Generalized Chu polyphase sequences

Pereira, J. S.; Silva, H. J. A. da

http://hdl.handle.net/10400.8/13152

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Generalized chu polyphase sequences.pdf	The perfect sequences are so ideal that all out-ofphase autocorrelation coefficients are zero. A method to generate a prime number N of perfect sequences with length N is presented. Moreover, these new sets have one more perfect sequence than Chu polyphase sets with the same maximum absolute value of periodic cross-correlation, and are slightly better for asynchronous direct sequence code division multiple access (DS-CDMA). The new sequences are more robust than Chu sequences when used with M-ary quadrature amplitude modulation (QAM). The reason for this improvement is that the new sequences are designed to be orthogonal to the M-ary QAM carriers. Other sequence transformations are also suggested and may be used to obtain many other perfect sequences with the same correlation properties. For example, the new sequences can be transformed into quadriphase sequences, also with good correlation properties.	1.41 MB	Adobe PDF	Download

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Authors

Pereira, J. S.

Silva, H. J. A. da

Abstract(s)

The perfect sequences are so ideal that all out-ofphase autocorrelation coefficients are zero. A method to generate a prime number N of perfect sequences with length N is presented. Moreover, these new sets have one more perfect sequence than Chu polyphase sets with the same maximum absolute value of periodic cross-correlation, and are slightly better for asynchronous direct sequence code division multiple access (DS-CDMA). The new sequences are more robust than Chu sequences when used with M-ary quadrature amplitude modulation (QAM). The reason for this improvement is that the new sequences are designed to be orthogonal to the M-ary QAM carriers. Other sequence transformations are also suggested and may be used to obtain many other perfect sequences with the same correlation properties. For example, the new sequences can be transformed into quadriphase sequences, also with good correlation properties.

Description

Article number 5158617 - 16th International Conference on Telecommunications, ICT 2009, 25 May 2009 through 27 May 2009 - Code 79805

Keywords

CDMA Perfect Sequences Polyphase Sequences Chu Sequences

URI

http://hdl.handle.net/10400.8/13152

Citation

J. S. Pereira and H. J. A. da Silva, "Generalized Chu polyphase sequences," 2009 International Conference on Telecommunications, Marrakech, Morroco, 2009, pp. 47-52, doi: https://doi.org/10.1109/ICTEL.2009.5158617.