Title :
Performance analysis of a multi-code CDM transmission scheme based on cyclic extended spread code as a extension of 3rd generation CDMA system
Author :
Oda, Naoyuki ; Harada, Hiroshi ; Sasase, Iwao ; Hase, Yoshihiro
Author_Institution :
Fac. of Sci. & Technol., Keio Univ., Yokohama, Japan
Abstract :
This paper proposes an adaptive multi-code CDM transmission scheme for the multipath fading environment to achieve high code utilization efficiency. In the proposed system, we apply a new parallel transmission scheme using cyclic codes generated from a modified M-sequence which inserts the guard chips before and after an M-sequence. Moreover with radio channel estimation results obtained from the downlink by this multi-code CDM transmission scheme, the number of guard chips is varied adaptively on the uplink. In a micro cellular system, the performances of the proposed system are evaluated by computer simulation. As a result, it is essential for high quality broadband mobile communications to apply adaptive transmission to the new multi-code CDM transmission system
Keywords :
adaptive codes; broadband networks; cellular radio; code division multiple access; cyclic codes; fading; multipath channels; multiplexing; sequences; adaptive transmission; broadband mobile communications; cyclic extended spread code; downlink; guard chips; high code utilization efficiency; micro cellular system; modified M-sequence; multi-code CDM transmission scheme; multipath fading; parallel transmission scheme; performance analysis; radio channel estimation; third generation CDMA system; uplink; Bit rate; Broadband communication; Channel estimation; Delay effects; Fading; Mobile communication; Multiaccess communication; Multimedia communication; Performance analysis; Propagation delay;
Conference_Titel :
Personal Wireless Communications, 1997 IEEE International Conference on
Conference_Location :
Mumbai
Print_ISBN :
0-7803-4298-4
DOI :
10.1109/ICPWC.1997.655537
