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.

System and method for multimodal short-cuts to digital services

Abstract: A method and system for facilitating user access to services through a wireless device of a user, involves recommending to a user a subset of services from a plurality of services available to the user in which each recommended service of the subset has at least one voice short-cut associated therewith, and selecting a service to be accessed through the user's wireless device from the subset of services according to a voice command by the user corresponding to the voice short-cut of the service.

A QRD-M/Kalman filter-based detection and channel estimation algorithm for MIMO-OFDM systems

Abstract: The use of multiple transmit/receive antennas forming a multiple-input multiple-output (MIMO) system can significantly enhance channel capacity. This paper considers a V-BLAST-type combination of orthogonal frequency-division multiplexing (OFDM) with MIMO (MIMO-OFDM) for enhanced spectral efficiency and multiuser downlink throughput. A new joint data detection and channel estimation algorithm for MIMO-OFDM is proposed which combines the QRD-M algorithm and Kalman filter. The individual channels between antenna elements are tracked using a Kalman filter, and the QRD-M algorithm uses a limited tree search to approximate the maximum-likelihood detector. A closed-form symbol-error rate, conditioned on a static channel realization, is presented for the M=1 case with QPSK modulation. An adaptive complexity QRD-M algorithm (AC-QRD-M) is also considered which assigns different values of M to each subcarrier according to its estimated received power. A rule for choosing M using subcarrier powers is obtained using a kernel density estimate combined with the Lloyd-Max algorithm.

Supporting differentiated classes of service in Ethernet passive optical networks

Abstract: Ethernet passive optical networks (EPONs) are being designed to deliver multiple services and applications, such as voice communications, standard and high-definition video (STV and HDTV), video conferencing (interactive video), real-time and near-real-time transactions, and data traffic. To support these applications with their diverse requirements, EPONs need to have class-of-service (CoS) mechanisms built in. Here we investigate how the Multipoint Control Protocol (MPCP)—an EPON transmission arbitration mechanism—can be combined with a strict (exhaustive) priority scheduling that is a default scheduling algorithm specified in the Institute of Electrical and Electronics Engineers (IEEE) 802.1D standard. Specifically, packet delays for different classes of traffic are analyzed. We find that the queuing delay for lower-priority classes increases when the network load decreases (a phenomenon we call light-load penalty). We also suggest and analyze two different optimization schemes that eliminate the light-load penalty.

System and method for the transfer of digital data to a mobile device

Abstract: A mobile device is capable of accessing electronic shop server web sites which contain digital products for sale and hotspot network locations where these digital products may be downloaded to the mobile device without incurring cellular phone charges or public switched telephone network charges. The mobile device has a short range transceiver for low power radio frequency over the short distance and a network transceiver for cellular telephone signals. The hotspot network locations contain a hotspot device for transmitting the digital products to the mobile devices via the low power radio frequency signal. The mobile device has the capability of detecting the presence of the low power radio frequency signal when it is in range of the signal. Using this system, method and computer program a user of a mobile device may download large amounts digital data without incurring telephone or cellular phone charges.

On IP-over-WDM integration

Abstract: Expanding Internet-based services are driving the need for evermore bandwidth in the network backbone These needs will grow further as new real-time multimedia applications become more feasible and pervasive Currently, there is no other technology on the horizon that can effectively meet such a demand for bandwidth in the transport infrastructure other than WDM technology This technology enables incremental and quick provisioning up to and beyond two orders of magnitude of today's fiber bandwidth levels This precludes the need to deploy additional cabling and having to contend with right-of-way issues, a key advantage Hence, it is only natural that over time optical/WDM technology will migrate closer to the end users, from core to regional, metropolitan, and ultimately access networks At present, WDM deployment is mostly point-to-point and uses SONET/SDH as the standard layer for interfacing to the higher layers of the protocol stack However, large-scale efforts are underway to develop standards and products that will eliminate one or more of these intermediate layers (eg, SONET/SDH, ATM) and run IP directly over the WDM layer IP over WDM has been envisioned as the winning combination due to the ability of the IP to be the common revenue-generating convergence sublayer and WDM as a bandwidth-rich transport sublayer Various important concerns still need to be addressed regarding IP-WDM integration These include lightpath routing coupled with tighter interworkings with IP routing and resource management protocols, survivability provisioning, framing/monitoring solutions, and others