A Comparative Analysis of Spatial Multiplexing Techniques for Outdoor MIMO-OFDM Systems with a Limited Feedback Constraint

In this paper, we analyze spatial multiplexing techniques for the downlink of a multiple-input-multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) system. Our study is focused on outdoor environments characterized by a moderate angular spread. We consider two techniques that are...

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Bibliographic Details
Published in:IEEE transactions on vehicular technology Vol. 58; no. 1; pp. 218 - 230
Main Authors: Savazzi, S., Nicoli, M., Sternad, M.
Format: Journal Article
Language:English
Published: New York, NY IEEE 01.01.2009
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Adaptive arrays
Adaptive systems
Applied sciences
Base stations
Channels
Circuit properties
Coding, codes
Comparative analysis
Downlink
Electric, optical and optoelectronic circuits
Electrical Engineering with specialization in Signal Processing
Electronic circuits
Electronics
Elektroteknik med inriktning mot signalbehandling
Error probability
Exact sciences and technology
Feedback
Frequency division multiplexing
Information technology
Information, signal and communications theory
Informationsteknik
MIMO
MIMO-OFDM systems
Modulation
Modulation coding
Multiplexing
multiuser diversity
OFDM
Organization and planning of networks (techniques and equipments)
Orthogonal Frequency Division Multiplexing
Outdoor
Policies
Signal and communications theory
Signal convertors
Signal processing
Signalbehandling
spatial multiplexing
Spreads
Studies
Systems, networks and services of telecommunications
TECHNOLOGY
TEKNIKVETENSKAP
Telecommunications
Telecommunications and information theory
Throughput
zero-forcing beamforming
Performance evaluation
Error probability
Outdoor installation
Information rate
Feedback regulation
Downlink
Spatial multiplexing
zero-forcing beamforming
Metropolitan area network
Three dimensional structure
IEEE standards
Adaptive modulation
Modulation coding
Antenna
MIMO system
MIMO-OFDM systems
multiuser diversity
Coding circuit
Channel structure
Scheduling
Information transmission
Adaptive coding
Orthogonal frequency division multiplexing
Planning
Comparative study
ISSN:0018-9545, 1939-9359, 1939-9359
Online Access:Get full text
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Summary:In this paper, we analyze spatial multiplexing techniques for the downlink of a multiple-input-multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) system. Our study is focused on outdoor environments characterized by a moderate angular spread. We consider two techniques that are able to separate the downlink data streams associated with different users and to guarantee a fixed error probability by exploiting limited feedback from each user. The grid of beams (GoBs) and the proposed adaptive GoB (AGoB) differ in the way the precoders are designed (by adaptive or fixed processing) and in their scheduling policy. The new AGoB is able to harness partial knowledge of the downlink channel spatial structure to better select the users and adjust their precoders for downlink transmission. The performances of GoB and AGoB are compared in this paper in terms of throughput and cell coverage capability. The radio interface is adapted to fit the requirements for the adaptive modulation and coding with advanced antenna system (AMC-AAS) mode of the IEEE 802.16-2005 standard. Numerical results show that, as long as the channel exhibits a limited angular spread at the base station, the AGoB technique is able to provide significant throughput gains compared with the fixed GoB approach. On the other hand, large angular spreads are proved to have a substantial impact on system performance as the benefits of adaptation are significantly reduced.
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ISSN:0018-9545
1939-9359
1939-9359
DOI:10.1109/TVT.2008.920474