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Crest Factors of Shapiro-Rudin Sequence Based Multi-Code MC-CDMA Signals

Crest Factors of Shapiro-Rudin Sequence Based Multi-Code MC-CDMA Signals
Crest Factors of Shapiro-Rudin Sequence Based Multi-Code MC-CDMA Signals
The envelope power of MC-CDMA signals usually exhibits wide fluctuations, leading to a high value of the associated crest factor. However, when Shapiro-Rudin based sequences, namely a Shapiro-Rudin pair, a Shapiro-Rudin based sub-complementary pair and a Shapiro-Rudin based Sivaswamy’s complementary set are used for two- and four-code BPSK modulated MC-CDMA spreading sequences, the crest factor is found to be bounded by 3dB. These sequences belong to the so-called orthogonal complementary set and Walsh-Hadamard sequences constitute a special case of these sets, when the sequence length is equal to the number of codes. When a typical nonlinear power amplifier is used, the low crest factor of the Shapiro-Rudin sequence based multi-code MC-CDMA scheme results in reduced amplifier-induced signal clipping. Hence a reduced power loss is imposed due to clipping in comparison to OFDM and to multi-code MC-CDMA schemes based on other spreading sequences, such as Walsh codes, orthogonal Gold codes, Frank codes and Zadoff-Chu codes.
1472-1476
Choi, B J
d9b945af-61b8-4a65-84a4-c4fb6033045a
Tellambura, C
d716675f-abd6-462e-b915-7b4b0a45cc12
Hanzo, L
66e7266f-3066-4fc0-8391-e000acce71a1
Choi, B J
d9b945af-61b8-4a65-84a4-c4fb6033045a
Tellambura, C
d716675f-abd6-462e-b915-7b4b0a45cc12
Hanzo, L
66e7266f-3066-4fc0-8391-e000acce71a1

Choi, B J, Tellambura, C and Hanzo, L (2002) Crest Factors of Shapiro-Rudin Sequence Based Multi-Code MC-CDMA Signals. VTC'2002 (Spring), Birmingham, United States. 06 - 09 May 2002. pp. 1472-1476 .

Record type: Conference or Workshop Item (Other)

Abstract

The envelope power of MC-CDMA signals usually exhibits wide fluctuations, leading to a high value of the associated crest factor. However, when Shapiro-Rudin based sequences, namely a Shapiro-Rudin pair, a Shapiro-Rudin based sub-complementary pair and a Shapiro-Rudin based Sivaswamy’s complementary set are used for two- and four-code BPSK modulated MC-CDMA spreading sequences, the crest factor is found to be bounded by 3dB. These sequences belong to the so-called orthogonal complementary set and Walsh-Hadamard sequences constitute a special case of these sets, when the sequence length is equal to the number of codes. When a typical nonlinear power amplifier is used, the low crest factor of the Shapiro-Rudin sequence based multi-code MC-CDMA scheme results in reduced amplifier-induced signal clipping. Hence a reduced power loss is imposed due to clipping in comparison to OFDM and to multi-code MC-CDMA schemes based on other spreading sequences, such as Walsh codes, orthogonal Gold codes, Frank codes and Zadoff-Chu codes.

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More information

Published date: 2002
Additional Information: Event Dates: 6-9 May 2002
Venue - Dates: VTC'2002 (Spring), Birmingham, United States, 2002-05-06 - 2002-05-09
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 257144
URI: http://eprints.soton.ac.uk/id/eprint/257144
PURE UUID: 91cc7eba-5860-4b15-8b05-734071f29650
ORCID for L Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

Catalogue record

Date deposited: 26 Jun 2003
Last modified: 05 Nov 2019 02:07

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