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Robust Transmit Multiuser Beamforming Using Worst Case Performance Optimization

Sharma, Vimal; Lambotharan, Sangarapillai and Jakobsson, Andreas LU (2008) IEEE Vehicular Technology Conference (VTC Spring 2008) In VTC Spring 2008 - IEEE Vehicular Technology Conference p.1132-1136
Abstract
We address the problem of transmit beamforming under channel uncertainties for a multiuser MIMO system, where both the transmitter and the receiver are equipped with multiple antennas. In transmit beamforming multi-user multiplexing is performed using spatial diversity techniques so that a base station could serve multiple users in the same frequency band enabling a substantial saving in bandwidth utilization. However, such techniques require nearly perfect knowledge of the channel state information at the transmitter, which is generally not available in practise. In this paper, we propose robust spatial multiplexing schemes based on a worst case performance optimization by incorporating imperfect channel state information. In the... (More)
We address the problem of transmit beamforming under channel uncertainties for a multiuser MIMO system, where both the transmitter and the receiver are equipped with multiple antennas. In transmit beamforming multi-user multiplexing is performed using spatial diversity techniques so that a base station could serve multiple users in the same frequency band enabling a substantial saving in bandwidth utilization. However, such techniques require nearly perfect knowledge of the channel state information at the transmitter, which is generally not available in practise. In this paper, we propose robust spatial multiplexing schemes based on a worst case performance optimization by incorporating imperfect channel state information. In the simulation, we have examined two scenarios. In the first the channel state information is assumed to have Gaussian distribution errors. In the second scenario, we analyze the performance for errors introduced due to a partial channel state information feedback scheme. In both scenarios, the proposed robust scheme outperforms the conventional scheme. (Less)
Please use this url to cite or link to this publication:
author
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
partial CSI feedback scheme, transmit multiuser beamforming problem, channel uncertainties, multiuser MIMO system, worst case performance optimization, multiple antennas, spatial multiplexing schemes, spatial diversity techniques, bandwidth utilization, channel state information, Gaussian distribution errors
in
VTC Spring 2008 - IEEE Vehicular Technology Conference
pages
1132 - 1136
conference name
IEEE Vehicular Technology Conference (VTC Spring 2008)
external identifiers
  • Scopus:47749096793
ISSN
1550-2252
language
English
LU publication?
no
id
49fbf92b-c462-4958-bd8a-2753d40ab3a3 (old id 1274722)
alternative location
http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4525796
date added to LUP
2009-05-25 12:12:13
date last changed
2016-10-13 04:33:34
@misc{49fbf92b-c462-4958-bd8a-2753d40ab3a3,
  abstract     = {We address the problem of transmit beamforming under channel uncertainties for a multiuser MIMO system, where both the transmitter and the receiver are equipped with multiple antennas. In transmit beamforming multi-user multiplexing is performed using spatial diversity techniques so that a base station could serve multiple users in the same frequency band enabling a substantial saving in bandwidth utilization. However, such techniques require nearly perfect knowledge of the channel state information at the transmitter, which is generally not available in practise. In this paper, we propose robust spatial multiplexing schemes based on a worst case performance optimization by incorporating imperfect channel state information. In the simulation, we have examined two scenarios. In the first the channel state information is assumed to have Gaussian distribution errors. In the second scenario, we analyze the performance for errors introduced due to a partial channel state information feedback scheme. In both scenarios, the proposed robust scheme outperforms the conventional scheme.},
  author       = {Sharma, Vimal and Lambotharan, Sangarapillai and Jakobsson, Andreas},
  issn         = {1550-2252},
  keyword      = {partial CSI feedback scheme,transmit multiuser beamforming problem,channel uncertainties,multiuser MIMO system,worst case performance optimization,multiple antennas,spatial multiplexing schemes,spatial diversity techniques,bandwidth utilization,channel state information,Gaussian distribution errors},
  language     = {eng},
  pages        = {1132--1136},
  series       = {VTC Spring 2008 - IEEE Vehicular Technology Conference},
  title        = {Robust Transmit Multiuser Beamforming Using Worst Case Performance Optimization},
  year         = {2008},
}