Physical-layer network coding synchronization method
A technology of network coding and physical layer, which is applied in the field of synchronization of physical layer network coding, can solve problems such as the inability to know the asynchronous amount of symbols, and achieve the effects of solving PNC asynchronous problems, reliable communication, and accurate signals
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specific Embodiment approach 1
[0018] In the physical layer network coding synchronization method of this embodiment, the physical layer network coding is the process of performing mapping processing at the relay node as shown in Table 1, combined with figure 1 The system model of the three-node PNC is shown and Figure 5 Shown flow chart, described method is realized through the following steps:
[0019] Step 1. Set nodes A, B and relay node R, and the channel between nodes A, B and relay node R is a Gaussian channel, with a structure such as figure 1 The PNC model shown; then build a complete complementary code that can synchronize the PNC; wherein, PNC represents a three-node physical layer network coding system, which is a physical layer technology applied to a two-way relay system;
[0020] Step 2, in front of the data frame of PNC, increase the complete complementary code that step 1 builds as the synchronous code header, then, the original data S that node A, B will send A and S B After modulation...
specific Embodiment approach 2
[0023] Different from the specific embodiment one, in the physical layer network coding synchronization method of this embodiment, the process of constructing the complete complementary code of the PNC described in the first step is as follows:
[0024] Step one one, construct synchronous code word and be complementary code pair: sequence a and sequence b;
[0025] Among them, sequence a=[a(0),a(1),...a(N-1)], sequence b=[b(0),b(1),...b(N-1)], N means code length;
[0026] For any n, n=0,1,...N-1,|a n |=1, |b n |=1, and the autocorrelation function R of sequence a and sequence b a,a (n) and autocorrelation function R b,b (n) meet R a , a ( n ) + R b , b ( n ) = ...
specific Embodiment approach 3
[0035] The difference from the specific embodiment 1 or 2 is that, in the physical layer network coding synchronization method of this embodiment, in step 3, the synchronization code header in the data frame of the PNC is used to estimate x A and x B The process of symbol asynchronous quantity Δ arriving at relay node R is,
[0036] Step 31. Add a section of cyclic prefix CyclicPrefix and cyclic suffix CyclicPostfix before and after each subcode to protect the orthogonality between subcodes, and obtain the following: figure 2 The frame structure shown, subcode A 1 The complementary code of the latter length is copied and moved to A 1 The front of the code is used as a cyclic prefix, and the complementary code of the previous length is copied and moved to A 1 The length of the cyclic prefix and the cyclic suffix are both greater than the signal x A and x B The maximum possible delay τ MAX ;
[0037] Step 32: Parallel sliding correlation synchronization system, estimatin...
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