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By combining the polarized modulation and the spatial modulation technique, dual-polarized spatial modulation (DPSM) has been recently proposed for MIMO transmission to improve the spectral efficiency and reduce the space occupancy. The performance of DPSM over correlated Rayleigh and Rice fading channels has been studied, showing that DPSM technique outperforms uni-polarized SM technique. For a general...
The massive demand of mobile data traffic stimulates the emergence of cache-enabled heterogeneous cellular networks (HetNets). Caching at the network edge can reduce the duplicated transmissions of the contents and improve users' quality of service (QoS), however, the dense deployment of cache-enabled small base stations (SBSs) and relays poses a challenge on energy consumption. Several emerging technologies...
Understanding user behavior is essential for source optimization in mobile networks, including urban planning, road traffic engineering, and content distribution. In this paper, we take the first step to investigate the basic characterization of user behavior over 340,000 users of a 4G mobile network in a large metropolitan area. Our study is carried on from two aspects: mobility and application usage...
For simulations of multiple-input multiple-output (MIMO) narrowband channel between the Unmanned Aerial Vehicle (UAV) and the ground user, we describe the distribution of scatterers by using a cylindrical model, and propose a corresponding deterministic simulation model and a statistical simulation model. In order to verify the practicability of the simulation model, this paper compares the temporal...
In the 3D massive MIMO system, both the transmitter encoding and the receiver signal detection require channel state information. The accuracy of channel state information will directly affect the overall performance of the system. Therefore, accurate channel estimation is the key to reliable communication in the 3D massive MIMO system. Due to the channel sparsity of 3D massive MIMO, existing works...
Supporting diverse services under a unified system is a major concern for the realization in the fifth generation (5G) cellular networks. In 5G systems, the massive connection property of massive machine-type communications (mMTC) results in the huge demand of physical downlink control channel (PDCCH) resources. Furthermore, greater overhead of PDCCH is indispensable for ultra-reliable downlink transmission...
Simultaneous wireless information and power transfer (SWIPT) is an effective way for energy-constrained unmanned aerial vehicle (UAV) to prolong the network lifetime. In this paper, an amplify and forward (AF) relaying network is considered, where an energy-constrained UAV harvests energy and information simultaneously from base station and then transmits the information to the destination node. Based...
In next generation cellular networks, small cell base stations (BSs) with ultra-dense deployments are likely to cooperate together to manage interference and provide users with high data rates. But users may still experience large drops in throughput due to lack of available resources even with high received signal strength. In this paper, we propose a congestion-aware user-centric cooperative BS...
A universal design methodology for inter-leavers in bit-interleaved coded modulation (BICM) systems deploying binary irregular quasi-cyclic low-density parity-check (QC-LDPC) codes and higher-order modulation is presented. The interleaver is introduced to lower decoding threshold when higher-order modulation is adopted. For this purpose, an optimization procedure with modified numerical analysis as...
With the rapid development of 100Gbit/s technology and its increased commercial applications, various different type of 100G optical transceiver modules have been designed and widely used, which leads to the difficulties of achieving interconnection between 100G switch or router due to their different optical interfaces. On the other hand, in order to increase the port density of 100G switch or router,...
According to the prior knowledge used in the algorithms, NMF-based speech enhancement can be categorized into supervised (NMF) one and semi-supervised (SNMF) one. In the supervised version, speech is estimated with the prior knowledge of both speech and noise. For the semi-supervised version, speech bases are learned on clean speech data in advance and adapted to different noise conditions. With the...
Distributed detection without fusion center (FC) allows each sensor node to exchange measurements with its neighbors and to reach agreement on the existence of the target using the consensus algorithm. Comparing with the centralized system, the decentralized system has better performance, in terms of robustness, scalability and invulnerability. Due to the decentralized and open properties, the security...
Benefiting from compressed sensing theory, sub-Nyquist spectrum sensing (SNSS) has been considered as a promising way to deal with the implementation limitations of conventional wideband spectrum sensing in cognitive radio (CR) networks. However, in most existing SNSS methods, the prior knowledge of the monitored frequency bands is needed to determine the termination condition of the iteration process...
A novel algorithm is proposed for the direction-of-arrival (DOA) estimation of coherently distributed (CD) sources. Based on the symmetric property of the uniform linear array (ULA) geometry, the DOA can be estimated by a one-dimensional peak search without estimating the distribution parameters, where N independent CD sources can be distinguished with a ULA of 2N + 1 elements. Compared with the existing...
Pulse position modulation (PPM) is widely employed in free-space optical (FSO) communication systems owing to its high power efficiency. Recently, a coding scheme called Block Markov superposition transmission (BMST) is proposed with a predictable performance lower bound and the ability to approach the Shannon limit. In this paper, we present the BMST coded PPM scheme with iterative receiver to improve...
Recently, a novel direct current-biased optical filter bank multi-carrier (DCO-FBMC) scheme has been proposed for optical wireless communication (OWC) in intensity modulation and direct detection channel. Although the DCO-FBMC scheme supports fully asynchronized multi-user uplink transmission and has been proven to have higher spectral and power efficiency than direct current biased optical orthogonal...
Ambient backscatter is a new technology that utilizes environmental wireless signals to enable battery-free devices to communicate with each other. In this paper, we investigate the problem of signal detection for the full duplex wireless system utilizing ambient backscatter. Since one of the key technologies of full duplex wireless system is self-interference cancellation, we first estimate the channel...
In this paper, we propose a novel QoE-driven centralized scheduling framework to satisfy the differentiated quality of experience (QoE) requirements of cellular users for HTTP-based video streaming transmission. The framework jointly considers the comprehensive information from the video server side (video coding rates and QoE parameters), the user side (video playback buffer occupancy), and the time-varying...
In this paper, we investigate the power allocation algorithm for beam division multiple access (BDMA) transmission in massive multiple-input multiple-output (MIMO) communications under Rician fading. Based on the fact that eigenbasis at the base station (BS) become identical and independent of user equipment as the number of BS antennas goes to infinity, jointly correlated channel model is introduced...
The next generation cellular networks are predicted to face the challenge of massive data transmission originated from Machine Type Communication (MTC) devices with limited communication resources. The main objective of this paper is to reduce communication resources consumption in acceptable transmission latency for massive data generated from MTC devices. As an attempt to solve this challenge, a...
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