NDLI: Minimum interference prolate based spreading codes design DS-CDMA overlaying narrow band systems

Content Provider	IEEE Xplore Digital Library
Author	Zazo, S. Raos, I.
Copyright Year	2005
Description	Author affiliation: ETSI de Telecomunicacion, Univ. Politecnica de Madrid, Spain (Zazo, S.; Raos, I.)
Abstract	The overlaying of a CDMA system on an existing narrowband system has been proposed and investigated in several publications. This topic is critical in many environments where new broadband systems are required to coexist with legacy narrowband systems. This paper is focused on minimisation of the performance degradation of the narrow-band system(s) caused by the CDMA one. Common background in most of this topic deals with notch-filtering of CDMA signals in transmitter to minimise its interference over the narrowband signal. However, this solution results in effective spreading codes longer that bit time, causing ISI within the CDMA system. The solution that is proposed in this contribution is the design of spreading codes that notch the CDMA power spectrum density (PSD) on specified bandwidth intervals where narrow-band signals are transmitted. To achieve this, spreading codes are selected from the orthogonal set of polynomials arising from digital prolate functions (DPF) which have property of energy concentration in specified intervals. Provided solution guarantees null interference in CDMA system with orthogonal codes, strictly located within the bit period.
Starting Page	201
Ending Page	205
File Size	892870
Page Count	5
File Format	PDF
ISBN	0780388674
DOI	10.1109/SPAWC.2005.1505900
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-05
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Multiaccess communication Narrowband IIR filters Degradation Transmitters Bandwidth Europe Intersymbol interference Telecommunications Signal design
Content Type	Text
Resource Type	Article

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