| Summary: | 碩士 === 國立暨南國際大學 === 通訊工程研究所 === 95 === The main purpose of this essay is to discuss the use of a feedback structure to change the a priori probabilities of bit 0 and bit 1 in a receiver receiving a synthesized signal and use the blind channel estimation method to estimate the exact channel. When the probabilities of bit 0 and bit 1 in the transmitter are randomly generated and the a priori probabilities of bit 0 and bit 1 in the receiver receiving a synthesized signal is 0.5, the estimated channel will be unsatisfactory and the bit error rate will be high. If the a priori probabilities of bit 0 and bit 1 in the receiver receiving a synthesized signal will change with the a priori probabilities of bit 0 and bit 1 in the transmitter, the estimated channel will be exact and the bit error rate will be low.
The feedback structure that we assumed corresponds to the case where the probabilities of bit 0 and bit 1 in the transmitter change; the a priori probabilities of bit 0 and bit 1 in the receiver receiving a synthesized signal will change as well. Due to the wide use of wireless communication in our life, we need to consider the case of several users communicating simultaneously. We use the TH-UWB system to achieve multiuser communication simultaneously by changing the TH code for every user. On the other hand, the feedback structure we assume will show good performance in the case of a single user, and we expect that we can obtain good performance in the case of multi-users too.
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