DocumentCode :
2544466
Title :
Oversampling diversity versus dual antenna diversity for chip-level equalization on CDMA downlink
Author :
Krauss, Thomas P. ; Zoltowski, Michael D.
Author_Institution :
Sch. of Electr. Eng., Purdue Univ., West Lafayette, IN, USA
fYear :
2000
fDate :
2000
Firstpage :
47
Lastpage :
51
Abstract :
We examine through numerical simulations the performance of three equalizers for CDMA downlink in which the channel is frequency-selective: the traditional RAKE receiver, and chip-spaced MMSE (minimum mean square error) and ZF (zero-forcing) equalizers. These simulation results provide an upper-bound on average BER performance for users near a single transmitting base-station, in which the channel is assumed static and known. We present results for two channel models: a random 4-path multipath channel with delay spread of 10 micro seconds, and an empirically derived random multipath channel generated by the commercial software package SMRCIM. We compare the cases of diversity obtained by two spatially separated antennas to two “virtual channels” obtained through oversampling a single antenna´s received signal. This simulation study has yielded the expected result that spatial diversity is preferable to diversity obtained via oversampling. Furthermore, the MMSE always out-performs both RAKE and ZF equalizers
Keywords :
antenna arrays; cellular radio; code division multiple access; diversity reception; equalisers; error statistics; least mean squares methods; multipath channels; numerical analysis; radio links; radio receivers; signal sampling; CDMA downlink; RAKE receiver; ZF equalizers; average BER performance; channel models; chip-level equalization; chip-spaced MMSE equaliser; delay spread; dual antenna diversity; empirically derived random multipath channel; frequency-selective channel; minimum mean square error equalizer; numerical simulations; oversampling; oversampling diversity; performance; random 4-path multipath channel; single transmitting base-station; software package SMRCIM; spatial diversity; spatially separated antennas; virtual channels; zero-forcing equalizer; Diversity methods; Downlink; Equalizers; Fading; Frequency; Mean square error methods; Multiaccess communication; Multipath channels; Numerical simulation; Receiving antennas;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Sensor Array and Multichannel Signal Processing Workshop. 2000. Proceedings of the 2000 IEEE
Conference_Location :
Cambridge, MA
Print_ISBN :
0-7803-6339-6
Type :
conf
DOI :
10.1109/SAM.2000.877966
Filename :
877966
Link To Document :
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