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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| Vydané v: | IEEE transactions on vehicular technology Ročník 58; číslo 1; s. 218 - 230 |
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| Hlavní autori: | , , |
| Médium: | Journal Article |
| Jazyk: | English |
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New York, NY
IEEE
01.01.2009
Institute of Electrical and Electronics Engineers The Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
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| ISSN: | 0018-9545, 1939-9359, 1939-9359 |
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| Abstract | 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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| AbstractList | 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 [abstract truncated by publisher]. 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. 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. |
| Author | Sternad, M. Nicoli, M. Savazzi, S. |
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| Keywords | 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 |
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| Snippet | In this paper, we analyze spatial multiplexing techniques for the downlink of a multiple-input-multiple-output (MIMO) orthogonal frequency-division... 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... In this paper, we analyze spatial multiplexing techniques for the downlink of a multiple-input-multiple-output (MIMO) orthogonal frequency- division... |
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| SubjectTerms | 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 |
| Title | A Comparative Analysis of Spatial Multiplexing Techniques for Outdoor MIMO-OFDM Systems with a Limited Feedback Constraint |
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