| 摘要 |
The invention discloses an M-element parallel combination Chirp spread spectrum air sound wave communication method, and the method comprises steps: signal transmitting and signal receiving. The method comprises the steps: generating a Chirp sequence set which is formed by the construction of Chirp signals; enabling to-be-transmitted digital information to be modulated by an M-element parallel combination Chirp spread spectrum modulation unit into a modulation signal; inserting a synchronous signal and a time protection interval before the modulation signal, so as to form a transmission signal; carrying out the time synchronization of the received signal, obtaining the starting time of a sound signal, and recovering original digital information of a digital signal part through an M-element parallel combination Chirp spread spectrum demodulation unit. The method provided by the invention can effectively improve the utilization rate of conventional Chirp spread-spectrum frequency bands, neutralizes a multi-path effect and a Doppler effect in an air sound channel, is low in calculation complexity, is large in processing gain, is strong in resistance to the Doppler effect, and is convenient to use in an intelligent terminal with audio receiving and transmitting equipment. |
