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Extending Distributed-Based Transversal Filter Method to Spectral Amplitude Encoded CDMA

Aguilar-Torrentera, J; Garcia-Sanchez, G; Rodriguez-Cruz, R; Darwazeh, IZ; (2018) Extending Distributed-Based Transversal Filter Method to Spectral Amplitude Encoded CDMA. IEICE Transactions on Electronics , E101C (12) pp. 953-962. 10.1587/transele.E101.C.953. Green open access

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Abstract

In this paper, the analog code modulation characteristics of distributed-based transversal filters (DTFs) suitable for use in spectrally encoded CDMA systems are presented. The DTF is verified as an appropriate method to use in high-speed CDMA systems as opposed to previously proposed methods, which are intended for Direct Sequence (DS) CDMA systems. The large degree of freedom of DTF design permits controlling the filter pulse response to generate well specified temporal phase-coded signals. A decoder structure that performs bipolar detection of user subbands giving rise to a Spectral-Amplitude Encoded CDMA system is considered. Practical implementations require truncating the spreading signals by a time window of duration equal to the span time of the tapped delay line. Filter functions are chosen to demodulate the matched channel and achieve improved user interference rejection avoiding the need for transversal filters featuring a large number of taps. As a proof-of-concept of the electronic SAE scheme, practical circuit designs are developed at low speeds (3-dB point at 1 GHz) demonstrating the viability of the proposal.

Type: Article
Title: Extending Distributed-Based Transversal Filter Method to Spectral Amplitude Encoded CDMA
Open access status: An open access version is available from UCL Discovery
DOI: 10.1587/transele.E101.C.953
Publisher version: https://doi.org/10.1587/transele.E101.C.953
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: code division multiplexing, distributed amplifiers, high-speed electronics, modulation coding, optical receivers
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10078233
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