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Title: Analytical computation of the correlation of spreading sequences for nonlinear OQPSK-type modulations
Authors: Dinis, Rui
Afonso, Daniel
Cercas, Francisco
Rodrigues, Rui
Luz, Ângelo
Keywords: PN sequences
Nonlinear modulations
Correlation behavior
Issue Date: 2012
Publisher: ETT
Abstract: In this paper we study the behavior and correlation properties of some spreading sequences when applied to a system using nonlinear offset quadrature phase-shift keying-type modulations. These signals, which include as special cases continuousphase modulation schemes, can be designed to have very low envelope fluctuations or even a constant envelope, making them compatible with a very low-cost and power-efficient grossly nonlinear amplification. We use an analytical method to derive the correlation of those signals. The resulting expressions are then applied to maximum-length sequences, Kasami, and Tomlinson, Cercas, Hughes sequences. It is shown that Tomlinson, Cercas, Hughes sequences have better correlation properties than other spreading sequences.
Peer reviewed: yes
metadata.dc.identifier.doi: 10.1002/ett.2524
ISSN: 1124-318X
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Appears in Collections:DCT - Artigos/Papers

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