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In this paper, we consider the rate maximization of a new cognitive ratio (CR) scenario when multiple primary users (PU) are operating under the simultaneous wireless information and power transfer (SWIPT) mode. Since the rate maximization problem is NP-hard, we separate the derivation approach into the following two steps: (i) we prove that the optimal transmit covariance is of rank-one; (ii) we...
The issue of binary data detection under subsampling condition is addressed in this work. Through convex relaxation, the original combinatorial optimization problem is transformed to an ℓ∞ minimization problem which can be efficiently solved by ℓp approximation algorithm with sufficiently large p. Theoretical analysis and simulations indicate that when the number of sampled signals is around half...
In the design of Wireless Mesh Network (WMN) for small cell backhaul, deployment cost and reliability are important considerations and are mainly determined by network topology. Reliability ensures the network quality for clients and cost is a major concern in telecom operators. In practice, increasing redundant network links improves the reliability of a backhaul network, but increases the cost substantially...
With the increase of physical antenna and subcarrier numbers in MIMO-OFDM systems, the signal precoding complexity overburden and channel side information feedback amount would become enormous and intolerable. To solve this problem, previous works mainly focused on fixed subcarrier grouping size and MIMO precoded signals in the same group. It could reduce the system overburden, but such a process...
Hardware impairments of physical transceivers that create distortions degrade the performance of communication. This paper analyzes the performance with different relay selections which include partial relay selection and opportunistic relay selection in amplify-and-forward (AF) cooperative network with hardware impairments. Partial relay selection is that the relay node is selected depending on the...
The Nakagami-m distributions is very useful for modeling radio links and characterizing the envelop distribution over different fading channels due to multipath fading in wireless communications. Robust and accurate estimation of m is very useful and necessary in many applications. The problem of estimating parameter m of Nakagami-m distribution in noisy environment is considered in this paper. Unlike...
In this presentation, a novel orthogonal frequency division multiplexing (OFDM) scheme, which is called OFDM with index modulation (OFDM-IM), is proposed for frequency-selective fading and fast timer-varying channels. In this scheme, inspiring from the recently introduced spatial modulation concept for multiple-input multiple-output (MIMO) channels, the information is conveyed not only by M-ary signal...
In this paper, a differential space-time coding (D-STC) scheme is presented for relay assisted cooperative wireless communication networks over frequency selective fading channels. Two most common schemes, i.e., differential amplify-and-forward (DAF) and differential decode-and-forward (DDF), are both investigated in our single relay assisted system. Leveraging spectral encoder and differential space-time...
Today amounts of wireless networks have made the ambient radio frequency signals around the world. Wireless information and power transfer make it possible for the devices to cyclically use the energy from these surrounding signals and process information simultaneously. In this paper, we study the wireless information and power transfer protocol using the energy harvesting relay in a two-way amplify-and-forward...
Device-to-Device (D2D) communication as a resource reuse technique underlaying TV white space (TVWS) can bring significant potential benefits. In this paper, we address the coexistence between primary TV receiver and multiple D2D links as well as coexistence among different D2D links in a cell. Relying on geo-location database, the access point coordinates channel allocation for D2D links and regulate...
Under the high mobility scenario, some factors have a strong influence on LTE system performance such as the velocity of mobile user, pilot patterns, multiple-input-multiple-output (MIMO) transmission strategies, wireless channel characteristics, etc. The doppler shift or spread due to the user velocity will not only cause the inter-carrier-interference (ICI) for orthogonal frequency division multiplexing...
With the fast deployment of high-speed railways of more than 300 km/h, providing quality of service of multimedia applications for users in the train is a key issue in wireless communications. The more challenging problem rests on the need to trade-off two performance metrics: the handover call dropping probability and the new call blocking probability. In this paper, we propose some prioritized access...
Underdetermined inverse sparse signal reconstruction problems in the presence of non-Gaussian noise interference are often encountered in high-mobility wireless communications and signal processing. These problems can be solved by finding the minimizer of a suitable objective function which consists of a data-fitting term and a regularization term with different mixed-norms. Based on the Gaussian-noise...
High mobility introduces significant Doppler frequency spread and hence imposes great challenge to channel estimation in orthogonal frequency division multiplexing (OFDM) systems. In this paper, we propose a new low coherence compressed channel estimation method for OFDM systems in the high mobility environment. Based on the compressed sensing (CS) coherence minimization criterion, we propose a new...
Reed-Solomon convolutional concatenated (RSCC) codes have been widely used in wireless and space communications. Turbo decoding of the concatenated code has been recently developed and shown that the code's error-correction capability can be significantly improved. Particularly, turbo decoding of RSCC codes yields a competent performance when the codeword length is limited. This makes the code a very...
This paper investigates the resource allocation schemes for Voice over Internet Protocol (VoIP) traffic under high speed train scenario, in which 2-state VoIP traffic model based on Markov chain is considered. Unlike the full-buffer traffic, in which the transmitter buffer is always full of data to be transmitted, VoIP traffic can be characterized by small packets in regular intervals with tight delay...
The outage behavior of a dual-hop multi-source multi-relay cooperative communication network is investigated. With the presence of multiple cochannel interferers at both the relays and destination, we propose a signal-to-interference-plus-noise ratio based scheme for the combined use of cooperative diversity and multiuser diversity. Firstly, the best source node with the highest direct-link signal-to-interference-plus-noise...
Adaptive modulation and coding (AMC) transmission of wireless communications requires accurate channel state information (CSI) to select the suitable transmission mode. However, the accurate CSI is hard to be obtained for high-speed railway (HSR) communications due to the fast time-varying fading channel, which strictly limits the performance of HSR with AMC transmission. Recent studies show that...
In this paper, we propose a statistics-based channel estimation and inter-carriers interference (ICI) mitigation scheme for the orthogonal frequency division multiplexing (OFDM) transmission over high speed railway communication. The proposed scheme offers a new channel estimation method based on compressed sensing by utilizing the sparsity of high speed train (HST) in the time domain channel. The...
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