Receiving device, receiving method, and receiving system

A receiving system, comprising:

• a reception signal input device which inputs a reception signal of a radio wave;
• an equalization processor which performs equalization processing of the reception signal;
• and
• a sound signal output device which outputs an equalized signal,
• wherein the reception signal input device comprises:
• an array antenna comprising multiple antennas that receive radio waves of a desired wave;
• and
• front ends configured to perform frequency conversion of the received multiple signals, respectively,
• wherein the sound signal output device comprises:
• an output signal amplifier that amplifies the equalized signal;
• and
• a sound output device that outputs an amplified signal as a sound signal, and
• wherein the equalization processor comprises multiple delay equalizers that respectively receive multiple reception signals, and performs equalization processing of spatial equalization and temporal equalization on the reception signals, the equalization processor being configured to:
• obtain a first error which is a difference between an output of one specific tap in the multiple delay equalizers and a predetermined reference value, and calculate a first weight with which the first error is minimized;
• cause a calculation result of the first weight to be reflected in all taps in the multiple delay equalizers except the specific tap, obtain a second error which is a difference between outputs of all taps in the multiple delay equalizers and the predetermined reference value, and calculate a second weight with which the second error is minimized;
• and
• update coefficients of all taps in the multiple delay equalizers at the same timing using the calculation result of the first weight and a calculation result of the second weight, and calculate an output of the equalization processor.

A receiving method to be performed in a receiving device, the receiving device comprising:

• an equalization processor which comprises multiple delay equalizers that respectively receive multiple reception signals through an array antenna, and which performs equalization processing of spatial equalization and temporal equalization on the reception signals, the receiving method comprising:
• obtaining a first error which is a difference between an output of one specific tap in the multiple delay equalizers and a predetermined reference value, and calculating a first weight with which the first error is minimized,
• causing a calculation result of the first weight to be reflected in all taps in the multiple delay equalizers except the specific tap, obtaining a second error which is a difference between outputs of all taps in the multiple delay equalizers and the predetermined reference value, and calculating a second weight with which the second error is minimized, and
• updating coefficients of all taps in the multiple delay equalizers at the same timing using the calculation result of the first weight and a calculation result of the second weight, and calculating an output of the equalization processor.