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.