Increasing the Uplink Throughput of Cellular Machine-to-Machine > Communications
Speaker: Dr. Howard Huang
Host Faculty: Professor Sundeep Rangan
Operators are considering the use of existing cellular network infrastructure for addressing machine-type communication for sensing and monitoring applications. The communication is characterized by fixed payloads on the order of hundreds of bits and latencies on the order of hundreds of milliseconds. The conventional strategy for uplink communication (e.g., LTE) consists of two stages: a random-access stage where devices contend for service and a second stage where transmission of the actual payload occurs over assigned resources. We propose a novel single-stage strategy where users transmit their payload over the random access channel. In contrast to conventional random access transmission where users transmit over a randomly chosen subband or spreading code, users in the proposed strategy each transmit over the full bandwidth, and a receiver jointly decoders the received signal with no advance knowledge of the active users' identities. We establish the optimality of this uncoordinated strategy and show that it can double the number users transmitting 100 bits over 1MHz bandwidth with a latency of 500ms.
About the Speaker
Howard Huang received a B.S. in electrical engineering from Rice University in 1991 and a Ph.D. in electrical engineering from Princeton University in 1995. Since then, he has been a researcher at Bell Labs (Alcatel-Lucent) in Holmdel, New Jersey, currently as a Distinguished Member of Technical Staff in the Wireless Communication Theory Department. His interests are in communication theory and the system design of wireless networks.
Dr. Huang has been an active proponent of MIMO technologies in 3GPP standards, representing Bell Labs when MIMO was first proposed in 2000 for UMTS. He worked as the rapporteur for the 3GPP MIMO work item and later made contributions on MIMO for the LTE and LTE-Advanced standards. He served as a guest editor of two issues of the IEEE Journal of Selected Areas in Communications-- one on next-generation MIMO wireless networks and another on cooperative communications in MIMO cellular networks. Dr. Huang has taught as an adjunct professor at Columbia University and is a co-author of the book MIMO Communication for Cellular Networks (published by Springer 2011). He holds over a dozen patents related to wireless communications and is a Senior Member of the IEEE.