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Wireless channel estimation method and evaluation device for orthogonal frequency division multiplexing communication system

A technology of orthogonal frequency division and multiplexing communication, which is applied in the field of wireless channel estimation of orthogonal frequency division multiplexing communication system, and can solve the problems of large implementation complexity, large computational complexity and inferior performance.

Inactive Publication Date: 2004-06-16
BEIJING SAMSUNG TELECOM R&D CENT +1
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Problems solved by technology

[0049] It can be seen that the computational complexity of MMSE estimation is very large
[0050] MMSE estimation can achieve better performance, but the implementation complexity is large; the traditional LS estimation is simple to implement, but the performance is not as good as the former

Method used

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  • Wireless channel estimation method and evaluation device for orthogonal frequency division multiplexing communication system
  • Wireless channel estimation method and evaluation device for orthogonal frequency division multiplexing communication system
  • Wireless channel estimation method and evaluation device for orthogonal frequency division multiplexing communication system

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Embodiment Construction

[0102] In order to achieve better performance with lower implementation complexity, the present invention proposes a new channel estimation method:

[0103] ● Discard channel impulse response with delay longer than OFDM symbol cyclic prefix time

[0104] The channel impulse response whose delay is greater than the OFDM symbol cyclic prefix time is discarded, that is, the coefficient of the channel impulse response whose delay is greater than the OFDM symbol cyclic prefix time is set to zero. This is because when designing an OFDM system, it is usually required that the OFDM cyclic prefix time is not less than the maximum delay of the channel to ensure that there will be no OFDM intersymbol interference due to channel fading, so the channel impulse with a delay greater than the OFDM symbol cyclic prefix time is discarded Response, not only will not miss important propagation paths, but also reduce the impact of noise.

[0105] ● Do two LS estimates

[0106] For each OFDM fram...

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Abstract

The invention provides an estimating method and the device for wireless channel in orthogonal frequency division multiplexing communication system. It judges if the OFDM symbol at reception end is front series or not, if it is front series, the method carries on the LS estimation based on front series; then selects key paths, (a) compares the channel impulsion response coefficient amplitude and the preset threshold, and selects an element of channel impulsion response which is not less than the threshold as the key path, the other transmission paths are abandoned, or (b) selects the element which is preset in quantity and has the maximal channel impulsion response amplitude as the key transmission path, abandons other paths; if it is not front series, it is OFDM data symbol, and carries on LS estimation based on guiding frequency in OFDM symbol to the selected transmission path. The obtained amplitude value and phase are the terminal channel estimation value.

Description

technical field [0001] The present invention relates to a wireless channel estimation method of an Orthogonal Frequency Division Multiplexing (hereinafter referred to as OFDM) communication system, in particular to a method for estimating a wireless channel of an Orthogonal Frequency Division Multiplexing communication system based on the least square criterion. Background technique [0002] OFDM is a high-speed transmission technology that can be used in next-generation wireless communication systems. Recently it has been widely concerned and researched by people. European Terrestrial Digital Video Broadcasting (hereinafter referred to as DVB-T) uses the OFDM transmission technology. Existing or future communication systems, such as Global System for Mobile Communications (hereinafter referred to as GSM), Code Division Multiple Access Communication System (hereinafter referred to as CDMA) and Universal Mobile Telecommunications System (hereinafter referred to as UMTS), may...

Claims

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Application Information

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IPC IPC(8): H04B1/00H04J11/00H04L27/10H04L27/32
Inventor 陈永春王海周判渝金香兰
Owner BEIJING SAMSUNG TELECOM R&D CENT
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