Design of orthogonal LPTV filters: application to spread spectrum multiple access

• Published in: 2004 IEEE International Conference on Acoustics, Speech, and Signal Processing Vol. 2; pp. ii - 645
• Main Authors: Chauvet, W., Cristea, B., Lacaze, B., Roviras, D., Duverdier, A.
• Format: Conference Proceeding
• Language: English
• Published: Piscataway, N.J IEEE 2004
• Subjects: Applied sciences; Detection, estimation, filtering, equalization, prediction; Exact sciences and technology; Filters; Information, signal and communications theory; Signal and communications theory; Signal, noise; Spread spectrum communication; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Transmission and modulation (techniques and equipments); Performance evaluation; Multiple access; Time varying system; Time-varying filters; Linear system; Simulation; Linear filter; Code division multiple access; Theoretical study; Spread spectrum; Direct sequence; Periodic variation
• ISBN: 9780780384842; 0780384849
• ISSN: 1520-6149; 2379-190X
• DOI: 10.1109/ICASSP.2004.1326340

This paper is focused on the design of a set of orthogonal linear periodic time varying (LPTV) filters and proposes to apply this result to spread spectrum multiuser transmissions. The construction method of such an orthogonal set is presented, emphasizing that only an invertible LPTV filter is required, since the full set is then deduced from this kernel element. Based on this theoretical result, a spread spectrum multiuser transmission is proposed. In order to appreciate the performance of the proposed system, simulations are performed and results are compared to a classical DS-CDMA system.