NJIT’s Center for Communications and Signal Processing, directed by Yeheskel Bar-Ness, distinguished professor of electrical and computer engineering, works to develop the infrastructure to enable the next generation of wireless telecommunications. Bar-Ness leads a team of researchers working to develop the infrastructure needed to support the burgeoning demand for wireless services. The group addresses issues such as privacy and security, interference and jamming, ever-heavier user traffic, and rapid transmission of data through wireless networks.
Current studies focus on the concept of cooperative communications for wireless networks, such as cellular networks, sensor networks, and wireless ad hoc networks. Different from conventional point-to-point communications, cooperative communications and networking allows different systems or nodes in a wireless network to share resources to create collaboration through distributed transmission/processing, in which the signal from each user is sent not only by the user, but also by collaborating network systems.
Among the technologies under study by Bar-Ness and his team are MIMO (multiple input/multiple output) which uses antenna arrays to increase the bit rate of wireless communications; OFDM (Orthogonal Frequency Division Multiplexing), a technology that transmits multiple signals simultaneously over a single transmission path, such as a cable or wireless system; UWB (ultra-wide band), a radio technology that can be used at very low energy levels for short-range high-bandwidth communications by using a large portion of the radio spectrum; and cognitive radio, a wireless technology in which either the network or the wireless node itself changes the parameters for transmission or reception to execute its tasks efficiently without interfering with the licensed users.
Osvaldo Simeone, assistant professor of electrical and computer engineering, is leading a team developing enabling technologies, and transmission models and protocols, and for cognitive radio. The National Science Foundation supports this work.
In this wireless technology, either network or wireless node itself changes particular transmission or reception parameters to execute its tasks efficiently without interfering with the licensed users. The team is working to address technical drawbacks in the current frameworks used in cognitive radio by introducing a novel framework of distributed spectrum leasing via cross-layer cooperation (DiSC) to guide the design of medium access control/data link (MAC/DL) - physical layer protocols in decentralized cognitive radio networks.
Simeone hopes to gain a theoretical understanding of the approach’s potential from the standpoints of network information theory and networking theory, as well as designing protocols that effectively implement DiSC in a complex wireless environment. Graduate students Tariq Elkourdi, Namjeong Lee and Keonkook Lee are members of his team.