Based on the Berlekamp-Massy （BM） algorithm for Reed-Solomon（RS） decoding, an improved version is proposed, which focuses on how to find the error locator polynomial using least iterative operations. The condition...Based on the Berlekamp-Massy （BM） algorithm for Reed-Solomon（RS） decoding, an improved version is proposed, which focuses on how to find the error locator polynomial using least iterative operations. The conditions to end the iterative operations is derived. As a special case, criterion of only one error symbol in one received codeword is derived as well. Steps are listed concerning the implementation of the improved iterative decoding algorithm, which is carried out as software on the platform of TI＇s C6416 DSP. Decoding performance and decoding-delay of both improved and original algorithms under different （n,k） conditions are simulated. The results of simulations demonstrate that the improved algorithm has less computational complexity when the number of errors in a received codeword is relatively small. Therefore, in channels with low noise power spectrum density, the improved algorithm results in less decoding-delay than BM algorithm.展开更多
针对DSP系统数据安全防护的应用需求,在不改变DSP功能的基础上提出一种基于AES算法的新安全应用机制.该机制单独集成AES解密模块,通过软件实现数据的传输控制,优化AES算法并采用解密密钥预先写入OTP(One Time Programable)的方式代替密...针对DSP系统数据安全防护的应用需求,在不改变DSP功能的基础上提出一种基于AES算法的新安全应用机制.该机制单独集成AES解密模块,通过软件实现数据的传输控制,优化AES算法并采用解密密钥预先写入OTP(One Time Programable)的方式代替密钥扩展模块的设计,降低硬件设计的复杂度,以最优的资源实现数据的安全防护功能.为保证面积的兼容一致性,通过优化布局,将版图密度由原先的55%提升到70%,电路一次设计成功,用户使用结果表明,在100MHz工作频率下,电路的安全性能、数据处理速度及电特性参数均满足系统的应用需求.展开更多
基金Sponsored by the National High Technology Research and Development Program of China ("863"Program) (2007AA01Z293)
文摘Based on the Berlekamp-Massy （BM） algorithm for Reed-Solomon（RS） decoding, an improved version is proposed, which focuses on how to find the error locator polynomial using least iterative operations. The conditions to end the iterative operations is derived. As a special case, criterion of only one error symbol in one received codeword is derived as well. Steps are listed concerning the implementation of the improved iterative decoding algorithm, which is carried out as software on the platform of TI＇s C6416 DSP. Decoding performance and decoding-delay of both improved and original algorithms under different （n,k） conditions are simulated. The results of simulations demonstrate that the improved algorithm has less computational complexity when the number of errors in a received codeword is relatively small. Therefore, in channels with low noise power spectrum density, the improved algorithm results in less decoding-delay than BM algorithm.
文摘针对DSP系统数据安全防护的应用需求,在不改变DSP功能的基础上提出一种基于AES算法的新安全应用机制.该机制单独集成AES解密模块,通过软件实现数据的传输控制,优化AES算法并采用解密密钥预先写入OTP(One Time Programable)的方式代替密钥扩展模块的设计,降低硬件设计的复杂度,以最优的资源实现数据的安全防护功能.为保证面积的兼容一致性,通过优化布局,将版图密度由原先的55%提升到70%,电路一次设计成功,用户使用结果表明,在100MHz工作频率下,电路的安全性能、数据处理速度及电特性参数均满足系统的应用需求.
