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An estimation method for OFDM channel based on time-frequency conversion

A technology of channel estimation and time-frequency transformation, applied in the field of channel estimation based on time-frequency transformation, to achieve the effect of eliminating the problem of error flat bottom and reducing complexity

Inactive Publication Date: 2007-04-25
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0009] The technical problem to be solved by the present invention is to adopt a new channel estimation method based on time-frequency transformation to eliminate the error flat bottom problem, improve estimation accuracy, and reduce calculation complexity

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  • An estimation method for OFDM channel based on time-frequency conversion
  • An estimation method for OFDM channel based on time-frequency conversion
  • An estimation method for OFDM channel based on time-frequency conversion

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Embodiment Construction

[0016] Now in conjunction with the accompanying drawings and specific implementation methods, the technical solution for implementing the channel estimation algorithm proposed by the present invention is specifically described as follows:

[0017] Figure 1 shows the basic principle of the OFDM channel estimation method based on time-frequency transformation. The schematic diagram shows the signal sequence received by the receiver in the frequency domain, after a series of time / frequency domain transformation processing, an accurate estimation value of the frequency domain response of the channel is finally obtained.

[0018] 1. The receiver uses the training sequence to calculate the least squares LS estimate of the frequency domain response of the channel. In the OFDM system, the algorithm module is called to establish a diagonal matrix with the training sequence received by the receiver as the diagonal element, and the inverse matrix of the diagonal matrix is ​​obtained. The...

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Abstract

The invention relates to a channel evaluate method based on time-frequency conversation in orthogonal complex system (OFDM). Wherein, the invention uses the diagonal elements of channel time-domain correlative matrix to form diagonal matrix, to form a new linear change matrix, to obtain new channel evaluate method based on time-frequency conversation. The invention avoids inreducible error floor of present channel evaluate method, to obtain better effect near the minimum linear mean square deviation (LMMSE), and the FFT and IFFT can reduce the complexity of said algorism.

Description

technical field [0001] The invention relates to modulation and demodulation technology in an Orthogonal Frequency Division (OFDM) system, in particular to a channel estimation method based on time-frequency transformation. Background technique [0002] At present, with the rapid growth of the demand for communication services, higher requirements are put forward for the transmission rate of wireless communication systems and wireless local area networks, and the increase of transmission rate brings inter-symbol interference (ISI) and frequency selection to conventional single-carrier systems. The problem of sexual fading, using Orthogonal Frequency Division Multiplexing (OFDM) is one of the effective ways to solve these problems. OFDM is a multi-carrier transmission method, which disperses high-speed data to several low-rate sub-carriers for parallel transmission. [0003] For OFDM systems, under the same bit error rate requirements, the signal-to-noise ratio of differentia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 张伟陈前斌张天骐杨繁
Owner CHONGQING UNIV OF POSTS & TELECOMM
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