Communication apparatus, communication system, communication method, control circuit, and storage medium

A communication method comprising:

• performing despreading processing on a received signal subjected to direct spread processing;
• detecting a plurality of signals included in the received signal subjected to the despreading processing;
• estimating an amount of delay in each of the plurality of detected signals;
• extracting a subcarrier including a pilot signal from the received signal on a basis of the estimated amounts of delay;
• performing direct spread processing on the extracted pilot signal by using a spreading sequence used by a source of transmission of the received signal for performing direct spread processing;
• and
• performing transmission path estimation processing on the basis of the pilot signal subjected to the direct spread processing.

A control circuit to control a communication apparatus,

• the control circuit causing the communication apparatus to execute:
• performing despreading processing on a received signal subjected to direct spread processing;
• detecting a plurality of signals included in the received signal subjected to the despreading processing;
• estimating an amount of delay in each of the plurality of detected signals;
• extracting a subcarrier including a pilot signal from the received signal on a basis of the estimated amounts of delay;
• performing direct spread processing on the extracted pilot signal by using a spreading sequence used by a source of transmission of the received signal for performing direct spread processing;
• and
• performing transmission path estimation processing on the basis of the pilot signal subjected to the direct spread processing.

A non-transitory storage medium storing a program to control a communication apparatus, the program causing the communication apparatus to execute:

• performing despreading processing on a received signal subjected to direct spread processing;
• detecting a plurality of signals included in the received signal subjected to the despreading processing;
• estimating an amount of delay in each of the plurality of detected signals;
• extracting a subcarrier including a pilot signal from the received signal on a basis of the estimated amounts of delay;
• performing direct spread processing on the extracted pilot signal by using a spreading sequence used by a source of transmission of the received signal for performing direct spread processing;
• and
• performing transmission path estimation processing on the basis of the pilot signal subjected to the direct spread processing.