Reference_Motorola_04_2006

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Sohail Esfandiyari completed an internship at Motorola's Network Business in Swindon from October 2005 to March 2006. He developed simulation tools in C++ to analyze the performance impact of two GPRS/EGPRS features: extended dynamic allocation and dual transfer mode. Sohail demonstrated a strong understanding of relevant algorithms and the ability to question assumptions. He produced comprehensive, well-structured tools that provided valuable analysis for validating the features. Sohail integrated well into the team and gained respect from his peers. The reference letter writer recommends Sohail as a strong candidate for a research position in mobile communications.

48 Bowood Road
Swindon
SN1 4LP
5th
May 2006
Personal Reference: Sohail Esfandiyari
Dear Ms McTigue
I am writing this personal reference in support of Mr Sohail Esfandiyari’s application for the post of
Research Fellow at The University of Surrey. Sohail carried out a placement in the Systems
Engineering group within Motorola’s Network Business, in Swindon, from 3 October 2005 to 31
March 2006. During his placement Sohail carried out an investigation into the performance impact
of two key GPRS/EGPRS features, namely extended dynamic allocation (EDA) – multiple uplink
timeslots allocations, and dual transfer mode (DTM) – simultaneous CS plus PS connections for a
single mobile.
Sohail’s brief was to develop standalone tools to undertake the investigations, where I was the
project supervisor. For both features Sohail took the basic idea and developed two MS Visual C++
based tools. During the development Sohail demonstrated clear understanding of the relevant
algorithms and was prepared to question the design decisions and presented refinements. Both tools
used a Monte Carlo based approach in order to achieve statistical confidence. Such an approach
allowed complex scenarios to be investigated without the need for fully dynamic system simulation.
For EDA Sohail carried out analysis to determine the scheduling probability for mobiles in EDA
mode, as well as processor impact of the Packet Control Unit (PCU) algorithms introduced to
handle EDA mobiles. The results were presented to the Development team as part of the overall
feature validation. With respect to DTM, Sohail was tasked with investigating the admission
probability using different strategies for mobiles in DTM mode. Again, the results generated were
used as part of the feature validation.
During the placement Sohail demonstrated a natural aptitude to programming in C++ and was
called upon to provide support to other team members, I’m sure that he could adapt to other
languages. In addition, he proved able to take onboard new ideas and concepts; he was also
prepared to question the basic assumptions to gain a more complete understanding. Sohail is
extremely self-motivated and worked with a high tempo throughout his time at Motorola. As a
result he produced two complex and comprehensive simulation tools that have proven to be
invaluable to Motorola, both of which were well structured and fully documented. The analysis he
provided has been critical in validating the features to which he was assigned.
I regret that Sohail’s placement with Motorola has come to an end. Particularly as he integrated
very well into the team and gained the respect of his peers. Overall, I would consider him a strong
candidate to join a research team in the field of mobile communications.

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Reference_Motorola_04_2006

1. 48 Bowood Road Swindon SN1 4LP 5th May 2006 Personal Reference: Sohail Esfandiyari Dear Ms McTigue I am writing this personal reference in support of Mr Sohail Esfandiyari’s application for the post of Research Fellow at The University of Surrey. Sohail carried out a placement in the Systems Engineering group within Motorola’s Network Business, in Swindon, from 3 October 2005 to 31 March 2006. During his placement Sohail carried out an investigation into the performance impact of two key GPRS/EGPRS features, namely extended dynamic allocation (EDA) – multiple uplink timeslots allocations, and dual transfer mode (DTM) – simultaneous CS plus PS connections for a single mobile. Sohail’s brief was to develop standalone tools to undertake the investigations, where I was the project supervisor. For both features Sohail took the basic idea and developed two MS Visual C++ based tools. During the development Sohail demonstrated clear understanding of the relevant algorithms and was prepared to question the design decisions and presented refinements. Both tools used a Monte Carlo based approach in order to achieve statistical confidence. Such an approach allowed complex scenarios to be investigated without the need for fully dynamic system simulation. For EDA Sohail carried out analysis to determine the scheduling probability for mobiles in EDA mode, as well as processor impact of the Packet Control Unit (PCU) algorithms introduced to handle EDA mobiles. The results were presented to the Development team as part of the overall feature validation. With respect to DTM, Sohail was tasked with investigating the admission probability using different strategies for mobiles in DTM mode. Again, the results generated were used as part of the feature validation. During the placement Sohail demonstrated a natural aptitude to programming in C++ and was called upon to provide support to other team members, I’m sure that he could adapt to other languages. In addition, he proved able to take onboard new ideas and concepts; he was also prepared to question the basic assumptions to gain a more complete understanding. Sohail is extremely self-motivated and worked with a high tempo throughout his time at Motorola. As a result he produced two complex and comprehensive simulation tools that have proven to be invaluable to Motorola, both of which were well structured and fully documented. The analysis he provided has been critical in validating the features to which he was assigned. I regret that Sohail’s placement with Motorola has come to an end. Particularly as he integrated very well into the team and gained the respect of his peers. Overall, I would consider him a strong candidate to join a research team in the field of mobile communications.

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Reference_Motorola_04_2006

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