Multi-carrier CDMA systems using bridge functions
2000 (English)In: Vehicular Technology Conference Proceedings, 2000. VTC 2000-Spring Tokyo. 2000 IEEE 51st, New York: IEEE , 2000, 1928-1932 p.Conference paper (Refereed)
Multi-carrier CDMA systems appear to be a good candidate for high speed wireless data transmission. These systems avoid time domain equalization and have the capability of achieving high diversity gains over frequency selective fading channels. Orthogonal Walsh-Hadamard spreading waveforms have been commonly considered for these systems. However, reliable system performance over frequency selective fading channels requires complicated detector structures with a complexity that increases with the length of the spreading code. In this paper a multi-carrier CDMA system using the Bridge functions as spreading waveforms is considered and its performance over frequency selective fading channels is evaluated. The bridge functions are three valued orthogonal functions which take the values +1, 0, and -1. Such a structure adds flexibility to the multi-carrier CDMA where the number of zeros in the spreading code can be used to decide on the frequency separation between the modulated subcarriers and thus avoiding the need for frequency interleaving. Another benefit is the possibility to use more powerful detectors at the receiver. In fact, this combined system can be seen as a generalization to multi-carrier CDMA where the bridge functions play the role of bridging between the regular OFDM with no spreading and multi-carrier CDMA with Walsh-Hadamard functions.
Place, publisher, year, edition, pages
New York: IEEE , 2000. 1928-1932 p.
Computer and Information Science
Research subject SRA - ICT
IdentifiersURN: urn:nbn:se:kth:diva-28056DOI: 10.1109/VETECS.2000.851608ISBN: 0-7803-5718-3OAI: oai:DiVA.org:kth-28056DiVA: diva2:383882
51st Vehicular Technology Conference Proceedings, Tokyo, 15 May 2000-18 May 2000
QC 201101112011-01-062011-01-062011-11-29Bibliographically approved