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A channel estimation and data detection method for ofdm system

A channel estimation and data detection technology, applied in multi-frequency code systems, baseband system components, wireless communications, etc., can solve problems such as limited practical applications, high complexity, and reduced spectrum utilization

Inactive Publication Date: 2011-12-21
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some of them are aimed at special or limited channels. For example, when the normalized Doppler frequency offset is less than 0.1, the channel tap is considered to change linearly, and channel estimation is performed on this condition. However, due to the existence of preconditions, the practical application is limited.
Some studies eliminate ICI and achieve channel estimation by using the minimum mean square error criterion (MMSE, Minimum Mean Squared Error) to filter the received signal in the time-frequency domain, but the complexity is high and channel statistics are required
There are also some algorithms for channel estimation by increasing the number of pilot points, but the stronger the time variation, the greater the number of pilot points required, which greatly reduces the spectrum utilization

Method used

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  • A channel estimation and data detection method for ofdm system

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Embodiment 1

[0103] The OFDM signal with a system bandwidth of 10 MHz and a time slot length of 0.5 ms is used as a broadband wireless signal. There is no direct path in the channel. The specific parameter settings are shown in Table 1; the subcarrier settings in the OFDM signal are as follows figure 2 As shown, the number of data subcarriers in the data part is set to 600; the schematic diagram of the receiving and transmitting system is shown in image 3 ;Set the number of iterations in the algorithm to 100; when 2.2626 And 2.2626 when using the channel; the channel has 3 propagation paths , the average gain of each path is 25dB, 5dB, and 10dB, and the time delay of each path is: 1ts, 3ts, and 7ts.

[0104] When the terminal speed is 120km / h, the bit error rate when the signal-to-noise ratio is 25dB: 0.0021;

[0105] When the terminal speed is 200km / h, the bit error rate when the signal-to-noise ratio is 25dB: 0.0026;

[0106] When the terminal speed is 360km / h, the bit error rate wh...

Embodiment 2

[0110] The OFDM signal with a system bandwidth of 10MHz and a time slot length of 0.5ms is used as a broadband wireless signal, and the channel has a direct path. The specific parameter settings are shown in Table 2; the subcarrier settings in the OFDM signal are as follows figure 2 As shown, the number of data subcarriers in the data part is set to 600; the schematic diagram of the receiving and transmitting system is shown in image 3 shown; the algorithm sets the number of iterations to 100; 2.26 26 and 2.2626 when using the channel; when the channel has 3 Propagation path, the average gain of each path is 25, 5 and 10dB, the time delay is: ts, 3ts and 4ts, and the fading parameter is 20.

[0111] The bit error rate when the terminal speed is 120km / h and the signal-to-noise ratio is 25dB: 0.0024;

[0112] When the terminal speed is 200km / h and the signal-to-noise ratio is 25dB, the bit error rate is 0.0037; when the terminal speed is 360km / h, the bit error rate is 0.0048...

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Abstract

The invention relates to a channel estimation and data detection method for an OFDM (Orthogonal Frequency Division Multiplexing) system, in particular to a time delay domain base resolution based channel estimation and data detection method of the OFDM system in a high-speed moving scene, belonging to the field of wireless communication. The channel estimation and data detection method comprises the following steps of: resolving a channel frequency domain response matrix into two parts, i.e. a surface feature time delay domain and a surface feature ICI (Inter-Carrier Interference); and realizing the channel estimation of the OFDM system in the high-speed moving scene by simplifying the two parts. According to the channel estimation and data detection method disclosed by the invention, the ICI problem caused due to orthogonality misadjustment between subcarriers of the OFDM system under a time-varying channel can be effectively solved, and therefore influences caused by parameter time variant is overcome in a certain sense; bit error rate can be greatly reduced, the high-speed moving scene can be very well coped, and properties can not be reduced progressively with the increase of mobile carriers and base stations relative to mobile speed.

Description

technical field [0001] The invention relates to a channel estimation and data detection method for an OFDM system, in particular to a channel estimation and data detection method for an OFDM system based on time-delay domain basis decomposition in a high-speed mobile scene, and belongs to the field of wireless communication. technical background [0002] Orthogonal Frequency Division Multiplexing (OFDM: Orthogonal Frequency Division Multiplexing) technology has the advantages of high data transmission rate, strong anti-multipath interference ability, high spectrum efficiency, easy realization of multiple access and flexible resource allocation, etc. be valued. At present, it has been successfully used in wired and wireless communications, and has been applied to a new generation of mobile communication systems. Of course, there are still many practical technical problems in the implementation of OFDM technology in mobile communication systems, and the subcarrier orthogonali...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L25/02H04W28/04
Inventor 薛艳明高飞冀鹏飞安建平卜祥元李祥明
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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