Browsing by Author "Tsai, LS"

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Transform domain approach for sequence design and its applications
(2006-01-01)
Tsai, LS
;
Su, YT
;
電信工程研究所
;
Institute of Communications Engineering
Many communication and radar systems necessitate the use of sequences with desired autocorrelation (AC) and cross-correlation (CC) properties. This paper presents a systematic method based on the transform domain characterization of the AC and CC constraints to generate new families of sequences that meet the requirements. We demonstrate that some existing families can easily be generated by our approach. Our approach, however, renders new families of sequences with less constraints. The proposed approach is elementary and can easily be extended to synthesize two-dimensional arrays or even higher dimensional waveforms that possess the desired multidimensional correlation properties. A preamble structure based on our new sequence family is suggested and performance of frequency offset and channel estimation algorithms for a multiantenna orthogonal frequency-division multiplexing (OFDM) system that uses such a preamble is given.
Transform domain synthesis of communication sequences
(2005)
Tsai, LS
;
Su, YT
;
電信工程研究所
;
Institute of Communications Engineering
Many communication and radar systems necessitate the use of sequences with desired autocorrelation (AC) and cross-correlation (CC) properties. This paper presents a systematic method based on the frequency (transform) domain characterization of the the AC and CC constraints to generate new families of sequences that meet the requirements. We demonstrate that some existing families can easily he generated by our approach. But our approach is more general for it renders new families of sequences with less constraint on the sequence's AC period. The proposed approach is elementary and can easily be extended to synthesize two-dimensional arrays that possess the desired two-dimensional correlation properties.