TY - GEN
T1 - Blind estimation of multiple carrier frequency offsets
AU - Yu, Anning
AU - Petropulu, Athina P.
AU - Vincent Poor, H.
AU - Koivunen, Visa
PY - 2007
Y1 - 2007
N2 - Multiple carrier-frequency offsets (CFO) arise in a distributed antenna system, where data are transmitted simultaneously from multiple antennas. In such systems the received signal contains multiple CFOs due to mismatch between the local oscillators of transmitters and receiver. This results in a time-varying rotation of the data constellation, which needs to be compensated for at the receiver before symbol recovery. This paper proposes a new approach for blind CFO estimation and symbol recovery. The received base-band signal is over-sampled, and its polyphase components are used to formulate a virtual Multiple-Input Multiple-Output (MIMO) problem. By applying blind MIMO system estimation techniques, the system response is estimated and used to subsequently transform the multiple CFOs estimation problem into many independent single CFO estimation problems. Furthermore, an initial estimate of the CFO is obtained from the phase of the MIMO system response. The Cramer-Rao Lower bound is also derived, and the large sample performance of the proposed estimator is compared to the bound.
AB - Multiple carrier-frequency offsets (CFO) arise in a distributed antenna system, where data are transmitted simultaneously from multiple antennas. In such systems the received signal contains multiple CFOs due to mismatch between the local oscillators of transmitters and receiver. This results in a time-varying rotation of the data constellation, which needs to be compensated for at the receiver before symbol recovery. This paper proposes a new approach for blind CFO estimation and symbol recovery. The received base-band signal is over-sampled, and its polyphase components are used to formulate a virtual Multiple-Input Multiple-Output (MIMO) problem. By applying blind MIMO system estimation techniques, the system response is estimated and used to subsequently transform the multiple CFOs estimation problem into many independent single CFO estimation problems. Furthermore, an initial estimate of the CFO is obtained from the phase of the MIMO system response. The Cramer-Rao Lower bound is also derived, and the large sample performance of the proposed estimator is compared to the bound.
KW - Blind MIMO system identification
KW - Carrier frequency offset
KW - Distributed antenna systems
KW - Multi-user systems
UR - http://www.scopus.com/inward/record.url?scp=44349158424&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=44349158424&partnerID=8YFLogxK
U2 - 10.1109/PIMRC.2007.4394103
DO - 10.1109/PIMRC.2007.4394103
M3 - Conference contribution
AN - SCOPUS:44349158424
SN - 1424411440
SN - 9781424411443
T3 - IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC
BT - 18th Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC'07
T2 - 18th Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC'07
Y2 - 3 September 2007 through 7 September 2007
ER -