder (LSD), for Orthogonal Frequency Division Multiplexing (OFDM) systems. The inter-carrier interference (ICI) resulting from selective fading channel destroys the orthogonality of the OFDM signal and poses a significant limitation on wireless OFDM systems. The aim of this paper is to propose an efficient...
In the context of interference channels with multiple transmitters and receivers, we propose a novel decoding scheme called anywhere decoding that does not pre-assign the receiver at which each message should be decoded, but rather requires that each message must be decoded at some receiver. This paper illustrates how system performance can improve if we allow for this flexibility. After developing...
To get a generalized version of LDPC code, we construct (7, 4)-Hamming GLDPC code with (7, 4) Hamming component code in this paper, and give the number of short cycles of this GLDPC code as well as the code weight distribution. Via MLD, the negative effects of short cycles limited in the Hamming block can be eliminated. Simulation results show that, up to 2 dB coding gain can be obtained for GLDPC...
Accurate channel state information (CSI) is crucial for reliable decoding over fading channels. In many existing works, the CSI acquisition relies greatly on accurate knowledge of the channel model information (CMI), which includes, in particular, the power spectrum of the fading process and the statistical distribution of the fading gain. In practice, it may be difficult to obtain or keep track of...
A joint modulation and coding scheme is proposed based on Rateless Codes and Vector OFDM systems to combat fading over doubly selective channels. A rateless encoder can generate potentially unlimited coded symbol. Vector OFDM is a general transmission scheme, where OFDM and Single-Carrier systems can be seen as two extreme cases. The main focus of this paper is to design and analyze a Rateless Coded...
The primary objective of this paper is to make a performance comparison in terms of outage probability between decode-and-forward with joint decoding (DF-JD) and lossy-forward (LF) techniques. With DF-JD, only if the relay's received information sequence can be decoded with an arbitrarily low error probability, it is forwarded to the destination. On the contrary, with LF, the relay node always forwards...
Utilizing multiple antennas at the transmitter and receiver provides higher data rates and better reliability by exploiting spatial diversity. Space-time block codes (STBCs) is a simple approach for using multiple transmit and receive antennas that has been widely employed in standards. The STBCs introduced in the literature use independent two-dimensional constellations, while the performance of...
We present a link-state based composite decode-forward (DF) scheme for the relay channel comprised of independent coding and coherent block Markov coding. Although it is believed that block Markov coding is the optimal DF technique whenever the source- to-relay link is stronger than the direct link, we show that under some link-state conditions, independent coding achieves the same rate but also results...
This paper proposes a design of distributed space-time coding (DSTC) for the multiple access (MA) phase of a two-way relaying communication system. Bit-interleaved coded modulation (BICM) is used by the two terminal nodes and decoding based on the quaternary code representation is adopted at the relay. Based on an upper bound of the error probability, the impact of DSTC on the error performance is...
Cloud Radio Access Network (C-RAN) is a promising candidate for future mobile networks to sustain the exponentially increasing demand for data rate. The centralized architecture enables C-RAN to exploit multi-cell cooperation and interference management effectively. In C-RAN, one baseband unit (BBU) communicates with users through distributed Remote Radio Heads (RRHs) which are connected to the BBU...
An uplink transmission for Adaptive Dynamic Network Coding(ADNC) assisted Cooperative Cognitive Radio(CCR) system is proposed for facilitating the recovery of the source information received from the Primary Users (PUs) at the BS. The Cognitive Users (CUs) acting as Relay Nodes invoke the ADNC technique, where the CCR- based control information is exchanged between the CUs and the BS. % The network...
A novel scheme of unitary space-time constellations generation based on zero vectors adding are proposed for the multiple-antenna communication system. In the scheme, T2 zero row vectors are added into conventional unitary matrices directly, and the number of new unitary matrices obtained by different positions of the added zero vectors in T symbol duration is ⌊T/T2|⌋ times larger than that of conventional...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.