Radio transmission device, radio reception device, and radio communication system

A radio receiving apparatus that receives radio packets transmitted by using a plurality of streams in a radio communication system employing a hybrid ARQ (Automatic Repeat Request), the radio receiving apparatus comprising:

• a decoding unit that decodes original transmission data from a received packet;
• and
• a retransmission control unit that generates an ACK signal and a NACK signal based on a result of the decoding and returns the ACK signal and the NACK signal to a transmitter, wherein
• the retransmission control unit sets an error detection threshold indicative of a number of times of error detection for each of the transmission data and returns the NACK signal when number of times of error detection by the decoding unit exceeds the error detection threshold.

A radio communication system that employs a hybrid ARQ (Automatic Repeat Request) and transmits and receives radio packets using a plurality of streams, the radio communication system comprising:

• a transmitter including
• a packet generating unit that generates a plurality of transmission packets from single transmission data and arranges the transmission packets in a space direction such that the transmission packets can be simultaneously transmitted;
• and
• a transmitting unit that separately carries out predetermined transmission processing on each of the transmission packets arranged in the space direction and simultaneously transmits the transmission packets using streams corresponding to the transmission packets;
• and
• a receiver including
• a decoding unit that decodes original transmission data from a received packet;
• and
• a retransmission control unit that sets, in processing for generating an ACK signal and a NACK signal based on a result of the decoding and returning the ACK signal and the NACK signal to a transmitter, an error detection threshold indicative of a number of times of error detection for each of the transmission data and returns the NACK signal when number of times of error detection by the decoding unit exceeds the error detection threshold.