342 results about "Wireless broadcast" patented technology

A method, system, and program for responding to recipient ratings of wirelessly broadcast electronic works are provided. A secondary player receives a wireless broadcast of an electronic work from a primary player. Next, responsive to a playback of the electronic work from the secondary player, the secondary player requires a recipient of the electronic work to rate the electronic work. Then, responsive to the recipient rating the electronic work or an automatic rating selection made based on the recipient's preferences, the options available to the recipient may be dynamically adjusted. First, responsive to the recipient rating the electronic work with a favorable rating, the secondary player triggers a purchase offer for the electronic work when the secondary player is connected to a network providing access to a purchase server. Second, responsive to the recipient rating the electronic work, the secondary player transfers the rating to the primary player, such that the primary player is enabled to dynamically adjust a next electronic work selection for broadcast based on the rating for the previously broadcast electronic work.

A high frequency signal transmission apparatus includes a transmitter for transmitting received signals from a signal source as a modulated signal on a high frequency 900 MHz carrier to a remote receiver. The remote receiver converts the high frequency carrier in at least one conversion step to a lower frequency carrier signal. The lower frequency carrier signal carrying the modulated signal is then converted to another carrier signal and retransmitted as a modulated second signal to another remote receiver capable of demodulating the signal and broadcasting the audio sounds or video images. The oscillators in the transmitter and receiver are selectable to operate at discrete frequencies. Automatic fine tuning control is provided in the receiver to accommodate drift of the oscillator in the receiver. A recorder is coupled to the receiver for temporarily storing a demodulated first signal from the transmitter and then outputting the stored signals to a second transmitter for retransmission to a remote output device.

Digital multimedia is broadcast to wireless receivers on a unidirectional wireless broadcast channel, while control data necessary for presentation of the multimedia is provided on a bidirectional, point-to-point wireless link.

A method, system, and program for tracking locally broadcast electronic works are provided. According to one aspect of the invention, a sending player locally broadcasts an electronic work. In particular, the local broadcast may be a wireless broadcast creating an ad-hoc radio system. At least one recipient player receives the localized broadcast of the electronic work and accepts a distribution cookie for tracking distribution of the electronic work. The at least one recipient player updates the distribution cookie with tracking information about the broadcast of the electronic work, including ratings by users at the second player and purchase of the broadcast electronic work. Each of the at least one recipient players may in turn become a sending player that broadcasts the electronic work to other recipient players and requires the other recipient players to accept a copy of the distribution cookie updated by the second player. Then, responsive to detecting a network connection to a statistics server, the at least one recipient player provides the distribution cookie to the statistics server, such that localized broadcast distribution of the electronic work is tracked.

A method, system, and program for controlling access to wirelessly broadcast electronic works during playback are provided. A wireless broadcast of an electronic work with digital rights rules is received from a primary player at a secondary player. Synchronous play of the electronic work at the secondary player may be enabled while the secondary player is within reception range of the primary player. A sample of the streamed electronic work with digital rights rules is stored at the secondary player. Responsive to detecting that the secondary player has moved outside reception range of the primary player, the secondary player only allows playback of the stored electronic work according to the digital rights rules.

The present invention provides methods, apparatus and systems for delivery of digital data to stationary receivers over a terrestrial wireless link at a low data rate using a new coded orthogonal frequency division multiplexing (COFDM) scheme. Digital data is encoded and modulated using coded orthogonal frequency division multiplexing (COFDM) to produce a data stream. The data stream is communicated to a stationary receiver via a terrestrial wireless link having a ratio of (i) 50% coherence bandwidth to (ii) allocated channel bandwidth of not greater than 50%. The COFDM scheme employed by the present invention overcomes the degradation of multipath fading induced by terrestrial channels, such as the Ultra High Frequency (UHF) broadcast channel.

A wireless audio dissemination system includes a plurality of television monitors configured to display video content from a media source coupled thereto. The system further includes a plurality of transmitters coupled to an associated one of the plurality of television monitors and configured to propagate a wireless broadcast stream including audio content corresponding to video content displayed on the associated television monitor. At least one mobile device is configured to wirelessly communicate and receive the broadcast stream from each of the plurality of transmitters and allow a user to selectively receive the associated audio content from one of the plurality of transmitters.

A method and apparatus for transmitting a plurality of data streams in a wireless broadcast system are provided. The method includes mapping the plurality of data streams onto a super-frame that includes a plurality of frames; inserting signalling information in a first signalling information field for assisting in the reception of a first number of said plurality of data streams for a given frame, the first number being less than or equal to a limit applicable to each of the plurality of frames; dependent on a number of data streams for the given frame being greater than the limit, inserting signalling information in a second signalling information field; inserting said first and second signalling information fields in a preamble section of said given frame; and transmitting the plurality of frames.

The present invention discloses a multi-carrier digital multimedia broadcast system and the digital information transmission method thereof. After RS encoding and byte interleaving, LDPC encoding, bit interleaving and constellation mapping to an upper layer of data streams in turn, the obtained data symbol is multiplexed with scattered pilots and continual pilots which include the system information to form an OFDM frequency domain symbol and scrambled; an OFDM time domain symbol is generated by IFFT transforming, and after inserted with the frame head to build a time slot, it is connected to form a signal frame of the physical layer; the signal frame of the physical layer is transmitted after being low-pass filtered and orthogonal upconverted. The system and method thereof provide wireless broadcast with high quality such as audio, video and multimedia data and the like for mobile, fixed and portable receivers, and can use the satellite transmission and terrestrial transmission method for transmitting. The method utilizes the LDPC OFDM scheme, and the system applies the microwave and large scale integrated circuit technologies while fulfills the needs for low cast and high performance.

Methods and systems are provided for concealing identifying data that may be used to identify a beacon or device in broadcasts unless an observer device is able to directly or indirectly, via an authorized resolver device, translate an encrypted broadcast into the identifiable information. The wireless security scheme disclosed herein also pertains to resolving the concealed data messages to obtain the identifiable information.

The invention discloses a tracing method of residual frequency deviation based on OFDM system carrier to proceed dynamic compensation for the evaluated value of residual frequency deviation, which comprises the following steps: evaluating the residual frequency deviation; tracing the step-length to select; compensating the frequency deviation dynamically; avoiding to count the specific value of phase rotation of continual frequency symbol in the OFDM symbol; reducing the counting quantity greatly; finishing the weighted mean with low tracing variance; setting the transformation criterion between big and small step lengths flexibly; fitting for mobile broadcast of satellite, wireless broadcast of ground and so on widely.

The invention discloses a non-networking access system based on a mobile terminal. The non-networking access system comprises a cloud-end server device, a non-networking access unit device and the mobile terminal, wherein the mobile terminal acquires access right information of a user and attribute information of an access unit; the non-networking access unit device sends a wireless broadcast message periodically; the mobile terminal detects the wireless broadcast message of the non-networking access unit and establishes wireless communication connection with the non-networking access unit; the mobile terminal sends a door-opening request to the non-networking access unit device by the established wireless communication connection; and the non-networking access unit device verifies the door-opening request of the mobile terminal and executes corresponding access right operation. The non-networking access system disclosed by the invention has the advantages that a user can use the access system only by carrying the mobile terminal without needing to swipe cards or adopting other means such as biological identity identification, and also does not need the networking to the access system, so that the use is faster; and compared with the networking system, a large amount of network cost is saved.

Methods, including service methods, articles of manufacture, systems, articles and programmable devices provide personalized, real-time travel information to a passenger of a transit system. A passenger provides a destination input to a programmable personal digital assistant, which establishes wireless communication with a wireless broadcast system of a transit system and uploads current routing and scheduling information, processing and presenting information to the passenger as a function of destination and passenger preference. The personal digital assistant also selects and wirelessly locates and communicates directly with the identified transport, alerts the passenger of a recommended boarding opportunity, recognizes a boarding by the passenger, confirms that a boarded transport is the recommended transport, and communicates a disembark alert to if the boarded transport is not the recommended transport or upon an arrival at a destination, the alert configured pursuant to the passenger preference.

Methods, systems and devices for locating a wireless identity transmitter (110) with a central server (120) connected with one or more proximity broadcast receivers (138, 142), such as stationary receivers (142) or mobile devices operating as wireless receivers (138). The wireless identity transmitter (110) may be a device configured to broadcast messages, such as through (img file shown in the description) advertisements, including an identification code. When within proximity, a proximity broadcast receiver (138, 142) may receive broadcast messages from the wireless identity transmitter (110) and relay location information along with the wireless identity transmitter's identification code to a central server (120) as sighting messages. The proximity broadcast receiver's own location may provide an approximate location for the wireless identity transmitter. The central server may process sighting messages, including signal strength information, to accurately locate the wireless identity transmitter. The central server may transmit data to third-party devices when receiving sightings messages.

The invention discloses a physical layer safety method based on artificial noise power distribution, and relates to a physical layer safety method. The objective of the invention is to solve the problems of high confidentiality interruption probability and poor confidentiality in an existing broadcasting system. The method comprises the following steps: 1, transmitting a signal by a transmitting end; 2, calculating a received signal reaching the kth legal receiver end and a received signal reaching the eavesdropper end; 3, calculating the signal to interference plus noise ratio of the kth legal receiver and the signal to interference plus noise ratio of the eavesdropper; 4, calculating the instantaneous confidentiality capacity of the kth legal receiver; 5, calculating an optimal artificial noise power distribution factor; and 6, calculating the confidentiality interruption probability according to different artificial noise power factors, and drawing a change curve of the confidentiality interruption probability along with the artificial noise power distribution factor to obtain the artificial noise power distribution factor meeting the requirements. The invention is applied to the field of physical layer security of a wireless broadcast communication system.

A method and system for wirelessly connecting a client device to a wireless network's access point. When a first client device detects a Wireless Broadcast Storm During Active Scan Association (WBSDAASA) caused by a large block of other client devices attempting to simultaneously wirelessly connect to the access point using an active scan, the first client device switches to either a passive scan or a random roam active scan to connect the first client device to the access point. The first client device is thus able to avoid a connection live-lock caused by the WBSDAASA.

Geographically-relevant information is provided to mobile users by having an information source provide location-referenced information to one or more backend server systems. In response, the backend server system determines a region for which the received location-referenced information is relevant, and then identifies one or more specific cellular base stations that provide wireless broadcast service over an actual broadcast region which covers at least a majority of the determined region. A condition message may then be provided to each of the identified cellular base stations, which are correspondingly instructed to wirelessly broadcast the message over the actual broadcast region.

A method for supporting cross carrier indication of a control channel change notification for at least one wireless communication unit that is operating on a first serving communication cell and has been configured with access to at least one second serving communication cell in a wireless broadcast communication system. The method includes, at the base station: generating a message including a broadcast service identifier, wherein the broadcast service identifier identifies a control channel change of the at least one second serving cell accessible by the at least one wireless communication unit; and transmitting the message to the at least one wireless communication unit.

A method supporting control channel change notification for at least one wireless communication unit capable of operating on a first serving communication cell and configured with access to at least one second serving communication cell in a wireless broadcast communication system. The method includes, at a broadcast server: supporting communication with at least one wireless communication unit via the at least one second serving communication cell; generating a message including an indication that a control channel change notification will be sent in the at least one first serving communication cell; transmitting the message to the at least one wireless communication unit operational in the at least one second serving communication cell; and transmitting the control channel change notification in the first serving communication cell.