基于随机计算方法的体域网通信技术研究

发布时间：2018-08-30 07:46

【摘要】：数字信号处理具有统计特性,而在传统的通信系统设计中,这一特性并没有被很好的利用,传统通信计算实现的是精确计算,实际上,在通信信号处理的过程中,有时运算精度满足一定的统计特性即可。譬如体域网通信中的同步采用本地序列进行相关运算进行包头检测和载波频偏检测,对于短距离通信且单载波系统,载波频偏的估计可以省略,因此只需要做包头检测,对相关结果的精确度要求不高,只要能判断峰值即可。在随机计算中,参与运算的操作数都是概率域的数值,其计算结果是以正确计算结果为均值并满足一定统计特征的随机变量。随机计算的基本思想就是将序列中含比特1的个数占整个序列长度的比例表征数值,而实际运算单元中,数据对应的操作通过简单的门级运算实现。本文首先基于随机计算的思想,设计了随机计算乘法器,对比常规运算单元,分析了概率乘法器中的误差来源,并做了优化,使得精确度有了一定的提高。通过对概率乘法器单元的硬件实现,验证了其在面积、功耗等方面相比传统乘法器的优势。此外基于概率乘法器,对体域网接收机同步模块中的本地序列相关器进行了仿真,验证在不同的标准下,概率相关器替代传统相关器的可行性。
[Abstract]:The digital signal processing has the statistical characteristic, but in the traditional communication system design, this characteristic is not well utilized, the traditional communication computation realizes the accurate calculation, in fact, in the communication signal processing process, Sometimes the operation accuracy can satisfy certain statistical characteristics. For example, in bulk area network communication, the local sequence is used to perform correlation operation for packet head detection and carrier frequency offset detection. For short distance communication and single carrier system, the estimation of carrier frequency offset can be omitted, so only packet head detection is needed. The accuracy of the related results is not high, as long as the peak value can be judged. In random calculation, the operands involved in the operation are all the values of the probability domain, and the results are random variables with the correct calculation results as the mean value and satisfying certain statistical characteristics. The basic idea of random computation is to represent the value of the number of bits in the sequence in proportion to the length of the whole sequence, but in the actual operation unit, the corresponding operation of the data is realized by simple gate operation. In this paper, based on the idea of random calculation, a random computing multiplier is designed, and the error source in the probability multiplier is analyzed and optimized, which improves the accuracy of the multiplier. The hardware implementation of the probabilistic multiplier unit verifies its advantages over the traditional multiplier in area and power consumption. In addition, based on the probabilistic multiplier, the local sequence correlator in the synchronization module of the bulk area network receiver is simulated to verify the feasibility of replacing the traditional correlator with the probabilistic correlator under different standards.
【学位授予单位】：复旦大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN92

【相似文献】