【摘要】 纠错编码是水声OFDM通信系统必须采用的关键技术。本文从译码性能和工程实现角度出发,采用卷积交织、卷积编码和Viterbi软译码相结合的差错控制方案,通过仿真和水池实验确定其参数,并在TMS320DM642上实现。在DSP实现时,卷积交织采用查表法,Viterbi译码采用蝶形运算宏定义等处理方法,极大地提升了运算速度,保证了卷积码的实时性。最后通过海洋实验验证了其译码性能。更多还原

【Abstract】 Error correction coding is a key technology in underwater acoustic OFDM communication system.Convolutional interleaving,convolutional coding and Viterbi soft decoding are implemented on TMS320DM642 in underwater acoustic OFDM system.Look-up table method used in convolutional interleaving and definition of butterfly macro in Viterbi decoding improve DSP computing speed and ensure real-time communication.Finally,the performance of the decoder in sea test is given.更多还原