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Channel estimation method for orthogonal frequency-division multiplexing communication system

A technology for multiplexing communication and channel estimation, which is applied in the field of channel estimation in OFDM communication systems, and can solve problems such as low precision, complex algorithms, and difficulty in implementation

Inactive Publication Date: 2003-08-20
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

LS estimation is simple to implement, but the estimation accuracy is not high; MMSE estimation and other complex estimation methods can achieve higher estimation accuracy, but the algorithm is complex and difficult to implement

Method used

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  • Channel estimation method for orthogonal frequency-division multiplexing communication system
  • Channel estimation method for orthogonal frequency-division multiplexing communication system
  • Channel estimation method for orthogonal frequency-division multiplexing communication system

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Embodiment Construction

[0017] First, the transmitter generates the OFDM pilot signal used for channel estimation. The pilot insertion method adopts the comb-shaped pilot insertion method, and the pilot value selects a point on the QPSK constellation diagram as a constant pilot. The generated pilot signal is transformed into a time-domain pilot signal through an inverse Fourier transform (IFFT).

[0018] The transmitter transmits the time-domain pilot signal onto the wireless multipath fading channel.

[0019] In the receiver, the channel estimation method and implementation are as follows:

[0020] The received time-domain pilot signal becomes a frequency-domain pilot signal after undergoing Fourier transform (FFT). First, the frequency-domain pilot signal is estimated by the LS least squares method to obtain a rough estimate of the sub-channel where the pilot frequency is located, and then Use the LMMSE linear minimum mean square error estimation method to estimate the rough estimated value again ...

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Abstract

A channel calculation method for communication system of orthogonal frequency division multiplexing includes 1) creating OFDM pilot frequency signal for channel calculation by system emitter with thesignal including two parts of the pilot frequency insert mode and the pilot frequency value selection as well as to convert it to be the pilot frequency signal of time domain through inverse Fourier transformation, 2) transmitting the pilot frequency signal of time domain at radio multipath fading channel and 3) obtaining pilot frequency signal of frequency domain by changing the pilot frequency signal of time domain through Fourier transformation with system receiver and to carry on channel calculation for radio channel as obtaining calculation value of subchannel existed with the pilot frequency signal first by LMMSE calculation

Description

technical field [0001] The present invention relates to a channel estimation method in a mobile communication system, in particular to a channel estimation method in an Orthogonal Frequency Division Multiplexing communication system. Background technique [0002] At present, the development of mobile communication systems provides users with personal mobile communication terminals that can support various new services (such as multimedia communication). Because various services have a large amount of data to be transmitted, the communication system requires a higher bit transmission rate. Using higher bit rates in conventional single-carrier systems creates difficulties in efficient signal reception due to inter-symbol interference (ISI) and deep frequency-selective fading of the radio channel. [0003] One way to solve these problems is to use Orthogonal Frequency Division Multiplexing (OFDM) technology in wireless mobile environment. In an OFDM communication system, sign...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B1/707H04J11/00H04L25/02H04L27/10
Inventor 段方庆刘应状谌璟朱光喜
Owner HUAZHONG UNIV OF SCI & TECH
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