Compressed sensing based two-layer heterogeneous network interference channel iterative estimation method

An interference channel, compressed sensing technology, applied in baseband systems, baseband system components, digital transmission systems, etc., to achieve the effect of removing inter-cell interference

Active Publication Date: 2017-10-03
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] The purpose of the present invention is to provide a two-layer heterogeneous network interference channel iterative estimation method based on compressed sensing to effectively solve the interference channel estimation problem in non-cooperative heterogeneous networks, thereby removing inter-cell interference in the network

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  • Compressed sensing based two-layer heterogeneous network interference channel iterative estimation method
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  • Compressed sensing based two-layer heterogeneous network interference channel iterative estimation method

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[0035] The present invention will be described further in conjunction with accompanying drawing now.

[0036] Such as image 3 As shown, the home base station and the macro base station constitute a two-layer heterogeneous network, and the structure in the network is complex and the interference is serious. When the interference channel information is known, interference cancellation can be performed. The overall framework of the system provided by the present invention is as figure 1 As shown, assume that the desired link signal is The interfering link signal is The transmission signals of the two links are F is the FFT matrix,

[0037] The signal received by the receiver can be expressed as:

[0038]

[0039] n(t) is the additive white Gaussian noise in the channel, whose variance is The above formula can be expressed as:

[0040]

[0041] where H d for one (N+N g )×(N+N g )'s Toeplitz matrix, for one (N+N g)×N Toeplitz matrix. Suppose h d (t) k...

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Abstract

The invention discloses a compressed sensing based two-layer heterogeneous network interference channel iterative estimation method, and belongs to the technical field of mobile communication. The compressed sensing based two-layer heterogeneous network interference channel iterative estimation method is characterized by comprising the steps of carrying out compressed sensing sampling for a received signal and removing a cyclic prefix by utilizing sparsity of a broadband wireless channel; carrying out initial estimation for expected data by adopting MMSE, regarding a sparse binary matrix of a deterministic structure as a measurement matrix; carrying out compressed sensing channel estimation by combining pilot symbols with same amplitude and uniform phase distribution; and removing the interference portion obtained through estimation from the signal and updating the expected data for cyclic iteration. By combining a compressed sensing framework with a channel estimation technology of a two-layer heterogeneous network, the interference channel information and the expected data information can be estimated at the same time after a small number of iterations; and compared with a traditional channel estimation method, the compressed sensing based two-layer heterogeneous network interference channel iterative estimation method has obvious performance advantages in the presence of high signal-to-noise ratio.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, and in particular relates to a method for iteratively estimating interference channels in a two-layer heterogeneous network based on compressed sensing in a 5G system. Background technique [0002] The capacity of the wireless communication system has increased by more than 1 million times. According to statistics, nearly 60% of voice services and 90% of data services are carried out indoors. At the same time, the development of urbanization has made the wireless signal propagation environment more and more harsh, and the high-rise buildings have increased the penetration loss of indoor communications. It is very urgent to solve indoor coverage, improve indoor communication capacity, and provide users with high-speed and high-quality indoor services. As a new type of wireless access technology, femtocell has the advantages of low transmission power, high transmission rate, convenien...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26
CPCH04L25/0224H04L25/0242H04L25/0256H04L27/2602H04L27/2675
Inventor 刘曼宋荣方谢静
Owner NANJING UNIV OF POSTS & TELECOMM
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