Title :
Solving user-symbol specific phase offset problem for multiuser MIMO-OFDM fixed uplink
Author :
Suzuki, Hajime ; Pathikulangara, Joseph ; Humphrey, David
Author_Institution :
ICT Centre, CSIRO, Epping, NSW, Australia
Abstract :
Previous works on carrier frequency offset (CFO) estimation for a multi-user multiple-input multiple-output orthogonal frequency division multiplexing (MU-MIMO-OFDM) uplink typically assume CFO being constant over multiple OFDM symbol periods. The assumption may not hold when an inexpensive global positioning system (GPS) receiver is used to generate a frequency reference. We propose a new channel estimation method designed for fixed MU-MIMO-OFDM uplink utilizing GPS receivers. The effectiveness of the proposed method is verified by 1) bit error probability simulation and 2) actual MU-MIMO-OFDM uplink packet transmission test in a lab involving 6 independent users in a UHF band.
Keywords :
Global Positioning System; MIMO communication; OFDM modulation; channel estimation; error statistics; frequency estimation; multiuser channels; radio receivers; CFO estimation; MU-MIMO-OFDM uplink packet transmission test; UHF band; bit error probability simulation; carrier frequency offset; channel estimation method; frequency reference; global positioning system receiver; multiple OFDM symbol periods; multiuser MIMO-OFDM fixed uplink; multiuser multiple-input multiple-output orthogonal frequency division multiplexing uplink; user-symbol specific phase offset problem; Channel estimation; Estimation; Global Positioning System; Multiaccess communication; OFDM; Receivers; Signal to noise ratio; MIMO; Multiuser channels; OFDM;
Conference_Titel :
Microwave Conference Proceedings (APMC), 2011 Asia-Pacific
Conference_Location :
Melbourne, VIC
Print_ISBN :
978-1-4577-2034-5
