Title :
Performance of a new channel estimator for fast fading and high frequency offset in DS-CDMA/QPSK
Author :
Ko, Seokjun ; Lee, Kyungha ; Choi, Hyungjin
Author_Institution :
Dept. of Electron. Eng., Jung Kyun Kwan Univ., South Korea
Abstract :
The bit-error rate (BER) performance of a DS-CDMA/QPSK system taking into account the effect of fast fading and high frequency offset is analyzed. The performance is obtained by deriving the SNR of the demodulated signal as a function of the correlation between received signal values and estimated values of the channel estimator. The derived SNR shows that the conventional channel estimator using a single integrator structure has some problems such as the degradation of estimator´s performance from fast phase change. We propose a new channel estimator using a double integrator structure that is not affected by fast phase change. We also show the performance comparison between EQOC-QPSK and NEQOC-QPSK data modulation in third generation DS-CDMA. Finally, chip-based simulation is presented to confirm the derived BER performance
Keywords :
AWGN; Rayleigh channels; code division multiple access; correlation methods; demodulation; error statistics; modulation coding; parameter estimation; quadrature phase shift keying; radio receivers; spread spectrum communication; AWGN; BER; DS-CDMA/QPSK; EQOC-QPSK; NEQOC-QPSK; RAKE receiver; Rayleigh fading; SNR; bit-error rate; channel estimator; chip-based simulation; correlation; data modulation; demodulated signal; double integrator structure; equal orthogonal code; fast fading; fast phase change; high frequency offset; nonequal orthogonal code; performance; received signal values; single integrator structure; third generation DS-CDMA; Bit error rate; Fading; Frequency estimation; Multiaccess communication; Performance analysis; Phase estimation; Phase noise; Quadrature phase shift keying; Rayleigh channels; Working environment noise;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 1998. The Ninth IEEE International Symposium on
Conference_Location :
Boston, MA
Print_ISBN :
0-7803-4872-9
DOI :
10.1109/PIMRC.1998.731400
