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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...
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...
Current interest in the millimeter wave technology is motivated by both old and new factors. Over the past decade, regulators have allocated up to 9 GHz of Spectrum near 60 GHz for license-exempt world-wide use. The emergence of numerous high-speed applications, including uncompressed HDTV, uncompressed multi-video streaming, very high-speed -file downloading and now potential use in wireless access...
This talk is concerned with an uplink scheme for multi-cell large antenna systems. We study a channel estimation technique where partially decoded data is used to estimate the channel. We show that there are two types of interference components in this scheme that do not vanish even when the number of antennas grows to infinity. The first type, referred to as cross-contamination, is due to the correlation...
In high-speed train wireless communication systems, the underlying channels are essentially non-stationary due to fast-varying channel conditions. For the design, performance evaluation, and optimization of high-speed train wireless communication systems, it is a prerequisite to develop non-stationary channel models with time-varying small-scale fading parameters. In this talk, we propose novel non-stationary...
Due to the high speed of the HSTs (high speed trains), Doppler shift estimation is a big challenge for OFDM (Orthogonal Frequency Division Multiplexing) based LTE-R (LTE based communication systems for high speed Rail), which is very sensitive to Doppler shifts. Exploiting the unique feature of HSTs, i.e. they move along a given railway, resulting in a regular, repetitive and predictable Doppler shift...
A location-aware channel estimation algorithm is proposed for massive multiinput multi-output (MIMO) systems, to reduce the inter-cell interference caused by pilot contamination. Specifically, by utilizing the property of the steering vector, a fast Fourier transform based post-processing is introduced after the conventional pilot-aided channel estimation for mitigating pilot contamination, which...
This paper studies the performance and design of high speed railway (HSR) communication systems that employ a large number of antennas at both the transmitter and receiver. User onboard a train communicate with the BS by using distributed antennas mounted on top of the train as a gateways. One of the main challenges in HSR system design is the fast time-varying fading, the estimation and tracking...
Vehicular ad hoc networks (VANETs) have aroused wide public attention over the recent years. This paper presents a social-aware routing algorithm based on fuzzy logic algorithm, which aims at improving the data packet delivery ratio and reducing end-to-end delay. In the road, nodes use greedy algorithm with cache mechanism to select next hop, which means that neighbor node which is closest to the...
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...
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...
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...
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...
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...
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...
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