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A Low Complexity and Efficient Channel Estimation Algorithm

A channel estimation and low-complexity technology, applied in the field of wireless communication OFDM, can solve problems such as estimation performance impact, and achieve the effect of reducing estimation accuracy

Active Publication Date: 2015-09-09
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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Problems solved by technology

[0009] According to the improvement of MMSE estimation by Edfors et al. in the article "OFDM Channel Estimation by Singual Value Decomposition" using the SVD method, the SVD algorithm does greatly reduce the computational complexity. Coming soon (XX H ) -1 Using its expected value E(XX H ) -1 To replace and replace those smaller singular values ​​with 0, this processing will inevitably affect the performance of the estimate

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  • A Low Complexity and Efficient Channel Estimation Algorithm
  • A Low Complexity and Efficient Channel Estimation Algorithm
  • A Low Complexity and Efficient Channel Estimation Algorithm

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Embodiment Construction

[0022] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0023] The general MMSE algorithm channel estimation expression is:

[0024] H ^ MMSE = R H ( R H + σ n 2 ( ...

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Abstract

The invention relates to a low-complexity efficient channel estimation algorithm comprising the following steps of: (1) executing diagonalization of matrix on a signal X at a channel estimation part, solving a Hermitian matrix P and a diagonal matrix Lambda X according to the formula of X=P Lambda XP<-1>; (2) executing channel estimation by an MMSE (Minimum Mean Square Error) algorithm to get a channel estimation matrix which is described in the specification, wherein the noise variance is described in the specification, the LS (Least Squares) channel estimation is described in the specification, RH=E(HHH) is a channel correlative matrix, and H is a channel frequency domain response; and (3) executing channel estimation based on the channel estimation matrix. In the algorithm, the amount of calculation of the algorithm is further reduced without reduction of the performance of the original MMSE algorithm.

Description

technical field [0001] The invention relates to the field of wireless communication OFDM technology, in particular to a low-complexity and high-efficiency channel estimation algorithm. Background technique [0002] With the rapid development of mobile communication technology, OFDM, as a kind of multi-carrier modulation technology, has many advantages such as strong anti-narrowband interference, strong frequency selective fading ability and high frequency band utilization because it satisfies the mutual orthogonality of each subcarrier. Therefore, it has been paid more and more attention by scholars and has become a hot spot of people's research. It is widely used in many fields such as military affairs and communication, and is considered to be one of the very important key technologies in the fourth generation mobile communication. [0003] When OFDM technology is applied to wireless communication, channel estimation is a key link. The system can use differential modulati...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 马天鸣周磊磊施玉松高丹王营冠张唯易
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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