| The growing demand for wireless communications has led to the design of high performance wireless systems.The deeper fading,delay spread and Doppler effect are the higher constraints on the wireless communication signal-to-noise ratio.MIMO is a multi-input multi-output communication system.The optimal hopping patterns has ideal two-dimensional autocorrelation and cross-correlation function performance.In the MIMO system,the frequency hopping ratio is used to reduce or eliminate the interference caused by multipath delay and Doppler shift.At the same time,because the frequency hopping extends the spectrum of the signal,the MIMO space-time frequency hopping system also has the characteristics of anti-interference,anti-noise,anti-fading and easy networking.Firstly,the techniques related to MIMO principle and frequency hopping technology,space-time coding,frequency hopping synchronization and frequency hopping sequence design are briefly introduced.The structure of the space-time frequency hopping system is introduced,including the transmitter and receiver.Then,the construction method of the best hopping patterns based on algebra theory is introduced.Based on the Golomb Costas arrays,the optimal hopping patterns are constructed by two-dimensional cyclic shift method.The algebraic structure of the optimal hopping patterns and the correlation function(autocorrelation function and cross-correlation function)before and after cyclic shift are studied.Finally,the paper introduces how to apply the best hopping patterns to MIMO cellular mobile communication system and analyzes it.The results show that the best hopping patterns in MIMO system can effectively reduce or eliminate the multipath delay or Multi-antenna interference caused by Doppler shift,increasing system capacity and information transmission rate.The research results in this paper have deep reference value for reducing interference in MIMO system and improving system capacity and information transmission rate. |
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