Thomas L. Marzetta

Bio: Thomas L. Marzetta is an academic researcher from New York University. The author has contributed to research in topics: MIMO & Precoding. The author has an hindex of 57, co-authored 206 publications receiving 45509 citations. Previous affiliations of Thomas L. Marzetta include Mathematical Sciences Research Institute & Alcatel-Lucent.

Active user selection in massive MIMO

Abstract: A first channel correlation is calculated for each pair of access terminals in a population of access terminals. A particular pair of access terminals is identified from the population of access terminals based on the first channel correlations. The population of access terminals includes a first access terminal of the particular pair of access terminals, a second access terminal of the particular pair of access terminals, and at least one remaining access terminal from the population of access terminals. A second channel correlation is calculated between the first access terminal and each of the at least one remaining access terminal. A third channel correlation is calculated between the second access terminal and each of the at least one remaining access terminal. One of the first access terminal and the second access terminal is selected to drop from service based on the second channel correlations and the third channel correlations.

Automatic operation directional loudspeaker and operation method thereof

Abstract: PROBLEM TO BE SOLVED: To provide a directional acoustic system, a method for transmitting sound to a spatial place determined by gazing of a user, and directional communication system.SOLUTION: A directional acoustic system of an embodiment includes: a direction sensor configured to create data to determine a direction where the attention of a user is pointed to; a microphone configured to generate an output signal indicating sound received there; a loudspeaker configured to convert a directed sound signal into a directed sound; and an acoustic processor that is configured to be connected with the direction sensor, microphone, and loudspeaker and that is configured to convert an output signal into a directed sound signal and to transmit the sound directed by means of the loudspeaker to a spatial place related to that direction. The direction sensor uses a pointing device to indicate the spatial place on the basis of the movement of the pointing device by the user.

Methods and apparatuses for configuring number of antennas for massive mimo communication

Abstract: A central node of a Massive Multiple-Input-Multiple-Output (MIMO) system includes a processor and a transceiver. The processor is configured to determine a number of active antennas to be used to serve users in at least one cell of the Massive MIMO system based on wireless network parameters for the Massive MIMO system. The transceiver is configured to transmit the determined number of active antennas to a Massive MIMO base station in the at least one cell.

Antenna array free from large influence of frequency shift effect

Abstract: PROBLEM TO BE SOLVED: To obtain an antenna array used for communication of both up-link and down-link in a radio communication system like a cellular. SOLUTION: In a cellular base station including a receiver 95, a transmitter 100 m and a log period antenna array 105, an up-link (for reception) sub-array consists of antenna elements A2 to AM. The output of each of these elements is the input to the receiver 95. In this case, outputs are multiplied by weight coefficients W2 to WM on the outside of the receiver 95. A down-link (for transmission) sub-array consists of antenna elements A1 to AM-1. The transmitter 100 sends a modulated carrier signal to each element. Inputs of antenna elements A1 to AM-1 are multiplied by weight coefficients W'1 to W'M-1 on the outside of the transmitter 100. Thus, the log period antenna array 105 consisting of antenna elements A1 to AM is shared between transmission and reception.

Capacity of Multi‐antenna Gaussian Channels

Abstract: We investigate the use of multiple transmitting and/or receiving antennas for single user communications over the additive Gaussian channel with and without fading. We derive formulas for the capacities and error exponents of such channels, and describe computational procedures to evaluate such formulas. We show that the potential gains of such multi-antenna systems over single-antenna systems is rather large under independenceassumptions for the fades and noises at different receiving antennas.

Cognitive radio: brain-empowered wireless communications

Abstract: Cognitive radio is viewed as a novel approach for improving the utilization of a precious natural resource: the radio electromagnetic spectrum. The cognitive radio, built on a software-defined radio, is defined as an intelligent wireless communication system that is aware of its environment and uses the methodology of understanding-by-building to learn from the environment and adapt to statistical variations in the input stimuli, with two primary objectives in mind: /spl middot/ highly reliable communication whenever and wherever needed; /spl middot/ efficient utilization of the radio spectrum. Following the discussion of interference temperature as a new metric for the quantification and management of interference, the paper addresses three fundamental cognitive tasks. 1) Radio-scene analysis. 2) Channel-state estimation and predictive modeling. 3) Transmit-power control and dynamic spectrum management. This work also discusses the emergent behavior of cognitive radio.

What Will 5G Be

Abstract: What will 5G be? What it will not be is an incremental advance on 4G. The previous four generations of cellular technology have each been a major paradigm shift that has broken backward compatibility. Indeed, 5G will need to be a paradigm shift that includes very high carrier frequencies with massive bandwidths, extreme base station and device densities, and unprecedented numbers of antennas. However, unlike the previous four generations, it will also be highly integrative: tying any new 5G air interface and spectrum together with LTE and WiFi to provide universal high-rate coverage and a seamless user experience. To support this, the core network will also have to reach unprecedented levels of flexibility and intelligence, spectrum regulation will need to be rethought and improved, and energy and cost efficiencies will become even more critical considerations. This paper discusses all of these topics, identifying key challenges for future research and preliminary 5G standardization activities, while providing a comprehensive overview of the current literature, and in particular of the papers appearing in this special issue.

Millimeter Wave Mobile Communications for 5G Cellular: It Will Work!

Abstract: The global bandwidth shortage facing wireless carriers has motivated the exploration of the underutilized millimeter wave (mm-wave) frequency spectrum for future broadband cellular communication networks. There is, however, little knowledge about cellular mm-wave propagation in densely populated indoor and outdoor environments. Obtaining this information is vital for the design and operation of future fifth generation cellular networks that use the mm-wave spectrum. In this paper, we present the motivation for new mm-wave cellular systems, methodology, and hardware for measurements and offer a variety of measurement results that show 28 and 38 GHz frequencies can be used when employing steerable directional antennas at base stations and mobile devices.