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| Analysis and Optimization of Pilot Symbol Assisted Two Dimensional
Spread Spectrum Systems in Multi-path Fading Channels |
| Shao Shi-hai; Tang You-xi; Qi ji; Li Shao-qian; Song Li-jun |
National key Lab of Communication, University of Electronic Science and Technology of China,
Chengdu 610054, China |
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Abstract This paper investigates the bit error rate performance influence due to variation of the power of the pilots in pilot symbol assisted BPSK modulated general two-dimensional spread spectrum systems in Rayleigh fading propagation environments. Under the circumstance, that the system’s total transmitting power is fixed, the pilot to data power ratio is optimized analytically. Simulation results accord with theoretical conclusions, both of which illuminate that the optimum pilot to data power ratio is determined by the parameters of multipath fading channels such as SNR, Doppler frequency and multipath delay. The characteristic of low pass filter also affects the optimum pilot to data power ratio.
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Received: 29 November 2004
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2006, Vol. 28 
