Beamforming utilizing channel norm feedback in multiuser MIMO systems

• The problem of beamforming and rate estimation in a multi-user downlink multiple-input multiple-output (MIMO) system with limited feedback and statistical channel information at the transmitter is considered. In order to exploit the spatial properties of the channel, the norm of the channel to each receive antenna is computed. We propose to feed back the largest norm to the transmitter and derive the conditional second and fourth order channel moments in order to design the downlink beamforming weights. Similar approaches have previously been presented for multi-user multiple-input single-output (MISO) systems. Herein, these techniques are generalized to MIMO systems, by either antenna selection or receive beamforming at the receiver. Two eigenbeamforming strategies are proposed and shown to outperform opportunistic beamforming, based on similar feedback information.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik -- Signalbehandling (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering -- Signal Processing (hsv//eng)

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik -- Telekommunikation (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering -- Telecommunications (hsv//eng)

Nyckelord

Antenna accessories

Antennas

Beamforming

Channel estimation

Computer systems

Decoding

MIM devices

MIMO systems

Mobile telecommunication systems

Multipath propagation

Parameter estimation

Receiving antennas

Signal processing

Telecommunication

Telecommunication systems

Transmitters

Antenna selection

Channel information

Downlink beam-forming

Eigen-beamforming

Feed back

Feed back information

Fourth order

Limited feedback

Multi users

Multi-user MIMO systems

Multi-user multiple-input single-output

Multiple-input multiple-output systems

Opportunistic Beamforming

Rate estimation

Receive antennas

Receive beamforming

Spatial properties

Wireless communications

Multiplexing

Signal processing

Signalbehandling

Publikations- och innehållstyp

ref (ämneskategori)

kon (ämneskategori)