Title :
In-chip fast frequency hopped and direct sequence CDMA systems for indoor wireless communications
Author :
Mizoguchi, Masato ; Seki, Kazuhiko
Author_Institution :
NTT Wireless Syst. Lab., Kanagawa, Japan
Abstract :
A novel hybrid fast frequency hopping (FFH) and direct sequence (DS) code division multiple access (CDMA) scheme for indoor wireless communications is proposed and analyzed. Bit error rate performance of this hybrid system is compared with that of a wide-band DS-CDMA system and a DS-CDMA system with frequency diversity transmission occupying the same bandwidth. The proposed scheme does not require fast frequency hopping synthesizers covering the radio frequency band, however, it does employ digital FFH modulation and maximum ratio combining diversity. Numerical results using practical system parameters show that the proposed scheme reduces the irreducible error floor by 75% compared to the wideband DS CDMA, and 25% compared to the DS-CDMA with frequency diversity transmission
Keywords :
cellular radio; code division multiple access; diversity reception; error statistics; frequency hop communication; indoor radio; land mobile radio; modulation; pseudonoise codes; spread spectrum communication; bit error rate performance; code division multiple access; digital FFH modulation; hybrid fast frequency hopping direct sequence CDMA; indoor wireless communications; irreducible error floor; maximum ratio combining diversity; Bandwidth; Bit error rate; Diversity reception; Frequency conversion; Frequency diversity; Frequency synthesizers; Multiaccess communication; Spread spectrum communication; Wideband; Wireless communication;
Conference_Titel :
Communications, 1996. ICC '96, Conference Record, Converging Technologies for Tomorrow's Applications. 1996 IEEE International Conference on
Conference_Location :
Dallas, TX
Print_ISBN :
0-7803-3250-4
DOI :
10.1109/ICC.1996.533661
