Reception device, reception signal processing method, control circuit, and recording medium

A reception device that receives a burst signal that arrives nonconsecutively in time, the device comprising:

• an equalization processor to perform an equalization process on a reception signal, the equalization processor including a linear filter and a nonlinear filter;
• a synchronization processor to perform a synchronization process of correcting an input reception signal;
• and
• a control information storage to store synchronization information indicating a synchronization state of a reception signal input to the equalization processor, and filter coefficients of the equalization processor, wherein
• the synchronization processor performs the synchronization process on a current reception signal using the synchronization information stored in the control information storage when processing a past reception signal, and
• the equalization processor performs an adaptive equalization process of outputting, to the synchronization processor, a result of addition of a reception signal filtered by the linear filter and a reception signal filtered by the nonlinear filter using the filter coefficients stored in the control information storage when processing the past reception signal.

A reception signal processing method, wherein

• a reception device that receives a reception signal executes:
• calculating a filter coefficient of a linear filter by making a propagation channel estimation using a known signal included in the reception signal;
• performing a synchronization process of correcting frequency deviation on a basis of a reception signal filtered by the linear filter in a first equalization process using the calculated filter coefficient;
• starting a second equalization process of outputting a result of addition of the reception signal filtered by the linear filter and a reception signal filtered by a nonlinear filter as a result of an equalization process when a predetermined condition is satisfied;
• and
• updating filter coefficients of the linear filter and the nonlinear filter using an adaptive algorithm.

A reception signal processing method, wherein

• a reception device that receives a burst signal that is nonconsecutive in time repeatedly executes:
• estimating a sampling timing and a phase of a reception signal using a known signal included in the reception signal;
• reading information indicating a sampling timing and a phase previously estimated and stored in a control information storage, and making a comparison with estimation results of a sampling timing and a phase of a current reception signal;
• correcting a reception signal on a basis of comparison results;
• performing an equalization process on the reception signal that is corrected, by using past filter coefficients stored in the control information storage, and updating a filter coefficient of each of a linear filter and a nonlinear filter using an adaptive algorithm;
• and
• storing, in the control information storage, timing phase information indicating the sampling timing and phase information indicating the phase estimated in the estimating, frequency information on the reception signal, and the filter coefficients.

A control circuit for controlling a reception device that receives a reception signal, the control circuit causing the reception device to execute:

• calculating a filter coefficient of a linear filter by making a propagation channel estimation using a known signal included in the reception signal;
• performing a synchronization process of correcting frequency deviation on a basis of a reception signal filtered by the linear filter in a first equalization process using the calculated filter coefficient;
• starting a second equalization process of outputting a result of addition of the reception signal filtered by the linear filter and a reception signal filtered by a nonlinear filter as a result of an equalization process when a predetermined condition is satisfied;
• and
• updating filter coefficients of the linear filter and the nonlinear filter using an adaptive algorithm.

A control circuit for controlling a reception device that receives a burst signal that is nonconsecutive in time, the control circuit causing the reception device to repeatedly execute:

• estimating a sampling timing and a phase of a reception signal using a known signal included in the reception signal;
• reading information indicating a sampling timing and a phase previously estimated and stored in a control information storage, and making a comparison with estimation results of a sampling timing and a phase of a current reception signal;
• correcting a reception signal on a basis of comparison results;
• performing an equalization process on the reception signal that is corrected, by using past filter coefficients stored in the control information storage, and updating a filter coefficient of each of a linear filter and a nonlinear filter using an adaptive algorithm;
• and
• storing, in the control information storage, timing phase information indicating the sampling timing and phase information indicating the phase estimated in the estimating, frequency information on the reception signal, and the filter coefficients.

A non-transitory recording medium storing therein a program for controlling a reception device that receives a reception signal, the program causing the reception device to execute:

• calculating a filter coefficient of a linear filter by making a propagation channel estimation using a known signal included in the reception signal;
• performing a synchronization process of correcting frequency deviation on a basis of a reception signal filtered by the linear filter in a first equalization process using the calculated filter coefficient;
• starting a second equalization process of outputting a result of addition of the reception signal filtered by the linear filter and a reception signal filtered by a nonlinear filter as a result of an equalization process when a predetermined condition is satisfied;
• and
• updating filter coefficients of the linear filter and the nonlinear filter using an adaptive algorithm.

A non-transitory recording medium storing therein a program for controlling a reception device that receives a burst signal that is nonconsecutive in time, the program causing the reception device to repeatedly execute:

• estimating a sampling timing and a phase of a reception signal using a known signal included in the reception signal;
• reading information indicating a sampling timing and a phase previously estimated and stored in a control information storage, and making a comparison with estimation results of a sampling timing and a phase of a current reception signal;
• correcting a reception signal on a basis of comparison results;
• performing an equalization process on the reception signal that is corrected, by using past filter coefficients stored in the control information storage, and updating a filter coefficient of each of a linear filter and a nonlinear filter using an adaptive algorithm;
• and
• storing, in the control information storage, timing phase information indicating the sampling timing and phase information indicating the phase estimated in the estimating, frequency information on the reception signal, and the filter coefficients.