Large-frequency-offset-resistant multi-system spread spectrum despreading method

The invention belongs to the technical field of spread spectrum communication, and particularly relates to a large-frequency-offset-resistant multi-system spread spectrum despreading method. The invention aims to improve the defects of a common dispreading technology, provides a large-frequency-offset-resistant multi-system spread spectrum dispreading method, and aims to reduce the influence of large frequency offset on a dispreading correlation value, reduce the signal-to-noise ratio loss caused by the large frequency offset and improve the error code performance of a system by utilizing piecewise correlation dispreading. 本发明属于扩频通信技术领域，具体涉及一种抗大频偏的多进制扩频解扩方法。本发明的目的在于改进普通解扩技术的不足，提供一种抗大频偏的多进制扩频解扩方法，利用分段相关解扩减小大频偏对解扩相关值的影响，减小大频偏引起的信噪比损失，提高系统误码性能。