TY - JOUR
T1 - Evaluation of transmit diversity in MIMO-radar direction finding
AU - Lehmann, Nikolaus H.
AU - Fishler, Eran
AU - Haimovich, Alexander M.
AU - Blum, Rick S.
AU - Chizhik, Dmitry
AU - Cimini, Leonardo J.
AU - Valenzuela, Reinaldo A.
N1 - Funding Information:
Manuscript received November 10, 2005; revised June 29, 2006. The associate editor coordinating the review of this manuscript and approving it for publication was Dr. Daniel Fuhrmann. The work of A.M. Haimovich was supported by the Air Force Office of Scientific Research under Agreement No. FA9550-06-1-0026. The work of R. S. Blum is based on research supported by the Air Force Research Laboratory under Agreement No. FA9550-06-1-0041.
PY - 2007/5
Y1 - 2007/5
N2 - It has been recently shown that multiple-input multiple-output (MIMO) antenna systems have the potential to dramatically improve the performance of communication systems over single antenna systems. Unlike beamforming, which presumes a high correlation between signals either transmitted or received by an array, the MIMO concept exploits the independence between signals at the array elements. In conventional radar, the target's radar cross section (RCS) fluctuations are regarded as a nuisance parameter that degrades radar performance. The novelty of MIMO radar is that it provides measures to overcome those degradations or even utilizes the RCS fluctuations for new applications. This paper explores how transmit diversity can improve the direction finding performance of a radar utilizing an antenna array at the receiver. To harness diversity, the transmit antennas have to be widely separated, while for direction finding, the receive antennas have to be closely spaced. The analysis is carried out by evaluating several Cramer-Rao bounds for bearing estimation and the mean square error of the maximum likelihood estimate.
AB - It has been recently shown that multiple-input multiple-output (MIMO) antenna systems have the potential to dramatically improve the performance of communication systems over single antenna systems. Unlike beamforming, which presumes a high correlation between signals either transmitted or received by an array, the MIMO concept exploits the independence between signals at the array elements. In conventional radar, the target's radar cross section (RCS) fluctuations are regarded as a nuisance parameter that degrades radar performance. The novelty of MIMO radar is that it provides measures to overcome those degradations or even utilizes the RCS fluctuations for new applications. This paper explores how transmit diversity can improve the direction finding performance of a radar utilizing an antenna array at the receiver. To harness diversity, the transmit antennas have to be widely separated, while for direction finding, the receive antennas have to be closely spaced. The analysis is carried out by evaluating several Cramer-Rao bounds for bearing estimation and the mean square error of the maximum likelihood estimate.
KW - Array processing
KW - Cramer-Rao bound (CRB)
KW - Direction finding
KW - Multiple-input multiple-output (MIMO)-radar
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U2 - 10.1109/TSP.2007.893220
DO - 10.1109/TSP.2007.893220
M3 - Article
AN - SCOPUS:34247849199
SN - 1053-587X
VL - 55
SP - 2215
EP - 2225
JO - IEEE Transactions on Signal Processing
JF - IEEE Transactions on Signal Processing
IS - 5 II
ER -