| This subject is to design and implement the radio frequency parts needed in mounting four sets of sample road side unit (RSU) of the dedicated short-range communication system (DSRC) in intelligent transportation system (ITS) after analyzing the modular function, parameters required and learning the latest development abroad and domestically. Similar to other kind of communication systems, the radio frequency modular of RSU in DSRC include many parts such ad antenna, duplexer, low noise amplifier (LNA), local oscillator, mixer, filter, modulator, demodulator, and so on. It's difficult to analyze every part in the system fully, so the emphasis is mainly on the parts designed and implemented for the RSU by myself. In addition to present the final implement, I introduce the design principles detailedly in LNA part, hoping to demonstrate there are many other choices on LNA design. I discuss some of the problems on my designing power amplifiers. In local oscillator (LO) part, I mainly analyze the phase noise performance and the design of phase-locked loop, which affect the LO performance significantly. Due to the highly integrated modu/demodulate chip include many functions, I present the implement in addition to give introduce to related functions. The parts implemented by other members of the group, such as filters, I merely presented the picture of the part. As to the products bought from manufactory directly such as antenna, duplexer and isolator, I have no analysis on them.Thanks to experts and professors' instructions and the help of other members in the subject group, I have managed to fulfill my tasks in the subject and the test result seems satisfying. |
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