Abstract: An autostereoscopic display device comprises: a display panel having an array of display pixels for producing a display, the pixels being arranged in rows and columns; and at least two arrays of light output directing elements, the arrays being arranged in series over the display panel at different depths, each array being controllable to direct the light output from respective groups of pixels in different directions to enable a stereoscopic image to be perceived. The device is operable to selectively control any one of the arrays to provide the light output directing function, thereby providing respective first and second three dimensional display modes having different amounts of perceived depth.

Abstract: The invention relates to a method for use in a packet-switched communication system, the method comprising: sending a first packet from a source node to a destination node, the first packet containing a first set of data bits; sending a second packet from the source node to the destination node, the second packet containing a second set of data bits; wherein, in the event that the first set of data bits cannot be successfully decoded in the destination node, the second packet further comprises a first set of error correction bits for the first set of data bits.

Abstract: A reflective display, comprising a plurality of pixels (10), each having a first electrode, a light-modifying layer (12), and a second electrode (3; 16) arranged to enable formation of an electric field in the light-modifying layer (12) through application of a voltage between the electrodes. The pixel (10) further includes an active portion (16) which is switchable between light-modifying states by means of said electric field, and an inactive portion (17). The inactive portion (17) is arranged for reflecting light so as to direct at least a fraction of incoming light (20) impinging on the inactive portion (17) towards the active portion (16). As a result, a contrast ratio of the reflective display is improved, since light is now directed from the inactive portion towards the active portion and thus contributes to the displayed image as observed by a viewer.

Abstract: An MB OFDM system that includes a coder, responsive to a stream of at least one incoming symbol, to form therefrom a set including channel symbols that correspond to each incoming symbol, such that the channel symbols include the incoming symbol, the negative of the incoming symbol, the complex conjugate of an incoming symbol, and a negative of a complex conjugate of an incoming symbol; an output stage configured to: when two of the channel symbols are complex conjugates of one another, the output stage transforms one of the two channel symbols as the output of a single IFFT and the other of the two channel symbols by a reversal of the index of the output and creates OFDM symbols from the transformed symbols using an IFFT such that the two transformed OFDM symbols are copies of each other with inversed indices.

Abstract: The invention refers to a device, a method and a computer program product for extracting motion information from a sequence of video frames. Existing solutions for extracting motion information from sequence of video frames need a massive computing power which make it difficult and expensive to implement a real-time system. It is therefore an object of the invention to simplify such a device and to provide a real-time embedded system. It is suggested to provide a device comprising a digital video camera 1. The video camera 1 includes a processing unit 3 for processing video frames grabbed by the video camera 1. The processing uses a 3D recursive search block matching algorithm to extract the motion information from the video frames. The device can be used for traffic surveillance applications, e.g. for determining the speed of vehicles on the streets and roads.

Abstract: In a stereoscopic display apparatus having optical directory elements such as lenticular elements (4) extending parallel to each other and being slanted at an angle to one of the rows and columns of picture elements the appearance of so called dark bands is prevented by certain combinations of the slant angle and the lens pitch.

Abstract: A display device includes a display arrangement and an optical attenuator arrangement. The display arrangement has inherent non-uniformity of an output intensity across the display area. The optical attenuator arrangement is positioned in front of the display arrangement and in registration with the display area. The optical attenuator arrangement has a light attenuation characteristic that varies across the display area and is adapted to optically reduce the inherent non-uniformity of the output intensity.

Abstract: A complementary medium access control (CMAC) method and apparatus are described. A method of wireless communication includes transmitting a request-to-send (RTS) frame and transmitting a clear-to-send (CTS) frame. The method also includes transmitting a partner-to-send (PTS) frame. A wireless network includes a source station adapted to transmit a RTS frame and a destination station adapted to transmit a CTS frame. The wireless network also includes a partner station adapted to send a PTS frame.

Abstract: The present invention provides a system (300-400), apparatus (300-400), and method for an energy-based antenna selection technique in which the antenna that observes the largest SNR averaged over all carriers per sub-band (405) is selected for space-time coded MB-OFDM systems. Due to the frequency-selective nature of the system, different sub-band may have different channel gaining effect from the multi-path channels. We can perform energy-based antenna selection per sub-band, and the simulation results show that the proposed technique works not only for MB-OFDM UWB channels with shadowing, but also for the same channel without shadowing.

Abstract: A method of providing a medium access control protocol using a listen before-talk scheme within a wireless network having a plurality of stations communicating over a channel, wherein a valid route from a source station to a destination station via at least one more station is determined, said method comprising: transmitting a data packet over said channel by a first station; receiving said data packet in a second station; analyzing data in said data packet by said second station whether said data packet is to be forwarded further; and if said data packet is to be forwarded further, prioritizing transmission of said data packet on said valid route.

Abstract: The invention relates to an electrostatic particle filter for removing particles from air. The electrostatic particle filter includes a filter medium (3) with first and second opposite sides, a first electrode (1) and a second electrode (2), the first electrode (1) and second electrode (2) being conformally provided on the first and second sides of the filter medium (3), respectively. The first electrode (1), the second electrode (2), and the filter medium (3) are arranged to allow an electrical conduction current through the filter medium (3). The first electrode (1) is a moderately-conductive electrode having a sheet resistance in a range with a lower boundary value of about 106 Ohm per square and an upper boundary value of about 1012 Ohm per square, at a relative humidity of 30%. The invention also relates to an electrostatic filtration system including the electrostatic particle filter, and a particle charging section (6).

Abstract: The present invention provides a system (400), device (200, 300), and method (200) for a spatial multiplexing (SMX) transmission scheme combined with symbol spreading and rotation using a pre-determined matrix R, which can greatly improve system performance without requiring additional bandwidth or power consumption under fast Rayleigh flat fading channels or high frequency-selective channels in UWB systems. Because of the lattice-based structure, sphere decoding is employed to reduce the complexity of ML decoding while maintaining the near ML performance. On the other hand, ZF and MMSE receivers can also be used due to the systematic structure at the transmitter.

Abstract: To maximize power saving performance without compromising on the QoS requirement of an application stream, a method and wireless network device generates a subset of a periodic service interval can be used for medium time allocation and data and information can be transmitted in contiguous medium time allocated this way. This selection of a period of time below service capacity allows multiple applications access the medium and for the selection of contiguous medium time during which data transmission can occur.

Abstract: A wireless device (A) in a first antenna sector (40) is discovered using a directional antenna (322), which sends and receives signals in multiple antenna sectors. Multiple primary beacons are transmitted in corresponding primary beacon time slots (1P-4P), which correspond to the antenna sectors (10-40) and have associated secondary beacon time slots (1s-4s). A secondary beacon is received from the wireless device in a first secondary beacon time slot (4sA) associated with a first primary beacon time slot (4P) corresponding to the first sector, the secondary beacon being responsive to a first primary beacon included in the first primary beacon time slot. An additional first secondary beacon time slot (4s) is added in association with the first primary beacon time slot. The additional first secondary beacon time slot enables an additional wireless device in the first sector to send an additional secondary beacon in response to a subsequent first primary beacon included in the first primary beacon time slot.

Abstract: A system, apparatus, and method are provided for dynamically selecting the data rate and/or transmit (TX) power. The method consists of devices periodically transmitting beacon frames in which they include data rate and/or TX power feedback for all senders of data streams, of which the devices are a receiver. The feedback may consist of recommended values for data rate and/or TX power or of channel state information. A sender chooses data rate and/or transmit power considering the feedback from the one or several receivers of the stream. The invention especially relates to systems based on an Ultra Wide Band Medium Access Control Protocol.

Abstract: A switchable autostereoscopic display device comprising: a display panel having an array of display pixels for producing a display, the display pixels being arranged in rows and columns; an array of lens elements arranged over the display panel for directing the light output of the display pixels so as to provide a stereoscopic image, the lens elements comprising an electro-optic material whose refractive index is switchable by selective application of an electric field between a first value that maintains the light output directing function and a second value that removes the light output directing function; and discontinuous electrode layers provided above and below the lens elements for applying the electric field across the lens elements. The electrode layers are spaced from the lens elements by dielectric layers, such that the effect of the electrode layer discontinuities on the electric field in the lens elements is reduced.

Abstract: Conventional accelerometers are based on test masses that are suspended in some kind of spring damper system. According to an exemplary embodiment of the present invention, a two-dimensional adaptive accelerometer based on dielectrophoresis is provided, which measures an acceleration of a test mass freely floating in a medium by determining the movement of the test mass due to an accelerating force acting on the test mass. A non-uniform electric force field provides for a wide and adjustable dynamic range.

Abstract: Methods and nodes are provided herein that can generate reliable acknowledgements within the time-frame required to transmit a single message over a decoupled connection so as to meet the real-time requirements of the CEC protocol. Specifically, there is provided a method in a communication system, the communication system comprising a first device, a second device, a first node and a second node, the first and second nodes being connected via a decoupled connection, the method comprising sending a plurality of data packets from the first device to the second device via the first and second nodes; on receiving a data packet from the first device, providing an acknowledgement for said data packet from the first node to the first device; wherein the acknowledgement provided to the first device corresponds to an acknowledgement provided to the first node from the second device in respect of a data packet preceding said data packet.

Abstract: Wireless networks in ISM bands are usually established by placing access points that link terminals to each other and to networks. This situation may pose problems when networks are established individually without coordination, for example, in different apartments of apartment buildings. According to the present invention, access points establish a communication channel, linking each other, to cooperatively coordinate and optimize the use of frequencies/channels. Advantageously, interferences occurring in such networks may be reduced.

Abstract: This invention relates to a method and an arrangement for embedding a watermark pattern in an information signal. A method of embedding a watermark pattern in an information signal comprising the steps of determining a robust signature as a set of robust features in said information signal, creating a watermark pattern as a signature dependent function of a predefined basic watermark pattern and embedding said watermark pattern in said information signal. The invention also relates to a corresponding method and arrangement for detecting a watermark pattern in an information signal.