IEEE Transactions on Wireless Communications

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Displaying Results 1 - 25 of 55

Publication Year: 2018, Page(s):C1 - 2842
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• IEEE Transactions on Wireless Communications

Publication Year: 2018, Page(s): C2
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• Content Placement in Cache-Enabled Sub-6 GHz and Millimeter-Wave Multi-Antenna Dense Small Cell Networks

Publication Year: 2018, Page(s):2843 - 2856
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This paper studies the performance of cache-enabled dense small cell networks consisting of multi-antenna sub-6 GHz and millimeter-wave (mm-wave) base stations. Different from the existing works which only consider a single antenna at each base station, the optimal content placement is unknown when the base stations have multiple antennas. We first derive the successful content delivery probabilit... View full abstract»

• Distributed Linear Convolutional Space-Time Coding for Two-Hop Full-Duplex Relay $2times 2times 2$ Cooperative Communication Networks

Publication Year: 2018, Page(s):2857 - 2868
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In this paper, distributed linear convolutional space-time coding (DLC-STC) for two relay full-duplex (FD) $2times 2times 2$ cooperative communication networks is presented. A network topology model which consists of two sources, two destinations and one layer of two relays, is considered. In this communication model, two sou... View full abstract»

• Joint Beamformer Design for Wireless Fronthaul and Access Links in C-RANs

Publication Year: 2018, Page(s):2869 - 2881
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This paper presents a joint design framework of fronthaul and access links in cloud radio access networks, wherein the fronthaul data delivery between the central processor (CP) and small-cell base stations (SBSs) is carried over wireless links, which is more cost effective and flexible than the conventional wired fronthaul solutions. In this framework, the coordinated beamforming scheme is adopte... View full abstract»

• Long-Term Power Procurement Scheduling Method for Smart-Grid Powered Communication Systems

Publication Year: 2018, Page(s):2882 - 2892
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With the emergence of smart grids, adopting dynamic energy pricing models has become both possible and desirable. With such a pricing dynamicity, great savings in energy costs can be achieved in telecommunication systems when energy is procured efficiently through carefully designed real-time resource schedulers. Broadly speaking, existing scheduling algorithms can be categorized into two classes:... View full abstract»

• Novel 3-D Non-Stationary Wideband Models for Massive MIMO Channels

Publication Year: 2018, Page(s):2893 - 2905
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In this paper, a novel 3-D non-stationary wideband geometry-based stochastic theoretical channel model for massive multiple-input multiple-output communication systems is proposed. First, a second-order approximation to the spherical wavefront in space and time domains, i.e., parabolic wavefront, is proposed to efficiently model near-field effects. Second, View full abstract»

• Achievable Throughput of Energy Harvesting Fading Multiple-Access Channels Under Statistical QoS Constraints

Publication Year: 2018, Page(s):2906 - 2917
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This paper studies the achievable throughput of fading multiple-access channels (MACs) with energy harvesting transmitters subject to statistical quality of service (QoS) constraints in the form of limitations on the buffer overflow probability. Effective capacity, which characterizes the maximum constant arrival rate that a given process can support while satisfying the QoS constraints, is employ... View full abstract»

• Securing Visible Light Communication Systems by Beamforming in the Presence of Randomly Distributed Eavesdroppers

Publication Year: 2018, Page(s):2918 - 2931
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This paper considers secrecy enhancement mechanisms in visible light communication (VLC) systems with spatially distributed passive eavesdroppers (EDs) under the assumption that there are multiple LED transmitters and one legitimate user equipment. Based on certain amplitude constraints, we propose a beamforming scheme to improve secrecy performance. Contrary to the case where null-steering is mad... View full abstract»

• Sector and Site Switch-Off Regular Patterns for Energy Saving in Cellular Networks

Publication Year: 2018, Page(s):2932 - 2945
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Cell switch-off (CSO) is an important approach to reducing energy consumption in cellular networks during off-peak periods. CSO addresses the research question of which cells to switch off when. Whereas online CSO, based on immediate user demands and channel states, is problematic to implement and difficult to model, off-line CSO is more practical and tractable. F... View full abstract»

• Frequency-Domain Compressive Channel Estimation for Frequency-Selective Hybrid Millimeter Wave MIMO Systems

Publication Year: 2018, Page(s):2946 - 2960
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Channel estimation is useful in millimeter wave (mm-wave) MIMO communication systems. Channel state information allows optimized designs of precoders and combiners under different metrics, such as mutual information or signal-to-interference noise ratio. At mm-wave, MIMO precoders and combiners are usually hybrid, since this architecture provides a means to trade-off power consumption and achievab... View full abstract»

• Joint Power Allocation and Beamforming for Non-Orthogonal Multiple Access (NOMA) in 5G Millimeter Wave Communications

Publication Year: 2018, Page(s):2961 - 2974
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In this paper, we explore non-orthogonal multiple access (NOMA) in millimeter-wave (mm-wave) communications (mm-wave-NOMA). In particular, we consider a typical problem, i.e., maximization of the sum rate of a 2-user mm-wave-NOMA system. In this problem, we need to find the beamforming vector to steer towards the two users simultaneously subject to an analog beamforming structure, while allocating... View full abstract»

• Online Fixed Fraction Policies in Energy Harvesting Communication Systems

Publication Year: 2018, Page(s):2975 - 2986
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We consider power scheduling policies for single-user energy harvesting communication systems, where the goal is to characterize online policies that maximize the long term average utility, for general concave and monotonically increasing utility functions. The transmitter relies on energy harvested from nature to send its messages to the receiver, and is equipped with a finite-si... View full abstract»

• Robust Unambiguous Estimation of Angle-of-Arrival in Hybrid Array With Localized Analog Subarrays

Publication Year: 2018, Page(s):2987 - 3002
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Hybrid array is able to leverage array gains, transceiver sizes, and costs for massive multiple-input-multiple-output systems in millimeter-wave frequencies. Challenges arise from the estimation of angle-of-arrival (AoA) in localized hybrid arrays, due to the array structure and the resultant estimation ambiguities and susceptibility to noises. This paper eliminates the ambiguities and enhances th... View full abstract»

• Capacity Bounds and High-SNR Capacity of MIMO Intensity-Modulation Optical Channels

Publication Year: 2018, Page(s):3003 - 3017
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The capacity of the intensity modulation direct detection multiple-input-multiple-output channel is studied. Therein, the nonnegativity constraint of the transmit signal limits the applicability of classical schemes, including precoding. Thus, new ways are required for deriving capacity bounds for this channel. To this end, capacity lower bounds are developed in this paper by deriving the achievab... View full abstract»

• Multiband Spectrum Sensing in Cognitive Radio Networks With Secondary User Hardware Limitation: Random and Adaptive Spectrum Sensing Strategies

Publication Year: 2018, Page(s):3018 - 3029
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Hardware limitation at the secondary user (SU) terminal makes multiband (wideband) spectrum sensing more challenging. This paper considers spectrum sensing under SU hardware limitation, where the SU can only sense a small portion of the multiband spectrum for a given time period. This introduces a design issue of selecting channels to sense at a given time. A random spectrum sensing strategy (RSSS... View full abstract»

• Hybrid Content Caching in 5G Wireless Networks: Cloud Versus Edge Caching

Publication Year: 2018, Page(s):3030 - 3045
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Most existing content caching designs require accurate estimation of content popularity, which can be challenging in the dynamic mobile network environment. Moreover, emerging hierarchical network architecture enables us to enhance the content caching performance by opportunistically exploiting both cloud-centric and edge-centric caching. In this paper, we propose a hybrid content caching design t... View full abstract»

• Transmission Optimization for Hybrid Half/Full-Duplex Relay With Energy Harvesting

Publication Year: 2018, Page(s):3046 - 3058
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In this paper, the transmission optimization of a dual-hop decode-and-forward relaying system is investigated, where the relay capable of energy harvesting from ambient environment can work in hybrid half-duplex (HD) and/or full-duplex (FD) mode. To maximize the throughput from source to destination, the relay’s working mode is optimized under the constraint of random energy arrival. In par... View full abstract»

• Transmit Signal Designs for Spatial Modulation With Analog Phase Shifters

Publication Year: 2018, Page(s):3059 - 3070
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In this paper, we study transmit codebook designs for spatial modulation with analog phase shifters. The proposed spatial modulation with analog phase shifters can send more spatial symbols than conventional spatial modulation, while reserving the low complexity of single RF-chain MIMO structure. The main idea is to transmit $N_{t}$ View full abstract»

• Market Mechanisms for Dynamic Spectrum Access (DSA)

Publication Year: 2018, Page(s):3071 - 3081
| | PDF (1531 KB)

This paper applies fundamental market-based approaches to the problem of (wireless) spectrum sharing between a licensed primary user (PU) and an unlicensed secondary user (SU). We consider both orthogonal and non-orthogonal modes of dynamic spectrum access (DSA), and explore rates and profits at market equilibrium. Our analytical formulation is distinct from prior... View full abstract»

• Cost-Optimal Caching for D2D Networks With User Mobility: Modeling, Analysis, and Computational Approaches

Publication Year: 2018, Page(s):3082 - 3094
| | PDF (1961 KB)

Caching popular files at the user equipments (UEs) provides an effective way to alleviate the burden of the backhaul networks. Generally, popularity-based caching is not a system-wide optimal strategy, especially for user mobility scenarios. Motivated by this observation, we consider optimal caching with the presence of mobility. A cost-optimal caching problem (COCP) for device-to-device (D2D) net... View full abstract»

• Wireless Backhaul: Performance Modeling and Impact on User Association for 5G

Publication Year: 2018, Page(s):3095 - 3110
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Wireless technology is the strongest contender for catering for the 5G backhaul (BH) stipulated performance, where optical fiber is unavailable. In the presence of ultra-dense networks, such occurrences are exponentially increasing, and different wireless technologies are investigated for this application. We present the first BH-specific wireless link performance modeling that considers its inher... View full abstract»

• Inference From Randomized Transmissions by Many Backscatter Sensors

Publication Year: 2018, Page(s):3111 - 3127
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Attaining the vision of Smart Cities requires the deployment of an enormous number of sensors for monitoring various conditions of the environment. Backscatter sensors have emerged to be a promising solution due to the uninterruptible energy supply and relative simple hardwares. On the other hand, backscatter sensors with limited signal processing capabilities are unable to support conventional al... View full abstract»

Publication Year: 2018, Page(s):3128 - 3140
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Proactive caching is considered a cost-effective method to address the backhaul bottleneck problem in cellular network. In this paper, we propose a novel popularity predicting–caching procedure that takes raw video data as an input to determine an optimal cache placement policy, which deals with both published and unpublished videos. To anticipate the popularity of unpublished videos of whi... View full abstract»

• Joint Channel Identification and Estimation in Wireless Network: Sparsity and Optimization

Publication Year: 2018, Page(s):3141 - 3153
| | PDF (1708 KB)

In this paper, we study channel identification for a wireless network with the aid of compressed sensing (CS) in both cases of known and unknown sparsity levels of clusters. For the unknown case, we propose using blind CS signal recovery algorithm to sequentially estimate both sparsity level and channel gains. The refined version of blind CS technique is also prov... View full abstract»

Aims & Scope

The IEEE Transactions on Wireless Communications publishes high-quality manuscripts on advances in the state-of-the-art of wireless communications.

Full Aims & Scope

Editor-in-Chief
Martin Haenggi
twc@nd.edu