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
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Tellambura, C
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Hanzo, L
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2002
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.
.
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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bjc-ct-lh-vtcspring-2002.pdf
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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
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Date deposited: 26 Jun 2003
Last modified: 18 Mar 2024 02:33
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Contributors
Author:
B J Choi
Author:
C Tellambura
Author:
L Hanzo
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