Title :
Parallel transmission scheme using cyclic modified M-sequence CDM for broadband mobile communications
Author :
Harada, Hiroshi ; Wu, Gang ; Taira, Kazumasa ; Hase, Yoshihiro ; Sasaoka, Hideichi
Author_Institution :
Commun. Res. Lab., Minist. of Posts & Telecommun., Japan
Abstract :
This paper proposes a new parallel transmission scheme using cyclic codes generated from a modified M-sequence, which is biased with constant direct current (dc) on a M-sequence and inserted guard chips before and after this biased M-sequence. In the proposed system, the orthogonality of codes is kept not only between parallel transmission channels but also between direct and delayed waves within the guard chips. In this paper we apply a code and chip timing joint recovery scheme based on the feature of the guard chips of a modified M-sequence and evaluate the bit error rate performances by computer simulations. As a result, the proposed system can transmit several Mbps with better quality in comparison with conventional multi-code code division multiplexing (CDM) transmission
Keywords :
Rayleigh channels; binary sequences; broadband networks; cyclic codes; data communication; error statistics; land mobile radio; synchronisation; CDM; Rayleigh fading; bit error rate performance; broadband mobile communications; chip timing joint recovery scheme; code division multiplexing; computer simulations; constant direct current; cyclic codes; guard chips; modified M-sequenc; orthogonality; parallel transmission scheme; Bit error rate; Bit rate; Broadband communication; DC generators; Delay effects; Mobile communication; Multimedia communication; Performance evaluation; Propagation delay; Timing;
Conference_Titel :
Communications, 1997. ICC '97 Montreal, Towards the Knowledge Millennium. 1997 IEEE International Conference on
Conference_Location :
Montreal, Que.
Print_ISBN :
0-7803-3925-8
DOI :
10.1109/ICC.1997.610015
