摘要
无线数字对讲机具有即时通信、经济实用、成本低廉、使用方便以及无需通信费等优点,因此广泛应用在民用、军用、紧急事件处理等方面,尤其在紧急事件处理以及没有手机网络覆盖的情况下,无线数字对讲机更加显示出它的不可取代的地位。本论文的主要工作是分析DMR数字对讲机的基带关键算法,并介绍了一种基于MCU和DSP的DMR新型通信协议的数字对讲机终端的基带模块的硬件设计。
本论文首先概要地介绍了数字移动无线(DMR)标准及无线对讲机的发展现状和项目背景;其次介绍了在基带信号处理过程中,各个逻辑信道所采用的信道编解码方案,包括CRC、卷积编码、维特比译码、交织等并对全速率语音信道的误码率进行了仿真;然后对GMSK调制和解调的原理进行了详细地公式推导和说明;最后详细说明了信道编解码及GMSK调制和解调实现的过程、调试方法及结果。
Wireless digital interphone is economical and practical with advantages of instant communication, low cost and convenience to use and free communication cost. Therefore, it is widely used in civil fields and conducting emergencies. Especially in the cases of emergency conducting and environment without mobile network covering, wireless digital interphone plays a remarkable and irreplaceable role. This thesis puts focus on the analysis of the key algorithms for baseband in DMR digital interphone and introduces an innovative hardware design for digital interphone terminal baseband module based on MCU and DSP of DMR new communication protocols.
The thesis introduces DMR generally along with the current development and research background of wireless digital interphone. Secondly, it introduces the various channel encoding and decoding programs in the processing, including CRC, Convolutional coding, Viterbi decoding, interleaving etc. and simulates the error rate of full-rate voice channels. Thirdly, it gives a detailed formulas and instructions for the principle of GMSK modulation and demodulation. Finally, it illustrates in details on the generation process of channel encoding and decoding and GMSK modulation and demodulation along with the debugging methods and results.
引文
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