Method for evaluating channel in DTMB system and device realizing same
A technology of channel estimation and channel impulse response, which is applied in the field of channel estimation and the device for realizing said channel estimation method, can solve the problems of increasing the complexity of receiving system implementation, increasing the complexity of implementing time-domain equalization, etc., and achieve the reduction of storage capacity , the effect of reducing complexity
Active Publication Date: 2012-10-03
麦克盛科技(香港)有限公司
View PDF3 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
In the case where the channel delay spread characteristics remain unchanged, the wideband digital communication system will have a strong frequency selectivity due to the narrowing of the chip time width, which means that the time domain equalization transversal filter will require a very large number of taps , and usually has at least twice the number of taps of the maximum delay spread path, which greatly increases the complexity of the system's time-domain equalization implementation
Especially in the mobile environment, due to the time-varying characteristics of the channel, the time-domain equalization system is required to have an adaptive channel tracking capability, that is, a time-varying adaptive filtering capability with a high number of taps is required; this undoubtedly greatly increases the realization of the receiving system. the complexity of
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0023] The following will take PN595 as an example to describe the present invention in detail. Of course, it is also applicable to PN420 and PN945 modes, only some parameters are adjusted accordingly. It should be particularly noted that all the constants described herein are only for the convenience of description of the embodiments, and are not intended to limit the present invention.
[0024] The frame header based on the PN595 mode does not have periodic PN sequence characteristics. In order to deal with the impact of multipath channel interference on the receiving system, the present invention uses a generalized pseudo-inverse matrix to realize channel estimation in the PN595 mode.
[0025] In a wireless communication system, the relationship between the time-domain transmitted signal s(t) and the time-domain received signal r(t) can be expressed by the following formula:
[0026] r ( t ) = h...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for evaluating a channel in a DTMB system. The method comprises the following steps: intercepting a required sequence in received PN data; reading and decoding compressed generalized pseudo-inverse matrix data; solving difference on the decoded data to acquire a generalized pseudo-inverse matrix; and carrying out matrix multiplication on the generalized pseudo-inverse matrix and the intercepted PN data sequence to acquire a channel impulse response sequence h. The invention also discloses a device for realizing the method. The method and the device can effectively reduce the complexity realized by a receiving system. The method for evaluating the channel in the DTMB system is not only applicable to the DTMB system, but can be applied to the systems having continuous random training sequences.
Description
technical field [0001] The invention relates to the field of wireless signal transmission, in particular to a channel estimation method used in a DTMB (digital terrestrial multimedia broadcasting) receiving system; the invention also relates to a device for realizing the channel estimation method. Background technique [0002] In the receiving system of digital terrestrial multimedia broadcasting, the national standard for digital TV terrestrial broadcasting independently launched by our country, two carrier transmission modes, single carrier and multi-carrier, are integrated; the PN (pseudo-random) code adopted also has 3 different types , the lengths are 420, 945, and 595 respectively, which are respectively recorded as PN420 mode, PN945 mode, and PN595 mode. For the two PN modes of PN 420 and PN 945, the PN data sequence sent by them satisfies the periodic PN correlation characteristics, which can facilitate fast channel estimation. For the PN 595 mode, the PN data seque...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L25/03
Inventor 蒋朱成吴涛王益波潘国振张卓鹏
Owner 麦克盛科技(香港)有限公司