| Single-Carrier frequency domain equalization (SC-FDE), with the advantage of low complexity and good equalization results, has been used to eliminate the inter-symbol interference (ISI) generated by multi-path channels in many communication systems. This paper aims at designing a long-distance wireless communication system used in UHF (Ultra High Frequency) band, based on the technology of SC-FDE. Besides, the synchronization algorithm and channel parameter estimation algorithm used by the system’s receiver are also studied in detail. Finally, this paper shows the bit-error rate (BER) performance by using computer simulation.Main works of this paper are as follows:(1)This thesis studies the characteristics of UHF band channel firstly and selects400MHz as the carrier frequency for the target system. Then, based on the existing UHF radio channel characteristics, a set of multi-path channel models are built combined with the characteristics of Rayleigh fading channel and effects of Doppler shift.(2) Considering that inter-symbol interface occurred under high-speed transmission is very long and the transmission characteristics of systems are nonlinear, we finally choose frequency domain equalization scheme for the target system rather than the OFDM, GMSK time-domain equalization and CPM frequency-domain equalization systems.(3) In consideration of the receiver’s unknown of the signal arrival time and channel parameters and there is possibility of frequency offset, this paper studies the synchronization, channel and noise estimation algorithms in the receiver.(4) This thesis also studies the system BER performance with nonlinear models. According with the different delay and fading characteristics under UHF band, the paper also simulates the Rayleigh fading multi-path channel. At last, this paper simulates the overall system performance based on the proposed multipath channel models. |
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