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Anti-multipath iterative weighted LMMSE channel estimation method and device

A channel estimation and iterative weighting technology, applied in channel estimation, baseband systems, digital transmission systems, etc., can solve the problems of the inability to reduce the signal error rate, the large amount of calculation, and the inability to meet the requirements, so as to improve the signal quality and achieve stable and reliable transmission. , Resist the effect of floor effect

Active Publication Date: 2017-12-15
BEIJING RINFON TECH CO LTD
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Problems solved by technology

And the error in the LS algorithm has "error floor" - SNR increases to a certain extent, BER will not continue to decline, which makes the SNR high, but as long as there is multipath, the bit error rate of the signal cannot be reduced. It cannot meet the requirements of the guideline that the bit error rate is less than <10^(-5), so its effect is worse than that of the MMSE estimation algorithm
Although MMSE has the best effect, it has a large amount of computation

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  • Anti-multipath iterative weighted LMMSE channel estimation method and device

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[0088] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be constrained by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure, and to fully convey the scope of the present disclosure to those skilled in the art.

[0089] Those skilled in the art will understand that unless otherwise stated, the singular forms "a", "an", "the" and "the" used herein may also include plural forms. It should be further understood that the word "comprising" used in the description of the present invention refers to the presence of said features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or mo...

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Abstract

The invention relates to an anti-multipath iterative weighted LMMSE channel estimation method and device. The method comprises the following steps: S110, performing time domain filtering on channel time domain impulse response output through IFFT to obtain time domain channels hP and LS; S120, computing power delay distribution according to the time domain channels hP and LS; S130, performing phase rotation, segmentation and FFT cascading on the power delay distribution to form a frequency domain; S140, forming a frequency domain autocorrelation matrix and a cross-correlation matrix according to the frequency domain, and computing a channel estimation coefficient; and S150, computing the channel estimation according to the channel estimation coefficient. The anti-multipath iterative weighted LMMSE channel estimation method and device disclosed by the invention solve an interference problem on the mobile communication signal quality by a multipath problem in the city.

Description

technical field [0001] The invention relates to the field of multi-carrier systems of OFDM systems, in particular to an anti-multipath iterative weighted LMMSE channel estimation method and device. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing) is Orthogonal Frequency Division Multiplexing technology. In fact, OFDM is MCM (Multi Carrier Modulation), a type of multi-carrier modulation. The basic principle of OFDM is to decompose a high-speed data stream into N parallel low-speed data streams, and transmit them simultaneously on N subcarriers. [0003] The biggest advantage of OFDM technology is to resist frequency selective fading or narrowband interference. OFDM technology also has the following advantages: (1) In a single-carrier system, a single fading or interference can cause the failure of the entire communication link, but in a multi-carrier system, only a small number of carriers will be interfered, and these sub-channels can also be ...

Claims

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Application Information

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IPC IPC(8): H04L25/02
CPCH04L25/0204H04L25/0242H04L25/0256
Inventor 熊军
Owner BEIJING RINFON TECH CO LTD
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