Downlink performance and capacity of distributed antenna systems in a multicell environment

Choi, Wan; Andrews, Jeffrey G.

doi:10.1109/twc.2007.05207

Cited by 566 publications

(438 citation statements)

References 15 publications

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“…In contrast, the same area is covered by only a single high power base station in the traditional antenna systems. The actual number of distributed antenna modules would be determined by coverage, user densities and other environmental factors but we only consider three distributed antenna modules as a reasonable example [4]. If we expected not to change the shape of the hexagonal sector [8], three directional antennas (denoted by arrows) are placed at the corners and aiming at the Omni-directional antenna (denoted by circle) in the cell center as the figure above [6].…”

Section: Figure No 1: Antenna Deploymentmentioning

confidence: 99%

“…Where P is the total transmits power of the conventional base station and n is the number of antennas [4].all the four antennas have the same transmit power [6].…”

Section: Figure No 1: Antenna Deploymentmentioning

confidence: 99%

“…It consider this simple one for simplicity of analysis and since it should minimizing the required transmit power and hence the interference. This scheme is expected to additionally reduce other cell interference (OCI) because the number of OCI sources is reduced [4]. …”

mentioning

confidence: 99%

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Enhancement of Radio Link of Cellular Cell using multiple antennas

Agrawal¹,

Jaiswal²,

Nitin³

2013

IOSR-JECE

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Abstract:The mobile radio channel puts various limitations on the performance of wireless or mobile communications system. In wireless communications, the transmission path between the transmitter and receiver can vary from simple line-of-sight to one that is severely obstructed by buildings, mountains and foliage so high data rate services are highly required. In this paper, Distributed antenna system (DAS) is combined with the diversity characteristics in order to enhance the mobile radio channel also to get high data rate. Distributed antenna system (DAS) are traditionally deployed for the coverage purpose by replacing the single antenna of the traditionally cellular system with multiple antennas geographically separated within the cell and connected back to the main base station. Diversity is a powerful communication receiver technique that provides wireless link improvement at relatively low cost. The downlink scenarios for DAS with single antenna selection (SAS) and multiple antenna selection (MAS) have been reviewed also diversity technique which is applied through MIMO system is analyzed. According to the system level simulation, the cell signal to interference plus noise ratio, cell edge throughput and capacity of the system is improved by 35%, 82% and 75% respectively. Moreover, the total transmitted power can be reduced by 75%.

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Section: Figure No 1: Antenna Deploymentmentioning

confidence: 99%

“…Where P is the total transmits power of the conventional base station and n is the number of antennas [4].all the four antennas have the same transmit power [6].…”

Section: Figure No 1: Antenna Deploymentmentioning

confidence: 99%

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Enhancement of Radio Link of Cellular Cell using multiple antennas

Agrawal¹,

Jaiswal²,

Nitin³

2013

IOSR-JECE

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“…The topics include from capacity [6,7], joint processing [8][9][10], location optimization [11] to those considering the practical imperfect conditions such as backhaul constraints [12] and asynchronous interference [13].…”

Section: Related Studymentioning

confidence: 99%

“…As proved in [7], the optimal weight vector, which is necessary to maximize the receiving SNR, is obtained by phase steering:…”

Section: Independent Weight Vectormentioning

confidence: 99%

Joint resource allocations for remote radio head deployments with coherent transmitter

Wang

Shi

et al. 2012

J Wireless Com Network

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To deal with the future high demands of wireless traffic and energy consumption, one type of heterogeneous deployments is to distribute the base station antennas throughout the entire cell, which is called remote radio head (RRH). In view of radio resource management, the joint resource allocation in broadband orthogonal frequency division multiple access RRH (OFDMA-RRH) has not been thoroughly studied, which includes the antenna port selection, subcarrier assignment and power allocation under the power constraints per antenna port. This article focuses on the downlink resource allocation in OFDMA-RRH, where the coherent transmitter with phase steering is used. The problem to maximize the system spectrum efficiency (SE) is formulated, and solved by a dual decomposition method, where the decomposed sub-problems in the dual domain are solved by analytic geometry. In the optimal solution, the system power is always exhaustively used. As another contribution, this article further proposes that in the optimal solution, there is a considerable part of system power which makes little contribution to the SE and thus should be saved. Specifically, the energy efficiency is analyzed for an individual subcarrier transmission. A proportional power allocation (PPA) method is proposed to achieve a local optimality for each subcarrier. By applying the PPA to every subcarrier in order to maximize the system SE, a new resource allocation problem is formulated and solved. Discussions are also presented for the proposed algorithms on the computational complexity and feasibility in multi-cell cases. Simulation results show that the optimal algorithm consumes all the system power and has good convergence. The algorithm applying PPA can effectively improves the system power efficiency while achieving the SE optimality.

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2012

Resource Allocation in Uplink OFDMA Wireless Systems

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Downlink performance and capacity of distributed antenna systems in a multicell environment

Cited by 566 publications

References 15 publications

Enhancement of Radio Link of Cellular Cell using multiple antennas

Enhancement of Radio Link of Cellular Cell using multiple antennas

Joint resource allocations for remote radio head deployments with coherent transmitter

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