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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Byoung-Jo Choi Tellambura, C. Hanzo, L. |
| Copyright Year | 2002 |
| Description | Author affiliation: Dept. of Electron. & Comput. Sci., Southampton Univ., UK (Byoung-Jo Choi; Tellambura, C.; Hanzo, L.) |
| 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 (1959) pair, a Shapiro-Rudin based sub-complementary pair and a Shapiro-Rudin based Sivaswamy's (1978) 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 multicode MC-CDMA schemes based on other spreading sequences, such as Walsh codes, orthogonal Gold codes, Frank (1962) codes and Zadoff-Chu (1972) codes. |
| Starting Page | 1472 |
| Ending Page | 1476 |
| File Size | 555236 |
| Page Count | 5 |
| File Format | |
| ISBN | 0780374843 |
| DOI | 10.1109/VTC.2002.1002861 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2002-05-06 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Multicarrier code division multiple access OFDM Multiaccess communication Frequency diversity Fading Binary phase shift keying Multipath channels Power system modeling Fluctuations Gold |
| Content Type | Text |
| Resource Type | Article |
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