Optimal transmission scheme for a distributed antenna in CDMA system

F Tong, I A Glover, S R Pennock, P R Shepherd

Research output: Contribution to conferencePaper

Abstract

Distributed antenna diversity employs separately installed, but cooperating, antennas within a single base-station; it has been proved that the uplink capacity (per cell) in terms of maximum achievable SIR (signal-to-interference ratio) is linear with the number of deployed antenna units. While in the downlink, because of the multiple-to-one propagation topology, equal power (transmission power at each antenna) allocation (providing equal SIR) in the base-station results in fixed SIR at the mobile terminal, irrespective of the number of base-station antennas used. A transmission scheme, using optimal power allocation and SIR-balanced power control, is proposed to increase the SIR by exploiting multiple base-station antennas. The downlink diversity (called antenna-multipath diversity) transfers the antenna diversity to multipath diversity by utilizing the spread-spectrum signal property. If optimal, rather than equal, power allocation is employed with antenna-multipath diversity, the SDMA advantage can be exploited. The optimisation result shows that, for a particular user, transmitting a signal from one antenna, instead of all base-station antennas, gives better SIR performance. The SIR CDF has been examined by simulation to verify this scheme. Compared to sending from all antennas, the result shows, that for 8 users, this scheme yields improved SIR by 3 dB with 5 antennas. The SIR advantage increases with increasing numbers of antennas and decreases, however, with increasing numbers of users in the cell.

Conference

Conference5th IEE International Conference on 3G Mobile Communication Technologies (3G 2004)
CityLondon
Period18/10/0420/10/04

Fingerprint

Code division multiple access
Antennas
Base stations
Space division multiple access
Power transmission
Power control
Topology

Keywords

  • spread spectrum communication
  • equal power allocation
  • downlink diversity
  • multipath channels
  • diversity reception
  • telecommunication control
  • SIR-balanced power control
  • antenna-multipath diversity
  • SDMA
  • uplink capacity
  • spread-spectrum signal
  • multiple base-station antennas
  • signal-to-interference ratio
  • distributed antenna diversity
  • mobile radio
  • power control
  • code division multiple access
  • CDMA

Cite this

Tong, F., Glover, I. A., Pennock, S. R., & Shepherd, P. R. (2004). Optimal transmission scheme for a distributed antenna in CDMA system. 600-603. Paper presented at 5th IEE International Conference on 3G Mobile Communication Technologies (3G 2004), London, .

Optimal transmission scheme for a distributed antenna in CDMA system. / Tong, F; Glover, I A; Pennock, S R; Shepherd, P R.

2004. 600-603 Paper presented at 5th IEE International Conference on 3G Mobile Communication Technologies (3G 2004), London, .

Research output: Contribution to conferencePaper

Tong, F, Glover, IA, Pennock, SR & Shepherd, PR 2004, 'Optimal transmission scheme for a distributed antenna in CDMA system' Paper presented at 5th IEE International Conference on 3G Mobile Communication Technologies (3G 2004), London, 18/10/04 - 20/10/04, pp. 600-603.
Tong F, Glover IA, Pennock SR, Shepherd PR. Optimal transmission scheme for a distributed antenna in CDMA system. 2004. Paper presented at 5th IEE International Conference on 3G Mobile Communication Technologies (3G 2004), London, .
Tong, F ; Glover, I A ; Pennock, S R ; Shepherd, P R. / Optimal transmission scheme for a distributed antenna in CDMA system. Paper presented at 5th IEE International Conference on 3G Mobile Communication Technologies (3G 2004), London, .4 p.
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title = "Optimal transmission scheme for a distributed antenna in CDMA system",
abstract = "Distributed antenna diversity employs separately installed, but cooperating, antennas within a single base-station; it has been proved that the uplink capacity (per cell) in terms of maximum achievable SIR (signal-to-interference ratio) is linear with the number of deployed antenna units. While in the downlink, because of the multiple-to-one propagation topology, equal power (transmission power at each antenna) allocation (providing equal SIR) in the base-station results in fixed SIR at the mobile terminal, irrespective of the number of base-station antennas used. A transmission scheme, using optimal power allocation and SIR-balanced power control, is proposed to increase the SIR by exploiting multiple base-station antennas. The downlink diversity (called antenna-multipath diversity) transfers the antenna diversity to multipath diversity by utilizing the spread-spectrum signal property. If optimal, rather than equal, power allocation is employed with antenna-multipath diversity, the SDMA advantage can be exploited. The optimisation result shows that, for a particular user, transmitting a signal from one antenna, instead of all base-station antennas, gives better SIR performance. The SIR CDF has been examined by simulation to verify this scheme. Compared to sending from all antennas, the result shows, that for 8 users, this scheme yields improved SIR by 3 dB with 5 antennas. The SIR advantage increases with increasing numbers of antennas and decreases, however, with increasing numbers of users in the cell.",
keywords = "spread spectrum communication, equal power allocation, downlink diversity, multipath channels, diversity reception, telecommunication control, SIR-balanced power control, antenna-multipath diversity, SDMA, uplink capacity, spread-spectrum signal, multiple base-station antennas, signal-to-interference ratio, distributed antenna diversity, mobile radio, power control, code division multiple access, CDMA",
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year = "2004",
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pages = "600--603",
note = "5th IEE International Conference on 3G Mobile Communication Technologies (3G 2004) ; Conference date: 18-10-2004 Through 20-10-2004",

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TY - CONF

T1 - Optimal transmission scheme for a distributed antenna in CDMA system

AU - Tong,F

AU - Glover,I A

AU - Pennock,S R

AU - Shepherd,P R

PY - 2004

Y1 - 2004

N2 - Distributed antenna diversity employs separately installed, but cooperating, antennas within a single base-station; it has been proved that the uplink capacity (per cell) in terms of maximum achievable SIR (signal-to-interference ratio) is linear with the number of deployed antenna units. While in the downlink, because of the multiple-to-one propagation topology, equal power (transmission power at each antenna) allocation (providing equal SIR) in the base-station results in fixed SIR at the mobile terminal, irrespective of the number of base-station antennas used. A transmission scheme, using optimal power allocation and SIR-balanced power control, is proposed to increase the SIR by exploiting multiple base-station antennas. The downlink diversity (called antenna-multipath diversity) transfers the antenna diversity to multipath diversity by utilizing the spread-spectrum signal property. If optimal, rather than equal, power allocation is employed with antenna-multipath diversity, the SDMA advantage can be exploited. The optimisation result shows that, for a particular user, transmitting a signal from one antenna, instead of all base-station antennas, gives better SIR performance. The SIR CDF has been examined by simulation to verify this scheme. Compared to sending from all antennas, the result shows, that for 8 users, this scheme yields improved SIR by 3 dB with 5 antennas. The SIR advantage increases with increasing numbers of antennas and decreases, however, with increasing numbers of users in the cell.

AB - Distributed antenna diversity employs separately installed, but cooperating, antennas within a single base-station; it has been proved that the uplink capacity (per cell) in terms of maximum achievable SIR (signal-to-interference ratio) is linear with the number of deployed antenna units. While in the downlink, because of the multiple-to-one propagation topology, equal power (transmission power at each antenna) allocation (providing equal SIR) in the base-station results in fixed SIR at the mobile terminal, irrespective of the number of base-station antennas used. A transmission scheme, using optimal power allocation and SIR-balanced power control, is proposed to increase the SIR by exploiting multiple base-station antennas. The downlink diversity (called antenna-multipath diversity) transfers the antenna diversity to multipath diversity by utilizing the spread-spectrum signal property. If optimal, rather than equal, power allocation is employed with antenna-multipath diversity, the SDMA advantage can be exploited. The optimisation result shows that, for a particular user, transmitting a signal from one antenna, instead of all base-station antennas, gives better SIR performance. The SIR CDF has been examined by simulation to verify this scheme. Compared to sending from all antennas, the result shows, that for 8 users, this scheme yields improved SIR by 3 dB with 5 antennas. The SIR advantage increases with increasing numbers of antennas and decreases, however, with increasing numbers of users in the cell.

KW - spread spectrum communication

KW - equal power allocation

KW - downlink diversity

KW - multipath channels

KW - diversity reception

KW - telecommunication control

KW - SIR-balanced power control

KW - antenna-multipath diversity

KW - SDMA

KW - uplink capacity

KW - spread-spectrum signal

KW - multiple base-station antennas

KW - signal-to-interference ratio

KW - distributed antenna diversity

KW - mobile radio

KW - power control

KW - code division multiple access

KW - CDMA

M3 - Paper

SP - 600

EP - 603

ER -