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Hybrid slow frequency hopping/ direct sequence spread spectrum indoor communication systems with QPSK modulation

Système de radiocommunication à l’intérieur de bâtiments utilisant un étalement de spectre hybride qui combine séquence directe et saut de fréquence lent et une modulation MDP4

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Abstract

This paper analyses the performance of a spread-spectrum multiple access system based on hybrid direct sequence/slow frequency hopping techniques with QPSK modulation. The performance is analyzed considering multipath and multiple access interferences and an indoor channel having Rician distributed path gains. The system performance is investigated for 2 diversity techniques and compared, for given delay spread, bandwidth and bit rate, with the performance provided by bpsk modulation. It is shown that the larger symbol duration of QPSK is favorable to combat the effect of multipath propagation.

Résumé

Cet article étudie les performances d’un système à accès multiple à étalement de spectre, de type hybride séquence directe - saut de fréquence lent, et utilisant une modulation mdp4. Les performances sont étudiées en considérant les effets de trajets multiples, le brouillage dû à d’autres utilisateurs et un canal dont les gains des différents chemins suivent une distribution de Rice. Deux techniques de diversitésont considé rées: la diversité de sélection et la diversité par recombinaison. Les performances du système obtenues avec une modulation mdp4 sont comparées à celles obtenues avec une modulation mdp2 pour un débit binaire donné, une bande passante de système fixée et une dispersion temporelle du canal donnée. Les résultats montrent que la durée de symbole qui est plus grande avec la mdp4 est favorable pour combattre les effets de trajets multiples.

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Authors and Affiliations

  1. Belgian NSF with the Telecommunications and Remote Sensing Laboratory of the Catholic University of Louvain, Stevin Building, 2, place du Levant, B-1348, Louvain-la-Neuve, Belgique

    Luc Vandendorpe

  2. Telecommunications and Traffic-Control Systems group of the Delft Technical university of Technology, P.O. Box 5031, 2600, GA Delft, The Netherlands

    Ramjee Prasad

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  1. Luc Vandendorpe
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  2. Ramjee Prasad
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Vandendorpe, L., Prasad, R. Hybrid slow frequency hopping/ direct sequence spread spectrum indoor communication systems with QPSK modulation. Ann. Télécommun. 49, 518–526 (1994). https://doi.org/10.1007/BF02999443

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  • DOI: https://doi.org/10.1007/BF02999443

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