NDLI: An improved signature waveform approach exploiting pulse shaping information in synchronous CDMA systems

Content Provider	IEEE Xplore Digital Library
Author	Torlak, M. Guanghan Xu Hui Liu
Copyright Year	1996
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Texas Univ., Austin, TX, USA (Torlak, M.; Guanghan Xu)
Abstract	Synchronous-CDMA (S-CDMA) techniques are protected against co-channel interference by employing orthogonal codes. In an actual mobile radio environment, however, multipath may cause the orthogonality of S-CDMA signals to suffer from the increased cross correlation. In this scenario, multiuser detection is imperative to recover the orthogonality of the code. Liu and Xu [1996] have proposed a blind-estimation scheme that provides closed-form estimates of the signature waveforms by exploiting the structure information of the data output. The approach is deterministic in the sense that noise or signal statistics are not required for the estimation. However, the estimation utilizes only users' code information. In this paper, we present a modified method that uses the known information of the pulse shaping filter as well as code information to improve the signature waveform estimates. We then extend this approach to overloaded systems by employing smart antennas.
Starting Page	823
Ending Page	827
File Size	368953
Page Count	5
File Format	PDF
ISBN	0780332504
DOI	10.1109/ICC.1996.541295
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-06-23
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Pulse shaping methods Code division multiplexing Multiuser detection Interference Statistics Information filtering Information filters Communication system traffic Noise shaping Protection
Content Type	Text
Resource Type	Article

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