Energy efficient channel estimation strategy for MIMO-OFDM system

This paper analyzes the relationship between pilot value setting and channel estimation accuracy. By specific decomposition of the process to improve the estimation accuracy of channel, it defi-nitely proposes that the channel estimation can be divided into two parts: improvement of pilot point estimation accuracy and interpolation accuracy. Then it provides corresponding methods. For the mobile time-varying channel of transmitting diversity, we propose an orthogonal and uniform distributed pilot setting strategy based on MMSE rule of channel estimation. The strategy offers quantitative analysis to the relationship between different multi-antenna pilot interpolation algorithms and estimation accuracy. On this basis, for the defects in traditional DFT channel estimation algorithms, we adopt transforming domain filtering iterations to decrease Gaussian noise and the influence on estimation of the disturbance among carriers. Then an iteration algorithm for simple and effective channel estimation is proposed. The simulations show that, the improved pilot has smaller estimated mean square error, especially in bad case of fast mobile speed. From the perspective of system implementation, our strategy can keep normal work and better system performance.