# IEEE Communications Letters

## Filter Results

Displaying Results 1 - 25 of 56

Publication Year: 2016, Page(s):C1 - 199
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• ### IEEE Communications Society

Publication Year: 2016, Page(s): C2
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• ### On Progressive Edge-Growth Interleavers for Turbo Codes

Publication Year: 2016, Page(s):200 - 203
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In this letter, we show that the family of progressive edge growth interleavers ensures optimal growth of the minimum distance of turbo codes, which grows as log(N), where N is the interleaver size. This family of interleavers fits well the self-concatenated structure of turbo codes, hence it works with irregular turbo codes as well. We will start by introducing the self-concatenated structure of ... View full abstract»

• ### Reduce the Complexity of List Decoding of Polar Codes by Tree-Pruning

Publication Year: 2016, Page(s):204 - 207
Cited by:  Papers (3)
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Polar codes under cyclic redundancy check-aided successive cancellation list (CA-SCL) decoding can outperform the turbo codes and the LDPC codes when code lengths are configured to be several kilobits. In order to reduce the decoding complexity, a novel tree-pruning scheme for the SCL/CA-SCL decoding algorithms is proposed in this letter. In each step of the decoding procedure, the candidate paths... View full abstract»

• ### Binary Linear Codes With Few Weights

Publication Year: 2016, Page(s):208 - 211
Cited by:  Papers (6)
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Linear codes can be applied in secret sharing, authentication codes, association schemes, and strongly regular graphs. This letter generalizes the construction of linear codes by Ding et al. [9], uses more flexible construction method, and presents linear codes with few weights. These codes contain two-weight linear codes, one-weight linear codes, and three-weight linear codes. These codes contain... View full abstract»

• ### Multi-CRC Polar Codes and Their Applications

Publication Year: 2016, Page(s):212 - 215
Cited by:  Papers (6)
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Polar codes under successive cancelation list (SCL) decoding are capable of achieving almost the same or better performance than turbo codes or low density parity-check codes with the help of single cyclic redundancy check (CRC). This decoding scheme, however, suffers from very high complexity with long delay and large memory space. Motivated by this research problem, we propose a novel coding sch... View full abstract»

• ### Message Passing-Based Decoding of Convolutional Codes: Performance and Complexity Analysis

Publication Year: 2016, Page(s):216 - 219
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In this letter, we propose to apply message passing algorithms to decode standard convolutional codes and assess the resulting performance and the required complexity compared to conventional decoding algorithms for convolutional codes by concentrating on the Viterbi algorithm (VA). We show that, in contrast to the VA for which the decoding complexity increases exponentially with m, the number of ... View full abstract»

• ### Rethinking Fractional Repetition Codes: New Construction and Code Distance

Publication Year: 2016, Page(s):220 - 223
Cited by:  Papers (2)
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Modern storage systems are increasingly employing erasure codes to protect data against disk failures. Various codes have been elaborately constructed to achieve the desirable storage performance. In this letter, we consider fractional repetition (FR) codes, which provide uncoded exact repairs with minimum repair bandwidth. We present a novel code construction framework that is built on existing c... View full abstract»

• ### Joint Successive Cancellation Decoding for Bit-Interleaved Polar Coded Modulation

Publication Year: 2016, Page(s):224 - 227
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To improve the performance of bit-interleaved polar-coded modulation (BIPCM), a joint successive cancellation (SC) decoding algorithm for BIPCM is proposed. In the proposed algorithm, the correlation between coded bits, which are mapped into the same symbol is considered. Based on the recursive structure of the proposed algorithm, the demapping and deinterleaving units are combined with SC decoder... View full abstract»

• ### Hybrid Precoding for Physical Layer Multicasting

Publication Year: 2016, Page(s):228 - 231
Cited by:  Papers (2)
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This work investigates the problem of downlink transmit precoding for physical layer multicasting with a limited number of radio-frequency (RF) chains. To tackle the RF hardware constraint, we consider a hybrid precoder that is partitioned into a high-dimensional RF precoder and a low-dimensional baseband precoder. Considering a total transmit power constraint over the RF chains, the goal is to ma... View full abstract»

• ### Analysis of Frequency Domain Oversampled MMSE SC-FDE

Publication Year: 2016, Page(s):232 - 235
Cited by:  Papers (1)
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Frequency domain oversampling (FDO) is investigated to improve the error performance of MMSE SC-FDE for multipath channels. The impact of FDO is analyzed in regard to the outage probability. The results show that FDO can significantly enhance the performance of MMSE SC-FDE when the ratio of block length to channel memory length is small such as in underwater acoustic channels. Its advantage is obs... View full abstract»

• ### Covert Communications When the Warden Does Not Know the Background Noise Power

Publication Year: 2016, Page(s):236 - 239
Cited by:  Papers (7)
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If the warden Willie attempting to detect the transmission knows the statistics of his receiver noise, Alice can transmit no more than O(√n) covert bits reliably to Bob in n channel uses of an AWGN channel. However, if Willie does not know his noise statistics exactly, Alice can covertly transmit O(n) bits. In this letter, Willie lacks knowledge of his channel statistics but observes T(n) l... View full abstract»

• ### Performance of Quadrature Spatial Modulation in Amplify-and-Forward Cooperative Relaying

Publication Year: 2016, Page(s):240 - 243
Cited by:  Papers (10)
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Quadrature spatial modulation (QSM) is a recent digital multiple-input multiple-output (MIMO) transmission technique. Combined with cooperative relaying, QSM improves the overall spectral efficiency and enhances the communication reliability. This letter studies the performance of QSM amplify-and forward cooperative relaying systems. In particular, a closed-form expression for the average pair-wis... View full abstract»

• ### A Novel SM-Based MIMO System With Index Modulation

Publication Year: 2016, Page(s):244 - 247
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Multiple-input multiple-output systems with spatial modulation (MIMO-SM) have been recently proposed for high data rate, low complexity transmission schemes. However, in the SM, the antenna of the transmitter is randomly activated by the spatially modulated information bit sequence. Due to bad conditions of the active antenna's channel determined by the SM technique, the system would be likely to ... View full abstract»

• ### BER Upper Bound Expressions in Coded Two-Transmission Schemes With Arbitrarily Spaced Signal Constellations

Publication Year: 2016, Page(s):248 - 251
Cited by:  Papers (1)
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The main contribution of this letter is the derivation of an upper bound BER expression, as a function of distances between signal points, for arbitrary constellations, in a generic, two-transmission scheme such as relaying, HARQ, or CoMP. The approach utilizes the product-state matrix, and thus the arbitrarily chosen constellations together with the encoders do not need to satisfy the quasi-regul... View full abstract»

• ### On the Capacity and Performance of Generalized Spatial Modulation

Publication Year: 2016, Page(s):252 - 255
Cited by:  Papers (7)
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Generalized spatial modulation (GSM) uses N antenna elements but fewer radio frequency (RF) chains (R) at the transmitter. In GSM, apart from conveying information bits through R modulation symbols, information bits are also conveyed through the indices of the R active transmit antennas. In this letter, we derive lower and upper bounds on the the capacity of a (N, M, R)-GSM MIMO system, where M is... View full abstract»

• ### A Low PAPR Constellation Mapping Scheme for Rate Compatible Modulation

Publication Year: 2016, Page(s):256 - 259
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This letter proposes a novel nonlinear constellation mapping (NLCM) scheme for the rate compatible modulation (RCM) approach in low-to-moderate signal to noise ratios (SNRs). In NLCM, each RCM coded symbol is mapped to a complex-valued amplitude phase shift keying (APSK) constellation point. Moreover, we provide a novel method of designing code degree and weight set for a wide SNR range. The propo... View full abstract»

• ### First Demonstration of Virtual Transport Network Services With Multi-layer Protection Schemes over Flexi-grid Optical Networks

Publication Year: 2016, Page(s):260 - 263
Cited by:  Papers (5)
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Based on the virtualization technique in optical networks, virtual transport network services (VTNS) has been introduced as a new kind of service in transport networks. With VTNS, transport providers are able to provide their customers entire virtual topologies instead of traditional end-to-end connections. This letter analyzes the new characteristics (i.e., multiple operators, diversified service... View full abstract»

• ### Optimal Constellation Design for Indoor $2\times 2$ MIMO Visible Light Communications

Publication Year: 2016, Page(s):264 - 267
Cited by:  Papers (7)
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Owing to the line-of-sight characteristics in indoor visible light communication (VLC) systems, different geometrical locations of transmitters and receivers provide distinct channel correlations, thus bringing various impacts on the conventional multiple-input multiple-output (MIMO) techniques. In this letter, by taking full advantage of the channel state information (CSI) available at both the t... View full abstract»

• ### Max-Max User-Relay Selection Scheme in Multiuser and Multirelay Hybrid Satellite-Terrestrial Relay Systems

Publication Year: 2016, Page(s):268 - 271
Cited by:  Papers (8)
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We consider a hybrid satellite-terrestrial relay system that employs a multiantenna satellite to communicate with multiple users via multiple amplify-and-forward relays. We employ a max-max user-relay selection scheme to minimize the outage probability of the system. Considering both variable and fixed gain relaying protocols, we derive exact closed-form expressions of outage probability and their... View full abstract»

• ### Two-Stage Channel Estimation With Estimated Windowing for MB-OFDM UWB System

Publication Year: 2016, Page(s):272 - 275
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We propose a two-stage channel estimation technique for high rate ultra-wideband communication system. In the preamble-stage, we perform initial channel estimation using least square approach followed by frequency-domain smoothing operation. Estimated channel at this stage is then windowed by a rectangular window of Hannan-Quinn criteria-optimized length. In the payload-stage, estimated channel fr... View full abstract»

• ### A Near-Optimal Detection Scheme Based on Joint Steepest Descent and Jacobi Method for Uplink Massive MIMO Systems

Publication Year: 2016, Page(s):276 - 279
Cited by:  Papers (10)
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A new approach based on joint steepest descent algorithm and Jacobi iteration is proposed to iteratively realize linear detections for uplink massive multiple-input multiple-output (MIMO) systems. Steepest descent algorithm is employed to obtain an efficient searching direction for the following Jacobi iteration to speed up convergence. Moreover, promising initial estimation and hybrid iteration a... View full abstract»

• ### BER-Optimized Precoders for OFDM Systems With Insufficient Cyclic Prefix

Publication Year: 2016, Page(s):280 - 283
Cited by:  Papers (3)
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This letter considers precoder design for orthogonal frequency division multiplexing (OFDM) systems with insufficient cyclic prefix (CP). Interference alignment is utilized to formulate the precoder design problem as a bit error rate (BER) minimization problem subject to a total power constraint. Subsequently, a novel closed-form solution is derived for the optimal precoder by exploiting Schur con... View full abstract»

• ### Joint Estimation of Channel and I/Q Imbalance in OFDM/OQAM Systems

Publication Year: 2016, Page(s):284 - 287
Cited by:  Papers (1)
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In this letter, we propose a preamble-based joint estimation of channel and I/Q imbalance in orthogonal frequency division multiplexing (OFDM) with offset quadrature amplitude modulation (OQAM) systems. To estimate the mixed effect of channel and I/Q imbalance in frequency domain, a preamble utilizing the staggered structure of OFDM/OQAM signal is designed, and the approximated Cramer-Rao bound (C... View full abstract»

• ### Linear Estimation of Clock Frequency Offset for Time Synchronization Based on Overhearing in Wireless Sensor Networks

Publication Year: 2016, Page(s):288 - 291
Cited by:  Papers (2)
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The overhearing mechanism in time synchronization has been an active research area for wireless sensor networks (WSNs), for it can save a significant amount of energy by exploiting the wireless medium broadcast property. Recently, based on acknowledgment (ACK) mechanism, a synchronization scheme has been proposed for practical WSNs that the timestamps can be directly inserted into the data frame a... View full abstract»

## Aims & Scope

IEEE Communications Letters publishes letters on the frontiers of research within the field of interest of the IEEE Communications Society in a timely manner.

Full Aims & Scope

Editor-in-Chief
Octavia Dobre