Universal Modulator Board (OEM)

Flexible Financing Policy

ISO 9001:2008
Registered Company

Webmaster: felixs@uniquesys.com

Features

· Direct RF output from 47 MHz to 946 MHz in 1 Hz steps
· Superior Shoulders and MER
· SFN and MFN Support
· Manual Linear and Non-linear Digital Pre-correction
· Adaptive Non-linear Pre-corrector
· GbE Transport Stream Input based on Pro-MPEG Forum CoP #3
· Interfaces for Web GUI, SNMP and Telnet remote control,
machine to machine interface and software upgrades
· Available in both enclosed and board version

Waveforms Supported

· ATSC compliant with A/53, A/54, A/64 and SMPTE-310M
· ISDB-T/TB compliant with ARIB STD-B31, ARIB STD-B10,
SBTVD N01, SBTVD N03 and ABNT NBR 15601
· DVB-T/H compliant with ETSI DVB standards
· DVB-SH compliant with ETSI DVB standards
· DAB, DAB+ and T-DMB compliant with ETSI DAB standards and EU147
· CMMB compliant with GY/T 220.1-2006 and 220.2-2006
· DTMB compliant with GB20600-2006 and GY/T 229.1-2008 (SIP)

Modulator

Overview

The UBS OEM Universal Modulator Series utilizes the innovative UBS Universal Waveform engine, supporting all world standards for mobile and terrestrial digital broadcasts.
Using the latest technology, UBS has developed a direct conversion process that allows the OEM Universal Modulator to provide an RF output from 47 MHz to 946 MHz with superior shoulders and MER.
The Universal OEM Modulator can be factory configured to support one, two or all the waveforms listed above. The user can easily switch from one waveform to another through software selection. UBS’ modulators can also be upgraded in the field as standards evolve.

This open architecture design enables carriers to take advantage of a proven, robust platform, while designing networks to meet current and future broadcast standards.
This series incorporates all of UBS high performance signal processing stages including integrated linear and non-linear pre-correctors.

Full remote management and control as well as remote firmware and waveform upgrades are provided.

Modulator

Application

The core function of the Universal Modulator is to modulate an input stream in accordance with the rules for channel coding and modulation defined in the specific standards for each waveform.

Modulator

Signal Inputs

The OEM Modulators are provided with two serial DVB-ASI inputs and two serial G.703/G.704 inputs. The DVB-ASI inputs accept a MPEG-2 TS, a CMMB multiplex stream or an ISDB-T/TB multiplexed TS. The G.703/G.704 inputs are used in DAB mode and accept either NA or NI signals.

The OEM Modulators can also be equipped with a GbE Transport Stream input (based on Pro-MEG CoP #3) only when a DVB-T/H or DVB-SH waveform is selected.

The DVB-ASI and G.703/G.704 inputs can be automatically selected, or assigned by the user. The automatic switching provides near seamless switching to a secondary transport stream in case the primary transport stream source fails (a truly valuable feature for broadcast applications.)

Modulator

RF Output

The RF output covers a frequency range of 47 MHz to 946 MHz (L-Band optional) in 1 Hz steps. The output level is adjustable from -10 dBm to 0 dBm (0 dBm to 10 dBm optional), in 0.1 dB steps and the user can set the polarity of the spectrum to Inverted or Non-inverted as required.
The direct conversion process offers superior performance with Shoulder Levels = -57 dBc and MER = 50 dB.

Modulator

Adaptive Non-linear Pre-corrector

The Adaptive Non-linear Pre-corrector is a superior pre-distortion solution that compensates for RF Power Amplifier non-linearities including AM/AM and AM/PM distortion and protects against IMD and spectral regrowth while maximizing EVM performance.
The complex signal processing is done in the RF domain and supports a fully adaptive operation: the feedback signal (HPA output) is compared to the modulator’s RF output signal (HPA input) in order to optimize the correction which will improve the shoulders of the RF output.
Note: The Adaptive Non-linear Pre-corrector is a standard feature. The customer has the option to have this feature removed if desired.

Modulator

Machine to Machine Interface

Depending on the waveform selected, the Universal Modulator serial port can be used for as a machine to machine interface. This is a valuable feature when control of an external power amplifier is required.

Modulator

Web Interface

This feature allows remote control of the OEM Modulator via an Ethernet interface and is based on an internal Web server. The Web pages stored on the Web server are designed as a complete graphical user interface (GUI) for testing the status and setting the parameters of the modulator. The Web Interface concept only requires a standard computer with a network interface card (NIC) and a Web browser (Microsoft Internet Explorer, Firefrox, etc.).

Modulator

SNMP Client

This feature allows remote control of the OEM Modulator in accordance with the SNMP protocol (Get, Set and SNMP traps). This remote control feature is intended for systems solutions where it is desired to integrate the control of a range of SNMP compliant equipment in a common management system.

Modulator

Digital Linear and Non-linear Pre-corrector

The digital linear and non-linear pre-correctors are used to maximize the performance of the transmitter in which the modulator is installed.
• The Non-linear pre-corrector balances out gain and phase non-linearity in the transmitter RF power amplifier, thereby significantly reducing the in-band and out of band intermodulation products. Optimizing the transmitter’s performance will extend the coverage area. The performance requirement of the transmitter output filter, which is used to suppress radiation in adjacent channels below a maximum allowed level, will also be eased.
• The Linear pre-corrector balances out level and group delay variations that are seen across the channel bandwidth and caused by the transmitter mask filter and/or channel combiner filters. The linear optimization of the transmitter’s radiated signal allows the receiver’s channel equalizer to focus all of its correction capacity on level and group delay errors originating from the actual transmission path.