Simulation communication system-based test system and channel simulator

Abstract

The invention discloses a simulation communication system-based test system and a channel simulator. The performance test of frequency offset correction equipment under a super-speed mobile environment in a simulation communication system can be realized. The system comprises base station simulation equipment, the channel simulator, frequency offset correction equipment and a tester, wherein the base station simulation equipment is used for generating a primary signal and transmitting the primary signal to the channel simulator; the channel simulator is used for respectively determining level strength S1 and S2 of signals which are received by a mobile terminal which moves on a mobile track and transmitted by a first remote radio-head (RRH) module and a second RRH module, determining frequency f'1 and f'2 after doppler frequency shift, generating a first signal according to the S1, the f'1 and the primary signal, generating a second signal according to the S2, the f'2 and the primary signal, and transmitting the first signal and the second signal to the frequency offset correction equipment; the frequency offset correction equipment is used for respectively compensating the first signal and the second signal to obtain the compensated first signal and second signal; and the tester is used for determining the compensation performance of the frequency offset correction equipment.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a test system and a channel emulator based on a simulated communication system. Background technique [0002] High-speed mobile scenarios are the difficulty of cellular wireless communication coverage. In high-speed scenarios (such as scenarios where mobile terminals are located on high-speed trains), due to Doppler shift, rapid channel changes, and signal multipath, etc., It will cause problems such as poor reception of downlink signals by mobile terminals, high call drop rate, handover failure rate and channel bit error rate. The existence of Doppler frequency shift and multipath leads to the degradation of the coherent demodulation performance of the base station and the mobile terminal as the signal transmission source, and directly affects the cell selection, cell reselection, handover and other performance of the mobile terminal. In order to solve these problems, at ...

AI Technical Summary

Problems solved by technology

However, considering the particularity of the railway coverage of communication signals, only relying on the base station function cannot bring a good experience to users, so the industry proposes to install Doppler frequency shift correction on-board repeater equipment on high-speed trains (such as Correction repeater) and upgrading the frequency offset correction function of the mobile terminal and a series of downlink frequency offset correction function solutions to improve communication quality

However, how to simulate the high-speed mobile environment of mobile terminals in the laboratory to assist in the performance verification of deviation correction repeaters and mobile terminals with frequency offset correction functions has always been a major problem in the industry.

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