Nokia

About: Nokia is a company organization based out in Espoo, Finland. It is known for research contribution in the topics: Signal & Mobile station. The organization has 16625 authors who have published 28347 publications receiving 695725 citations. The organization is also known as: Nokia Oyj & Oy Nokia Ab.

CHoG: Compressed histogram of gradients A low bit-rate feature descriptor

Abstract: Establishing visual correspondences is an essential component of many computer vision problems, and is often done with robust, local feature-descriptors. Transmission and storage of these descriptors are of critical importance in the context of mobile distributed camera networks and large indexing problems. We propose a framework for computing low bit-rate feature descriptors with a 20× reduction in bit rate. The framework is low complexity and has significant speed-up in the matching stage. We represent gradient histograms as tree structures which can be efficiently compressed. We show how to efficiently compute distances between descriptors in their compressed representation eliminating the need for decoding. We perform a comprehensive performance comparison with SIFT, SURF, and other low bit-rate descriptors and show that our proposed CHoG descriptor outperforms existing schemes.

Weighted Sum-Rate Maximization Using Weighted MMSE for MIMO-BC Beamforming Design

Abstract: This paper studies linear transmit filter design for Weighted Sum-Rate (WSR) maximization in the Multiple Input Multiple Output Broadcast Channel (MIMO-BC). The problem of finding the optimal transmit filter is non-convex and intractable to solve using low complexity methods. Motivated by recent results highlighting the relationship between mutual information and Minimum Mean Square Error (MMSE), this paper establishes a relationship between weighted sum-rate and weighted MMSE in the MIMO-BC. The relationship is used to propose a low complexity algorithm for finding a local weighted sum-rate optimum based on alternating optimization. Numerical results studying sum-rate show that the proposed algorithm achieves high performance with few iterations.

System, apparatus, and method for effecting network connections via wireless devices using radio frequency identification

Abstract: A system, apparatus, and method for locating available information and services/applications via mobile terminals (100, 204) using radio frequency identification (RFID) technology. A transponder(s) (102, 200) is provided, having at least an application identifier (301) and associated content (302), at a location that is accessible to mobile terminal users. The transponder (102, 200) is activated via a wireless signal (702) transmitted by the mobile terminal (100, 204). The application identifier (301) and content (302) from the activated transponder (102) are received at the mobile terminal (100, 204) when it is physically located within a wireless transmission range (120) of the transponder (102). In response, an application (306- 324) identified at least in part by the application identifier (301) is invoked on the mobile terminal (100, 204). Transponders (804, 904) may also be associated with visual representations (802, 902), such that communication functions (1408, 1410) may be automatically initiated by pointing/touching an RF reader-equipped mobile device 100 to the visual representation (902) and associated tag (904).

5G 3GPP-Like Channel Models for Outdoor Urban Microcellular and Macrocellular Environments

Abstract: For the development of new 5G systems to operate in bands up to 100 GHz, there is a need for accurate radio propagation models at these bands that currently are not addressed by existing channel models developed for bands below 6 GHz. This document presents a preliminary overview of 5G channel models for bands up to 100 GHz. These have been derived based on extensive measurement and ray tracing results across a multitude of frequencies from 6 GHz to 100 GHz, and this document describes an initial 3D channel model which includes: 1) typical deployment scenarios for urban microcells (UMi) and urban macrocells (UMa), and 2) a baseline model for incorporating path loss, shadow fading, line of sight probability, penetration and blockage models for the typical scenarios. Various processing methodologies such as clustering and antenna decoupling algorithms are also presented.

Three-Dimensional Displays: A Review and Applications Analysis

Abstract: S. Benton published a definitive taxonomy of the first one hundred and seventy years of 3D displays covering the field up to the year 2000. In this article we review how display technologies have advanced in the last ten years and update Benton's taxonomy to include the latest additions. Our aim is to produce a display taxonomy suitable for content producers highlighting which displays have common requirements for image delivery. We also analyze key technical characteristics of 3D displays and use these characteristics to suggest the future applications for each category of display.