Abstract
sent when sending and the next (the retransmission) change between distributing the spreading code of the data to be transmitted. For example when the transmission of the first packet (first transmission) using spreading codes # 0 to spread symbols 1-4 and when the transmission of the second packet (retransmission) using spreading codes # 1 to spread symbol 1 - 4 . Therefore the de-spread signal symbols received by combining and receiving device can be removed with extremely low receiving level of the received symbols so as to improve the reception quality.
The spreading codes to be assigned to data to be transmitted are changed between a transmission time and the next one (retransmission time). For example at a transmission of the first packet (first transmission) symbols 1-4 are spread with a spreading code #0 while at a transmission of the second packet (retransmission) the symbols 1-4 are spread with a spreading code #1. As a result combining despread signals of the symbols received by the receiving apparatus a plurality of times can eliminate received symbols having extremely low reception levels so that reception quality can be improved.
The spreading codes to be assigned to data to be transmitted are changed between a transmission time and the next one (retransmission time). For example at a transmission of the first packet (first transmission) symbols 1- 4 are spread with a spreading code #0 while at a transmission of the second packet (retransmission) the symbols 1- 4 are spread with a spreading code #1. As a result combining despread signals of the symbols received by the receiving apparatus a plurality of times can eliminate received symbols having extremely low reception levels so that reception quality can be improved.
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