Dr. Tripathi, a Principal Consultant at Award Solutions, joined Award Solutions in March 2004, bringing his knowledge and experience in mobile wireless technologies to facilitate the planning, development and delivery of technical training seminars. He teaches and consults on various technologies including, LTE E-UTRAN and EPC, WiMAX, UMTS R99, HSDPA, HSUPA, HSPA+, 1xEV-DO, IMS, and WiMAX. He has taught various aspects of 3G and 4G commercial cellular technologies including but not limited to network operations, network planning, and network optimization.
Since receiving his doctorate in Wireless Communications from Virginia Tech, Dr. Tripathi has held several strategic positions in the wireless arena. For Nortel Networks, he worked to analyze and optimize the performance of CDMA networks, in such areas as load balancing, handoff, power control, supplemental channel management, and switch antenna diversity. As a Senior Systems Engineer and Product Manager for Huawei Technologies, Dr. Tripathi worked on the infrastructure design and optimization of CDMA2000, 1xEV-DO, and UMTS radio networks. He has significant experience designing, analyzing, and field-testing Radio Resource Management algorithms for CDMA2000 and 1xEV-DO.
In 2001, he co-authored a book on Radio Resource Management, and he is the author of numerous research papers and patent submissions. He has contributed chapters to two books on applications of fuzzy logic to communications and applicability of network neutrality principles to wireless systems. He is a co-author of an upcoming book on cellular communications (to be published by IEEE/Wiley).
Dr. Tripathi's position at Award Solutions puts him at the forefront of emerging technologies. He has authored courseware related to LTE, WiMAX, 1xEV-DO, HSUPA, UMTS optimization, 1xEV-DO RF optimization, advanced antenna techniques, and IP convergence. In addition to teaching the students in the Industry, he also trains his colleagues (i.e., instructors) on various technologies (e.g., LTE, WiMAX, 1xEV-DO, HSDPA, HSUPA, 802.11n, and advanced antenna techniques). His extensive knowledge, hands-on experience with commercial deployments, and enthusiasm for the subject matter, coupled with a passion for teaching, provide the foundation for consistently enjoyable, informative, and effective classes.
We have seen all these terms, 4G, LTE, and WiMAX, floating around. Then, we hear that ITU has not yet “accepted” any technology as 4G.
We will try to define, as clearly as we can, the relationship between 4G and LTE. First and foremost, ITU has a submission deadline of October 2009 for a 4G technology proposal. 3GPP will submit a proposal, tentatively referred to as “LTE-Advanced”, to ITU. ITU does not use the term 4G; it refers to such technologies as “IMT-Advanced” (now, you know why the name “LTE-Advanced”!). From the performance perspective, IMT-Advanced aims for the peak data rates of 100 Mbps and 1 Gbps for high-speed mobility and fixed/low- mobility, respectively.
LTE-Advanced will meet such requirements and hopes to achieve peak spectral efficiency of 30 bps/Hz for the downlink and 15 bps/Hz for the uplink. Up to (8x8) downlink MIMO and up to (4x4) UL MIMO are being considered. The control-plane latency that will include a transition from an Idle to Active state would be less than 50 ms and the DRX (Discontinuous Reception) to Active state transition would take less than 10 ms.
To meet IMT-Advanced requirements, LTE-Advanced will support the frequency range 400 MHz to 5 GHz. Current LTE specifications defined in Release 8 support peak data rates of 300 Mbps in the downlink and 75 Mbps in the uplink for the following parameters: 20 MHz spectrum bandwidth in both downlink and uplink, the modulation scheme of 64-QAM, (4x4) MIMO in the downlink, and one antenna transmission in the uplink. Now that you know exactly what is going on regarding 4G and LTE, periodically keep checking this web-site. We will keep you updated!!