OFDM sub-carrier allocation method based on generic algorithm
A genetic algorithm and orthogonal frequency division technology, applied in the field of wireless transmission, can solve the problems of poor connectivity and not fully exerting the diversity effect of the OFDM system, and achieve the effect of improving the data transmission rate, improving the speed of genetic evolution and improving the system performance.
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[0038] This embodiment is based on the traditional Rayleigh scattering channel model, and the channel is modeled as including six independently distributed multipath frequency-selective Rayleigh channels, and the amplitude decays according to an exponential. The maximum delay spread is 5μs, the maximum Doppler frequency shift is 30Hz, the total available power of the system is assumed to be 1W, the total available bandwidth is 1MHz, the total number of subcarriers is 64, and the average channel SNR is 38dB. For the different number of users in the system, 20 different channel implementations are simulated, and each channel implementation is sampled 50 times. For different users, a rate ratio limit condition is randomly set in advance.
[0039] The parameters of the genetic algorithm are shown in Table 1.
[0040] parameters
[0041] For the above parameter settings, the experiment simulates the system capacity and proportionality conditions of the multi-user OFDM sy...
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