中国科学院自动化研究所机构知识库

随着智能电网技术的不断发展和应用，各种电力业务的传输需求呈现爆炸式的增长，这给电力无线通信服务提出了更严峻的挑战。为满足移动数据业务海量增长需求、移动网络的业务安全需求以及节能通信的需求，业界已积极开展针对电力无线通信系统关键技术的研究。基于4G LTE关键技术研究设计的LTE230系统，不仅具有覆盖范围广、支持海量终端连接以及安全性高等特点，而且能够实现高传输速率和业务适应性强的用户体验，为智能电网配用电应用了提供了高效的无线通信解决方案。根据对电力无线通信专网的研究现状分析，本文将围绕LTE230系统的物理层关键技术展开研究，为发送端和接收端硬件设备的制造、检验、使用和验收提供数据支撑，具体研究内容如下：

（1）针对传统CIC滤波器运算过程中内部积分器累加引起数据溢出的问题，提出了一种Nobel恒等式的等效CIC滤波器设计方案。首先，将梳状器前移与积分器组成积分梳状器，理论分析表明CIC滤波器的输出结果与输入信号序列的长度无关，能够极大减缓比特增长而带来的系统性能衰减。然后，提出了相应的滤波定点化设计方案，仿真结果证明了所设计方案的高效性。

（2）针对同步检测中的传统相关检测算法在低信噪比下的性能下降问题，提出了一种可降低噪声方差影响的改进型相关检测算法，此算法可以看作是传统算法的数学近似，可同时适用于PSS检测和SSS检测。然后，提出了相应的定点化设计方案，并针对非线性运算，使用查表法来平衡定点精度和运算速度。此外，并进行了同步链路的具体设计与实现，仿真结果表明新算法在低信噪比情况下能够获得显著的性能增益，并且定浮点性能差异不大。

（3）针对UCI在PUCCH上的传输进行了具体设计与实现，首先分别介绍了上行控制信道的发送端和接收端的处理流程，并对整个PUCCH进行了模块设计和算法实现，然后深入研究了PUCCH实现过程中所需的关键技术，包括编译码、信道估计、噪声方差估计以及均衡，并提出了相应的定点化方案，仿真结果证明了所设计方案的正确性。

With the continuous development and application of smart grid technology, the demand of various power transmission business increases dramatically, which brings a huge challenge to the power wireless communication services. To meet the requirement of explosive growth in mobile data business service, the requirement of service security in mobile network and the reqirement of energy saving communication, the industry has actively carried out the reaseach on the key technologies of the power wireless communication system. Based on key technologies of 4G LTE, LTE230 system can not only has the characteristics of wide coverage, supporting massive terminal connection and high security, but also can realize the user experience of high transmission rate and strong business adaptability, and provides a a hign-efficiency wireless communication solution for smart grid power distribution application. Based on the analysis of the current research status of power wireless communication private network, the dissertation will forcus on the key technologies of physical layer of LTE230 system to provide data support for the manufacturing, inspection, use and acceptance of hardware equirement at the transmitter and receiver.

For the case that data overflow is caused by the accumulation of internal integrators in the operation of conventional CIC filter, an equivalent CIC filter design scheme based on Noble identity is proposed. First, the comb is moved forward to form an integrator comb, theoretical analysis shows that the output of CIC filter is independent of the length of input signal sequence, and can greatly reduce the system performance degradation caused by bit growth. Then, the corresponding filtering fixed-point design scheme is proposed, and the simulation results verify the effectiveness of the designed scheme.

For the case that the performance of correlation detection algorithm in conventional synchronous detection is degraded under low signal-to-noise ratio, an improved correlation detection algorithm is proposed. The algorithm is a mathematical approximation of the conventional cross correlation algorithm, which reduces the influence of noise variance and can be applied to both PSS detection and SSS detection. Then, the corresponding fixed-point design scheme is proposed, and for the nonlinear operation, the look-up table method is used to balance the precision of fixed point and operation speed. In addition, the specific design and implementation of the synchronization link are realized. The simulation results show that the new algorithm can obtain significant performance gain in the case of low signal-to-noise ratio, and the fixed-point performance difference is not significant.

For the case that the transmission of UCI on PUCCH is desined and implemented, first, the processing procedure of transmitter and receiver is introduced, respectively, modular design for the entire uplink control channel and the algorithm of each module is implemented. Then, the technologies needed in the realization of PUCCH are deeply studied, including encoding and decoding, channel estimation, nosie variance estimation and equalization, the corresponding filtering fixed-point design scheme is proposed, and the simulation results verify the correctness of the designed scheme.