An OQPSK frequency domain equalization wireless data transmission system and method

Abstract

The invention provides an OQPSK frequency domain equalization wireless data transmission system and method. The OQPSK frequency domain equalization wireless data transmission system comprises a transmitting end and a receiving end, and the transmitting end comprises an OQPSK modulation module, a training sequence insertion module, a leader sequence insertion module and a forming filtering module;The receiving end comprises a matching filtering module, a frame synchronization module, a frequency offset estimation and correction module, an equalization module and an OQPSK demapping module. An OQPSK module is arranged, and OQPSK is a constant envelope technology and has the advantages of being small in PAPR, high in frequency band utilization rate, high in power and the like, the design requirement of a transmitting end power amplifier is lowered, and meanwhile the design cost of the power amplifier is lowered. And an equalization module is arranged to remove intersymbol interference andprovide multipath interference resistance, and meanwhile, compared with direct expansion communication with the same anti-interference capability, the system has a higher information transmission rate, and can meet the high-speed + multipath interference resistance wireless communication requirement at the same time.

Description

technical field [0001] The invention belongs to the communication field, and relates to an OQPSK frequency domain equalized wireless data transmission system and method. Background technique [0002] At present, with the progress of society and the rapid development of science and technology, people have higher and higher requirements for the speed and accuracy of wireless communication, especially in industries such as drones, the demand for high-definition image transmission wireless communication systems is increasing. In the process of wireless communication, electromagnetic waves will encounter various obstacles when propagating in free space, resulting in phenomena such as refraction, reflection, and scattering. These phenomena will cause electromagnetic waves to generate multiple paths from the transmitting end to the receiving end. Because each path The transmission delay and fading are different, forming multipath interference in wireless communication. Multipath i...

AI Technical Summary

Problems solved by technology

However, since the commonly used single-carrier modulation methods (such as QPSK, etc.) are not constant-envelope modulation, the envelope fluctuates greatly through band-pass filtering after modulation, and even produces a zero-crossing envelope, although its PAPR is lower than that of OFDM systems. , but relative to the design requirements of the power amplifier is still unacceptable

Images