Reducing the crest factor of a CDMA downlink signal by adding unused channelization codes

In a CDMA system the downlink signal typically has a high peak-to-average ratio (crest factor). This sets strict requirements for the linearity of the power amplifier, which leads to poor efficiency and high costs. This letter discusses a method for reducing the crest factor based on the addition of...

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Veröffentlicht in:	IEEE communications letters 2002-10, Vol.6 (10), p.443-445
Hauptverfasser:	Vaananen, O., Vankka, J., Viero, T., Halonen, K.
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Baseband Channels Code division multiple access Costs Downlink Energy consumption Errors Exact sciences and technology High power amplifiers Linearity Multiaccess communication OFDM Peak to average power ratio Power amplifiers Receivers Signal generators Systems, networks and services of telecommunications Telecommunications Telecommunications and information theory Transmission and modulation (techniques and equipments)
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Beschreibung
Zusammenfassung:	In a CDMA system the downlink signal typically has a high peak-to-average ratio (crest factor). This sets strict requirements for the linearity of the power amplifier, which leads to poor efficiency and high costs. This letter discusses a method for reducing the crest factor based on the addition of a signal which is orthogonal to all the active channel codes. Therefore, in an ideal case, no error is introduced at the receiver.
ISSN:	1089-7798 1558-2558
DOI:	10.1109/LCOMM.2002.804245