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Joint channel and data estimation method and system for fast time-varying OFDM channel

A technology of data estimation and joint channel, which is applied in the field of joint channel and data estimation method and system of fast time-varying OFDM channel, can solve problems such as channel interference, achieve fast accuracy, simple modeling, and reduce the amount of data

Active Publication Date: 2017-04-05
LEADCORE TECH +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] The present invention provides a joint channel and data estimation method and system for fast time-varying OFDM channels, which are used to solve the problem of serious inter-channel interference in the prior art

Method used

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  • Joint channel and data estimation method and system for fast time-varying OFDM channel
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  • Joint channel and data estimation method and system for fast time-varying OFDM channel

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Embodiment 1

[0022] like figure 1 As shown, the present invention provides a joint channel and data estimation method for fast time-varying OFDM channels. The estimation method is mainly performed by a wireless signal receiving device. The wireless signal receiving device is mainly installed in high-speed running devices such as high-speed rail and aircraft. The wireless signal receiving device includes, but is not limited to: a wireless gateway, a wireless relay device, and the like.

[0023] In step S1, the wireless signal receiving device presets an input-output model composed of at least one tap sequentially set based on a preset time delay. Wherein, each tap in the input-output model is provided with a corresponding channel impulse response.

[0024] For example, the wireless signal receiving device according to figure 2 The input-output model shown gives the input-output model equation as: Y s =G s x s +W s (1).

[0025] Among them, X s =[X s (0) X s (1) … X s (N-1)] T...

Embodiment 2

[0073] like image 3As shown, the present invention provides a joint channel and data estimation system for fast time-varying OFDM channels. The estimation system is installed in a wireless signal receiving device. The wireless signal receiving device is mainly installed in high-speed running devices such as high-speed rail and aircraft. The wireless signal receiving device includes, but is not limited to: a wireless gateway, a wireless relay device, and the like.

[0074] The estimation system includes: a preprocessing unit, a channel measurement equation determination unit, and an estimation unit.

[0075] The preprocessing unit is configured to preset an input-output model formed by at least one tap sequentially set based on a preset time delay. Wherein, each tap in the input-output model is provided with a corresponding channel impulse response.

[0076] For example, the preprocessing unit follows figure 2 The input-output model shown gives the input-output model equa...

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Abstract

The invention provides a joint channel and data estimation method and a system for a fast time-varying OFDM channel. According to the method, the system presets a Doppler model for a wireless channel, an input output model formed by at least one tap sequentially arranged based on preset time delay, and a channel state equation for the wireless channel built by a correlation matrix formed based on the Doppler model and all channel impact responses, wherein each tap in the input output model is provided with the corresponding channel impact response; and the state parameter in the channel state equation is formed by each channel impact response; based on the multiple data from the wireless channel and the input output model, a channel measurement equation based on the state parameter for the wireless channel is determined; and the channel measurement equation and the channel state equation are subjected to iterative filtering estimation, and data estimation corresponding to each data without interchannel interference is obtained. The interchannel interference problem in a fast time varying condition can be effectively solved.

Description

technical field [0001] The invention relates to the communication field, in particular to a joint channel and data estimation method and system of fast time-varying OFDM channels. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) technology can better solve the problem of frequency selectivity in mobile wireless channels. But in the time selection of the wireless channel, it is usually assumed that the change of the channel parameters will not be too fast, so the channel parameters are considered to be constant within one or more ODFM symbol time periods. However, in extremely high-speed motion scenarios, such as high-speed rail or aircraft communication, due to the large Doppler frequency spread caused by the high motion rate, it is likely that the channel parameters will change within one OFDM symbol time period, so that the received signal Introduce greater inter-channel interference (ICI, Inter-channel interference). [0003] In slow time-...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L27/26
Inventor 莫建林
Owner LEADCORE TECH
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