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# IEEE Communications Letters

## Filter Results

Displaying Results 1 - 25 of 52

Publication Year: 2013, Page(s):c1 - c4
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• ### Staff List

Publication Year: 2013, Page(s): c2
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• ### Generalization of Craig's Second Formula

Publication Year: 2013, Page(s):433 - 434
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A generalization of the Craig formula for Q2(x) is derived using a geometrical interpretation of the Craig formula. A new Craig-like formula for Q(x)Q(y) is derived. View full abstract»

• ### Realistic Modeling of Far-End Crosstalk in Metallic Cables

Publication Year: 2013, Page(s):435 - 438
Cited by:  Papers (1)
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Crosstalk and especially far-end crosstalk (FEXT) represents the most serious source of disturbance in today's digital transmission systems. It mostly limits the information capacity of current xDSL digital subscriber lines and local data networks with unshielded or shielded twisted pairs. The elimination of FEXT will require implementation of advanced methods for its modeling to obtain required p... View full abstract»

• ### Performances of Weighted Cyclic Prefix OFDM with Low-Complexity Equalization

Publication Year: 2013, Page(s):439 - 442
Cited by:  Papers (11)
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In this paper, we justify low-complexity equalization techniques for weighted cyclic prefix (WCP)-OFDM. This modulation technique refers to filter bank based multicarrier (FBMC) transmission system provided with short filters. It allows the use of non-rectangular waveforms in order to mitigate interference caused by time-frequency selective channels while preserving an efficient implementation. View full abstract»

• ### Reduced-Dimension MUSIC for Angle and Array Gain-Phase Error Estimation in Bistatic MIMO Radar

Publication Year: 2013, Page(s):443 - 446
Cited by:  Papers (17)
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In this letter, the problem of joint angle and array gain-phase error estimation for bistatic multiple-input multiple- output (MIMO) radar is investigated, and an algorithm for joint estimation with the characteristics of multiple signal classification (MUSIC) is proposed. Through reduced-dimension transform, the angles can be obtained via two one-dimensional peak searches, and the array gain-phas... View full abstract»

• ### Mask Compliant Precoder for OFDM Spectrum Shaping

Publication Year: 2013, Page(s):447 - 450
Cited by:  Papers (16)
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In this letter, a precoder for shaping the spectrum of orthogonal frequency division multiplexing (OFDM) is presented. Unlike existing methods that focus on minimizing or forcing the sidelobes to zero, the proposed precoder is designed with the goal of controlling the out-of-band emissions beneath a particular power level without impacting the bit error rate (BER) performance. A small distortion i... View full abstract»

• ### Accelerating Iterative Detection for Spatially Coupled Systems by Collaborative Training

Publication Year: 2013, Page(s):451 - 454
Cited by:  Papers (1)
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This letter proposes a novel method for accelerating iterative detection for spatially coupled (SC) systems. An SC system is constructed by one-dimensional coupling of many subsystems, which are classified into training and propagation parts. An irregular structure is introduced into the subsystems in the training part so that information in that part can be detected successfully. The obtained rel... View full abstract»

• ### A Novel Space Time Block Code Scheme for Three Time Slots and Two Transmit Antennas

Publication Year: 2013, Page(s):455 - 458
Cited by:  Papers (7)
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Mobile station (MS) in the Long Term Evolution Advanced (LTE-A) equips with two transmit antennas and the data are transmitted during three time slots. This has brought up an interesting space time block code (STBC) design for LTE-A. In this paper, a novel STBC scheme is proposed for three time slots and two antennas. The proposed STBC scheme has these properties: i) the scheme can achieve full ra... View full abstract»

• ### Green' Cooperative Spectrum Sharing Communication

Publication Year: 2013, Page(s):459 - 462
Cited by:  Papers (17)
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Financial and environmental considerations provide new trends in wireless communication network known as green communication. The main object of green communication is to save energy consumption of the communication system as much as possible with users' quality of service (QoS) guaranteed. In this paper, cooperative spectrum sharing is investigated as a means of energy saving. We present an optim... View full abstract»

• ### Channel Selection and Spectrum Availability Check Scheme for Cognitive Radio Systems Considering User Mobility

Publication Year: 2013, Page(s):463 - 466
Cited by:  Papers (4)
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In cognitive radio (CR) systems, spectrum availability changes as the location of mobile users changes. As a result, the band that a CR user is currently using can become unavailable, so the user should check periodically whether the band is still vacant. This checking can cause extra overhead to the system. Herein, we consider channel selection and determine the optimal time interval between two ... View full abstract»

• ### A Predator-Prey Model for Dynamics of Cognitive Radios

Publication Year: 2013, Page(s):467 - 470
Cited by:  Papers (3)
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Cognitive radio technology is well known to enhance spectrum utilization via opportunistic transmission at link level. However, the time dynamics of spectrum utilization among primary system users and secondary cognitive radio users in such cognitive radio networks remain unknown at this time. We note that the system behavior is very similar to interaction among different species coexisting in an ... View full abstract»

• ### Power Minimization for OFDM Transmission with Subcarrier-Pair Based Opportunistic DF Relaying

Publication Year: 2013, Page(s):471 - 474
Cited by:  Papers (18)
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This paper develops a sum-power minimized resource allocation (RA) algorithm subject to a sum-rate constraint for cooperative orthogonal frequency division modulation (OFDM) transmission with subcarrier-pair based opportunistic decode-and-forward (DF) relaying. The improved DF protocol first proposed in is used with optimized subcarrier pairing. Instrumental to the RA algorithm design is appropria... View full abstract»

• ### Cognitive Amplify-and-Forward Relaying with Best Relay Selection in Non-Identical Rayleigh Fading

Publication Year: 2013, Page(s):475 - 478
Cited by:  Papers (72)
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This paper investigates several important performance metrics of cognitive amplify-and-forward (AF) relay networks with a best relay selection strategy and subject to non-identical Rayleigh fading. In particular, assuming a spectrum sharing environment consists of one secondary user (SU) source, K SU relays, one SU destination, and one primary user (PU) receiver, closed-form expressions for the ou... View full abstract»

• ### Buffer-Aided Half-Duplex Relaying Can Outperform Ideal Full-Duplex Relaying

Publication Year: 2013, Page(s):479 - 482
Cited by:  Papers (19)
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We consider a three-node relay network comprised of a source, a relay, and a destination, and compare the throughputs of ideal full-duplex (FD) and half-duplex (HD) relaying. For FD relaying, we assume that the relay uses half of its antennas for reception and the other half for transmission. In contrast, for HD relaying, the relay uses all of its antennas for either reception or transmission and ... View full abstract»

• ### Exact Outage Probability of Relay Selection in Decode-and-Forward Based Cooperative Multicast Systems

Publication Year: 2013, Page(s):483 - 486
Cited by:  Papers (22)
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In this letter, we present the outage performance of decode-and-forward based cooperative multicast systems with the best relay selection (CM-RS) over Rayleigh fading channels. Especially, we provide an exact and closed-form expression for the outage probability of CM-RS and its diversity order. Through numerical results, the analysis is verified, and the outage performance of CM-RS is compared wi... View full abstract»

• ### Outage Probability of TDBC Protocol in Multiuser Two-Way Relay Systems with Nakagami-m Fading

Publication Year: 2013, Page(s):487 - 490
Cited by:  Papers (15)
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This paper considers a multiuser two-way relay system with time division broadcast (TDBC) protocol, where multiple end-sources compete to exchange information with another end-source through the help of a single half-duplex amplify-and-forward (AF) relay. We derive a tight closed-form lower bound for the system outage probability over Nakagami-m fading channels with integer fading parameters. An a... View full abstract»

• ### Optimal Training Signal Design for Estimation of Correlated MIMO Channels in Two-Way Amplify-and-Forward Relay Systems

Publication Year: 2013, Page(s):491 - 494
Cited by:  Papers (7)
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In this study, we design a training signal for a correlated two-way amplify-and-forward (AF) relay channel, where the relay system consists of two sources and one relay, and each terminal is equipped with multiple antennas. In the system, given that a mean square error (MSE) exists at each source, we minimize the sum of the two MSEs. In particular, we first derive a linear minimum MSE channel esti... View full abstract»

• ### Channel Coding Increases the Achievable Rate of the Cognitive Networks

Publication Year: 2013, Page(s):495 - 498
Cited by:  Papers (3)
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In this letter, we investigate employing Trellis Coded Modulation (TCM) in an Orthogonal Frequency Division Multiple Access (OFDMA) based secondary system in an underlay cognitive radio network. While it is expectable for channel coding to improve the performance in the secondary service compared to the uncoded case at the expense of rate reduction, our results indicate that the benefits of such u... View full abstract»

• ### An Approximation of the First Order Marcum Q-Function with Application to Network Connectivity Analysis

Publication Year: 2013, Page(s):499 - 502
Cited by:  Papers (8)
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An exponential-type approximation of the first order Marcum Q-function is presented, which is robust to changes in its first argument and can easily be integrated with respect to the second argument. Such characteristics are particularly useful in network connectivity analysis. The proposed approximation is exact in the limit of small first argument of the Marcum Q-function, in which case the opti... View full abstract»

• ### Optimal Relay Selection for Outdated CSI

Publication Year: 2013, Page(s):503 - 506
Cited by:  Papers (10)
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Consider the scenario of relay selection in an environment where the channel estimates are outdated, yet their reliability is known. For this scenario, we propose the optimal relay selection policy, in a minimum outage probability sense. We show that, if the reliabilities of the channel estimates are dissimilar across the relays, this policy offers a noteworthy improvement in terms of array gain, ... View full abstract»

• ### Comments on Fair and Efficient Relay Selection and Spectrum Allocation for Multi-User and Multi-Relay Cooperative Cellular Networks'

Publication Year: 2013, Page(s):507 - 508
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In a recent letter, Zhang et al. proposed a relay selection and spectrum allocation scheme in the multi-user and multi-relay cooperative cellular networks. This comment points out one inaccurate equation and the erroneous figures for the above letter. Meanwhile, the correct equation and figures are provided. View full abstract»

• ### A Lightweight Algorithm for Probability-Based Spectrum Decision Scheme in Multiple Channels Cognitive Radio Networks

Publication Year: 2013, Page(s):509 - 512
Cited by:  Papers (9)
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Compare with the sensing-based spectrum decision scheme, the probability-based spectrum decision scheme has been shown to yield a shorter queuing delay time in Cognitive Radio (CR) system that consists of many Primary Users (PUs) and Secondary Users (SUs). However, the former scheme had cumbersome algorithms and slowly converging speed. In this paper, by introducing Lagrange function, we propose a... View full abstract»

• ### A Power Amplifier Energy Efficient Polarization Modulation Scheme Based on the Optimal Pre-Compensation

Publication Year: 2013, Page(s):513 - 516
Cited by:  Papers (12)
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To improve Power Amplifier (PA) energy efficiency, a Polarization Modulation (PM) scheme in wireless communication is proposed. The proposed scheme uses polarization state as the information-bearing parameter and can let the PA work in its nonlinear region without suffering distortion. Furthermore, to mitigate the impairment to the PM from the polarization dependent loss effect of the wireless cha... View full abstract»

• ### WLAN Service Providers' Price Competition with Uncertainty in User Demand

Publication Year: 2013, Page(s):517 - 520
Cited by:  Papers (1)
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In this letter, uncertainty in users' network selection is modeled by a Markov chain. In the presence of such uncertainty, the price competition game of wireless local area network (WLAN) service providers (SPs) is analyzed and the existence of Bayesian Nash equilibrium is proved. Using the price of anarchy as a metric of efficiency for social welfare maximization, it is shown that an increase in ... 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