Interference suppression in TDD/CDMA cellular systems with asymmetric traffic using MVDR beamforming

Chiung Jang Chen; Li-Chun Wang

doi:10.1109/VETECF.2002.1040319

Interference suppression in TDD/CDMA cellular systems with asymmetric traffic using MVDR beamforming

Chiung Jang Chen^*
, Li-Chun Wang

^*Corresponding author for this work

Department of Electrical and Computer Engineering

Research output: Contribution to journal › Conference article › peer-review

4 Scopus citations

Abstract

The primary advantage of the TDD system is to accommodate asymmetric traffic by allocating different numbers of uplink and downlink time slots. However, in the TDD/CDMA cellular system, uplink signals may suffer strong interference from the downlink transmission of neighboring base stations. This kind of opposite direction interference has adverse impact on the TDD/CDMA system performance. In this paper, we propose to apply the MVDR beamforming technique to suppress the opposite direction interference. We evaluate the uplink performance of the proposed technique by simulation. Moreover, by jointly employing transmit beamforming in all asynchronous cells, the TDD/CDMA cellular system can allow different rates of asymmetry in different cells. Thus, each cell can design its own pattern of slot allocation.

Original language	English
Article number	1040319
Pages (from-to)	141-145
Number of pages	5
Journal	IEEE Vehicular Technology Conference
Volume	56
Issue number	1
DOIs	https://doi.org/10.1109/VETECF.2002.1040319
State	Published - 24 Sep 2002
Event	56th Vehicular Technology Conference - Vancouver, BC, Canada Duration: 24 Sep 2002 → 28 Sep 2002

Keywords

Antenna arrays
MVDR beamforming
TDD/CDMA system
Transmit beamforming

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10.1109/VETECF.2002.1040319

Cite this

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title = "Interference suppression in TDD/CDMA cellular systems with asymmetric traffic using MVDR beamforming",

abstract = "The primary advantage of the TDD system is to accommodate asymmetric traffic by allocating different numbers of uplink and downlink time slots. However, in the TDD/CDMA cellular system, uplink signals may suffer strong interference from the downlink transmission of neighboring base stations. This kind of opposite direction interference has adverse impact on the TDD/CDMA system performance. In this paper, we propose to apply the MVDR beamforming technique to suppress the opposite direction interference. We evaluate the uplink performance of the proposed technique by simulation. Moreover, by jointly employing transmit beamforming in all asynchronous cells, the TDD/CDMA cellular system can allow different rates of asymmetry in different cells. Thus, each cell can design its own pattern of slot allocation.",

keywords = "Antenna arrays, MVDR beamforming, TDD/CDMA system, Transmit beamforming",

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journal = "IEEE Vehicular Technology Conference",

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T1 - Interference suppression in TDD/CDMA cellular systems with asymmetric traffic using MVDR beamforming

AU - Chen, Chiung Jang

AU - Wang, Li-Chun

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N2 - The primary advantage of the TDD system is to accommodate asymmetric traffic by allocating different numbers of uplink and downlink time slots. However, in the TDD/CDMA cellular system, uplink signals may suffer strong interference from the downlink transmission of neighboring base stations. This kind of opposite direction interference has adverse impact on the TDD/CDMA system performance. In this paper, we propose to apply the MVDR beamforming technique to suppress the opposite direction interference. We evaluate the uplink performance of the proposed technique by simulation. Moreover, by jointly employing transmit beamforming in all asynchronous cells, the TDD/CDMA cellular system can allow different rates of asymmetry in different cells. Thus, each cell can design its own pattern of slot allocation.

AB - The primary advantage of the TDD system is to accommodate asymmetric traffic by allocating different numbers of uplink and downlink time slots. However, in the TDD/CDMA cellular system, uplink signals may suffer strong interference from the downlink transmission of neighboring base stations. This kind of opposite direction interference has adverse impact on the TDD/CDMA system performance. In this paper, we propose to apply the MVDR beamforming technique to suppress the opposite direction interference. We evaluate the uplink performance of the proposed technique by simulation. Moreover, by jointly employing transmit beamforming in all asynchronous cells, the TDD/CDMA cellular system can allow different rates of asymmetry in different cells. Thus, each cell can design its own pattern of slot allocation.

KW - Antenna arrays

KW - MVDR beamforming

KW - TDD/CDMA system

KW - Transmit beamforming

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DO - 10.1109/VETECF.2002.1040319

M3 - Conference article

AN - SCOPUS:0036445643

SN - 0740-0551

VL - 56

SP - 141

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JO - IEEE Vehicular Technology Conference

JF - IEEE Vehicular Technology Conference

IS - 1

M1 - 1040319

T2 - 56th Vehicular Technology Conference

Y2 - 24 September 2002 through 28 September 2002

ER -

Interference suppression in TDD/CDMA cellular systems with asymmetric traffic using MVDR beamforming

Abstract

Keywords

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