Modified Walsh-Hadamard sequences for DS CDMA wireless systems

B. J. Wysocki; T. A. Wysocki

doi:10.1002/acs.727

Modified Walsh-Hadamard sequences for DS CDMA wireless systems

B. J. Wysocki, T. A. Wysocki

Research output: Contribution to journal › Article › peer-review

48 Scopus citations

Abstract

We propose a simple but efficient method for modifying Walsh-Hadamard sequences to achieve correlation properties suited for asynchronous DS CDMA applications. The proposed method can be used to minimize the mean square value of aperiodic cross-correlation or the mean square value of aperiodic autocorrelation, the maximum value of aperiodic cross-correlation functions, merit factor or other properties of the sequence set. The important feature of the method is that it modifies correlation properties of the sequence set, while preserving their orthogonality for the perfect synchronization. The proposed method can be applied to obtain bipolar, quadri-phase, or general polyphase sequences.

Original language	English (US)
Pages (from-to)	589-602
Number of pages	14
Journal	International Journal of Adaptive Control and Signal Processing
Volume	16
Issue number	8 SPEC.
DOIs	https://doi.org/10.1002/acs.727
State	Published - Oct 2002
Externally published	Yes

Keywords

Code division multiple access
Correlation functions
Orthogonal sequences
Spreading sequences

ASJC Scopus subject areas

Control and Systems Engineering
Signal Processing
Electrical and Electronic Engineering

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10.1002/acs.727

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AU - Wysocki, T. A.

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N2 - We propose a simple but efficient method for modifying Walsh-Hadamard sequences to achieve correlation properties suited for asynchronous DS CDMA applications. The proposed method can be used to minimize the mean square value of aperiodic cross-correlation or the mean square value of aperiodic autocorrelation, the maximum value of aperiodic cross-correlation functions, merit factor or other properties of the sequence set. The important feature of the method is that it modifies correlation properties of the sequence set, while preserving their orthogonality for the perfect synchronization. The proposed method can be applied to obtain bipolar, quadri-phase, or general polyphase sequences.

AB - We propose a simple but efficient method for modifying Walsh-Hadamard sequences to achieve correlation properties suited for asynchronous DS CDMA applications. The proposed method can be used to minimize the mean square value of aperiodic cross-correlation or the mean square value of aperiodic autocorrelation, the maximum value of aperiodic cross-correlation functions, merit factor or other properties of the sequence set. The important feature of the method is that it modifies correlation properties of the sequence set, while preserving their orthogonality for the perfect synchronization. The proposed method can be applied to obtain bipolar, quadri-phase, or general polyphase sequences.

KW - Code division multiple access

KW - Correlation functions

KW - Orthogonal sequences

KW - Spreading sequences

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Modified Walsh-Hadamard sequences for DS CDMA wireless systems

Abstract

Keywords

ASJC Scopus subject areas

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