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Self-interference-elimination method of equal-frequency simultaneous full-duplex system based on interleave and iterative decoding

A self-interference cancellation and iterative decoding technology, applied in the field of self-interference cancellation, can solve the problems of data transmission rate and spectrum utilization efficiency not reaching, receiving antenna self-interference, etc.

Inactive Publication Date: 2014-05-14
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention is to solve the problem that the data transmission rate and spectrum utilization efficiency of the existing method do not meet the highest requirements and the signal sent by the transmitting antenna of the existing method will cause a lot of self-interference to the receiving antenna on the same node, and provides Self-interference cancellation method for same-frequency simultaneous full-duplex system based on interleaving and iterative decoding

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  • Self-interference-elimination method of equal-frequency simultaneous full-duplex system based on interleave and iterative decoding
  • Self-interference-elimination method of equal-frequency simultaneous full-duplex system based on interleave and iterative decoding
  • Self-interference-elimination method of equal-frequency simultaneous full-duplex system based on interleave and iterative decoding

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specific Embodiment approach 1

[0019] Specific implementation mode one: the self-interference cancellation method of the same-frequency simultaneous full-duplex system based on interleaving and iterative decoding in this embodiment is implemented in the following steps:

[0020] Assume that the information sequences sent by the two nodes are respectively d 1 , d 2 , which is encoded into c 1 ,c 2 , and then use an independent and random interleaver π for each node 1 , π 2 will c 1 ,c 2 interweave to form x 1 ,x 2 , put x 1 ,x 2 After modulation, it is sent out through the sending end of each channel, and the receiving end of the channel performs iterative decoding chip by chip to obtain useful signals;

[0021] Wherein, the attenuation coefficient of each channel is h 1 ,h 2 , assuming that each channel is a Rayleigh fading channel, the iterative decoding part is divided into an elementary signal detector ESE and a posterior probability decoder DEC.

[0022] The effect of this implementation mo...

specific Embodiment approach 2

[0027] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the output of the basic signal detector ESE and the posterior probability decoder DEC is about x k (j) and c k (j) The extrinsic log-likelihood ratio LLR of (k=1,2), which is defined as follows:

[0028] e ESE ( x k ( j ) ) = log ( Pr ( y | x k ( j ) = + 1 ) Pr ( ...

specific Embodiment approach 3

[0040] Specific implementation mode three: the difference between this implementation mode and specific implementation mode one or two is that: the iterative decoding performed by the channel receiving end chip by chip is specifically:

[0041] Step 1: First calculate x k Mean and variance of (j)

[0042] E ( x k ( j ) ) = exp ( l ~ ESE ( x k ( j ) ) ) - 1 exp ...

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Abstract

The invention relates to a self-interference-elimination method, in particular to a self-interference-elimination method of an equal-frequency simultaneous full-duplex system based on interleave and iterative decoding. The problem that in the prior art, data transfer speed and frequency spectrum using efficiency do not meet the highest requirements, and signals sent by a sending antenna in the prior art can have great self-interference on a receiving antenna at the same node is solved. Assuming that information sequences sent by two nodes are d1 and d2 respectively, after coding, c1 and c2 are formed, then interleavers pi1 and pi2 which are independent and random are used on the nodes, c1 and c2 are subjected to interleaving to form x1 and x2, x1 and x2 are subjected to modulation and then are sent out through channel sending ends, channel receiving ends carry out iterative decoding chip by chip, and useful signals are obtained. The method is used in the field of a next-generation wireless communication system (5G).

Description

technical field [0001] The present invention relates to self-interference cancellation methods. Background technique [0002] With the full popularization of 3G in our country and the coming of 4G era, people put forward higher requirements for the transmission bandwidth of wireless cellular communication system. It is expected that in the 5G era, the peak value of broadband data services will reach 10Gbps. However, with the surge in data transmission rates, spectrum utilization has become a critical issue. For this reason, scholars have proposed a Co-frequency Co-time Full Duplex (CCFD) model. The same-frequency simultaneous full-duplex technology can effectively improve the spectrum efficiency of the communication system while ensuring the throughput of the communication system. [0003] As one of the key technologies of 5G technology, the same-frequency simultaneous full-duplex technology has attracted the attention of many researchers. The current communication syste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
Inventor 于启月朱文李亚添孟维晓
Owner HARBIN INST OF TECH
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