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Presents a listing of the editorial board, board of governors, current staff, committee members, and/or society editors for this issue of the publication.

In this letter, a method of constructing Hermitian dual containing quaternary linear codes from general quaternary linear codes is proposed. Based on this result, a construction method of binary linear quantum codes is obtained. Using three cyclic codes and one linear code over $\mathbb {F}_{4}$ that are not Hermitian dual containing, we construct four record breaking binary linear quantum codes. Furthermore

This letter explores the concept of non-coherent index modulation (IM) in a general setting from the standpoint of coding theory. In doing so, we establish a bijective mapping from the set of activation patterns of an IM system to the set of codewords of a binary block code. We show that a non-coherent IM system whose active indices are independently affected by additive white Gaussian noise and Rayleigh

Based on the extended Reed-Solomon (RS) code that has two information symbols over the field ${\mathbb F}_{q}$ , we can construct a binary regular matrix ${ {\boldsymbol{\textstyle H}}}(\gamma,\rho)$ , where $q:=2^{r}$ for some positive integer $r$ , $\gamma $ and $\rho $ are two positive integers such that $\gamma \le q$ and $\rho \le q$ . The matrix ${ {\boldsymbol{\textstyle H}}}(\gamma,\rho)$ specifies

For any odd prime $p$ , and a divisor $\ell $ of $p$ , we consider $I_\ell $ to be the set of all divisors of $p-1$ , which are less than or equal to $\ell $ . In this letter, we construct quantum codes from cyclic codes over $\mathbb F_{p}$ and $\mathbb F_{p} S_\ell $ , where $S_\ell =\prod _{i\in I_\ell }R_{i}$ , for $R_{i}=\frac {\mathbb F_{p}[u]}{\langle u^{i+1}-u\rangle }$ . For that, first we

This letter studies the proactive eavesdropping in a suspicious decode-and-forward relay system, where the suspicious communication is divided into transmitter-to-relay (ST-SR) phase and relay-to-destination (SR-SD) phase with partial channel selection over $N \ge 2$ orthogonal channels, and the monitor (E) can only jam/overhear the E-SR/SR-E link over $M \le N$ sub-channels for practicality. Under

This letter studies secure communications in a full-duplex relay (FDR) network when an eavesdropper overhears communications between legitimate parties. In a FDR network, both the amplify-and-forward relay and the destination operate in full-duplex for the purpose of achieving a higher secrecy rate and/or improving security. In particular, the destination is capable of receiving the relayed signal

This letter studies the Unmanned Aerial Vehicles (UAVs)-assisted proactive eavesdropping in the suspicious amplify-and-forward multi-relay system, where the suspicious transmitter based on opportunistic relaying protocol selects one best suspicious relay to communicate with the suspicious destination. In addition, we assume each UAV hovers over one specific relay for the purpose of jamming or eavesdropping

In cooperative communications, dynamic decode-and-forward transmission with rateless coding ( RC-DDF ) is most efficient in reaching/approaching channel capacity. However, it entails strict carrier synchronization among the source, relay and destination, making it hard to implement in practice. To remove the limitation, we propose a scheme named dynamic coded cooperation with incremental redundancy

A statistical process was proposed elsewhere and used to model the Nakagami- $\boldsymbol {m}$ , $\boldsymbol {\eta }$ - $\boldsymbol {\mu }$ , and $\boldsymbol {\alpha }$ - $\boldsymbol {\mu }$ complex signals. Since then, very little has been built upon its statistics. The aim of this letter is to deepen the understanding of this process, which includes the Gaussian one as a particular case. In particular

A data-oriented approach has been recently proposed that simultaneously supports ultra-high reliability and low latency in wireless transmission systems. In this letter, we analyze the performance of small data transmissions over fading channels in terms of a data-oriented performance metric. Through analytical results and associated numerical examples, we demonstrate the effectiveness of rate/power

Transmission Control Protocol with Network Coding (TCP/NC) and its variants were developed to improve the goodput performance of TCP protocol in lossy networks. However, no TCP/NC enhancement work can get a high goodput performance in bi-directional packet loss environments, especially with a high degree and/or burst loss of ACK packets. Therefore, we propose a new scheme called TCP/NC with Bi-directional

In this letter, we develop a general iterative receiver based on the minimum mean squared error with parallel interference cancellation (MMSE-PIC) for cyclic prefix (CP)-free transmission. In particular, we consider that the receiver detects several blocks jointly, which allows backward block correction (BC). Additionally, we provide a structure with reduced complexity for Orthogonal Frequency Division

In this letter, a simplified successive cancellation decoding algorithm of polar codes is proposed, where a hard decision rule is adopted by exploiting the prior information in frozen bits for better decoding performance. Considering the difference of the node reliability, a hypothesis-testing-based strategy is designed to select reliable unstructured nodes for hard decision. Then the reliable nodes

A novel low-complexity multiuser detection scheme is proposed for the asynchronous non-orthogonal multiple access (NOMA). Directly applying the conventional symbol-synchronous detection techniques for the asynchronous NOMA would result in high complexity. For low-complexity, we divide one frame with a large number of symbols into several small blocks. Furthermore, for real-time and low-delay processing

Multiuser detection based on the expectation propagation (EP) algorithm for the massive multiple-input multiple-output (M-MIMO) system has received considerable attention in recent years due to its good performance-complexity tradeoff. However, its performance degrades when the system is highly overloaded. Furthermore, the computational complexity increases fast as the number of receive antennas increases

Massive multiple-input multiple-output (MIMO) systems under time division duplexing (TDD), assume reciprocity between the uplink and downlink channels making it essential for the base station (BS) to estimate two-dimensional direction-of-arrival (2D-DOA) for downlink operations. Owning to the large dimension, computational complexity becomes a major concern for these systems in addition to the estimation

In this letter, a quaternion-based ESPRIT-type algorithm called augmented quaternion ESPRIT (AQ-ESPRIT) is proposed for direction of arrival (DOA) estimation with a co-located crossed-dipole array. Firstly, two quaternion models are constructed by judiciously arranging the observed signals, and then concatenated to form a new AQ model. Secondly, the AQ signal subspace is estimated by applying the quaternionic

Source localization is a key technology in array signal processing. However, it has a serious problem that the direction of arrival (DOA) estimation accuracy is reduced at low signal-to-noise ratio (SNR). Thus, this Letter proposes an improved near-field multiple signal classification (INF-MUSIC) algorithm to improve DOA estimation accuracy at low SNR. Firstly, the fourth-order cumulant is used to

In this letter, received signal strength (RSS) based target localization is studied. First we start with the case of known emitted power of target. The least squares (LS) approach is adopted, and the object function is shown to be decomposed as a convex quadratic plus a concave term. Consequently, a Majorization-Minimization (MM) based approach from range measurements termed R-MM is proposed, which

In this letter, a novel robust block sparse recovery algorithm by using the weighted subspace fitting (WSF) is proposed to deal with the direction-of-arrival (DOA) problem under the condition of unknown mutual coupling. Firstly, a novel block sparse representation signal model based on the WSF is established to settle the effect of unknown mutual coupling. Then, the sparse constraint problem is investigated

In this letter, we propose a new method for two-dimensional (2-D) direction-of-arrival (DOA) estimation using two parallel nested arrays. In this method, an augmented covariance matrix is firstly constructed using the outputs of two parallel difference coarrays. Based on the augmented covariance matrix, the 2-D DOA estimation problem is then converted into two one-dimensional estimation problems. Finally

Channel estimation is very challenging for multiple-input and multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems in high mobility environments with non-stationarity channel characteristics. In order to handle this problem, we propose a deep learning (DL)-based MIMO-OFDM channel estimation algorithm. By performing offline training to the learning network, the channel state

Visible light positioning (VLP) systems can achieve high positioning precision. However, they are not compatible with visible light communication (VLC) systems. They require special positioning modules and could not reuse functional communication modules, while requiring more than two light emitting diodes (LEDs) to be deployed at user ends. In order to address the issues of weak compatibility and

Poor accuracy at low SNR makes fast autonomous wideband sensing in real-time difficult for cognitive radios. Support Vector Machines (SVM) can be an alternative in learning this sensing environment. But online training with conventional Eigen features has high complexity. This letter develops and validates on real-world data an efficient quick learning SVM-based blind sensing model using two new simple

In this letter, we propose a novel scheme extending index dimension with two distinct signal constellations, named as generalized spatial modulation with multi-index modulation (GSM-MIM). Through this scheme, which exploits the spatial domain and index domain, more extra information bits are transmitted by the spatial indexes as compared with the traditional GSM system. More specifically, with the

In this work, we first propose and demonstrate a bidirectional time-division-multiplexing (TDM) free space optical communication (FSO) traffic integrated in ring-based fiber access network together with fiber fault protection. Here, while we add the new designed optical devices in the central office (CO) and each optical wireless unit (OWU) respectively, the TDM-FSO fiber system can achieve the self-protected

Hybrid beamforming is a low-cost alternative to digital beamforming with its capability to operate with fewer radio frequency (RF) chains than antennas. However, the diminishing degree of freedom from utilizing fewer RF chains results in considerable performance degradation. To circumvent this setback, scheduling of energy harvesting (SEH) has been recently proposed to provide an additional degree

Parked vehicle assisted edge computing is a paradigm to employ parked vehicles for processing workloads in vehicular networks. They collaborate with edge servers for joint task execution within task deadline and parking durations. We study task assignment problem with Stackelberg game, where the overall cost of a task publisher in terms of monetary cost and subjective dissatisfaction caused by un-offloaded

This letter considers a multi-pair decode-and-forward relay network where a power-splitting (PS) protocol is adopted at the energy-constrained relay to provide simultaneous wireless information and energy harvesting (EH). To achieve higher efficiency of EH, we propose a new PS-based EH architecture at the relay by incorporating an alternating current (AC) computing logic, which is employed to directly

A full-duplex, amplify-and-forward multiple relay system employing simultaneous wireless information and power transfer receivers operating in interference channels is studied. Since all links want to maximize their own achievable rate, a power allocation problem under transmit power and energy harvesting constraints is developed. Through alternative optimization, a distributed iterative water-filling

This letter shows that optimizing the transmit powers along with judiciously designed nonorthogonal pilots can significantly reduce pilot contamination and improve the overall throughput of the uplink multi-cell massive multiple-input multiple-output (MIMO) system as compared to the conventional schemes that use orthogonal pilots. Given the optimized nonorthogonal pilots, power control as a function

This letter studies an ultra-reliable low latency communication problem focusing on a vehicular edge computing network in which vehicles either fetch and synthesize images recorded by surveillance cameras or acquire the synthesized image from an edge computing server. The notion of risk-sensitive in financial mathematics is leveraged to define a reliability measure, and the studied problem is formulated

Power control plays a significant role in cognitive networks, which promotes the spectrum sharing between heterogeneous systems. This letter presents the mathematical model for cognitive low earth orbit (LEO) satellite constellation with terrestrial networks, which takes the dynamic characteristics of the LEO satellite into consideration. Two optimal power control schemes are proposed from the long-term

Traffic congestion of a random access (RA) link can be resolved by clustering machine type communication devices (MTCDs) and using an aggregator. However, since a packet needs to wait in the aggregator, clustering may cause an additional delay. To solve this problem, this letter suggests a partially clustered access scheme (PCAS) in which direct-access MTCDs (dMTCDs) and clustered-access MTCDs (cMTCDs)

A direction-of-arrival (DOA) estimator is presented for statistically independent non-Gaussian and non-circular wideband signals in the presence of Gaussian noise (possibly spatially colored). With joint exploitation of non-Gaussianity and non-circularity of incident signals, enhanced aperture extension is achieved. The incorporation of the aligned biquaternion adjoint subspace augmentation and the

Hybrid precoding is an effective solution to reduce the cost of millimeter wave systems. In recent years, joint optimization has begun to attract the attention of researchers due to its excellent performance. In this letter, we adopt the alternating optimization method to design a low complexity hybrid precoding. In particular, the spectral efficiency optimization problems are simplified to sub-optimization

Beamforming structures with fixed beam codebooks provide economical solutions for millimeter wave (mmWave) communications due to the low hardware cost. However, the training overhead to search for the optimal beamforming configuration is proportional to the codebook size. To improve the efficiency of beam tracking, we propose a beam tracking scheme based on the channel fingerprint database, which comprises

The existence of inter-numerology interference (INI) is a major drawback for the flexible multi-numerology frame structure proposed for the upcoming fifth generation New Radio (5G-NR). Insertion of a guard band (GB) between adjacent numerologies has been widely used in the literature as one of the effective ways to reduce the INI. However, the conventional way of implementing GBs is inefficient in

In this letter, we propose a hybrid precoding design algorithm by utilizing RF chain selection to optimize the number of RF chains to achieve high energy efficiency (EE) with slightly spectral efficiency (SE) performance degradation. In this algorithm, we firstly reformulate the energy efficiency optimization problem, and resolve the hybrid precoding optimization problem with alternating minimization

Unmanned aerial vehicle (UAV) can act as flying base station to provide ground user (GU) with ubiquitous service in crowded or remote areas. The objective of this letter is to obtain the multi-UAV coverage scheme for maximizing the average capacity of UAV, while simultaneously ensuring that the deployed UAVs can cover all the massive or scattered GUs. We propose the dense boundary prioritized coverage

This work considers the problem of radio resource sharing between enhanced mobile broadband (eMBB) and ultra-reliable and low latency communications (URLLC), two heterogeneous 5G services. More specifically, we propose the use of a max-matching diversity (MMD) algorithm to properly allocate the channels to the eMBB users, considering both heterogeneous orthogonal multiple access (H-OMA) and heterogeneous

The Doppler spread in a highly dynamic environment leads to a large-scale channel variation over time for unmanned aerial vehicles (UAVs). In this letter, we adopt the high spatial resolution of massive multi-input multi-output (MIMO) technology to reduce the influence of Doppler spread. An algorithm is proposed for the asymptotically-optimal steering angle to achieve the longest virtual coherence

In this letter, we study the transmission of a multi-view video (MVV) to multiple users in an Orthogonal Frequency Division Multiple Access (OFDMA) system. To maximally improve transmission efficiency, we exploit both natural multicast opportunities and view synthesis-enabled multicast opportunities. First, we establish a communication model for transmission of a MVV to multiple users in an OFDMA system

Pilot contamination (PC) is a practical drawback of massive multiple-input multiple-output (mMIMO) systems. It prevents the exploitation of the inherent spectral-efficiency (SE) of mMIMO systems, especially in dense networks. In this letter, we consider multi-antenna users in a multi-cell network and propose a novel approach based on interference alignment (IA) to remove PC. We show that the extra

In this letter, we propose a dual-polarized precoding-aided spatial modulation (DPPSM) scheme, which introduces the polarization dimension into conventional precoding-aided spatial modulation (PSM) to transmit an additional information bit, avoiding the occupation of additional physical space while offering extra transmit diversity. We obtain an upper bound on the average bit error probability (ABEP)

In massive MIMO systems, the channel shows a spatial non-stationarity that has a significant impact on the design of sparse channel estimation scheme based on compressive sensing, due to the large size of antenna array. In this letter, the block matching pursuit (BMP)-based two-stage sparse channel estimation scheme is proposed for spatial non-stationary (SNS) channels. In this scheme, the BMP is introduced

We propose a successive relaying decode-and-forward protocol for the half-duplex 2-relay 2-destination multicarrier channel. The proposed protocol performs significantly better than existing protocols and achieves sum rates close to the cutset upper bound. We also prove that the linear program that describes the cutset upper bound for sum capacity is optimized using only 3 of the 4 possible states

The debate of using zero padding (ZP) instead of a cyclic prefix (CP) for enhancing channel estimation and equalization performance is a recurring topic. This is particularly true for orthogonal signals, such as orthogonal frequency division multiplexing (OFDM). Yet, there are far fewer studies evaluating the impact of ZP and CP in non-orthogonal systems. Such systems have the added complexity of self-induced

We study the performance optimization problem of the long term evolution (LTE) network operating in the unlicensed band and sharing it with an existing WiFi network. We consider the LTE network to be based on the frame-based listen-before-talk protocol. We formulate the joint channel assignment and channel occupancy time optimization problem using a stochastic integer programming (IP) model. By applying

There are two IEEE 802.11 mechanisms which enhance Wi-Fi network efficiency by lowering communication overhead: the legacy transmission opportunity (TXOP) limit and frame aggregation. According to the IEEE 802.11 standard, frame aggregation has priority over TXOP duration settings, in some cases completely overriding legacy behavior. Therefore, Wi-Fi vendors and administrators may resign from enabling

Presents a listing of the editorial board, board of governors, current staff, committee members, and/or society editors for this issue of the publication.

IEEE 802.11ay supports multi-user multiple-input-multiple-output (MU-MIMO). However, the MU-MIMO beam-forming training (BFT) is a time-consuming process for finding appropriate directional antenna patterns, and inefficient BFT results in a long training time. Thus, in this letter, we propose an algorithm that configures the transmit antenna with the aim of reducing the number of redundant transmissions

Several analytical models for the channel bonding feature of IEEE 802.11ac have previously been presented for performance estimation, but their accuracy has been limited by the assumptions that there are no collisions or all nodes are in saturated state. Therefore, in this letter, we develop an analytical model for the throughput performance of channel bonding in IEEE 802.11ac, considering the presence

This letter presents an optimal control framework to reduce the spread of viruses in networks. The network is modeled as an undirected graph of nodes and weighted links. We consider the spread of viruses in a network as a system, and the total number of infected nodes as the state of the system, while the control function is the weight reduction leading to slow/reduce spread of viruses. Our epidemic