Transmitting method and receiving method of preamble signal in ultra-high-speed mobile broadband communication

Abstract

The invention provides a transmitting method and a receiving method of a preamble signal in ultra-high-speed mobile broadband communication. The sending method comprises the following steps: generating a time domain leader sequence A with the length of N, generating a time domain preamble symbol D with the length of L, taking D as a minimum unit, cascading and expanding for any length to form a preamble symbol P, cascading data symbols behind the preamble symbol P to form a sending signal baseband frame B, enabling the baseband frame B to pass through a sampling filter to obtain a filtered baseband frame signal S so as to limit the bandwidth of the baseband signal, performing up-conversion on the baseband frame signal S to form a radio frequency signal, and sending the radio frequency signal outwards. Compared with the prior art, the method has a good cross-correlation characteristic under an extremely low signal-to-noise ratio, and the calculation complexity is greatly reduced, so that chip processing resources are saved and the information operation speed is increased.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a method for sending and receiving a leading signal in ultra-high-speed mobile broadband communication. Background technique [0002] With the rapid development of the aviation field, supersonic (approximately equal to Mach 1) manned and unmanned aerial vehicles are bound to be widely used in the future. The mobile communication between aircraft and aircraft, and between aircraft and the ground under ultra-high-speed movement has important research significance. Prior art literature (C.Yeh et al., "Theory and Technology for Standard WiMAX Over Fiber in High Speed ​​Train Systems," in Journal of Lightwave Technology, vol.28, no.16, pp.2327-2336, Aug.15, 2010.) The wireless communication that supports the mobile speed above Mach 2 is called ultra-high-speed mobile communication. In ultra-high-speed communication, the communication distance between the aircraft is gen...

AI Technical Summary

Problems solved by technology

However, as the length of the symbol increases, the complexity of the correlation calculation will increase exponentially, and a large amount of hardware resources will be consumed, making it impossible to complete fast synchronization at an extremely low SNR

Although the working point of the synchronous acquisition scheme in the document "Research on Signal Synchronous Acquisition Technology under Extremely Low SNR" (Liu Qinggang, Zou Shengfu, Hu Fei. "Communication Technology", 2016, 49(12):1614-1618.) can reach -25dB, but still needs L for its calculation 2 Multiple complex multiplication operations and N-point FFT operations, high complexity

[0008] In summary, the existing technology cannot complete synchronous detection with low complexity under extremely low signal-to-noise ratio

Images