BIT ERROR RATE PERFORMANCE OF PI/4-DQPSK IN A FREQUENCY-SELECTIVE FAST RAYLEIGH FADING CHANNEL

被引:39
作者
LIU, CL
FEHER, K
机构
[1] Department of Electrical Engineering, and Computer Science, University of California, Davis, CA
基金
美国国家航空航天局;
关键词
D O I
10.1109/25.97510
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
The bit error rate (BER) performance of pi/4-DQPSK modems in cellular mobile communication systems is derived and analyzed. The system is modeled as a frequency-selective fast Rayleigh fading channel corrupted by additive white Gaussian noise (AWGN) and co-channel interference (CCI). The probability density function of the phase difference between two consecutive symbols of M-ary DPSK signals is first derived. In M-ary DPSK systems, the information is completely contained in this phase difference. For pi/4-DQPSK, the BER is derived in a closed form and calculated directly. Our numerical results show that for the 24 kBd (48 kb/s) pi/4-DQPSK operated at carrier frequency 850 MHz and C/I < 20 dB, the BER will be dominated by CCI if the vehicular speed is below 100 mi/h. In our derivation, frequency-selective fading is modeled by two independent Rayleigh signal paths. Only one co-channel is assumed in our derivation. However, the approach used is readily applicable to multipath, multi-CCI, and ACI systems. The results obtained are also shown to be valid for discriminator detection of M-ary DPSK signals.
引用
收藏
页码:558 / 568
页数:11
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