Method for estimating pulse noise in OFDM (Orthogonal Frequency Domain Multiplexing) underwater acoustic communication system
A technology of underwater acoustic communication and impulse noise, which is applied in the transmission system, baseband system, multi-frequency code system, etc., and can solve the problems of reducing the correct estimation of carrier frequency offset and interference of impulse noise estimation, etc.
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[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0029] The impulsive noise estimation method in an OFDM underwater acoustic communication system proposed by the present invention, its overall realization block diagram is as follows figure 1 As shown, it includes the following steps:
[0030] ① At the sending end of the OFDM underwater acoustic communication system, the sending end sends OFDM signal vector X, and X reaches the receiving end after being transmitted through the underwater acoustic channel, where the dimension of X is K×1, K≥1, and the underwater acoustic channel includes multiple Sub-paths generally include more than 10 sub-paths, and the Doppler frequency shift factors of each sub-path are different. During the transmission of X through the underwater acoustic channel, external interference and internal interference will be encountered. External interference includes Gaussian...
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