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Channel estimation method and device applied to China mobile multimedia broadcasting (CMMB) system

A channel estimation and noise estimation technology, applied in the field of channel estimation, can solve problems such as weak robustness, and achieve the effects of strong robustness, simple implementation, and improved operation speed.

Inactive Publication Date: 2014-02-19
ZTE CORP
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Problems solved by technology

[0011] The purpose of the present invention is to provide an easy-to-implement high-robust channel estimation method and device suitable for CMMB systems, which can effectively overcome the influence of channel fading and solve the problems of weak robustness in the prior art. question

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  • Channel estimation method and device applied to China mobile multimedia broadcasting (CMMB) system
  • Channel estimation method and device applied to China mobile multimedia broadcasting (CMMB) system
  • Channel estimation method and device applied to China mobile multimedia broadcasting (CMMB) system

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Embodiment Construction

[0042] The core idea of ​​the present invention is: estimate the noise threshold according to the virtual carrier, and use the noise threshold to suppress the noise of the channel estimation value.

[0043] The present invention provides a channel estimation method, which is applied to China Mobile Multimedia Broadcasting (CMMB) system, including:

[0044] Acquiring the first channel estimation value sequence corresponding to the positive frequency pilot subcarrier, the second channel estimation value sequence corresponding to the negative frequency pilot subcarrier and the noise estimation value sequence corresponding to the virtual carrier;

[0045] performing an inverse Fourier transform on the first sequence of channel estimation values ​​and the second sequence of channel estimation values ​​to obtain a first transformation sequence and a second transformation sequence;

[0046] calculating a noise threshold based on the sequence of noise estimates;

[0047] performing noi...

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Abstract

The invention provides a channel estimation method, which is applied to a China mobile multimedia broadcasting (CMMB) system. The channel estimation method comprises the following steps of: acquiring a first channel estimation value sequence corresponding to a positive frequency pilot sub-carrier, a second channel estimation value sequence corresponding to a negative frequency pilot sub-carrier and a noise estimation value sequence corresponding to a virtual carrier; performing inverse Fourier transform on the first and second channel estimation value sequences to obtain a first transformed sequence and a second transformed sequence; computing a noise threshold according to the noise estimation channel sequence; performing noise suppression on the first and second transformed sequences by using the noise threshold to obtain a first output sequence and a second output sequence respectively; and performing Fourier transform on the first and second output sequences to obtain a final channel estimation channel sequence. The invention also provides a channel estimation device.

Description

technical field [0001] The present invention relates to an Orthogonal Frequency Division Multiplex (OFDM) communication system, in particular to a channel estimation method and device in a China Mobile Multimedia Broadcasting (CMMB) system. Background technique [0002] OFDM is a high-speed transmission technology in a wireless environment. It transmits data in parallel through a set of orthogonal subcarriers, thereby greatly reducing the sensitivity to channel frequency selective fading. In order to further overcome the influence of inter-symbol interference (ISI) caused by multipath delay, a certain length of cyclic prefix (CP) is usually added before OFDM symbols in the time domain. The schematic diagram of OFDM symbols in the CMMB system can be found in figure 1 . In an OFDM communication system, a method of inserting pilot subcarriers into effective data subcarriers is generally adopted. The pilot subcarriers can be used for channel estimation at the receiving end to i...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L25/02
Inventor 张涛邱宁曹南山陈力
Owner ZTE CORP
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