Method and device for transmitting mixed automatic retransmission request of multi-antenna communication system

Abstract

The invention relates to a hybrid automatic retransmission request transmitting method and a device of a multi-antenna communication system, which are applies to an air interface communication between a receiver and a transmitter. The hybrid automatic retransmission request transmitting method comprises the multi-antennal multiplexing step, the transmission diversity step, the initial transmission step, the retransmission request step, the retransmission processing step, the transmission diversity reprocessing step and the retransmission transmission step. The steps are completed. The transmission device comprises a multi-antenna multiplexing unit, a transmission diversity unit, a transmission processing unit and a transmission unit. Through phase rotation, the transmission diversity is realized; by utilizing the orthogonality of a retransmission signal and an initial transmission signal, the retransmission time diversity gain is acquired; the method and the device of the invention suits a multi-antenna system with the number of transmission antennas larger than that of receiving antennas, and can effectively improve the frame error rate performance of a system and improve the throughput of the system.

Description

technical field [0001] The present invention relates to a transmitting method and device in the technical field of wireless communication, in particular to a hybrid automatic repeat request transmitting method and device for a multi-antenna communication system. Background technique [0002] Using multi-antenna multiplexing on the transmitter and receiver of a wireless communication system can double the data rate of the system. Applying Hybrid Automatic Repeat Request (HARQ) and introducing retransmission time diversity can further improve the reliability of multi-antenna multiplexing transmission, so that the wireless communication system has a robust throughput. [0003] Currently, there are mainly two HARQ methods for multi-antenna multiplexing transmission. [0004] ①After receiving the retransmission request, the transmitter retransmits the original coded information as it is. After receiving the retransmission signal, the receiving end combines it with the first rec...

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Problems solved by technology

[0005] ②Aiming at the shortcomings of method ① that it is difficult to obtain retransmission time diversity gain under slowly changing channel conditions, a STBC MIMO-HARQ method is proposed in the document 3GPP, R1-061853, "STBC-HARQ for E-UTRA DL"

[0006] The above method ② uses the orthogonality between the retransmission signal and the initial transmission signal to introduce space diversity, which overcomes the shortcomings of method ① in the case of slowly changing channels, but under the condition of high-speed channels, due to the destruction of orthogonality, compared to ① There is no performance improvement, and it is only suitable for multiple antenna multiplexing systems with two transmissions and two receptions or two transmissions and multiple receptions

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