Dynamic channel equalization method for orthogonal frequency division multiplexing system based on immune network

Abstract

The invention relates to a balancing method of the dynamic channel of a frequency division multiplexing system based on an immunological network, belonging to the wireless communication signal processing technology field, comprising the steps of: step one, monitoring the current immunological network balancer, determining whether the channel environment has been changed; step two, if the current channel environment has been changed, initially adjusting the immunological network balancer adopting an initial immune response mechanism; step three, cloning amplify the immunological network balancer, getting the initial population of the immunological network balancer; step four, carrying out the immune operation based on the immune response mechanism and a vaccination mechanism, adjusting theparameter and structure of the immunological network balancer; step five, selecting the immunological network balancer which has the smallest training sample error as the final result of dynamic regulation, the balancing of wireless channel for the OFDM is realized, then returning to the monitoring state of the step one. The invention has strong robustness to the change of the channel, achieves abetter performance in the declined channel.

Description

technical field [0001] The invention relates to a method in the technical field of wireless communication signal processing, in particular to a dynamic channel equalization method of an orthogonal frequency division multiplexing system based on an immune network. Background technique [0002] In broadband wireless digital communication systems, the most important type of interference affecting high-speed information transmission is frequency selective fading caused by channel multipath effects. At present, the most concerned method to overcome frequency selective fading is multi-carrier technology represented by Orthogonal Frequency Division Multiplexing (OFDM) technology. The method transmits data in parallel, this method can not only get higher frequency spectrum utilization rate, but also has stronger anti-impulse noise and anti-multipath fading ability. [0003] The basic principle of OFDM is to distribute high-speed data streams to several sub-channels with relatively ...

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Problems solved by technology

[0006] After searching the prior art documents, it was found that "Channel Estimation for OFDM Systems Using Adaptive Radial BasisFunction Networks” (OFDM system channel equalization technology using adaptive radial basis function network), proposed to use adaptive RBF network based on gradient descent method to realize channel estimation and equalization of OFDM system. The essence of this method is The above is a linear method, which can realize the parameter adjustment of the RBF network relatively quickly, but when this method is used to train a highly nonlinear RBF network channel equalizer, the optimal value of the system parameters is often not obtained, resulting in a decline in system performance.

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