Abstract: An efficient method for providing both dedicated and simulcast services over a common wireless infrastructure is described. The services can be available to a single terminal as well as to a multiplicity of terminals simultaneously. The method uses time division multiplexing and orthogonal frequency division multiple access for simulcasting information and transmitting dedicated message information from a plurality of base stations forming a cellular pattern over the same wireless frequency channel. The method comprises the steps of constructing frames for transmission by the plurality of base stations comprising control information, simulcast information and dedicated message information within predetermined time slots of the frames and allocating the simulcast information and the dedicated message information to time slots of the same frame predetermined by the control information of the frame. The underlying modulation technology used is OFDM and thereby the channel delay-dispersion is minimized.

Abstract: A rate-adaptive method of communicating over a multipath wireless communication system uses multiple links such that each end of a link uses multiple transmit and receive antennas. A number of independent streams that are to be transmitted for each link is determined based on an overall system performance measure. In addition, the system may also jointly determine the best modulation, coding, power control, and frequency assignment for each link, based on an overall system performance measure. In OFDM systems, the number of independent streams, as well as the modulation, coding, and power control, may be determined on a tone-by-tone basis based on an overall system performance measure.

Abstract: A rate-adaptive method of communicating over a multipath wireless communication system uses multiple links such that each end of a link uses multiple transmit and receive antennas. A number of independent streams that are to be transmitted for each link is determined based on an overall system performance measure. In addition, the system may also jointly determine the best modulation, coding, power control, and frequency assignment for each link, based on an overall system performance measure. In OFDM systems, the number of independent streams, as well as the modulation, coding, and power control, may be determined on a tone-by-tone basis based on an overall system performance measure.

Abstract: This document describes techniques for progressively indicating new content in an application-selectable user interface. These techniques permit a user to view indications of new content for applications progressively, rather than all at one time. By so doing, the techniques may avoid mentally or visually overloading or over-stimulating a user viewing the indications.

Abstract: A device may display a presentation of elements (e.g., icons) on a display component. However, display components have a pixel density that affects aesthetic and practical aspects of the presentation (e.g., rendering the presentation at a variable and inconsistent size); yet, many presentations are not generated in view of the pixel density of the display component of the device. Presented herein are techniques for generating and displaying a presentation of elements in view of the pixel density of the display component, using a scale factor set of scale factors that specify a pixel density range and a scale factor value (e.g., 120%) to be applied to the elements of the presentation. The scale factor set may be kept small to reduce the administrative burden on the designer of the element, while also achieving approximately consistent sizing of the presentation on display components having variable pixel densities.

Abstract: This document describes techniques for pre-rendering new content for an application-selectable user interface. These techniques permit a user to select to view application-selectable tiles of the interface and, on selection, quickly see new content through the tiles in the selected portion. In some embodiments, the techniques pre-render content for a portion of a non-visible region of the interface rather than all of the non-visible region to reduce resource costs, such as processor and memory usage on a device and communication bandwidth usage on a communication network.

Abstract: The present invention provides a method and system for reducing the peak to average power ratio (PAP) of a signal with low computational complexity. According to one embodiment, the present invention is applied to reduce the PAP of an OFDM signal. According to an alternative embodiment, the present invention, is applied to reduce the PAP of a CDMA signal. Rather than seeking the optimum solution, which involves significant computational complexity, the present invention provides for a number of sub-optimal techniques for reducing the PAP of an OFDM signal but with much lower computational complexity.

Abstract: A MIMO OFDM system includes a plurality of space-time encoders for encoding respective data blocks with independent space-time codes. The transformed data block signals are transmitted by a plurality of transmit antennas and received by a plurality of receive antennas. The received data is pre-whitened prior to maximum likelihood detection. In one embodiment, successive interference cancellation can be sued to improve system performance. Channel parameter estimation can be enhanced by weighting the channel impulse response estimates based upon a deviation from average.

Abstract: An OFDM system embeds sequence information in the transmitted signal that reduces peak average power ratio (PAP) with minimal impact on the overall system efficiency. A marker is embedded onto the transmitted information that is used to identify the combining (inversion) sequence at the receiver. In one embodiment, selected tones in a cluster are rotated when the corresponding phase factor rotates the cluster.

Abstract: This document describes techniques enabling a presentation format for an application tile. These techniques permit a user to view changes to an application through a tile of a user interface, the tile having one of various presentation formats through which a user may view content associated with those changes.

Abstract: An improved OFDM receiver is realized by employing a simplified delay function for the transmissions channel. The simplified delay function yields a simplified frequency-domain correlation that is applied to develop an Eigen matrix U that is used in developing estimates of the channels. Those channel estimates are used in the receiver to develop the output signals.