Wraparound canceller, relay system, and wraparound cancelling method
A technology of loop interference and canceller, which is applied in the direction of radio relay system, active electrical relay system, orthogonal multiplexing system, etc. Circuit, impulse response incompleteness and other problems, to achieve the effect of miniaturization of the device, high-precision elimination of operation, and reduction of circuit scale
Inactive Publication Date: 2008-12-10
PANASONIC CORP
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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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[0070] Embodiments of the present invention will be described below with reference to the drawings.
[0071] Fig. 5 is a block diagram showing a model of a SFN relay system using a loop interference canceller. The mark "*" in the figure represents a convolution operation. In addition, unless otherwise specified, the following signals or responses are handled as complex numbers. Assuming that "(t)" represents a time-domain signal and "(w)" represents a frequency-domain signal, the definition in one domain is used to determine the definition in another domain at the same time.
[0072] The receiving unit 2 in FIG. 5 converts the RF (Radio Frequency, radio frequency) band signal into a baseband signal, and conversely, the transmitting unit 4 converts the baseband signal into an RF band signal. However, these frequency conversions do not have any essential impact on the present invention, so these frequency conversions will not be mentioned in the following unless otherwise spec...
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A loop interference canceller that performs high-speed, high-precision adaptive operation corresponding to temporal changes in the phase and level of a loop interference wave or a master station wave, and reduces the scale of the device. The loop interference canceller of the present invention obtains: the number of data points of the transmission path characteristic estimation part is limited, the overall frequency band is extended not by interpolation but by 0 insertion in the frequency domain and windowing after time domain transformation, and the processing cost is reduced. The number of data points is used to improve the speed of the adaptive operation of the loop interference canceller, thereby achieving a high degree of traceability of the time variation of the phase and level of the loop interference wave and the main station wave, and improving the accuracy of the internal processing, thereby enabling the execution of High-precision cancellation operation, reduction in circuit scale and miniaturization of the device and other advantageous effects.
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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IPC IPC(8): H04B7/015H04B7/15H04J11/00
CPCH04B7/15585
Inventor 国枝贤德四方英邦河合庆士林健一郎铃木一章
Owner PANASONIC CORP