Channel estimation methods based on decision feedback in shortwave narrowband FFH/BFSK system
A technology of channel estimation and decision feedback, applied in baseband system components, shaping network in transmitter/receiver, multi-frequency code system, etc., can solve problems such as demodulation influence, achieve simplified calculation complexity, and save resources The effect of spending
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[0030] The main innovation of the channel estimator of the present invention is to perform independent channel estimation for each sub-channel, and use decision feedback to iterate directly, which reduces pilot overhead and computational complexity, making it suitable for FFH / BFSK systems. Channel estimation can be implemented programmatically.
[0031] Computer simulation shows that 32 frequency hopping frequency points are taken, the frequency hopping interval is 20kHz, the frequency hopping frequency is 5000 hops / second, 1 bit data is sent per hop, and when the sampling rate is 1.28M, the LS decision feedback adopts sending a group every 2560 hops (64 hops ) pilot, the LMMSE decision feedback uses 640 hop pilots every 12800 hops. Compared with the perfect estimation, the performance difference between the two methods is about 1dB. Compared with the demodulation without channel estimation, both have about 5db performance improve.
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