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Rateless-code degree number distribution optimization method of cloud access network uplink

A rateless code, cloud access network technology, applied in digital transmission systems, electrical components, error prevention, etc., can solve problems such as reducing system transmission efficiency and large system signaling overhead

Active Publication Date: 2019-03-08
ZHEJIANG UNIV OF TECH
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Problems solved by technology

However, the traditional degree optimization method for AWGN channels requires the network center node to obtain the global network channel state information for optimization, which will bring a large system signaling overhead and reduce system transmission efficiency

Method used

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  • Rateless-code degree number distribution optimization method of cloud access network uplink
  • Rateless-code degree number distribution optimization method of cloud access network uplink
  • Rateless-code degree number distribution optimization method of cloud access network uplink

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Embodiment Construction

[0066] Below in conjunction with accompanying drawing and embodiment the present invention will be further described, but protection scope of the present invention is not limited thereto:

[0067] refer to figure 1 , the uplink transmission method based on rateless coding in the cloud access network under the block fading channel, specifically includes the following steps:

[0068] 1) User S uses rateless coding to encode the original information, here the code rate is R p The LDPC code of =0.95 is used as the precoding of the rateless code, and then carries out the LT coding that the output degree distribution is Ω (x);

[0069] 1.1) The first step, first use the code rate R p The LDPC code of =0.95 is used as the precoding of the rateless code to code the original information m into a code word c' of 10000 in length;

[0070] 1.2) The second step is to perform LT encoding on the codeword c' according to the degree distribution, and select d codewords from the precoding ob...

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Abstract

The invention discloses a rateless-code degree number distribution optimization method of cloud access network uplinks. The method is for a single-user uplink transmission system under block fading channels, a user uses rateless codes to encode original information, and sends information to remote radio heads (RRHs) after modulation, and the remote radio heads quantize received signals, and send quantized results to a baseband processing unit pool through high-speed forward-transmission links. The invention provides the single-user rateless-code transmission degree number optimization method for a case where only channel statistics information is known, and the problem of needing global real-time network information state information in traditional methods is avoided. The designed method of degree number distribution of the invention can improve system throughput.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a method for optimizing the distribution of code degree distribution of uplink rateless codes on a cloud access network under a block fading channel. Background technique [0002] Cloud Radio Access Network (C-RAN) is a revolutionary mobile network architecture that addresses many of the challenges operators face as they strive to support the growing demands of end users. Since C-RAN requires fewer BBUs than traditional network architectures, the power consumption is lower than traditional RAN architectures, so C-RAN can reduce network operating costs. However, compared with traditional cellular networks, the network state and channel state of C-RAN are more complex and variable. Traditional fixed-rate channel coding needs to acquire user channel information and uses hybrid automatic repeat request (HARQ) when decoding fails. This will increase the overhe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L27/20
CPCH04L1/005H04L1/0054H04L1/0063H04L27/20
Inventor 张昱徐佳丽彭宏卢为党徐志江
Owner ZHEJIANG UNIV OF TECH
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