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Channel estimator for ground digital multimedia broadcast system based on time domain relevancy

A technology of multimedia broadcasting and channel estimator, which is applied in the field of channel estimator and equalization module, and can solve problems such as large resource consumption, long delay, and large delay

Inactive Publication Date: 2008-01-16
FUDAN UNIV +1
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Problems solved by technology

Since the data passing through the channel has been modulated by 4QAM (Quadrature Amplitude) at the transmitting end, and the correlation calculation is directly performed at the receiver end, multiple multiplication and multiple addition operations are required, while the traditional correlator consumes a lot of resources and has a long delay
Correlation through FFT-IFFT (Fast Fourier Transform and Inverse Fast Fourier Transform) in the frequency domain will also bring a large delay, and the area is larger than the traditional correlator

Method used

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  • Channel estimator for ground digital multimedia broadcast system based on time domain relevancy
  • Channel estimator for ground digital multimedia broadcast system based on time domain relevancy
  • Channel estimator for ground digital multimedia broadcast system based on time domain relevancy

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Embodiment Construction

[0037] This scheme is used in the realization of the channel estimation part of the receiver system based on the DTMB digital television transmission standard, and has achieved good results.

[0038] The specific steps of the time-domain channel estimation implementation method are introduced below:

[0039] See Figure 5 for details. Taking the calculation of the channel impulse response with one frame of data as an example, the operation process of the data flow is described:

[0040] (1) Locate the starting point of the PN sequence used for channel estimation according to the starting position of the PN sequence passed to the channel estimation module by the synchronization module, i.e. the start signal, to determine the beginning of a frame of data, and simultaneously transmit it according to the upper module of channel estimation The effective PN signal determines the starting position of the effective PN, as shown in Figure 1, the starting position of PN_255_2. 255 symbo...

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Abstract

The invention belongs to the field of wireless digital communication technology, specifically relating to a ground digital television media broadcasting (DTMB) system channel estimator based on time domain correlation. The method of circular correlation is applied, and by using the quasi-cyclic PN (pseudo random) protection serial in the DTMB system frame structure, a channel impulse responses is obtained. Based on the CMOS technique in the standard of SMIC 0.18 micron, the channel estimator provided in the invention can work stably under the frequency of 60MHz, and the area is no more than 152k equivalent gates. Compared with the channel estimator based on fast fourier transform (FFT), the implementation scheme of channel estimation proposed in the invention reduces the design complexity by 50% on the premise of ensuring no performance loss, and the operation period reduces greatly.

Description

technical field [0001] The invention belongs to the technical field of wireless digital communication, and in particular relates to a channel estimator and an equalization module applicable to a digital TV or digital broadcast receiving system. Background technique [0002] In recent years, wireless communication has received extensive attention. There are various multipath and fading phenomena in the terrestrial wireless broadcast transmission channel (mainly high frequency band and ultra high frequency band), resulting in static or dynamic multipath interference and Doppler effect, which is a complex frequency selective fading channel . Because the wireless communication transmission environment is relatively harsh, the requirements for digital receivers are relatively high. In OFDM (Orthogonal Frequency Division Multiplexing) systems with high data rates, coherent demodulation technology is generally used, and channel information is required for coherent demodulation. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04N5/44
Inventor 曾晓洋陈赟陈媛陈俊周本根
Owner FUDAN UNIV
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