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GY/T 198-2003 English PDF

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GY/T 198-2003: Specifications and methods of measurement on QAM modulator used in digital cable broadcasting system
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GY/T 198-2003English229 Add to Cart 3 days [Need to translate] Specifications and methods of measurement on QAM modulator used in digital cable broadcasting system Valid GY/T 198-2003

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Standard similar to GY/T 198-2003

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Basic data

Standard ID GY/T 198-2003 (GY/T198-2003)
Description (Translated English) Specifications and methods of measurement on QAM modulator used in digital cable broadcasting system
Sector / Industry Radio, Film & TV Industry Standard (Recommended)
Classification of Chinese Standard M61
Classification of International Standard 33.160
Word Count Estimation 7,710
Date of Issue 2003-12-19
Date of Implementation 2004-02-01
Summary This standard specifies the compliance GY/T 170-2001 and GY/T 106-1999 cable digital television broadcasting QAM modulator technical requirements and methods of measurement. For the same measurement uncertainty can ensure that any equivalent measurement method can also be used. Dispute should be based on this standard shall prevail. This standard applies to cable digital TV broadcasting QAM modulator development, production, use, and operation and maintenance.

GY/T 198-2003: Specifications and methods of measurement on QAM modulator used in digital cable broadcasting system


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Specifications and methods of measurement on QAM modulator used in digital cable broadcasting system GY Central Republic Radio, Film and Television Cable Digital TV Broadcasting QAM Modulator Technical requirements and measurement methods Specifications and methods of measurement on QAM modulator used in digital cable broadcasting system Shi 2.2004-02-01 Real 003-12-19 China National Radio, Film and Television Administration issued standard cloth

Foreword

This standard specifies compliance with GY/T 170-2001 "Code for Cable Digital Television Broadcasting Channel Coding and Modulation" and GY/T 106-1999 " Technical Specifications and Measurement Methods for Cable Digital TV Broadcasting QAM Modulators of Technical Specifications for Cable TV Broadcasting Systems. Technical requirements of this standard Referenced the technical parameters of the cable digital TV broadcast QAM modulator at home and abroad, and fully considered the cable digital TV broadcast QAM modulator Practical application requirements in cable digital television systems. This standard is under the jurisdiction of the National Radio and Television Standardization Technical Committee. This standard was drafted. State Administration of Radio, Film and Television Radio and Television Measurement and Testing Center, Zhejiang Radio and Television Technology Co., Ltd., Shenzhen Feitong Broadband Technology Co., Ltd., Shenzhen Dirui Computer Technology Co., Ltd. The main drafters of this standard. Gong Bo, Yao Ruihong, Gao Bin, Yang Xufeng, Li Yang. Cable Digital TV Broadcasting QAM Modulator Technical requirements and measurement methods

1 Scope

This standard specifies the technical requirements and testing of QAM modulators for cable digital television broadcasting in compliance with GY/T 170-2001 and GY/T 106-1999. This standard applies to the research and development, production, use, operation and maintenance of cable digital television broadcast QAM modulators.

2 Normative references

The clauses in the following documents have become the clauses of this standard after being referenced. For dated references, all subsequent Neither amendments (excluding errata) or revised versions are applicable to this standard, however, parties who have reached an agreement under this standard are encouraged to study Is the latest version of these files available? For undated references, the latest version applies to this standard. GY/T 106-1999 Technical Specification for Cable Television Broadcasting System GY/T 170-2001 Cable Digital TV Broadcasting Channel Coding and Modulation Specification 3 Terms, definitions and abbreviations 3.1 Terms and definitions The following terms and definitions apply to this standard. Modulation error ratio The ratio of the sum of the squares of the nominal vector magnitude to the sum of the squares of the error vector magnitude, expressed in dB. 3.2 Acronyms The following abbreviations apply to this standard. ASI Asynchronous Serial Interface PCR Program Clock Reference QAM Quadrature Amplitude Modulation SPI Synchronous Parallel Interface TS Transport Stream

4 Technical requirements

The technical requirements of the cable digital TV broadcast QAM modulator are shown in Table 1. Table 1 Technical requirements of cable digital TV broadcast QAM modulator Remarks on technical indicators of project unit Input signal frame structure, channel coding Code and modulation Should comply with GY/T 170-2001 Regulations 2 Required modulation methods-64-QAM and 256-QAM 3 Output symbol rate range Mbaud 3.6 ~ 6.952 adjustable 4 Input signal interface characteristics- Should comply with GY/T 170-2001 Appendix A Provisions

5 Working frequency MHz

Should be in the range of 110MHz ~ 862MHz Conform to GY/T 106-1999 about frequency Rate division 6 Carrier frequency deviation kHz ≤ 25 For agile frequency modulators, the highest channel in the operating band should be Take measurements. 7 Tuning frequency step kHz ≤ 250 Fixed channel modulator is not specified. 8 Maximum output level dBm ≥ -8 For agile frequency modulators, the highest and most The low and middle channels are measured separately and the minimum value is taken. 9 Output impedance Ω 75 10 Output end reflection loss dB ≥ 12 The output level is -8dBm. For agile modulators, The highest channel of the operating band is measured. ≥ 32 (64-QAM) 11 Modulation error rate dB ≥ 30 (256-QAM) Output level is -8dBm, symbol rate is 6.875Mbaud, both Weighing is off. For agile frequency modulators, the The highest, lowest, and middle channels are measured separately, and the minimum value is taken. 12 Carrier-to-noise ratio dB ≥ 40 The output level is -8dBm and the symbol rate is 6.875Mbaud. Correct For agile frequency modulator, it should be at the highest and lowest working frequency band. And the middle channel are measured separately, and the minimum value is taken. 13 Parasitic output suppression ratio dB ≥ 50 The output level is -8dBm and the symbol rate is 6.875 Mbaud. For agile frequency modulators, the highest and most The low and middle channels are measured separately and the minimum value is taken. 14 Phase noise dBc/Hz ≤-65 @ 1kHz ≤-80 @ 10kHz ≤-100 @ 100kHz The output is an unmodulated carrier with an output level of -8dBm. for Agile modulator, should be performed on the highest channel of the operating frequency band measuring. 15 PCR jitter ns ± 500 The output level is -8dBm, and the modulation method is 256-QAM. The number rate is 6.875Mbaud. For agile modulators, the Measure at the highest channel of the operating frequency band. 16 stream input port-ASI. BNC type, 75Ω (required) SPI. 25 cores, negative (optional) 17 RF Output-BNC or F, 75Ω

5 Measurement method

5.1 Main measuring instruments 5.1.1 Digital TV Test Signal Generator Bit rate accuracy. 3 × 10-6; ASI signal jitter. < 0.1 UI; PCR jitter. < 50 ns. 5.1.2 Digital Vector Analyzer Bandwidth. 5MHz ~ 1000MHz. 5.1.3 Spectrum Analyzer Bandwidth. 5MHz ～ 1000MHz; Amplitude accuracy. 0.5dB; Frequency accuracy. 1Hz. 5.1.4 Frequency sweep signal generator Bandwidth. 5MHz ～ 1000MHz; Signal output amplitude. ≥-28dBm. 5.1.5 Digital TV Test Receiver Bandwidth. 5MHz ～ 1000MHz; Frequency accuracy. 2 × 10-6; PCR jitter. < 50 ns. 5.1.6 Stream Analyzer 5.2 Measurement of maximum output level 5.2.1 Measurement block diagram see picture 1. TS digital vector Analyzer Measured QAM modulator Digital TV test Signal generator Figure 1.Block diagram of maximum output level, carrier-to-noise ratio, parasitic output rejection ratio, modulation error rate, and phase noise measurement 5.2.2 Measurement procedure a) Connect the measuring instrument and the QAM modulator under test as shown in Figure 1, and set the output level of the QAM modulator under test to the maximum; b) adjust the center frequency of the digital vector analyzer to the working frequency fc of the QAM modulator under test; c) Select the in-band power measurement function of the digital vector analyzer and set the lower limit frequency of the in-band power measurement cursor to fc-4MHz. The limited frequency is fc 4MHz, which directly measures the maximum output level. 5.3 Measurement of carrier-to-noise ratio and parasitic output suppression ratio 5.3.1 Measurement block diagram see picture 1. 5.3.2 Measurement procedure a) Connect the measuring instrument and the QAM modulator under test as shown in Figure 1, and set the output level of the QAM modulator under test to -8dBm, denoted as C; b) adjust the center frequency of the digital vector analyzer to the working frequency fc of the QAM modulator under test; c) Select the in-band power measurement function of the digital vector analyzer; d) Set the lower limit frequency of the in-band power measurement cursor to fc-14MHz and the upper limit frequency to fc-6MHz, to measure the power in the noise band N1 (dBm); e) Set the lower limit frequency of the in-band power measurement cursor to fc 6MHz and the upper limit frequency to fc 14MHz. N 2 (dBm); f) Take the minimum value (dB) of the difference between C and N1 and N 2, which is the carrier-to-noise ratio; g) Measure the level of the largest parasitic product in the range of 110MHz to 1000MHz and record it as S (dBm); h) Take the difference (dB) between C and S, which is the parasitic output suppression ratio. 5.4 Measurement of modulation error rate 5.4.1 Measurement block diagram see picture 1. 5.4.2 Measurement procedure a) Connect the measuring instrument and the QAM modulator under test according to Figure 1, and set the output level of the QAM modulator under test to -8dBm; b) Adjust the center frequency of the digital vector analyzer to the working frequency of the tested QAM modulator, and use the digital vector analyzer to test the QAM. Demodulate the RF signal output by the modulator; c) Select the modulation error rate measurement function of the digital vector analyzer to measure the modulation error rate values of 64-QAM and 256-QAM, respectively. 5.5 Measurement of phase noise 5.5.1 Measurement block diagram see picture 1. 5.5.2 Measurement procedure a) Connect the measuring instrument and the QAM modulator under test according to Figure 1, and set the output level of the QAM modulator under test to -8dBm; b) Set the tested QAM modulator to the non-modulated carrier output state, and adjust the center frequency of the digital vector analyzer to the tested QAM Working frequency of the modulator; c) Select the phase noise measurement function of the digital vector analyzer to measure 1kHz, 10kHz and 100kHz from the center frequency of the carrier Phase noise value at. 5.6 Measurement of reflection loss at the output 5.6.1 Measurement block diagram See Figure 2. Sweep signal generator under test QAM modulator Spectrum Analyzer Output Figure 2 Block diagram of reflection loss measurement at output 5.6.2 Measurement procedure a) Connect the measuring instrument and the QAM modulator under test according to Figure 2, and set the output level of the QAM modulator under test to -8dBm; b) Set the frequency range of the output signal of the swept signal generator according to the working frequency band of the QAM modulator under test; c) adjust the center frequency of the spectrum analyzer to the working frequency of the QAM modulator under test; d) Disconnect the QAM modulator under test and read a level A (dBm) with the spectrum analyzer; e) Connect to the QAM modulator under test and read another level B (dBm) with the spectrum analyzer; f) Calculate L = AB, L (dB) is the reflection loss value at the output of the QAM modulator under test. 5.7 Measurement of carrier frequency deviation 5.7.1 Measurement block diagram See Figure 3. Spectrum Analyzer Under Test QAM Modulator Figure 3 Carrier frequency deviation measurement block diagram 5.7.2 Measurement procedure a) Connect the measuring instrument and the QAM modulator under test according to Figure 3; b) Set the QAM modulator under test to a non-modulated carrier output state and set the nominal operating frequency fc of the QAM modulator under test; c) Read the actual working frequency fc ′ of the QAM modulator under test with a spectrum analyzer; d) Calculate fD = fc′-fc, fD is the carrier frequency deviation value of the QAM modulator under test. 5.8 PCR Jitter Measurement 5.8.1 Measurement block diagram See Figure 4. TS t TS Code stream analyzer digital TV test signal generator tested QAM modulator Digital TV test Receiver Figure 4 Block diagram of PCR jitter measurement 5.8.2 Measurement procedure a) Connect the measuring instrument and the QAM modulator under test as shown in Figure 4, and set the output level of the QAM modulator under test to -8dBm; b) Adjust the center frequency of the digital TV test receiver to the working frequency of the QAM modulator under test. The RF signal output from the QAM modulator under test is demodulated, and the output TS stream is connected to the code stream analyzer; c) Use a stream analyzer to directly measure the PCR jitter value.

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