Self-adaptive ICI inter-carrier interference cancellation method and device

Abstract

The invention provides a self-adaptive ICI inter-carrier interference cancellation method and device. The method is characterized by including the following steps: performing first stage processing onreceived data to obtain a processing result of a first stage; calculating to obtain a first level signal-to-noise ratio result by utilizing the processing result of the first stage; estimating an ICIinter-carrier interference value by utilizing the processing result of the first stage, and performing corresponding cancellation on the received data based on the ICI inter-carrier interference value to obtain first stage cancelled data; performing second stage processing by using the first stage cancelled data to obtain the processing result of a second stage; calculating to obtain a second level signal-to-noise ratio result by utilizing the processing result of the second stage; and comparing a size of the first level signal-to-noise ratio result with the size of the second level signal-to-noise ratio result, and selecting the processing result corresponding to the larger one to output. According to the method, an equalization result corresponding to the high SNR is selected through comparison of the size of the two SNRs, thereby avoiding the problem of performance reduction caused by inaccurate ICI estimation.

Description

technical field [0001] The present invention relates to multimedia transmission and mobile communication technology, in particular to a device for eliminating ICI (Inter-Carrier Interference, Inter-Carrier Interference) in an OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) system. Background technique [0002] OFDM, as a physical layer air interface technology with high spectrum efficiency, has been widely used in DVB-T2, ATSC3.0, LTE and other multimedia transmission, mobile communication standards and systems. [0003] In the OFDM system, the channel is divided into several orthogonal sub-channels (ie, sub-carriers), so that high-speed data signals can be converted into parallel low-speed sub-data streams, modulated and transmitted on each sub-carrier. Due to the narrow bandwidth of sub-carriers, each sub-data flow is equivalent to flat fading propagation, and because of the orthogonality between sub-carriers, each sub-data str...

AI Technical Summary

Problems solved by technology

When the channel condition is good, the accuracy of the channel estimation is guaranteed, and the ICI elimination module can provide positive gain; while when the channel condition is bad, the accuracy of the channel estimation may be poor, and the ICI elimination module may provide a positive gain to the system at this time. negative gain

Images