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.

Electronic device having a plurality of modes of operation

Abstract: An electronic device (1) comprising: a display (11), a first user input (13), for enabling access to a plurality of functions, a second user input (15), and a controller (3), operable, in response to an input, to change the mode of operation of the device (1) from a first, active mode of operation, in which the controller (3) is operable to enable a user access to a plurality of functions, to a second, restricted mode of operation in which the controller (3) is operable to disable user access to the plurality of functions, and operable, in response to an input via the second user input (15), to change the mode of operation of the device (1) from the second, restricted mode of operation to a third, restricted mode of operation in which the controller (3) is operable to disable user access to the plurality of functions and is operable to present information not presentable in the second restricted mode of operation.

Performance of adaptive MC-CDMA detectors in rapidly fading Rayleigh channels

Abstract: Multicarrier code-division multiple access (MC-CDMA) combines multicarrier transmission with direct sequence spread spectrum. Different approaches have been adopted which do not assume a perfectly known channel. We examine the forward-link performance of decision-directed adaptive detection schemes, with and without explicit channel estimation, for MC-CDMA systems operating in fast fading channels. We analyze theoretically the impact of channel estimation errors by first considering a simpler system employing a threshold orthogonality restoring combining (TORC) detector with a Kalman channel estimator. We show that the performance deteriorates significantly as the channel fading rate increases and that the fading rate affects the selection of system parameters. We examine the performance of more realistic schemes based on the minimum mean square error (MMSE) criterion using least mean square (LMS) and recursive least square (RLS) adaptation. We present a discussion which compares the decision-directed and pilot-aided approaches and explores the tradeoffs between channel estimation overhead and performance. We find that there is a fading rate range where each method provides a good tradeoff between performance and overhead. We conclude that the MMSE per carrier decision-directed detector with RLS estimation combines good performance in low to moderate fading rates, robustness in parameter variations, and relatively low complexity and overhead. For higher fading rates, however, only pilot-symbol-aided detectors are appropriate.

Location-based content protection

Abstract: A system and system is disclosed to protect media content via location-based data. Multimedia devices are equipped with locator devices, such as a GPS unit, or similar device. The multimedia devices preferably contain the device's International Mobile Equipment Identification (IMEI), and International Mobile Subscriber Identification (IMSI). When multimedia content is created on the multimedia device, such as image or sound files, the present invention encodes the multimedia content with location data from the locator device. Additionally, the multimedia device's IMEI and IMSI, as well as the time and the date, may be encoded onto the multimedia content. Under an alternate embodiment, a remote server performs the encoding of the multimedia content.