MIMO-HARQ communication system and communication method

A technology for communication systems and determination methods, applied in the field of HARQ, capable of solving problems such as retransmission

Inactive Publication Date: 2009-09-09
FUJITSU LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

But all these schemes are only applicable to vertically coded MIMO communication systems, in which, if an error is detected in a data block after the CRC check, even if only one data block has an error, all two data streams need to be retransmitted
There is currently no method for optimizing retransmission quality for horizontally coded MIMO communication systems

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  • MIMO-HARQ communication system and communication method

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Embodiment Construction

[0032] Refer below Figure 4 Now, the MIMO-HARQ communication system of the present invention will be described.

[0033] Same as the previous description of the prior art, the horizontal coding MIMO communication system of the present invention is described by taking two transmitting antennas and two-layer data streams as examples. However, the present invention is not limited to this case, and more than two transmitting antennas and more than two layers of data streams or a vertical coding MIMO communication system may also be used.

[0034] In the initial transmission, the data block Block is sent through the transmitting antenna 1 and 2 respectively 1，0 and Block 2，0 . If it is detected that there is an error in the received data stream 1 through the CRC check at the receiver (it may also be that there is an error in the received data stream 2, and the processing for this is similar to the following), then in the next transmission time slot by sending Antenna 2 to retr...

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Abstract

The invention relates to an MIMO-HARQ communication system and a communication method. When a receiver performs CRC check on received data streams and detects that a data stream has errors, the receiver feeds back to a transmitter to request the retransmission of the data stream, and the transmitter determines the corresponding relation between the data stream to be transmitted and a plurality of antennae according to a mode of retransmitting the data stream by other transmitting antennae except a transmitting antenna which transmits the data stream with the errors. The transmission and the retransmission of a same data stream go through different space fading channels so that not only a time diversity gain is obtained through the retransmission, but also an additional space diversity gain is obtained by changing the transmitting sequence, and the probability of successful transmission is improved.

Description

technical field [0001] The present invention relates to HARQ (Hybrid Automatic Repeat Request) in MIMO (Multiple-Input Multiple-Output) communication systems, and more particularly to HARQ (Hybrid Automatic Repeat Request) for MIMO (including single-user MIMO, that is, data sent to multiple antennas from the same user , and multi-user MIMO, that is, the data sent to multiple antennas comes from different users) HARQ of the communication system. Background technique [0002] The MIMO communication scheme has been accepted as a part of many industry standards (such as 3GPP LTE, IEEE802.16E [1]), which spatially multiplexes multiple data streams at the transmitter and multiplexes these data streams at the receiver. Demultiplexing, so that the data transmission rate can be increased without occupying more frequency and time resources, so that the spectrum efficiency can be significantly improved. Generally, it is necessary to combine FEC (Forward Error Correction Coding) with M...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/18H04B7/06
CPCH04L1/1893H04L1/06H04B7/061
Inventor 周华林宏行
Owner FUJITSU LTD
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