Microcellular direct-sequence spread-spectrum radio system using N-path RAKE receiver
| Autor: | Hans Kaufmann, E. Zollinger, A.L. Welti, Urs Grob, Roland Küng |
|---|---|
| Rok vydání: | 1990 |
| Předmět: |
Computer Networks and Communications
Computer science Gold code Radio receiver Direct-sequence spread spectrum Time diversity law.invention Diversity combining law Electronic engineering Fading Electrical and Electronic Engineering Wideband Radio receiver design business.industry Code division multiple access ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS Bandwidth (signal processing) Keying Spread spectrum Modulation Rake receiver Telecommunications business Multipath propagation Phase-shift keying |
| Zdroj: | IEEE Journal on Selected Areas in Communications. 8:772-780 |
| ISSN: | 0733-8716 |
| DOI: | 10.1109/49.56384 |
| Popis: | A microcellular local area network (LAN) for indoor communications is proposed using code-division multiple access (CDMA) and differential phase-shift keying (DPSK) for data modulation. The pseudonoise (PN) codes in the transmitters of the base station are mutually synchronized. For this purpose, sets of Gold code sequences having low cross correlation have been found by an exhaustive computer search. Together with wideband measurements of the indoor radio channel at 900 MHz, a five-path RAKE receiver was designed to combat fading effects and to process the time diversity by using multipath signal reception. Each receiver path is demodulated independently. Several methods of diversity combining of these paths have been investigated. Acquisition and tracking of the spreading code in the receiver are controlled by a digital signal processor (DSP). Experimental results of the CDMA system are presented, showing the behavior in a multipath environment. > |
| Databáze: | OpenAIRE |
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