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

An immune network and dynamic channel technology, applied in multi-frequency code systems, baseband system components, shaping networks in transmitters/receivers, etc., can solve problems such as system performance degradation and inability to obtain optimal system parameters, etc. Achieve the effects of suppressing inter-symbol interference, eliminating multipath effects, and easily determining the number of hidden nodes

Inactive Publication Date: 2008-08-20
SHANGHAI JIAO TONG UNIV
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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

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

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Embodiment Construction

[0026] The technical solution of the present invention will be described in detail below with reference to the drawings and embodiments: this embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation modes and specific operation processes are given, but the protection scope of the present invention It is not limited to the following embodiments.

[0027] The method in this embodiment is based on an orthogonal frequency division multiplexing system, such as figure 1 As shown, in the transmission part of the orthogonal frequency division multiplexing system, the training data is added after the pilot is inserted, and framed together with the source data packet. The content and insertion position of the training data are fixed, and then zero padding and IFFT are performed. And after adding the cyclic prefix, transmit to the wireless channel;

[0028] After wireless channel transmission, in the receiving part, after remov...

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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 the parameter 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 a better 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 the broadband wireless digital communication system, the most important type of interference that affects the high-speed transmission of information is the frequency selective fading caused by the multipath effect of the channel. At present, the most concerned method to overcome frequency selective fading is multi-carrier technology represented by orthogonal frequency division multiplexing (OFDM) technology, through the use of frequency division multiplexing that allows sub-channel spectrum overlap but does not affect each other Method to transmit data in parallel, this method not only can obtain higher spectrum utilization, but also has strong anti-pulse noise and anti-multipath fading a...

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Application Information

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IPC IPC(8): H04L25/03H04L27/26
Inventor 臧小刚宫新保常成凌小峰
Owner SHANGHAI JIAO TONG UNIV
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