A Method of OFDM Subcarrier Channel Combination Based on Network Coding
A technology of network coding and combination method, applied in the field of wireless digital communication, can solve the problems of large difference in subcarrier transmission performance and reduced overall transmission performance, and achieve the effect of improving actual transmission performance, wide applicability, and improving system performance
Active Publication Date: 2016-10-12
江苏特建技术股份有限公司
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[0006] The purpose of the present invention is to provide a network coding-based OFDM subcarrier channel combination method to solve the problem that in the multiple access relay system using OFDM technology, the transmission performance of different subcarriers is quite different, which reduces the overall transmission performance The problem
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[0029] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0030] control figure 1 , in a wireless network including a base station BS, a relay node R, and several user nodes, the subchannel combination method for any two user nodes 1, 2 and their relay node R is specifically as follows:
[0031] Users 1 and 2 send training sequences, and the base station BS estimates that the channels from users 1 and 2 and R to BS are:
[0032] h 1,d ={H 1,d (1),H 1,d (2),...,H 1,d (N)},
[0033] h 2,d ={H 2,d (1),H 2,d (2),...,H 2,d (N)},
[0034] h r,d ={H r,d (1),H r,d (2),...,H r,d (N)},
[0035] where H 1,d (1),H 1,d (2),...,H 1,d (N);H 2,d (1),H 2,d (2),...,H 2,d (N) represent H respectively 1,d 、H 2,d The sub-channel corresponding to the channel, N represents the number of OFDM sub-channels.
[0036] The relay node R estimates the channels of users 1 and 2 to R:
[0037] h 1,r ={H ...
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The invention relates to an OFDM (Orthogonal Frequency Division Multiplexing) subcarrier channel combination method based on network coding. The network comprises a base station (BS), a relay node R and a plurality of user nodes, wherein any two user nodes and the relay node form channels: H1,d, H2,d and Hr,d, and H1,d, H2,d and Hr,d are arranged sequentially from small to large order according to module values and divided into three parts, and then corresponding channels of Hmin, Hmid and Hmax are formed, corresponding subchannels of hmin, hmid and hmax are selected to form a subchannel combination {hmin, hmid, hmax}, and the subchannels of hmin, hmid and hmax are removed from the Hmin, Hmid and Hmax channels and the H1,d, H2,d and Hr,d channels, and the user nodes and a relay R transmit signals through different channels in the subchannel combination, wherein the signal sent by the relay node R is the signal coded by network according to the received information of the user nodes 1 and 2. The method disclosed by the invention has the advantage that the optimal channel subcarrier combination can be obtained to effectively improve the system performance.
Description
technical field [0001] The invention relates to wireless digital communication technology, in particular to a method for combining OFDM sub-carrier channels based on network coding. Background technique [0002] The idea of network coding was first proposed in 2000 by Ahlswede et al. in the document "Network information flow" published on "IEEE Transaction on Information Theory". From the perspective of information theory, they strictly proved the point-to-multipoint In the communication network, the information transmission rate can reach the maximum flow of the network through the way of node coding, so the way of coding is better than the way of routing. With the deepening of the research, the recent application of the idea of network coding to the wireless communication system has gradually attracted people's attention. The use of network coding in wireless communication networks can not only improve the information transmission rate, save the energy required for tr...
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IPC IPC(8): H04L5/00H04L27/26H04L1/00
Inventor 季彦呈章国安包志华张士兵徐晨袁红林刘敏
Owner 江苏特建技术股份有限公司