Reduced feedback opportunistic and layered random beamforming for MIMO-OFDMA systems

C Han; M Nicolaou; A Doufexi; SMD Armour

Reduced feedback opportunistic and layered random beamforming for MIMO-OFDMA systems

C Han
, M Nicolaou
, A Doufexi
, SMD Armour

Communication Systems and Networks

Research output: Chapter in Book/Report/Conference proceeding › Conference Contribution (Conference Proceeding)

251 Downloads (Pure)

Abstract

This paper considers a number of techniques employed in opportunistic and layered random beamforming OFDMA schemes that aim to reduce the feedback required to perform scheduling whilst also minimising the throughput degradations resulting from this reduced throughput (due to the lack of full CSI at the Base Station (BS). Frequency response correlation among subcarriers can be exploited to group adjacent subcarriers into clusters which can then be treated as a single unit for feedback purposes to reduce the total amount of feedback. Given that these grouped subcarriers are highly correlated, good throughput performance can be preserved. In addition, it is possible to schedule clusters of size greater that 1 with a single feedback bit per cluster, achieving the same rate growth as a full CSI aware scheme. The idea of transmitting multiple weights to increase diversity has also been developed for an OFDM/OFDMA scenario where different clusters pick different weighting vectors for transmission, resulting in an overall throughput increase at the expense of only a minor increase in feedback information.

Translated title of the contribution	Reduced feedback opportunistic and layered random beamforming for MIMO-OFDMA systems
Original language	English
Title of host publication	IET Seminar on Smart Antennas and Coooperativve Communication, London
Publisher	Institution of Engineering and Technology (IET)
Publication status	Published - 22 Oct 2007
Event	IET Seminar on Smart Antennas and Cooperative Communication - London, United Kingdom Duration: 22 Oct 2007 → …

Conference

Conference	IET Seminar on Smart Antennas and Cooperative Communication
Country/Territory	United Kingdom
City	London
Period	22/10/07 → …

Bibliographical note

Conference Proceedings/Title of Journal: IET Seminar on Smart Antennas and Coooperativve Communication
Rose publication type: Conference contribution

Additional information: With accompanying conference presentation

Sponsorship: The authors wish to acknowledge the financial support of Toshiba Research Europe Limited (TREL) and DHPA and EPSRC

Terms of use: This is a postprint of a paper submitted to and accepted for publication in IET Seminar on Smart Antennas and Cooperative Communication, and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library

Keywords

opportunistic beamforming
MIMO-OFDMA
frequency correlation
multiple weights
1 bit feedback

Access to Document

Conference paperAccepted author manuscript, 199 KB
Accompanying conference presentationAccepted author manuscript, 281 KB

Handle.net

Persistent link

Cite this

@inproceedings{a42fed2a07694632b6bcbf4f4bd36cc9,

title = "Reduced feedback opportunistic and layered random beamforming for MIMO-OFDMA systems",

abstract = "This paper considers a number of techniques employed in opportunistic and layered random beamforming OFDMA schemes that aim to reduce the feedback required to perform scheduling whilst also minimising the throughput degradations resulting from this reduced throughput (due to the lack of full CSI at the Base Station (BS). Frequency response correlation among subcarriers can be exploited to group adjacent subcarriers into clusters which can then be treated as a single unit for feedback purposes to reduce the total amount of feedback. Given that these grouped subcarriers are highly correlated, good throughput performance can be preserved. In addition, it is possible to schedule clusters of size greater that 1 with a single feedback bit per cluster, achieving the same rate growth as a full CSI aware scheme. The idea of transmitting multiple weights to increase diversity has also been developed for an OFDM/OFDMA scenario where different clusters pick different weighting vectors for transmission, resulting in an overall throughput increase at the expense of only a minor increase in feedback information.",

keywords = "opportunistic beamforming, MIMO-OFDMA, frequency correlation, multiple weights, 1 bit feedback",

author = "C Han and M Nicolaou and A Doufexi and SMD Armour",

note = "Conference Proceedings/Title of Journal: IET Seminar on Smart Antennas and Coooperativve Communication Rose publication type: Conference contribution Additional information: With accompanying conference presentation Sponsorship: The authors wish to acknowledge the financial support of Toshiba Research Europe Limited (TREL) and DHPA and EPSRC Terms of use: This is a postprint of a paper submitted to and accepted for publication in IET Seminar on Smart Antennas and Cooperative Communication, and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library ; IET Seminar on Smart Antennas and Cooperative Communication ; Conference date: 22-10-2007",

year = "2007",

month = oct,

day = "22",

language = "English",

booktitle = "IET Seminar on Smart Antennas and Coooperativve Communication, London",

publisher = "Institution of Engineering and Technology (IET)",

address = "United Kingdom",

}

Han, C, Nicolaou, M, Doufexi, A & Armour, SMD 2007, Reduced feedback opportunistic and layered random beamforming for MIMO-OFDMA systems. in IET Seminar on Smart Antennas and Coooperativve Communication, London. Institution of Engineering and Technology (IET), IET Seminar on Smart Antennas and Cooperative Communication, London, United Kingdom, 22/10/07. <http://hdl.handle.net/1983/1781>

TY - GEN

T1 - Reduced feedback opportunistic and layered random beamforming for MIMO-OFDMA systems

AU - Han, C

AU - Nicolaou, M

AU - Doufexi, A

AU - Armour, SMD

N1 - Conference Proceedings/Title of Journal: IET Seminar on Smart Antennas and Coooperativve Communication Rose publication type: Conference contribution Additional information: With accompanying conference presentation Sponsorship: The authors wish to acknowledge the financial support of Toshiba Research Europe Limited (TREL) and DHPA and EPSRC Terms of use: This is a postprint of a paper submitted to and accepted for publication in IET Seminar on Smart Antennas and Cooperative Communication, and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library

PY - 2007/10/22

Y1 - 2007/10/22

N2 - This paper considers a number of techniques employed in opportunistic and layered random beamforming OFDMA schemes that aim to reduce the feedback required to perform scheduling whilst also minimising the throughput degradations resulting from this reduced throughput (due to the lack of full CSI at the Base Station (BS). Frequency response correlation among subcarriers can be exploited to group adjacent subcarriers into clusters which can then be treated as a single unit for feedback purposes to reduce the total amount of feedback. Given that these grouped subcarriers are highly correlated, good throughput performance can be preserved. In addition, it is possible to schedule clusters of size greater that 1 with a single feedback bit per cluster, achieving the same rate growth as a full CSI aware scheme. The idea of transmitting multiple weights to increase diversity has also been developed for an OFDM/OFDMA scenario where different clusters pick different weighting vectors for transmission, resulting in an overall throughput increase at the expense of only a minor increase in feedback information.

AB - This paper considers a number of techniques employed in opportunistic and layered random beamforming OFDMA schemes that aim to reduce the feedback required to perform scheduling whilst also minimising the throughput degradations resulting from this reduced throughput (due to the lack of full CSI at the Base Station (BS). Frequency response correlation among subcarriers can be exploited to group adjacent subcarriers into clusters which can then be treated as a single unit for feedback purposes to reduce the total amount of feedback. Given that these grouped subcarriers are highly correlated, good throughput performance can be preserved. In addition, it is possible to schedule clusters of size greater that 1 with a single feedback bit per cluster, achieving the same rate growth as a full CSI aware scheme. The idea of transmitting multiple weights to increase diversity has also been developed for an OFDM/OFDMA scenario where different clusters pick different weighting vectors for transmission, resulting in an overall throughput increase at the expense of only a minor increase in feedback information.

KW - opportunistic beamforming

KW - MIMO-OFDMA

KW - frequency correlation

KW - multiple weights

KW - 1 bit feedback

M3 - Conference Contribution (Conference Proceeding)

BT - IET Seminar on Smart Antennas and Coooperativve Communication, London

PB - Institution of Engineering and Technology (IET)

T2 - IET Seminar on Smart Antennas and Cooperative Communication

Y2 - 22 October 2007

ER -

Reduced feedback opportunistic and layered random beamforming for MIMO-OFDMA systems

Abstract

Conference

Bibliographical note

Keywords

Access to Document

Handle.net

Fingerprint

Cite this