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AVQ1040 - ActiveCore® Linear and Non-Linear Digital Adaptive Predistorter

 

Introduction

Modern communications and broadcasting services have created a demand for highly linear high power amplifiers (HPAs). The linearity of HPAs is especially crucial in bandwidth efficient modulation schemes, such as OFDM and single carrier, which provide high data rate transmission within a limited spectrum bandwidth.

Avateq's AVQ1040 ActiveCore® Linear and Non-Linear Digital Adaptive Predistorter (DAP) is characterized by its flexibility and adaptivity to all major communication and broadcasting standards, and modulation schemes (including proprietary). ActiveCore® DAP has been designed to compensate non-linear and linear distortions in digital transmitter and repeater systems found in communication and broadcasting industry.

In the context where providers are more and more concerned about reducing their network OPEX costs and, at the same time, limiting impact on the environment, Avateq's ActiveCore® DAP allows significant increase of the transmitter system efficiency, i.e. allows the transmitter to produce more output power and operate at a higher level of efficiency for a given level of distortion even using modulation schemes of a higher order significantly increasing the system throughput.

Intermodulation distortion (IMD) found in multicarrier modulation schemes is not usually considered a problem in a single carrier transmission. What does become a serious problem with digitally modulated single carriers is spectral regrowth (SR), which manifests itself in a form equivalent to IMD, thus reducing the system efficiency and throughput (useful bit rate).

Avateq's ActiveCore® DAP is capable of not only effectively compensating both IMD and SR types of non-linear distortions but also can correct linear distortions which might be a result of the signal filtering, for example, by the transmitter output filter.

By using Avateq's ActiveCore® DAP, a user can benefit from another unique functionality of the product - its ability to constantly monitor the transmitted signal quality at RF layer. This functionality can also be used by equipment manufacturers at design and manufacturing stages as a part of the transmitter test bench.

The solution effectiveness has been proven with a wide range of amplifiers built on different technologies and working in different frequency ranges: solid state, traveling wave tube and klystron power amplifiers.

For most amplifier technologies and architectures, the DAP adds the maximum benefit at the highest operating powers where inherent distortions are greatest.

Features:

  • Intelligent RFin - RFout solution;
  • Fully adaptive algorithm for non- and linear distortion estimation and compensation;
  • High performance PAR reduction engine;
  • Supports OFDM and single carrier signals;
  • Supports all major communication and broadcasting standards, as well as proprietary modulation schemes - DVB-S/DSNG/S2, ATSC, ISDB-T, DVB-T/H/T2, CMMB, DRM+, RAVIS (РАВИС), DAB, HD Radio, etc.;
  • Suitable for multi-channel transmitters;
  • Broadcasting signal RF layer analyzer at the transmitter output (standard specific);
  • Amplifier non – linearity characterization and estimation on real broadcasting signals;
  • Transmitting and amplification path responses.

Technical Specification:

Main signal input RFin:  
- signal level -50 ... 0 dBm
- frequency range 30 ... 1000 MHz*
- useful signal bandwidth 1 ... 50 MHz
- modulation OFDM/Single Carrier;
nPSK/QAM/nVSB
- modulation order not limited
   
Feedback signal input RFfbd:  
- signal level -35 ... 0 dBm
- frequency range 30 ... 1000 MHz*
- useful signal bandwidth 1 ... 50 MHz
- modulation same as RFin
- modulation order same as RFin
   
Main output RFout:  
- signal level -35 ... 0 dBm, 0.5 dB step
- frequency range 30 ... 1000 MHz*
- precorrection bandwidth <= 125 MHz
- modulation same as RFin
- modulation order same as RFin
   
Monitor output RFout mon:  
- signal level -55 ... -29 dBm, 0.5 dB step
- frequency range same as RFout
   
Frequency reference 10 MHz;
1 Vp-p, Sine (SMA)
Time reference 1PPS;
3.3V, 10 usec pulse (SMA)
MER degradation with DAP "OFF"
1 dB @ 45 dB MER at the unit input
PAR reduction up to 0 dB with ACLR/Spectrum regrowth increase
   
Non-Linear DAP:  
- gain compensation range <= 18 dB
- phase correction range ± 180 degree
   
Linear DAP:  
- group delay correction <= 2000 nsec
   
RF Layer Monitoring (optional) - Channel bandwidth;
- Spectrum measurements;
- MER/SNR;
- Constellation/Modulation;
- Signal RF layer parameters according to standard;
- Non-linear and Linear distortions
   
Interfaces:  
a) hardware: Ethernet, USB, CAN, PCIe, RS232
b) software: WEB GUI, host based GUI (PC GUI), SNMP, simplified machine-to-machine protocol
   
Power supply: 110-250V, 50/60Hz AC (1U unit)
Operating temperature range: 0..50, °C

Notes:
* Other frequency bands are available upon customer request

Applications:

  • Non- and linear adaptive pre-distorter for broadcasting industry;
  • Remote monitoring receiver in terrestrial repeater networks;
  • Modulator design and production test bench;
  • Test and monitoring receiver for transmitter development and production;
  • HPA test equipment.

Ordering Information:

  • AVQ1040 - ActiveCore® Adaptive Linear and Non-Linear Digital Predistorter (1U stand alone unit)

 

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AVQ1040 - ActiveCore® Linear and Non-Linear Digital Adaptive Predistorter

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Application Block-Diagram

Application Block-Diagram

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AVQ1040-ActiveCore® Adaptive Linear and Non-Linear Digital Predistorter (PDF)



 
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