tailieunhanh - Báo cáo hóa học: " Research Article Low-Complexity Design of Frequency-Hopping Codes for MIMO Radar for Arbitrary Doppler"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: IResearch Article Low-Complexity Design of Frequency-Hopping Codes for MIMO Radar for Arbitrary Doppler | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2010 Article ID319065 14 pages doi 2010 319065 Research Article Low-Complexity Design of Frequency-Hopping Codes for MIMO Radar for Arbitrary Doppler Badrinath S. Anand Srinivas and V. U. Reddy Communication Research Center IIIT-H Hyderabad 500032 India Correspondence should be addressed to V. U. Reddy vur@ Received 8 February 2010 Revised 11 May 2010 Accepted 30 September 2010 Academic Editor M. Greco Copyright 2010 Badrinath S. et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. There has been a recent interest in the application of Multiple-Input Multiple-Output MIMO communication concepts to radars. Recent literature discusses optimization of orthogonal frequency-hopping waveforms for MIMO radars based on a newly formulated MIMO ambiguity function. Existing literature however makes the assumption of small target Doppler. We first extend the scope of this ambiguity function to large values of target Doppler. We introduce the concept of hit-matrix in the MIMO context which is based on the hit-array which has been used extensively in the context of frequency-hopping waveforms for phased-array radars. We then propose new methods to obtain near optimal waveforms in both the large and small Doppler scenarios. Under the large Doppler scenario we propose the use of a cost function based on the hit-matrix which offers a significantly lower computational complexity as compared to an ambiguity based cost function with no loss in code performance. In the small Doppler scenario we present an algorithm for directly designing the waveform from certain properties of the ambiguity function in conjunction with the hit-matrix. Finally we introduce weighted optimization wherein we mask the cost function used in the

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