|
|
Richard Framjee
Ph.D. Student
|
M.S.:
Electrical Engineering,
The University of Texas at
Arlington, 1994.
B.S.: NWFP University of Engineering and Technology,
Peshawar, Pakistan
Currently CDMA Mobile Cellular Radio Systems, for Voice and Packet Data, based on the CDMA2000 Standard have become ubiquitous in North America. CDMA2000 uses QPSK along with Direct Sequence Spread Spectrum Modulation techniques. Current analysis of these systems is based on outage that may occur due to the users Eb/Io being less than the required Eb/Io thresholds. Error rate expressions have been derived based on the assumption that same-cell and other-cell interference have Gaussian statistics and can be added to the AWGN. Simple Channel Models are taken into account for analysis.
For completion of a Ph. D. Dissertation, it is our intent to determine the Erlang capacity of a CDMA Cellular Voice System by determining the probability of outage under wideband channel propagation conditions. Analysis will focus on several theoretical concepts that utilize analytical techniques in conjunction with Monte Carlo simulations where mathematical solutions are not practical or achievable. Several simplified concepts of IS-95 and CDMA2000 Standards will be used to model the base station transmitter (PN Sequences, Walsh Codes and filtering etc.) and the rake receiver (signal processing during SHO etc.) at the mobile,. We will consider voice transmission at 9.6kbps and inactivity periods at variable data rates of 4.8kbps, 2.4kbps and 1.2kbps. FER Performance without convolution encoding and interleaving shall be used to determine outage probability within a sectorized and omni-directional systems. At the receiver practical spreading gains for a 20 ms frame under various propagation conditions and signal processing techniques shall be calculated. An attempt shall be made to compare simplified theoretical power control models to the inner and outer loop power control algorithms that will enable more accurate determination of Eb/Io requirements. An attempt shall be made to compare at least 2 modulation techniques and use the forward and reverse link statistics to obtain the Erlang Capacity.
Student Member, IEEE.
Tau Beta Pi.
Lecturer,
NWFP University of Engineering and Technology,
Peshawar, Pakistan, 1990-1991
Nortel Networks, 1994-
Richard Framjee was born in Peshawar, Pakistan in 1967. He received the B.Sc. Degree in EE from N-W.F.P University of Engineering. & Technology, Peshawar, Pakistan in 1990 with Honors and the MS in EE from The University of Texas at Arlington, Arlington, TX, in 1994. Currently he is a Ph.D Student in EE at The University of Texas at Arlington, Arlington, TX. His interests include Analog and Digital Communications, Modulation Theory, Wireless Communications, CDMA Cellular Systems, Information Transmission & Coding, Random Signals & Noise and Fiber Optic Transmission Systems. He is a Member of Tau Beta Pi, Eta Kappa Nu, Phi Beta Delta.
He joined Nortel Networks, Richardson, TX in 1994. He was an RF Engineer and BSS Technical Consultant for 6 years and was involved in RF System Design, Verification, Bids & Proposals and Optimization of Customer GSM Networks. He conducted IS661 to GSM Interference analysis, lab and field measurements to create deployment guidelines. He also created deployment guidelines for in-building solutions.
Since July 2001 he has been the Manager/Team Leader for the CDMA System Performance Group in CDMA Product development at Nortel Networks. His Group is responsible for providing PLM/Design the Metrics/Operational Measurements to monitor RF/Network Performance and performance impacting inputs for CDMA 3G Voice and Packet Data Features. His group also analyzes customer network performance to determine solutions used towards product enhancements.