MMSE joint detection for an asynchronous spread-spectrum system based on random permutations

• Main Authors: Coulon, M., Roviras, D.
• Format: Conference Proceeding
• Language: English
• Subjects: Applied sciences; Clocks; Detection, estimation, filtering, equalization, prediction; Detectors; Exact sciences and technology; Gold; Information analysis; Information, signal and communications theory; Interference; Mean square error methods; Multiaccess communication; Optical signal processing; Performance analysis; 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)
• ISSN: 1520-6149; 2379-190X
• DOI: 10.1109/ICASSP.2004.1326449

This paper studies the joint detection of bits for a new spread-spectrum system based on random permutations. The proposed technique can be regarded as a special case of discrete linear periodic time varying filters. As any spread-spectrum technique, this method generates multi-access interference, which must be mitigated in order to retrieve the users' bits with acceptable bit-error-rate. Thus, different detection strategies must be analysed regarding their performance, their complexity and the available a priori information. In this paper, an asynchronous model is considered, and a linear minimum mean-square error (MMSE) detector fitted to this model is investigated. Theoretical and simulated results are provided, along with a comparison with the corresponding detector for CDMA systems.