Radio communication system, transmission system, radio terminal and radio communication method

A transmission system comprising:

• a first radio communication device configured to superimpose a first signal sequence and a first delay signal sequence which is generated by delaying the first signal sequence, and transmit a first superimposed signal including the first signal sequence and the first delay signal sequence;
• a second radio communication device configured to superimpose a second signal sequence and a second delay signal sequence which is generated by delaying the second signal sequence by a delay amount different from a delay amount of the first delay signal sequence, and to transmit a second superimposed signal including the second signal sequence and the second delay signal sequence using the same frequency band as the first signal sequence in the same time range as the first signal sequence;
• and
• a notification unit configured to notify the radio terminal of first delay information about the first delay signal sequence and second delay information about the second delay signal sequence.

A radio terminal comprising:

• a receiver configured to receive a first signal sequence and a second signal sequence in the same time range from a transmission system including a first radio communication device transmitting the first signal sequence and a second radio communication device transmitting the second signal sequence using the same frequency band as the first signal sequence in the same time range as the first signal sequence;
• and
• a separation processor configured to execute separation processing to separate the first signal sequence and the second signal sequence received by the receiver,
• wherein
• the receiver receives the first signal sequence, a first delay signal sequence generated by delaying the first signal sequence, and first delay information about the first delay signal sequence,
• the receiver receives the second signal sequence, a second delay signal sequence generated by delaying the second signal sequence by a delay amount different from a delay amount of the first delay signal sequence, and second delay information about the second delay signal sequence, and
• the separation processor combines the first signal sequence and the first delay signal sequence in accordance with the first delay information, and also combines the second signal sequence and the second delay signal sequence in accordance with the second delay information, when executing the separation processing.

A radio communication method comprising the steps of:

• by a first radio communication device, superimposing a first signal sequence and a first delay signal sequence which is generated by delaying the first signal sequence, and transmitting a first superimposed signal including the first signal sequence and the first delay signal sequence;
• by a second radio communication device, superimposing a second signal sequence and a second delay signal sequence which is generated by delaying the second signal sequence by a delay amount different from that of the first delay signal sequence, and transmitting a second superimposed signal including the second signal sequence and the second delay signal sequence using the same frequency band as the first signal sequence in the same time range as the first signal sequence;
• notifying a radio terminal of first delay information about the first delay signal sequence and second delay information about the second delay signal sequence by a transmission system including the first radio communication device and the second radio communication device;
• by a receiver of the radio terminal, receiving the first superimposed signal and the second superimposed signal in the same time range from the transmission system, and receiving the first and second delay information;
• combining the first signal sequence and the first delay signal sequence in accordance with the notified first delay information by a separation processor of the radio terminal when executing separation processing, the separation processor configured to execute the separation processing to separate the first signal sequence and the second signal sequence received by the receiver;
• and
• combining the second signal sequence and the second delay signal sequence in accordance with the notified second delay information by the separation processor of the radio terminal when executing the separation processing.