Signal-to-interference ratio decision method in actual ICI (Inter-Carrier Interference) elimination of high-mobility OFDM (Orthogonal Frequency Division Multiplexing) cooperative system

Abstract

The invention discloses a signal-to-interference ratio decision method in actual ICI (Inter-Carrier Interference) elimination of a high-mobility OFDM (Orthogonal Frequency Division Multiplexing) cooperative system, which comprises the following steps of: (1) establishing a signal-to-interference ratio model of the capacity of the cooperative system, and analyzing the influence degree of the signal-to-interference ratio on the capacity of the system; (2) determining a value get method of the signal-to-interference ratio of the cooperative method according to a direct channel and the channel characteristics of the cooperative system; (3) calculating a signal-to-interference ratio range which can satisfy system performance requirements according to the signal-to-interference ratio model of the capacity of the cooperative system and the value get method of the signal-to-interference ratio; and (4) determining the elimination process of an elimination algorithm and evaluating the algorithm performance of the elimination algorithm according to the threshold of the signal-to-interference ratio. The method effectively solves the problem of the evaluation on elimination effect during the actual ICI elimination process by using the scheme of evaluating system performance by the signal-to-interference ratio, and the method greatly reduces calculation on the premise of having the same effect with a bit error index measurement elimination algorithm.

Description

technical field [0001] The invention relates to a signal processing method in wireless communication, in particular to a signal-to-interference ratio judgment method for eliminating interference between subcarriers in an OFDM cooperative system. Background technique [0002] According to the medium and long-term development plan of China's railways, by 2020, the mileage of China's high-speed railways with a speed of 200 kilometers per hour and above will exceed 18,000 kilometers, accounting for more than half of the total mileage of high-speed railways in the world. Therefore, the research on ground ultra-high-speed mobile broadband wireless communication system represented by high-speed railway has attracted more and more attention. Because the OFDM system has the advantages of high spectrum utilization rate and effective resistance to intersymbol interference (ISI), the OFDM broadband system can be used as an alternative for high-speed mobile communication systems. For OF...

AI Technical Summary

Problems solved by technology

There are many ICI elimination algorithms currently being studied. The ICI elimination algorithm using Doppler diversity designed by Kim Byung-Chul and Lu I-Tai, the single frequency compensation algorithm, the joint estimation method, and the equalization technology algorithm. After these methods are eliminated, the bit error performance can be obtained. However, it is very difficult to calculate the bit error rate in actual elimination, and it is difficult to know the degree of elimination

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