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

Jorge AGUILAR-TORRENTERA, Gerardo GARCÍA-SÁNCHEZ, Ramón RODRÍGUEZ-CRUZ, Izzat Z. DARWAZEH

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Summary :

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.

Publication
IEICE TRANSACTIONS on Electronics Vol.E101-C No.12 pp.953-962
Publication Date
2018/12/01
Publicized
Online ISSN
1745-1353
DOI
10.1587/transele.E101.C.953
Type of Manuscript
PAPER
Category
Electronic Circuits

Authors

Jorge AGUILAR-TORRENTERA
  Universidad Autónoma de Nuevo León
Gerardo GARCÍA-SÁNCHEZ
  Universidad Autónoma de Nuevo León
Ramón RODRÍGUEZ-CRUZ
  Universidad Autónoma de Nuevo León
Izzat Z. DARWAZEH
  University College London

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