Signal processing and coding for control and traffic channel in IS-54 mobile phone

• Main Authors: Shieh, Jia-Horng, 謝嘉鴻
• Other Authors: C. Bernard Shung
• Format: Others
• Language: zh-TW
• Published: 1997
• Online Access: http://ndltd.ncl.edu.tw/handle/13055108305096212608

碩士 === 國立交通大學 === 電子工程學系 === 85 === In this thesis, three major tasts in the digital receiver of the IS-54specifications for the North American Digital Cellular (NADC) mobile phonesystem are investigated: 1) implement error control conding; 2) support callprocessing; and 3) act as the bridge of other modules in the baseband system. In implement error control coding, an {\em area-efficient} BCH decoder, interleaver and majority voting are presented. We also present anarea-efficient Viterbi decoder. The modified bi-directional zero-tailViterbi algorithm and the bi-directional tail-biting Viterbi algorithmare proposed to decoding the convolutional codings in IS-54 system.Comparing with the unidirectional Viterbi decoding, our Viterbiimplementation can apply for unidirectional (2, 1, 5) truncation, zero-tail(2, 1, 5) and tail-biting (4, 1, 5) by only to modified the branch- matricgenerator and the control sequence. Support call processing, we implement the analog control channel (FOCC,RECC) and the associated control channel in digital traffic channel (SACCH,FACCH) for call processing. Act as the bridge of other module, We implement the interface betweenequalizer, RF, speech coder and call processing --- ISA for the IS-54mobile system. For test our implementation in the signal processing and coding for control and traffic channel in IS-54 mobile phone, we use the FPGA toverify the area-efficient BCH decoder, Viterbi decoder, the interface withother modules, the whole analog control channel and part of digital trafficchannel.