Radio receiving device and transmitting and receiving device

A transmitting and receiving device comprising:

• a transmitting device;
• a receiving device;
• and
• a controller, wherein
• the receiving device includes
• a first frequency converting circuit, which, in operation, frequency-converts a radio-frequency received signal having a gain adjustment period, a channel estimation period, and a signal reception period into a baseband received signal,
• at least one first frequency characteristic correcting circuit, which, in operation, generates a corrected baseband received signal by amplifying the baseband received signal on the basis of a first gain code and correcting a first frequency characteristic in the baseband received signal on the basis of a first frequency characteristic code,
• at least one first filter circuit, which, in operation, generates a filtered baseband received signal by cutting off a band below a first cutoff frequency of the corrected baseband received signal on the basis of a cutoff frequency code,
• an analog/digital conversion circuit, which, in operation, quantizes the filtered baseband received signal a digital received signal using a first number of bits based on a first number of bits code, and
• a first digital signal processing circuit, which, in operation, demodulates the digital received signal and estimates a first frequency characteristic,
• the transmitting device includes
• a second digital signal processing circuit, which, in operation, modulates transmission data through digital signal processing to a digital transmission signal,
• a digital/analog conversion circuit, which, in operation, converts the digital transmission signal using a second number of bits based on a second number of bits code to an analog transmission signal,
• at least one second filter circuit, which, in operation, generates a filtered analog transmission signal by cutting off a band below a second cutoff frequency of the analog transmission signal,
• at least one second frequency characteristic correcting circuit, which, in operation, amplifies the filtered analog transmission signal on the basis of a second gain code and corrects a second frequency characteristic in the analog transmission signal on the basis of a second frequency characteristic code, and
• a second frequency converting circuit, which, in operation, frequency-converts the analog transmission signal to a radio-frequency transmission signal, and
• the controller, in operation, sets the first and second frequency characteristic code, the first and second gain code, the cutoff frequency code, and the first and second number of bits code.

A radio receiving device comprising:

• a frequency converting circuit, which, in operation, frequency-converts a radio-frequency received signal having a gain adjustment period, a channel estimation period, and a signal reception period into a baseband received signal;
• at least one frequency characteristic correcting circuit, which, in operation, generates a corrected baseband received signal by amplifying the baseband received signal on the basis of a gain code and correcting a frequency characteristic in the baseband received signal on the basis of a frequency characteristic code;
• at least one filter circuit, which, in operation, generates a filtered baseband received signal by cutting off a band below a cutoff frequency of the corrected baseband received signal on the basis of a cutoff frequency code;
• an analog/digital conversion circuit, which, in operation, quantizes the filtered baseband received signal into a digital received signal using a number of bits based on a number of bits code;
• a digital signal processing circuit, which, in operation, demodulates the digital received signal and estimates a frequency characteristic;
• and
• a controller, which, in operation, sets the frequency characteristic code, the gain code, the cutoff frequency code, and the number of bits code,
• wherein during the gain adjustment period, the controller
• sets the cutoff frequency code to a first cutoff frequency higher than a second cutoff frequency during the channel estimation period, and
• sets the number of bits code to a first number of bits smaller than a second number of bits during the channel estimation period.