| Summary: | 碩士 === 國立臺灣大學 === 電子工程學研究所 === 106 === In this paper we proposed a short-distance communication Smart Badge System which communicates through wireless channel and integrates the transceivers into licensed-free 416MHz bands. Modulation format of Smart Badge is DQPSL due to simplicity. The system design of Smart Badge is focusing on low complexity and dealing with some non-linear effect. The system is multiple users transmission system, every packet may have different Carrier frequency offset and clock offset, so each time we receive packet, we need to synchronize again. Besides our system adopts random access mode protocol that its packet arrival time is unknown, so packet synchronization is necessary.
We design and implement a low complexity Smart Badge base station receiver based on software defined radio module. We choose bladeRF SDR module, because it is suitable for our system specification. Due to its zero-IF architecture, we need to deal with some non-linear effect by DSP functions. Such as IQ imbalanced compensation, AGC, DC offset compensation and packet detection and confirm. The parameter we choose is simulation by assume SNR=10-15dB. We use Matlab to implement DSP function. The PER is about 13.46%,
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