# IEEE Communications Letters

## Filter Results

Displaying Results 1 - 25 of 56

Publication Year: 2016, Page(s):C1 - 1911
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• ### IEEE Communications Society

Publication Year: 2016, Page(s): C2
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• ### Largest Permutation Codes With the Kendall $tau$ -Metric in $S_{5}$ and $S_{6}$

Publication Year: 2016, Page(s):1912 - 1915
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An important problem in the theory of permutation codes is finding the value of P(n, d), the size of the largest subset of the set of all permutations Sn with minimum Kendall τ-distance d. Using an integer programming approach, we find the values of P(5, d) for d ≥ 3 and P(6, d) for d ≥ 4. We give instances of codes which achieve these values. We also show that P(6, 3) ≥... View full abstract»

• ### Serially Concatenated Unity-Rate Codes Improve Quantum Codes Without Coding-Rate Reduction

Publication Year: 2016, Page(s):1916 - 1919
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Inspired by the astounding performance of the unity rate code (URC) aided classical coding and detection schemes, we conceive a quantum URC (QURC) for assisting the design of concatenated quantum codes. Unfortunately, a QURC cannot be simultaneously recursive as well as non-catastrophic. However, we demonstrate that, despite being non-recursive, our proposed QURC yields efficient concatenated code... View full abstract»

• ### On the Design of Multiuser Codebooks for Uplink SCMA Systems

Publication Year: 2016, Page(s):1920 - 1923
Cited by:  Papers (3)
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Sparse code multiple access (SCMA) is a promising uplink multiple access technique that can achieve superior spectral efficiency, provided that multidimensional codebooks are carefully designed. In this letter, we investigate the multiuser codebook design for SCMA systems over Rayleigh fading channels. The criterion of the proposed design is derived from the cutoff rate analysis of the equivalent ... View full abstract»

• ### An Upper Bound for the Capacity of Amplitude-Constrained Scalar AWGN Channel

Publication Year: 2016, Page(s):1924 - 1926
Cited by:  Papers (1)
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This letter slightly improves the upper bound in Thangaraj et al. for the capacity of the amplitude-constrained scalar Additive White Gaussian Noise (AWGN) channel. This improvement makes the upper bound within 0.002 bits of the capacity for (Eb/N0) ≤ 2.5 dB. View full abstract»

• ### Impact of Cochannel Interference on the Performance of Quadrature Spatial Modulation MIMO Systems

Publication Year: 2016, Page(s):1927 - 1930
Cited by:  Papers (2)
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Quadrature spatial modulation (QSM) was proposed recently as a viable multiple-input multiple-output (MIMO) communication technique for future wireless systems. QSM expands spatial modulation to include both real and imaginary spatial constellation symbols. In this letter, we consider an arbitrary QSM MIMO system operating over Rayleigh fading channels and in the presence of additive white Gaussia... View full abstract»

• ### Two-Level Quantized Soft-Output Demodulation of QAM Signals With Gray Labeling: A Geometric Approach

Publication Year: 2016, Page(s):1931 - 1934
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We propose a geometric approach to the design of a look-up table-based two-level quantized soft-output (SO) demodulator for coded schemes with quadrature amplitude modulation (QAM) signals with Gray bit labeling. This allows to derive quantized bit logarithmic likelihood ratios (LLRs) directly from the observables, without requiring the actual computation, followed by quantization, of LLRs at the ... View full abstract»

• ### User-Centric Precoding Designs for the Non-Regenerative MIMO Two-Way Relay Systems

Publication Year: 2016, Page(s):1935 - 1938
Cited by:  Papers (2)
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In this letter, we jointly design the source and relay precoders for non-regenerative multi-input multi-output two-way relay systems from the user-centric perspective. The two sources are assumed to be both energy efficiency (EE) desirable and spectral efficiency (SE) desirable. We aim at studying the EE-SE tradeoff between the two sources. The resulting problem is a non-convex multi-objective pro... View full abstract»

• ### A Layered Detection Algorithm Based on Interference Cancellation for FBMC-QAM

Publication Year: 2016, Page(s):1939 - 1942
Cited by:  Papers (1)
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We consider the residual interference problem for a filter bank-based multicarrier with quadrature amplitude modulation under multipath fading channels. In order to handle this problem, we propose a layered detection algorithm based on interference cancellation (IC). In proposed algorithm, we define two thresholds, a selection threshold and a region threshold for efficient IC. According to the sel... View full abstract»

• ### A New Family of Time-Limited Nyquist Pulses for OFDM Systems

Publication Year: 2016, Page(s):1943 - 1946
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We first provide the motivation for a new family of time-limited Nyquist pulses for Orthogonal Frequency Division Multiplexing (OFDM) systems by multiplying existing Nyquist pulses in the frequency domain. The condition required for the resultant pulses to have a roll-off factor less than or equal to unity is then established. The roll-off factor is found to be a function of two design parameters.... View full abstract»

• ### Partially Repeated SC-LDPC Codes for Multiple-Access Channel

Publication Year: 2016, Page(s):1947 - 1950
Cited by:  Papers (1)
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A simple partially repeated spatially coupled low-density parity-check (SC-LDPC) code is proposed for a multiple-access channel (MAC) with a large number of users. This code is constructed by selecting part of bits of an SC-LDPC code to be repeated. Since the decoding increment is only a log-likelihood ratio (LLR) combination, compared with the original SC-LDPC code, the decoding complexity scarce... View full abstract»

• ### A Serial Concatenation-Based Coding Scheme for Dimmable Visible Light Communication Systems

Publication Year: 2016, Page(s):1951 - 1954
Cited by:  Papers (1)
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Dimming control is desirable for visible light communication (VLC) systems to provide different levels of brightness. In this letter, we propose a new coding scheme for dimmable VLC systems based on serial concatenation of column-scaled (CS) low-density parity-check (LDPC) codes and constant weight codes (CWCs). In the proposed scheme, the cardinality of the finite field on which the CS LDPC code ... View full abstract»

• ### A Fundamental Tradeoff Between Total and Brown Power Consumption in Geographically Dispersed Data Centers

Publication Year: 2016, Page(s):1955 - 1958
Cited by:  Papers (1)
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This letter aims at deriving a fundamental tradeoff between the total and brown power consumption associated with geographical dispersed data centers, where utilizing more green energy mostly happens at the cost of increasing the total power consumption. To this end, we define a new service efficiency parameter for data centers in satisfying the QoS requirements based on the queuing analysis. More... View full abstract»

• ### Inter-Burst Segregation Protocol Guaranteeing Loss-Free Packet-Switched Networks

Publication Year: 2016, Page(s):1959 - 1962
Cited by:  Papers (1)
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In this letter, we propose a novel protocol, inter-burst segregation protocol (IBSP), which guarantees zero packet loss in packet-switched networks. The protocol is implemented and evaluated in network simulator-3 and in the data plane development kit (DPDK) implemented by INTEL. The results confirm that a packet-switched network can achieve zero packet-loss using IBSP, although nearly all the ban... View full abstract»

• ### Two Rerouting-Based Congestion Control Algorithms for Centrally Managed Flow-Oriented Networks

Publication Year: 2016, Page(s):1963 - 1966
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The evolution of the Internet and fiber-optic technologies has created new opportunities in terms of availability of different network services. The increasing demand for capacity, combined with strong reliability requirements, defines new challenges in the area of network management and design. Today, several users share the limited network resources, which may lead to frequent link congestions i... View full abstract»

• ### AAIC: Adaptive-Sliding-Connection-Window Solution to TCP Incast from Application Layer

Publication Year: 2016, Page(s):1967 - 1970
Cited by:  Papers (1)
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In datacenters, TCP Incast causes catastrophic goodput degradation to applications with many-to-one traffic pattern. This letter intends to tame Incast from application layer. For this goal, we first develop an analytical model to understand how to minimize Incast probability by tuning connection variables related to application. Then, enlightened by the model, we propose an adaptive application-l... View full abstract»

• ### Intrinsic ICI-Free Alamouti Coded FBMC

Publication Year: 2016, Page(s):1971 - 1974
Cited by:  Papers (2)
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Applying Alamouti code to filter bank multicarrier (FBMC) is a challenging issue due to the intrinsic inter-antenna inter-carrier interference (ICI), which does not exist in Alamouti coded orthogonal frequency division multiplexing (OFDM). We propose a frequency reversal Alamouti coded scheme for FBMC. As the frequency reversal symbol arrangement in itself cannot handle the inter-antenna ICI, we c... View full abstract»

• ### On the Configuration-Dependent Singularity of GFDM Pulse-Shaping Filter Banks

Publication Year: 2016, Page(s):1975 - 1978
Cited by:  Papers (2)
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It is known that, under some configurations, the generalized frequency-division multiplexing (GFDM) pulse-shaper matrix is singular. Moreover, a GFDM pulse-shaper matrix may have unequal magnitude gains in different vector-space dimensions. This letter presents a Fourier-transform-based decomposition of the GFDM pulse-shaper matrix from which the above GFDM properties, as well as some other ones, ... View full abstract»

• ### Optimal Design of Dual-Hop VLC/RF Communication System With Energy Harvesting

Publication Year: 2016, Page(s):1979 - 1982
Cited by:  Papers (3)
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In this letter, we consider a dual-hop heterogeneous visible light communication (VLC)/radio frequency (RF) communication system to extend the coverage of VLC systems. Besides detecting the information over VLC link, the relay is able to harvest energy from the first-hop VLC link, by extracting the direct current component of the received optical signal, and uses the harvested energy to retransmit... View full abstract»

• ### Anycast Planning in Space Division Multiplexing Elastic Optical Networks With Multi-Core Fibers

Publication Year: 2016, Page(s):1983 - 1986
Cited by:  Papers (4)
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Elastic optical networks (EONs) play an important role for the next generation core networks, especially for supporting cloud computing. However, network traffic has been growing exponentially and almost reached the physical capacity limit of single-mode fibers. Space division multiplexing (SDM) can be potentially employed to increase the fiber capacity. Multi-core fibers (MCFs) make use of SDM to... View full abstract»

• ### A New Exploration of FB-Shrew Attack

Publication Year: 2016, Page(s):1987 - 1990
Cited by:  Papers (1)
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Shrew attack is a type of typical transmission control protocol (TCP)-targeted low-rate denial of service attacks. Guirguis proposed a variant of the Shrew attack, which is called the full-buffer Shrew (FB-Shrew) attack. By maximizing the attack period and minimizing the attack rate, FB-Shrew attack can achieve the optimal impact. However, Guirguis's study has some limitations that mainly lie in n... View full abstract»

• ### Bayesian Stackelberg Game for Antijamming Transmission With Incomplete Information

Publication Year: 2016, Page(s):1991 - 1994
Cited by:  Papers (3)
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The smart jammers pose a severe threat to wireless communications due to their abilities of learning the users' transmission strategies. A Stackelberg game can be formulated to model and analyze the hierarchical interactions between the user and the smart jammer. In this letter, an antijamming Bayesian Stackelberg game with incomplete information is proposed. In the proposed game, the user who act... View full abstract»

• ### Coupling Information Transmission With Approximate Message-Passing

Publication Year: 2016, Page(s):1995 - 1998
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A low-complexity approximate message-passing demodulation algorithm is derived for the coupling information transmission multiuser communication technique. It is demonstrated that multiuser loads as high as 3.5 are achievable while the system exhibits near-capacity spectral efficiency. View full abstract»

• ### Joint Effect of User Activity Sensing and Biased Cell Association in Energy Efficient HetNets

Publication Year: 2016, Page(s):1999 - 2002
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In heterogeneous networks, the active/sleep strategy for base stations (BSs) provides an effective way to match capacity to demand and also improve energy efficiency. At the same time, environmental awareness and self-organizing features are expected to play important roles in improving the network performance. In this letter, we propose an active/sleep scheme based on user activity sensing of sma... 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