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| 1 | On the Linear Complexity of New Generalized Cyclotomic Binary Sequences of Order Two and Period pqr显示文摘Periodic sequences over finite fields, constructed by classical cyclotomic classes and generalized cyclotomic classes, have good pseudorandom properties. The linear complexity of a period sequence plays a fundamental role in the randomness of sequences. Let p, q, and r be distinct odd primes with gcd(p–1, q–1)=gcd(p–1, r –1)=gcd(q–1, r –1)=2. In this paper, a new class of generalized cyclotomic sequence with respect to pqr over GF(2) is constructed by finding a special characteristic set. In addition, we determine its linear complexity using cyclotomic theory. Our results show that these sequences have high linear complexity, which means they can resist linear attacks. | Longfei Liu Xiaoyuan Yang Xiaoni Du Bin Wei | 2016 | Tsinghua Science and Technology2016，21，3： | 4 |
| 2 | LDPC码最优化译码算法显示文摘为了提高离散高斯信道下二进制低密度奇偶校验码(low-density parity-check code,LDPC)最优化译码算法的性能和效率,提出了一种改进的LDPC码最优化译码算法。首先,通过理论分析和数学推导,构建了译码问题的数学模型;然后,论证并给出了针对该模型的最优化译码算法;最后,基于VC6.0平台进行了译码的性能和效率仿真并与其他算法进行比较。仿真结果表明,在误码率性能和译码效率上,新算法优于改进前的算法;在误码率性能上,新算法也优于常用的最小和译码算法。仿真结果与理论分析吻合。 | 林志国 彭卫东 林晋福 檀蕊莲 宋晓鸥 | 2014 | 系统工程与电子技术2014，36，9： | 0 |
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