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Method and device of HARQ

A technology of automatic request retransmission and retransmission, applied in the direction of correct operation test, error prevention/detection using return channel, etc., can solve the problems of increased system complexity, low throughput, low channel utilization, etc.

Inactive Publication Date: 2006-04-12
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0003] At present, there are mainly two types of schemes for the combination of these two technologies: one is the combination of low-density parity-check code and the second type (type-II) hybrid request retransmission technology, and this scheme requires all bits in a frame to be Retransmission, the channel utilization rate is not high, and the throughput is low; the second is the combination of low-density parity-check code and type-III hybrid request retransmission technology, that is, the incremental redundancy technology of low-density parity-check code , although this technology can guarantee good throughput characteristics, it will greatly increase the corresponding system complexity

Method used

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  • Method and device of HARQ

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Embodiment Construction

[0012] figure 1 It is a schematic diagram of the sending and receiving device of the present invention.

[0013] The specific workflow is as follows:

[0014] 1. The encoder receives the information sequence, and then encodes it using the non-regular low-density parity-check code method.

[0015] 2. The encoding result is output by the encoder and stored in the memory.

[0016] 3. After the information in the memory is sent out, noise is superimposed in the channel, and then reaches the receiver.

[0017] 4. The receiver receives the signal and stores the noise-superimposed signal in the memory.

[0018] 5. The signal enters the decoder for decoding.

[0019] 6. If the decoding is successful, the receiving end sends an acknowledgment signal (ACK) to the sending end through the reverse link, and the memory of the receiving end is cleared at the same time.

[0020] 7. When the sender receives the confirmation signal, delete the contents of the memory, and encode the informa...

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Abstract

A method of mixed ¿C automatic request repeat used in radio communication environment is a new and practical mixed ¿C automatic request retransmission scheme which can be realized by providing different bit protective degree to different degree distribution based on difference of LDPC code nodal degree distribution. The method can use quite small bandwidth to improve system performance obviously.

Description

technical field [0001] The present invention relates to a hybrid automatic repeat request (HARQ) method and device in a wireless communication system, in particular to a hybrid of low density parity check (Low Density Parity Check, LDPC) coded data transmission in a wireless communication system Automatic request resend technology. Background technique [0002] Nowadays, with the rapid development of wireless communication, wireless communication users have increasing demands for data services, and various high-speed data service solutions have emerged, almost all of which require the system to have the characteristics of low residual error rate and high throughput. Among them, adopting Low Density Parity Check (LDPC) code as channel coding combined with Hybrid Request Repeat (HARQ) is a widely used scheme. [0003] At present, there are mainly two types of schemes for the combination of these two technologies: one is the combination of low-density parity-check code and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/18H04L1/24
Inventor 曹一卿古建奇琳杨大成
Owner BEIJING UNIV OF POSTS & TELECOMM
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