Title :
RAKE reception with maximal-ratio and equal-gain combining for DS-CDMA systems in Nakagami fading
Author :
Alouini, Mohamed-Slim ; Kim, Sang Wu ; Goldsmith, Andrea
Author_Institution :
California Inst. of Technol., Pasadena, CA, USA
Abstract :
We study coherent binary direct-sequence code division multiple access (DS-CDMA) systems operating over frequency-selective Nakagami fading channels. In particular a performance comparison between maximal-ratio combining (MRC) and equal-gain combining (EGC) RAKE receivers is considered. For interference limited systems, perfect MRC RAKE receivers can accommodate about 5m/(5m-1) more users than EGC RAKE receivers, where m is the Nakagami fading parameter. MRC has a higher rate of improvement than EGC as the number of combined paths increases. However, imperfect or inaccurate channel fading estimation leads to serious degradation in the performance of MRC receivers and in that case EGC becomes superior to MRC
Keywords :
code division multiple access; diversity reception; fading; land mobile radio; radio receivers; spread spectrum communication; DS-CDMA systems; EGC; MRC; RAKE receivers; RAKE reception; channel fading estimation; coherent binary direct-sequence code division multiple access; combined paths; degradation; equal-gain combining; frequency-selective Nakagami fading channels; interference limited systems; maximal-ratio combining; performance comparison; Bit error rate; Degradation; Diversity reception; Fading; Frequency; Multiaccess communication; Multipath channels; Power system modeling; RAKE receivers; Transmitters;
Conference_Titel :
Universal Personal Communications Record, 1997. Conference Record., 1997 IEEE 6th International Conference on
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-3777-8
DOI :
10.1109/ICUPC.1997.627256
