A Channel Estimation Method for Underwater Acoustic Orthogonal Frequency Division Multiplexing
An orthogonal frequency division and channel estimation technology, which is applied in the field of channel estimation to reduce Gaussian noise and interpolation error, can solve the problem of increasing transmit power, etc., and achieve the effects of improving accuracy, improving decision performance, and reducing interpolation error
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[0032] 1. Based on the comb-shaped pilot structure, the LS algorithm is used to estimate the channel information at the pilot
[0033] Due to the complex and changeable underwater acoustic environment, the communication channel is in a fast fading environment, and the channel characteristics will also change significantly within one OFDM symbol, and the comb pilots are evenly distributed in each OFDM symbol, which is The continuous distribution has a strong anti-fading ability and is suitable for fast fading channels, so the channel estimation method based on the comb structure is selected. The inserted pilots should satisfy the following requirements in time domain and frequency domain respectively:
[0034] N f ≤ 1 τ max ΔF c - - - ( 1 ...
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