Radio receiver, radio receiving method, and recording medium

A radio receiver for receiving a signal having a signal format that is transmitted while changing transmission conditions into two types or more, comprising:

• a gain controlling means for controlling a gain of the radio receiver;
• an electric field intensity detecting means for detecting an electric field intensity of a received signal;
• a gain control threshold setting means for automatically setting a threshold of an electric field intensity level used as a gain control threshold based on a transmission data speed of the received signal, wherein said threshold setting is varied depending on said transmission data speed;
• and
• a first controlling means for causing the gain controlling means to start the gain control operation when the electric field intensity detected by the electric field intensity detecting means reaches the threshold of the electric field intensity level set by the gain threshold setting means.

A radio receiver comprising:

• a gain controlling means for controlling a gain of the radio receiver;
• an error rate measuring means for measuring an error rate of the received signal;
• a gain control amount setting means for setting a gain control amount of the gain controlling means in response to the error rate;
• and
• a second controlling means for causing the gain controlling means to change the gain in response to the gain control amount, wherein
• the gain control amount setting means decides a change direction and/or a change amount of the gain control amount in a succeeding reception based on a measured result by the error rate measuring means in a present reception and a measured result by the error rate measuring means in a preceding reception.

A radio receiver comprising:

• a gain controlling means for controlling a gain of the radio receiver;
• an error rate measuring means for measuring an error rate of the received signal;
• a gain control amount setting means for setting a gain control amount of the gain controlling means in response to the error rate;
• and
• a second controlling means for causing the gain controlling means to change the gain in response to the gain control amount, wherein
• the gain control amount setting means decides a change direction and/or a change amount of the gain control amount in a succeeding reception based on a measured result by the error rate measuring means in a present reception, a measured result by the error rate measuring means in a preceding reception, the gain control amount set in a present reception, and a set value of the gain control amount in the preceding reception.

A radio receiving method used for a radio receiver including a gain controlling means for controlling a gain of the radio receiver, an electric field intensity detecting means for detecting an electric field intensity of a received signal, and an error rate measuring means for measuring an error rate of the received signal, comprising:

• an error rate measuring step of measuring the error rate in the receiving step by the error rate measuring means;
• a threshold setting step of setting a threshold of electric intensity level based on the measured error rate of the received signal, wherein said threshold setting is varied depending on a transmission condition;
• and
• a first controlling step of causing the gain controlling means to start the gain control operation when the electric field intensity detected by the electric field intensity detecting means reaches the threshold of electric intensity level.

A radio receiving method used for a radio receiver including a gain controlling means for controlling a gain of the radio receiver, and an error rate measuring means for measuring an error rate of the received signal, comprising:

• a gain control amount setting step of setting a gain control amount of the gain controlling means in response to a measured result of the error rate measuring means;
• a second controlling step of causing the gain controlling means to change a gain in response to the gain control amount;
• a receiving step of performing a reception at the set gain control amount;
• and
• an error rate measuring step of measuring the error rate in the receiving step by the error rate measuring means;
• and
• wherein the gain control amount setting step decides a change direction and/or a change amount of the gain control amount in a succeeding reception based on a measured result by the error rate measuring means in a present reception and a measured result by the error rate measuring means in a preceding reception.

A radio receiving method used for a radio receiver including a gain controlling means for controlling a gain of the radio receiver, and an error rate measuring means for measuring an error rate of the received signal, comprising:

• a gain control amount setting step of setting a gain control amount of the gain controlling means in response to a measured result of the error rate measuring means;
• a second controlling step of causing the gain controlling means to change a gain in response to the gain control amount;
• a receiving step of performing a reception at the set gain control amount;
• and
• an error rate measuring step of measuring the error rate in the receiving step by the error rate measuring means;
• and
• wherein the gain control amount setting step decides a change direction and/or a change amount of the gain control amount in a succeeding reception based on a measured result by the error rate measuring means in a present reception, a measured result by the error rate measuring means in a preceding reception, the gain control amount set in a present reception, and a set value of the gain control amount in the preceding reception.