Blind Carrier Frequency Offset Estimation in Wireless Receivers

The patent applies preliminary action by using over-sampling before the actual signal processing stage. The received signal is over-sampled by a factor of at least 2, which pre-processes the signal to contain redundant information that facilitates subsequent blind CFO estimation. This preliminary over-sampling enables the system to achieve accurate CFO estimation without requiring separate training signals, thus resolving the contradiction between estimation accuracy and time consumption.

The patent implements self-service by enabling the system to estimate and compensate for CFOs using its own over-sampled received signal without external training signals. The blind estimation algorithm processes the over-sampled signal directly, extracting CFO information and separating user signals autonomously. This eliminates the need for additional training signal transmission and processing infrastructure, reducing system cost while maintaining estimation accuracy.

The patent applies universality by designing a single receive antenna system that can handle multiple user signals simultaneously through blind separation techniques. The over-sampled received signal contains superimposed signals from multiple transceivers, and the proposed algorithm separates these signals and estimates their respective CFOs without requiring separate processing chains for each user. This multi-functional approach allows one receive antenna to serve multiple users, avoiding the need for multiple antennas per user and reducing hardware complexity.