Wraparound canceller, relay system, and wraparound cancelling method

Abstract

A wraparound canceller capable of performing adaptive operation to follow a wraparound wave, a parent station wave phase, and temporal level fluctuation at a high speed and with a high accuracy as well as reducing the device size. By limiting the number of data items of the transmission path characteristic estimation section and performing the extension to the entire band by 0 insert at the frequency region and windowing after the time region conversion instead of performing interpolation, the speed of adaptive operation of the wraparound canceller is increased because of the reduction in the number of processing data items. Accordingly, it is possible to realize a high capability to follow the wraparound wave, parent station wave phase, and the temporal level fluctuation and the internal processing becomes more accurate. Consequently, a highly accurate canceling operation can be performed and the circuit size is reduced, thereby realizing the reduced size of the device as a beneficial effect.

Description

technical field [0001] The present invention relates to a kind of loop interference canceller which utilizes the propagation path characteristic estimated from OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) signal to eliminate loop interference, especially such a loop interference canceller , Relay system and loop interference elimination method: Speed ​​up the speed of the adaptive operation of the loop interference canceller by reducing the number of processed data points, and achieve a high degree of time variation of the loop interference wave and master station wave phase and level Traceability, performing high-precision internal processing, thereby enabling high-precision cancellation operations, and realizing miniaturization of the device with a reduced circuit scale. Background technique [0002] In recent years, the use of the OFDM transmission method has been studied in the implementation of broadcast wave relay SFN (S...

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Problems solved by technology

[0054] However, in the above configuration, the transmission path characteristics of the entire signal band are first estimated by interpolating the transmission path characteristics using SP, and then the residual characteristics are calculated, thus increasing the number of data points used for processing and hindering high-speed Processing, in addition, the incompleteness of the impulse response of the low-pass filter used for interpolation (such as limited length) reduces the estimation accuracy of the transmission path characteristics, and there is also a problem that the low-pass filter requires a large-scale circuit

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