Measurement‐based analysis of cross‐layer adaptation for MIMO in mobile urban environments
The performance of mobile multiple‐input–multiple‐output (MIMO) systems is determined both by the instantaneous channel characteristics and by the rate of change of those characteristics. The local environment and operating frequency affect the spatial ...
Successive orthogonal beamforming for cooperative multi‐point downlinks
This study considers successive orthogonal beamforming (SOBF) for multicell downlink transmissions. A group of base stations (BSs) are in cooperation for effective downlink transmissions to cell‐edge users, which is usually referred to as cooperative ...
Integer linear programming model and satisfiability test reduction for distance constrained labellings of graphs: the case of L(3,2,1)labelling for products of paths and cycles
Let u and v be vertices of a graph G = (V, E) and d(u, v) be the distance between u and v in G. For positive integers k1, k2, …, kn with k1>k2>⋯>kn an L(k1, k2, …, kn)‐labelling of G is a function f: V(G)→{0, 1, …} such that for every u, v ∈ V(G) and for ...
Physical‐layer transceiving techniques on data‐aided orthogonal frequency‐division multiplexing towards seamless service on vehicular communications
Frequency error, non‐ideal channel estimation (CE) and inefficient seamless road side unit (RSU) service are critical issues occurring in conventional systems that are completely specified by current IEEE 802.11p standards. This study investigates novel ...
Secondary user access based on stochastic link estimation in cognitive radio with fibre‐connected distributed antennas
In this study, the authors consider the application of a system architecture called cognitive radio (CR) with fibre‐connected distributed antennas in IEEE 802.22 wireless regional area networks (WRANs) as it could bring the benefits of much shorter ...
Effect of avalanche photodiode and thermal noises on the performance of binary phase‐shift keying‐subcarrier‐intensity modulation/free‐space optical systems over turbulence channels
In this study, the authors theoretically study the performance of direct‐detection free‐space optical communication systems using binary phase‐shift keying subcarrier‐intensity modulation and avalanche photodiode (APD). The system bit‐error rate and ...
Capacity analysis of Rayleigh fading channels in low signal‐to‐noise ratio regime for maximal ratio combining diversity because of combining errors
In this research work, the authors derive closed‐form expressions for capacity per unit bandwidth (spectrum efficiency) of correlated Rayleigh fading channels under maximal ratio combining diversity at low signal‐to‐noise ratios (SNRs). Spectrum ...
Spatially‐coupled communication system for the correlated erasure channel
Low implementation complexity, low delay and close‐to‐optimal performance over a wide variety of channels are some of the advantages of spatially‐coupled low‐density parity‐check (LDPC) codes. However, the error performance of the sliding window decoding ...
Estimating communication costs for distributed XML query processing
In distributed query processing, good estimation algorithms of communication costs are critical for query processing, including distributed XML queries. There are techniques that estimate a communication cost for distributed SQL query processing, and some ...
Low‐complexity selected mapping scheme using cyclic‐shifted inverse fast Fourier transform for peak‐to‐average power ratio reduction in orthogonal frequency division multiplexing systems
In this study, a new peak‐to‐average power ratio (PAPR) reduction scheme for orthogonal frequency division multiplexing (OFDM) is proposed based on the selected mapping (SLM) scheme. The proposed SLM scheme generates alternative OFDM signal sequences by ...
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