DocumentCode :
2989393
Title :
Channel estimation using time multiplexed pilot symbols for coherent RAKE combining for DS-CDMA mobile radio
Author :
Andoh, H. ; Sawahashi, M. ; Adachi, E.
Author_Institution :
R&D Dept, NTT Mobile Communications Network, Kanagawa, Japan
Volume :
3
fYear :
1997
fDate :
1-4 Sep 1997
Firstpage :
954
Abstract :
Coherent DS-CDMA forward and reverse links periodically transmitting pilot symbols every data slot to estimate the fading channels are considered; Np-pilot systems are placed at the beginning of each data slot. A pilot symbol-assisted channel estimation scheme that uses weighted multi-slot averaging (WMSA) is presented for coherent RAKE combining. The BER performance achievable by WMSA coherent RAKE combining is evaluated by computer simulations under multipath Rayleigh fading environments and compared with those of other channel estimation methods. For the DS-CDMA reverse link, fast transmit power control (TPC) based on measured signal-to-interference plus noise ratio (SINR) is employed so the simulation also considers fast closed loop TPC. It is demonstrated by computer simulations that the required signal energy per bit-to-background noise power spectrum density ratio (Eb/N 0) can be reduced by about 0.8 dB compared to RAKE combining using simple linear interpolation and that the Eb/N0 loss from the ideal channel estimation is as small as 0.5 dB both with and without antenna diversity. The BER performance achievable by the time multiplexed pilot is also compared with that of the parallel pilot channel
Keywords :
Rayleigh channels; cellular radio; diversity reception; fading; interpolation; land mobile radio; multipath channels; power control; pseudonoise codes; radio links; radiofrequency interference; spread spectrum communication; telecommunication control; time division multiplexing; BER performance; DS-CDMA mobile radio; SINR; antenna diversity; background noise power spectrum density ratio; cellular personal/mobile radio systems; channel estimation; coherent RAKE combining; computer simulations; data slot; fading channels estimation; forward links; linear interpolation; multipath Rayleigh fading; parallel pilot channel; pilot symbol-assisted channel estimation; pilot symbols transmission; reverse links; signal energy per bit; signal-to-interference plus noise ratio; time multiplexed pilot; time multiplexed pilot symbols; transmit power control; weighted multi-slot averaging; Bit error rate; Channel estimation; Computer simulation; Diversity reception; Fading; Multiaccess communication; Power control; Power measurement; Rayleigh channels; Signal to noise ratio;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 1997. Waves of the Year 2000. PIMRC '97., The 8th IEEE International Symposium on
Conference_Location :
Helsinki
Print_ISBN :
0-7803-3871-5
Type :
conf
DOI :
10.1109/PIMRC.1997.627027
Filename :
627027
Link To Document :
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