VSB/QAM compatible frequency balancer

A technology of balancer and channel, which is applied in the direction of transmission control/equalization, line fault/interference reduction, baseband system components, etc., and can solve problems such as system volume increase, hardware complexity, and cost increase

Inactive Publication Date: 2003-09-03
LEIJIN ELECTRONIC SHENYANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In a combined structure capable of receiving VSB-modulated signals and QAM-modulated signals, using the above-mentioned equalizer for each channel causes problems such as complicated hardware, increased system volume, and increased cost.

Method used

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  • VSB/QAM compatible frequency balancer
  • VSB/QAM compatible frequency balancer
  • VSB/QAM compatible frequency balancer

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment

[0083] In the second embodiment of the present invention, in order to reduce the power used, 2X (symbol clock) is not used in the case of fine pitch balance, and two symbol registers with different bits are used. Such an overall synchronization diagram and signal transfer is shown in Figure 9-Figure 11 .

[0084] Such as Figure 9 shown for Figure 9 2X (symbol clock) of a occurs to Figure 9 The two data of one symbol of b are recorded by two symbols different from each other, and are respectively input to the equalizer. That is, odd data contains Figure 9 The data generated by the symbol recorder of c, and the even-numbered data contains data due to Figure 9 The non-(symbol clock) recording of d, ie the data that occurs due to the inverted symbol recording is input.

[0085] However, in the present invention, a QAM channel equalizer can also be used. During the QAM channel equalizer, 4 taps form a complex number, and each 4 taps can alternately input data.

[0086]...

example 2

[0134] In order to reduce the power of the receiver, the present invention moves the 2:1 sampler located at the output end of the equalizer directly behind the signal delayer.

[0135] Figure 16 and Figure 12 The Channel Balancer is similar in its construction. The difference is that the output terminals of the signal delayers 102-1-102-4 are connected to the samplers 108-1-108-4. At this time, when the channel equalizer is used as a symbol interval equalizer, the data delayed by 1 symbol in the data delayers 102-1~102-4 is output to each coefficient calculation after being divided by the samplers 108-1~108-4 The multipliers of the sections 103-1 to 103-4.

[0136] When the channel equalizer is used as a finely spaced channel equalizer, the signal of 1 symbol is delayed in the signal delayers 102-1~102-4, and only the signal of the selected symbol position is used in the samplers 108-1~108-4 , which is output to the multipliers of each of the coefficient calculation unit...

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Abstract

This invention discloses a multi-purposes channels equalizer compatible with VSB/QAM. This equalizer first makes it clear that whether the VSB signals or the QAM signals, whether the symbol spacing or the fine spacing, the signal channel equalization of whether the real number or the complex number and like are for the received signals for channel equalization of the received signals. Then the corresponding filtering coefficient will be generated according to these factors and the transmission of the signals is controlled according to the various conditions. Therefore an equalizing function equalizes the VSB signals and the QAM signals. Thus, the area of the hardware for realizing the equalization can be reduced by a big margin.

Description

technical field [0001] The present invention relates to a channel equalizer, more specifically to a digital VSB (Vestigial Side Band) receiver and a QAM (Quadrature Amplitude Modulation) receiver and a multipurpose adaptable channel equalizer that can be shared. Background technique [0002] Generally speaking, the basic area signal is amplified and modulated with a single carrier, and an output signal with the same information on the upper and lower bands centered on the carrier on the frequency spectrum can be obtained. In this carrier channel If this output signal is transmitted directly on the computer, it is not very ideal in terms of frequency value range utilization efficiency. Therefore, only one side band modulation method is required in the upper side band wave or the lower side band wave, and the method is SSB (Single Side Band) or VSB modulation mode. These two methods are very similar. In the VSB method, in order to facilitate demodulation on the receiving side...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005H04L25/08H04L27/02
Inventor 金康镐
Owner LEIJIN ELECTRONIC SHENYANG CO LTD
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