Overview | Thrust
Areas |Development
Environment | Case Studies
A brief overview of Aricent's Signal Processing Group's thrust
areas is listed below:
Domains | Technology
Domains
Aricent possess expertise in the following domains:
Wireless / Satellite
Systems
Aricent has been developing firmware for a variety of cellular
and satellite-based mobile communication systems for past
several years. Leveraging its expertise and domain knowledge
in diverse wireless technologies and applications, Aricent has
carved a niche for itself by offering its skills and expertise
in the wireless domain to become a provider of a wide range
of wireless solutions. Aricent has all the requisite software
engineering expertise to build wireless components and integrate
them with DSPs, managing RF, IF, and baseband ASICs.
Aricent has expertise in developing the physical layer functionality
for 2/2.5G wireless systems, such as GSM, GPRS, and EDGE,
Hughes Network Systems (HNS) proprietary fixed wireless system
and 3G systems, such as UMTS-FDD. Expertise in 2/2.5G satellite
systems includes propriety air interface for ICO, Inmarsat,
and Thuraya. The expertise spans all aspects of project lifecycle
starting from system architecture to integrating the physical
layer with higher layers and testing with RF also. Some of
the areas Aricent can provide solutions include:
- Writing system specifications, (including system engineering).
This includes Understanding of 2/2.5/3G physical layer standards,
such as ETSI, TIA, 3GPP, and proprietary standards, and
simulations of core modules.
- Simulation/Development of physical layer components, such
as (channel coding, speech coding, modems, and equaliser.
Aricent has vast experience in developing DSP modules and libraries
in the C programming language and Matlab that serve as reference
for implementation on diverse platforms. Aricent
has developed a generic channel-coding library that can
be easily ported onto any 2.5G/3G-based mobile satellite
communications system and wireless communication system.
- Implementation and optimization of the physical layer
functionality and interfacing with peripherals for base
station and user terminal (on DSP/FPGA). This includes optimum
task partitioning among multiple DSPs or among multiple
cores of a DSP, hardware/software task partitioning between
the DSP and the FPGA and porting the L2 functionality including
RLC, UL/DL scheduler, and time alignment into DSP.
Aricent has also developed drivers for the Boot Loader, McBSP,
EHPI, and device drivers to interface with audio codecs
and other peripherals.
- Development of simulators to test the physical layer functionality
- Integrating the physical layer functionality with higher
layers. It includes Inter-Processor Communication (IPC)
mechanism and interrupt handling among others. This also
includes defining various types of messages required to/from
the physical layer for a wireless system and implementing
the same using a mailbox mechanism. A few other functionalities
in the DSP control firmware also include implementing dynamic
downloading of applications, debug and health routines,
diagnostics and statistics functionality.
- Integrating the DSP/FPGA solution with the RF
- System integration/testing that includes performance testing
in the real-time environment with other network components.
Aricent has successfully demonstrated strong project management
capabilities in executing turnkey projects in the preceding
areas. A few of the projects executed by the Aricent Signal Processing
Group in wireless/satellite-based communication system include:
- Development of a Subscriber Unit and Network Elements
for HNS fixed wireless system. The project included development
of speech codecs, modems, channel codecs, and integration
of the codecs with the control processor and the RF.
- Enhancement of the EDGE BTS. The project included development
of channel codecs, feature enhancement for better network
utilization, control code for ASICs, integrating with the
control processor and multiple ASICs, and interfacing with
the RF.
- Development of a complete low cost EDGE BTS
- Development of a Packet Control Unit(PCU). The project
included development of drivers for the Boot Loader, the
McBSP, and the EHPI, and porting the L2 functionality including
RLC, UL/DL scheduler, and time alignment into the DSP
- Development of the user terminal, network element components
and the user terminal simulator for the ICO. The project
included development of speech codecs, modems, channel codecs,
support for multiple air interfaces, and integration of
the same with the control processor and the RF.
- Development of the user terminal for the Thuraya satellite-based
wireless system. The project included development of modems,
channel codecs, and integration of the same with the control
processor and the RF.
- Development of the user terminal and network elements
for INMARSAT. The project included development of channel
codecs, measurement-related modules, modems, and integration
of the same with the control processor and the RF.
- Development of a 3G Baseband engine for the user terminal.
The project included development of the reference software
to verify the functionality of the UMTS-FDD specification,
which can be easily ported into the DSP/FPGA combination.
This includes the entire physical layer functionality including
the multi-path channel and the OCNS functionality. The baseband
engine also simulates the messages to/from L2 and L3.
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Voice over Packet /Fax over
Packet (VoP/ FoP)
Aricent is a proven provider of high performance Voice over Packet
(VoP) solutions and has commanding hold on DSP offerings.
Aricent has also developed a complete Fax over Packet (FoP) or
Fax relay solutions that enable inter-working of standard
fax machines connected to PSTN lines with packet networks,
such as IP, ATM, wireless, or proprietary protocols.
Aricent's Signal Processing Group's expertise in this area includes:
- Simulation and implementation of wireline modems for FoP
applications
- Development of efficient multimedia Codecs on DSP
- General telephony modules, such as DTMF/Tone generation/detection,
the Echo Canceller, and the Jitter Buffer
- Protocols for FoP functionality, such as T.30 and T.38
- Porting of VoP/FoP on DSP and interfacing with the control
processor. It includes dynamic downloading of the application
and the inter processor communication (IPC).
- Performance testing of end-to-end system level
Aricent has successfully demonstrated strong project management
capabilities in executing turnkey projects in the above areas.
Some of the projects executed by the Aricent Signal Processing
Group in the VoP/ FoP domain include:
- Development of the VoP/FoP-based system. The project included
development of drivers for the boot loader, the McBSP, and
the HPI and the simulation/fixed-point conversion and porting
of the core modules into the DSP and integrating with the
control processor.
- Development of an IP-based PacketPhone. The project included
development of the media manager functionality including
the features, such as speech codecs and jitter buffer, interfacing
with audio codecs, integrating with the Aricent SIP and RTP/RTCP
stacks to enable voice communication over an IP- based network
- Development of a multimedia appliance. The project included
development of the media flow functionality for the satellite-based
video terminal functionality. It involved development of
video codecs, switching/stitching functionalities, lip synchronization,
and jitter buffer, integrating with RTP and RTCP for audio
and video packetization, drivers for peripherals (HPI, USB),
and interfacing with the control processor.
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Last updated :
March 10, 2006
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