Zeros of orthogonal polynomials

Wireless sensor networks (WSNs) enable new applications and require non-conventional paradigms for protocol design due to several constraints. Owing to the requirement for low device complexity together with low energy consumption (i.e., long network lifetime), a proper balance between communication and signal/data processing capabilities must be found. This motivates a huge effort in research activities, standardization process, and industrial investments on this field since the last decade. This survey paper aims at reporting an overview of WSNs technologies, main applications and standards, features in WSNs design, and evolutions. In particular, some peculiar applications, such as those based on environmental monitoring, are discussed and design strategies highlighted; a case study based on a real implementation is also reported. Trends and possible evolutions are traced. Emphasis is given to the IEEE 802.15.4 technology, which enables many applications of WSNs. Some example of performance characteristics of 802.15.4-based networks are shown and discussed as a function of the size of the WSN and the data type to be exchanged among nodes.

https://www.mdpi.com/1424-8220/9/9/6869/pdf

An Overview on Wireless Sensor Networks Technology and Evolution

Digital coding of waveforms: Principles and applications to speech and video

Aspects of the subject disclosure may include, for example, receiving, by a feed point of a dielectric antenna, electromagnetic waves from a dielectric core coupled to the feed point without an electrical return path, where at least a portion of the dielectric antenna comprises a conductive surface, directing, by the feed point, the electromagnetic waves to a proximal portion of the dielectric antenna, and radiating, via an aperture of the dielectric antenna, a wireless signal responsive to the electromagnetic waves being received at the aperture. Other embodiments are disclosed.

Method and apparatus for coupling an antenna to a device

A distributed antenna and backhaul system provide network connectivity for a small cell deployment. Rather than building new structures, and installing additional fiber and cable, embodiments described herein disclose using high-bandwidth, millimeter-wave communications and existing power line infrastructure. Above ground backhaul connections via power lines and line-of-sight millimeter-wave band signals as well as underground backhaul connections via buried electrical conduits can provide connectivity to the distributed base stations. An overhead millimeter-wave system can also be used to provide backhaul connectivity. Modules can be placed onto existing infrastructure, such as streetlights and utility poles, and the modules can contain base stations and antennas to transmit the millimeter-waves to and from other modules.

Backhaul link for distributed antenna system

A user equipment (UE) (200, 500, 1530) transmits data to a base station (100, 500, 1520) in a wireless communication network. The UE (200, 500, 1530) comprises multiple an- tenna ports, and selects a precoding matrix from a respective first, second, third, or fourth set of precoding matrices according to a number of spatial layers. The first, second, third, and fourth sets of precoding matrices are available for all coherence capabilities and are comprised within a larger set of precoding matrices. The larger set comprises precoding matrices that are not available for all coherence capabilities. The first, second, third, and fourth sets of precoding ma- trices correspond to one, two, three, or four spatial layers, respectively. The number of columns in the selected precoding matrix is equal to the number of spatial layers and each column com- prises a single non-zero element and one or more zero elements. The UE (200, 500, 1530) transmits data on the number of spatial layers according to the selected precoding matrix.

Variable coherence adaptive antenna array

The problem of designing simple and energy-efficient nonlinear distributed source-channel codes is considered. By demonstrating similarities between this problem and the problem of bandwidth expansion, a structure for source-channel codes is presented and analyzed. Based on this analysis an understanding about desirable properties for such a system is gained and used to produce an explicit source-channel code which is then analyzed and simulated. It is shown that the code has a substantial gain compared to a linear source-channel code.

Nonlinear distributed source-channel coding over orthogonal additive white Gaussian noise channels

According to one aspect of this disclosure, the configuration of which Interference Measurement Resources, "IMRs", a given user equipment, "UE", should measure for Channel State Information, "CSI", reporting is made more or less invariant to dynamic traffic variations affecting the set of Coordinated Multi-Point, "CoMP", transmission points used for serving the UE, or to the use of dynamic blanking for those transmission points. These goals are achieved at least in part by configuring one or more of the transmission points to follow a first rule embodying a negative logic. According to the first rule, the transmission point transmits on a given IMR if it has been deemed as being not likely to transmit data at a time relevant to the IMR, and, conversely, to not transmit the IMR if it has been deemed as being likely to transmit data at a time relevant to the IMR.

Load-invariant configuration of interference measurement resources in coordinated multi-point

In many communication applications one is inter- ested in transmitting a time-discrete analog-valued (i.e. con- tinuous alphabet) source over a time-discrete analog channel. We study this problem in the case of bandwidth expansion, in the sense that one source sample, �� , is transmitted over �� orthogonal channels. An analog source-channel code based on orthogonal polynomials is proposed and analyzed. The code can be generated using a Gram-Schmidt procedure, to fit virtually any source distribution.

http://ieeexplore.ieee.org/iel5/26/5281729/05281750.pdf

Transactions Papers Polynomial Based Analog Source-Channel Codes

FIELD: wireless communication equipment.SUBSTANCE: invention relates to wireless communication and can be used to determine power to be used for a set of antenna ports for transmission over a physical uplink shared channel. User equipment (UE) comprises a processing circuit configured to obtain power P to be used to control power in an uplink for transmission over a physical uplink shared channel, and determining power to be used for a set of antenna ports, based on power P according to rule, which depends on whether the UE is using the codebook based transmission or the non-codebook transmission for transmission over the physical uplink shared channel. Set of antenna ports represents antenna ports, through which transfer is transmitted via a physical shared uplink channel with non-zero power.EFFECT: higher efficiency of adaptation.20 cl, 16 dwg, 1 tbl

Niklas Wernersson

Papers

Variable coherence adaptive antenna array

Nonlinear distributed source-channel coding over orthogonal additive white Gaussian noise channels

Load-invariant configuration of interference measurement resources in coordinated multi-point

Transactions Papers Polynomial Based Analog Source-Channel Codes

Transmission power control for a single-user system with multiple inputs and multiple uplink outputs of a new radio