Downlink rateless code degree distribution and pre-coding combined optimization method for cloud access network

Abstract

The invention discloses a downlink rateless code degree distribution and pre-coding combined optimization method for a cloud access network. For a downlink multi-user access scene of the cloud accessnetwork, we propose a pre-coding matrix and rateless code output degree distribution combined optimized method under the limit of the single-antenna peak power at an RRU (Remote Radio Unit) with the help of zero-forcing pre-coding idea in a baseband processing unit pool. Through the combined optimization of the rateless code degree distribution and pre-coding in a downlink multi-user scene of thecloud access network, the method can improve the total throughput capacity of a system.

Description

technical field

[0001] The invention relates to the field of wireless communication, in particular to a cloud access network downlink rateless code degree distribution and a precoding joint optimization method. Background technique

[0002] Cellular networks are becoming smaller and consist of multiple layers of heterogeneous networks to serve more users, thus inter-cell interference and cell association issues are becoming more complex and challenging. At the same time, the next-generation mobile communication network will face a large number of users and a large amount of data transmission. This brings an urgent requirement to increase the capacity of the Radio Access Network (RAN).

[0003] Cloud Access Network (C-RAN) is a new type of access network architecture, which is characterized by completely separating the remote radio unit (RRH) and baseband processing unit (BBU) of each access node in the network, and the RRH It is closer to the user, and each BBU is concentr...

Examples

Embodiment

[0097] Example: refer to figure 1 , the cloud access network downlink system consists of users, baseband processing unit (BBU) pools, and remote radio units (RRH). There is a wireless link between the user and the RRH node, and a high-speed link between the RRH node and the BBU pool. The specific implementation method of the transmission mechanism is as follows:

[0098] 1.1) All users in the network need to encode the original information m=[m 1 ,m 2 ,...,m K ] T After encoding by LDPC encoder and LT encoder in turn, the degree distribution of LT encoding is w(x)=∑ d w d x d-1 , where w d Indicates the probability of an edge connected to an output node with degree d. Encoding generates code word c=[c 1 ,c 2 ,...,c K ] T .

[0099] 1.2) to the generated code word c=[c 1 ,c 2 ,...,c K ] T Perform modulation, that is, respectively map bits 0 and 1 according to the actual modulation method to obtain the modulation symbol s=[s 1 ,s 2 ,...,s K ] T .

[0100] 1...

technical field

[0001] The invention relates to the field of wireless communication, in particular to a cloud access network downlink rateless code degree distribution and a precoding joint optimization method. Background technique

[0002] Cellular networks are becoming smaller and consist of multiple layers of heterogeneous networks to serve more users, thus inter-cell interference and cell association issues are becoming more complex and challenging. At the same time, the next-generation mobile communication network will face a large number of users and a large amount of data transmission. This brings an urgent requirement to increase the capacity of the Radio Access Network (RAN).

[0003] Cloud Access Network (C-RAN) is a new type of access network architecture, which is characterized by completely separating the remote radio unit (RRH) and baseband processing unit (BBU) of each access node in the network, and the RRH It is closer to the user, and each BBU is concentr...

Examples

Embodiment

[0097] Example: refer to figure 1 , the cloud access network downlink system consists of users, baseband processing unit (BBU) pools, and remote radio units (RRH). There is a wireless link between the user and the RRH node, and a high-speed link between the RRH node and the BBU pool. The specific implementation method of the transmission mechanism is as follows:

[0098] 1.1) All users in the network need to encode the original information m=[m 1 ,m 2 ,...,m K ] T After encoding by LDPC encoder and LT encoder in turn, the degree distribution of LT encoding is w(x)=∑ d w d x d-1 , where w d Indicates the probability of an edge connected to an output node with degree d. Encoding generates code word c=[c 1 ,c 2 ,...,c K ] T .

[0099] 1.2) to the generated code word c=[c 1 ,c 2 ,...,c K ] T Perform modulation, that is, respectively map bits 0 and 1 according to the actual modulation method to obtain the modulation symbol s=[s 1 ,s 2 ,...,s K ] T .

[0100] 1...

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