This re-engineering and product enhancement
project was for a major US telecommunications company to update
the macro wireless base station for GSM and PCS networks. The designed
unit had to fit within the existing infrastructure and some parts
backward compatible for the macro base stations. The outline requirements
as listed below were developed into complete system and sub-system
requirements by the process of detailed design into the three key
discipline areas; the physical and mechanical, the electrical and
electronic (including firmware and RF) and the system and software.
- v 900MHz, 1800MHz and 1900MHz frequency bands.
- Indoor and outdoor variants using common assets.
- 6 RF channels, 20W per channel maximum per enclosure.
- Extendable to 12 RF channels with additional enclosure.
- E1 or T1 network operation
- Network interface and base station controller backward compatible
- Cost reduction
- EDGE functionality
- Size reduction
- RF combination within enclosure for sector configuration.
- Tough time to market program
- Optional tower mounted LNA and power amplifiers.
General highlights of the design and engineering were;
Physical and mechanical, use of Pro/E as modelling tool and build
control, Flotherm for thermal analysis of overall system and each
electrical package, convection cooling techniques, and fast assembly
time.
System and software, use of Rational Clearcase for build and modification
control, Aonix Software through Pictures and Select Yourdon for
formal design and data flow diagrams, use of LDRA Testbed for software
metrics and evaluation, and use of OSE RTOS .
Electrical and electronic, use Motorola PPC850 microcontroller,
Mentor for electrical layouts, DSPs and FPGA (utilising VHDL), JTAG
tools, specialist development and test tools, RF engineering of
transmitter and receiver chains, RF Power amplifier design, and
RF combiners and duplexers.
Flotherm is a trademark of Flomerics Ltd see www.flomerics.com
for details.
Rational Clearcase is a trademark of Rational Software Inc., see
www.rational.com
for details.
Aonix Software through Pictures is a trademark of Aonix North America
Inc., see www.aonix.com
for details.
Select Yourdon is a trademark of Select Business Solutions, a member
of Gores Technology Group, see www.selectbs.com
for details.
LDRA Testbed is a trademark of LDRA Ltd www.ldra.com
for details.
OSE RTOS is a trademark of OSE Systems Inc (an ENEA Group company),
www.ose.com for
details.
Mentor is trademark or registered trademark of Mentor Graphics Corporation
or its affiliated companies in the United States and other countries,
see www.mentor.com
for details.
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