Linear frequency modulation communication system and channel estimation method and device thereof, medium and chip
A channel estimation and linear frequency modulation technology, applied in the field of communication, can solve problems such as inaccurate channel estimation, symbol interference, and accuracy affecting system demodulation performance
Active Publication Date: 2021-12-03
BEIJING SMARTCHIP MICROELECTRONICS TECH COMPANY +1
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Problems solved by technology
[0006] However, in the direct modulation system of Chirp signals, it is necessary to perform channel estimation first to obtain the multipath impulse response before demodulating the subsequent Chirp signals, so the accuracy of channel estimation affects the demodulation performance of the entire system
In order to perform channel estimation, generally in the process of sending data symbols, the pilot symbols are sent at intervals, and then channel estimation is performed on the pilot symbols using the matched filter channel estimation method or the FFT (Fast Fourier Transform, Fast Fourier Transform) channel estimation method , to obtain the channel estimation value, but in the actual system, due to the influence of multipath, transmitter and receiver filters, there will be interference between symbols, resulting in inaccurate channel estimation
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[0081] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.
[0082] It should be noted that, in the direct modulation system of Chirp signals, when channel estimation is performed, pilot symbols can be sent at intervals during the process of sending data symbols, for example, pilot symbols and data symbols can be used figure 1 The transmission is performed in the manner shown, wherein every N symbols contains 1 pilot symbol, and N is a positive integer, which can be 4, 8, 16, etc. specifically.
[0083] In an actual system, due to the influence of the multipath environment and the filters ...
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The invention discloses a linear frequency modulation communication system and a channel estimation method and device thereof, a medium and a chip. The method comprises the following steps: demodulating data symbols before and after a next pilot symbol in advance according to a channel estimation value of a current pilot symbol to obtain contents of the data symbols before and after the next pilot symbol; and adjusting the initial position of the next pilot symbol according to the content of the next pilot symbol and the contents of the data symbols before and after the next pilot symbol, and performing channel estimation on the next pilot symbol from the initial position to obtain a channel estimation value of the next pilot symbol. Therefore, the initial position of the next pilot symbol is adjusted based on the content of the next pilot symbol and the contents of the front and back data symbols, and channel estimation is performed according to the adjusted initial position, so that the channel estimation performance and the demodulation performance of a linear frequency modulation signal can be effectively improved.
Description
[0001] Cross References to Related Applications [0002] This application claims the priority of the Chinese patent application with application number 202010941423.9 and titled "Chirp FM communication system and its channel estimation method and device, and storage medium" filed on September 09, 2020, the entire contents of which are incorporated herein by reference In this application. technical field [0003] The present invention relates to the technical field of communication, in particular to a linear frequency modulation communication system and a channel estimation method, device, medium and chip thereof. Background technique [0004] A linear frequency modulation signal is also called a bird sound (Chirp) signal, and a corresponding linear frequency modulation technology is also called a Chirp spread spectrum (Chirp Spread Spectrum, CSS) technology, or Chirp spread spectrum technology for short. Since Chirp spread spectrum technology has strong anti-interference, l...
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IPC IPC(8): H04L27/26
CPCH04L27/2695H04L27/2628Y02D30/70H04L25/0224H04B2001/6912H04B1/69
Inventor 赵东艳唐晓柯赵楠李德建赵旭胡毅刘浩邵瑾
Owner BEIJING SMARTCHIP MICROELECTRONICS TECH COMPANY