A method of adding reference signal in chirp modulation signal
A technology of reference signal and modulated signal, applied in the field of communication, can solve the problems of reduced transmission efficiency, difficulty in inserting pilot frequency, etc.
Active Publication Date: 2022-02-22
北京新光微电科技有限公司
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Problems solved by technology
If too many pilots are inserted, the transmission efficiency of the entire system will decrease, so inserting Chirp symbols as pilots is very limited
[0011] So far, there is no perfect pilot insertion mechanism in the Chirp communication field. In addition, the Chirp signal has a real-time change relationship between frequency and frequency in the frequency domain, and it is difficult to insert pilots in Chirp spread spectrum communication.
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[0085] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic idea of the present invention, and the following embodiments and the features in the embodiments can be combined with each other if there is no conflict.
[0086] Wherein, the accompanying drawings are for illustrative purposes only, and represent only schematic diagrams, rather than physical drawings, and should not...
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The invention relates to a method for adding a reference signal in a Chirp modulation signal, which belongs to the technical field of communication. The method includes the following steps: in the power meter reading transmitting end, firstly, Turbo channel coding is performed on the sending service data block to generate the coded data block; the coded data block is modulated by the service Chirp, specifically, "1" in the data block is represented by upper Chirp symbol data , "0" in the data block is represented by the lower Chirp symbol data; at this time, the sender generates reference Chirp symbol data locally. In Chirp modulation communication systems, there is no similar concept of OFDM system time-frequency resources, so there is no way to directly insert pilot information into Chirp symbol data for channel feature estimation. For channels with severe multipath and frequency selective fading, the transmission performance of Chirp modulation is affected, so the present invention proposes a method for adding reference signals in Chirp symbols.
Description
technical field [0001] The invention belongs to the technical field of communication and relates to a method for adding a reference signal in a Chirp modulation signal. Background technique [0002] Chirp Spread Spectrum (CSS) is an important spread spectrum method in spread spectrum communication. The instantaneous frequency of Chirp signal changes linearly with time within one symbol period, and has good autocorrelation characteristics, so it is a typical spread spectrum signal. Because Chirp signal pulse compression has good and strong immunity to frequency offset and Doppler frequency shift, high multipath resolution, and small peak-to-average power ratio of transmitted signals, the CSS communication system has many advantages, such as strong anti-interference ability , insensitive to frequency offset and Doppler frequency shift, low system complexity, low power consumption, etc., so it is widely used in various IoT systems. [0003] The Chirp modulation communication ...
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IPC IPC(8): H04B1/707H04L5/00H04L25/02H04L1/00
CPCH04B1/707H04L5/0048H04L25/0224H04L25/0226H04L1/0071H04L1/0045H04L1/0041H04B2001/70724
Inventor 毛翔宇文康郑建宏段红光
Owner 北京新光微电科技有限公司