Title :
Adaptive resolution control scheme for RAKE receiver using delay profile conversion technique in DS/CDMA systems
Author :
Sada, Tomokazu ; Sampei, Seiichi ; Morinaga, Norihiko
Author_Institution :
Graduate Sch. of Eng., Osaka Univ., Japan
fDate :
6/24/1905 12:00:00 AM
Abstract :
This paper proposes an adaptive resolution control scheme for a RAKE receiver in direct sequence/code division multiple access (DS/CDMA) systems to effectively resolve and combine multipaths for high-bit-rate wireless multimedia services. In the proposed scheme, the receiver measures a delay profile for the received signal with its resolution equal to the highest chip rate, estimates delay profiles for lower chip rates using a delay profile conversion technique, and selects a chip rate that maximizes the received signal to noise plus interference power ratio (SNIR) under a condition that the number of RAKE fingers is limited by a certain number. Computer simulation confirms that the proposed scheme with a 3-finger RAKE receiver can reduce the average transmit power by about 5 dB without degrading the transmission quality under a 30-ray Rayleigh fading channel.
Keywords :
Rayleigh channels; adaptive control; code division multiple access; delays; multimedia communication; multipath channels; radio receivers; spread spectrum communication; telecommunication control; DS/CDMA systems; RAKE finger; RAKE receiver; Rayleigh fading channel; adaptive resolution control scheme; chip rates; delay profile conversion technique; direct sequence code division multiple access; high-bit-rate wireless multimedia services; multipath; resolution; signal to noise plus interference power ratio; transmission quality; transmit power; Adaptive control; Control systems; Delay estimation; Fading; Multiaccess communication; Multimedia systems; Multipath channels; Programmable control; RAKE receivers; Signal resolution;
Conference_Titel :
Vehicular Technology Conference, 2002. VTC Spring 2002. IEEE 55th
Print_ISBN :
0-7803-7484-3
DOI :
10.1109/VTC.2002.1002981