1414 results about "Communication channel" patented technology

A WLAN system adapted to apply QoS differentiation to a media stream to be transmitted from a transmitting station (STA) to a receiving STA of that system. The transmitting STA processes the media stream to generate a base sub-stream and one or more enhancement sub-streams for subsequent transmission over a wireless communication channel and assigns different priorities to different sub-streams. Depending on the channel conditions, the transmitting STA may select to discard, without transmission, portions of data from enhancement sub-streams. The selection process is based on the assigned priority and operates to preserve as much of relatively high-priority data as possible. The receiving STA then processes the received data to generate a reconstructed media stream, which provides signal quality equal to or better than the signal quality supported by the base sub-stream. Advantageously, a WLAN system of the invention is adapted to change signal quality dynamically and incrementally in a manner commensurate with current channel conditions without the need for communication between the higher and lower network layers. In addition, it provides gradual and graceful degradation of signal quality when channel conditions deteriorate as opposed to abrupt degradation inherent in analogous prior art systems.

A wrist-mounted device for measuring at least one physiological parameter of a subject. The present invention enables such a measurement to preferably be transformed into clinically useful information about the subject. Such information may then optionally be sent to medical personnel, for example at a contact and/or monitoring center, through a gateway device. The gateway device preferably communicates with the wrist-mounted device of the present invention through a wireless communication channel.

Various exemplary embodiments of the present disclosure describe systems and methods for charging electronic devices using wireless power delivery systems. The described systems include one or more wireless power transmitters, one or more wireless power receivers and one or more electronic devices. Electronic devices may be able to communicate with wireless power transmitters and wireless power receivers using suitable communications channels. The disclosed systems are capable of associating a wireless power receiver with a customer to deliver power to a customer's device.

A system and method for improving digital communication in a wireless mobile ad-hoc network. More specifically, the system includes one or more portable network devices operable to support the seamless operation of a self-initializing, self-healing, adaptive portable network. The portable network devices implement protocols that provide bandwidth management capabilities for use with radios, routers and other wireless network devices. Each portable network device includes at least one wireless transceiver, a processor and control software. The processor and control software are logically coupled to the wireless transceiver to facilitate digital communication via a plurality of communication channels with other network devices.

Method and apparatus for transmitting messages between communication devices via a communication channel allowing at least voice messages to be transmitted, the messages including data subdivided in a sequence of basic data units, the method including; a) encoding the basic data units as unique signals (us_j) including a predetermined number of basic signals (b_i), each basic signal having a unique fixed frequency (f_i); b) transmitting a sequence of unique signals (us_j) during a sequence of fixed time periods (t1, t2, t3, . . .); c) receiving and decoding the sequence of unique signals (us_j) into the sequence of basic data units; the data being transmitted in superposition over voice.

A message system for delivering data in the form messages between message clients comprises a server cluster with a group of client manager nodes and a group of independent message manager nodes. The client manager nodes have the function of managing client connections, whereas the message manager are configured to store and distribute messages. The system further comprising communication channel means in the form of a multicast messagebus for providing a multicast communication channel between said at least one client manager node and said at least one message manager node. The system guarantees delivery of a message by storing it until a receiver is ready to consume it.

A system for authenticating and/or authorizing users of a service includes one communication interface with an access communication channel and another communication interface with a confirmation communication channel. Requests for a user to access a service are received over the access communication channel, and confirmation codes for the user are received over a trusted confirmation channel, such as an SMS text messaging system. Confirmation codes may be received from the user requesting access to the service or by a third party acting as a gatekeeper to the service. The system tests the validity of received confirmation codes, and enables the user to access the service if a valid confirmation code is received.

Disclosed is a unique system and method that facilitates more efficient sharing or transporting of content between at least any two computers. In particular, the type, security, and/or size of the content desired for “sharing” from one location (e.g., primary location) to another (e.g., remote or secondary location) can be examined. This information can be employed when determining which communication channel to utilize to effectuate the sharing process. This determination can also be based at least in part upon which communication channels are open and available between at least any two computers. Other factors that can influence the manner in which content can be transported or shared include the communication connection type or speed, the security associated with the connection, the identity user(s), as well as access or sharing rights.

Methods and apparatus for aggregating communication channels. In one exemplary embodiment an aggregation device is required only on one side of the set of communication channels being aggregated. Advantageously, no modifications to the source and/or destination of data transfers are required for operation of the invention. In one embodiment utilized for data transfers in the downstream direction, object download requests can be fulfilled by sending a sequence of partial download requests through the set of communication channels being aggregated, and forwarding the resulting partial data objects received to the original requester in the proper order. In another embodiment utilized for upstream data transfers, traffic is bifurcated to travel along a set of communication channels, and the bifurcated traffic is reassembled either at the network layer or the transport layer.

The present invention provides an on-vehicle communication device capable of suppressing a delay in providing information, avoiding congestion, and sufficiently securing transmission power. An on-vehicle communication device (100) according to the present invention includes communication control means (3) that controls a transmission cycle and transmission power when data is transmitted from transmitting/receiving means (2). The communication control means (3) uses own vehicle information and surrounding vehicle information to estimate a degree of risk (R) and a safe distance (Ds) of own vehicle. The communication control means (3) controls the transmission cycle of own vehicle based on a communication channel utilization rate of own vehicle, a communication channel utilization rate of a surrounding vehicle and the degree of risk (R) of own vehicle. The communication control means (3) controls the transmission power of own vehicle based on the communication channel utilization rate of own vehicle, the communication channel utilization rate of the surrounding vehicle and the safe distance (Ds).

The technique of the present invention prevents troubles, such as the lowered baud rate, in wireless communication. In a wireless LAN connecting with multiple devices, when a baud rate between two devices is lowered to or below a preset level, the procedure of a first arrangement compares MAC addresses of the two devices and switches over the communication channel of a device having the smaller MAC address, while keeping the communication channel of a device having the greater MAC address. When the baud rate is lowered to or below the preset level, the procedure of a second arrangement temporarily switches over the working communication channel from an original communication channel to another communication channel. When wireless communication in a predetermined unit is completed, the procedure makes a re-switchover to the original communication channel.

A method and apparatus for preserving loop fairness. Some embodiments include a dynamic half-duplex feature. One aspect includes a communications channel system and method for preserving loop fairness that includes a first channel node having one or more ports, each port supporting and attached to a fibre-channel arbitrated-loop serial communications channel. One of the ports will arbitrate for control of that port's attached channel, wherein control of the channel loop, once arbitration is won, a fairness-preserving apparatus causes control of the communications channel to be released based at least in part on whether a predetermined amount of use has occurred between the first port and the communications channel. In some embodiments, the predetermined amount of use includes a transfer of a first predetermined amount of data. In some embodiments, release of control of the channel is inhibited if less than a second predetermined amount of data remains to be transferred.

A method and system for wireless communication channel estimation. A frequency offset hypothesis is determined. An interchannel interference (“ICI”) matrix based on the frequency offset hypothesis is generated. Pilot channel estimates based on the ICI matrix are obtained. A correlation error of the pilot channel estimates to the frequency offset hypothesis is calculated. The correlation error is compared with a predetermined correlation error value. The frequency offset hypothesis is updated and the aforementioned steps are iteratively repeated if the correlation error is greater than the predetermined correlation error value. The pilot channel estimates are used to estimate the wireless communication channel.

A noise suppression circuit for a communications channel (12) comprises a noise reference extraction device (14), for example a hybrid transformer or circuit, for extracting from an input signal (S) a reference signal (NCM) corresponding to a noise component in the input signal and supplying the noise reference signal to a noise estimation unit (16) which derives therefrom a noise estimate (Yj) which is subtracted from the input signal to produce a noise-suppressed output signal (DOUT). The noise suppression circuit comprises a first analog-to-digital converter (24) for digitizing the input signal at a first sampling rate (Fs) and a second analog-to-digital converter for sampling the noise reference signal (NCM) at a second, lower sampling rate (FS/M), the ratio (M) between the two sampling rates being an integer. A decimator (40) decimates the input signal to produce a decimated signal (Dj+Nj). An adaptive filter (34) produces a noise estimate signal (Y'j) that is subtracted from the decimated signal to produce an error signal (epsij) which is used by adaptive filter (34) to adjust its coefficients. An interpolator (36) interpolates the interim noise estimate signal (Y'j) by the same integer (M) to provide a noise estimate signal (Yj) which is subtracted from a digitized and delayed version of the input signal to produce the noise-suppressed output signal (DOUT).

Near-end equipment for a communication channel with far-end equipment. The near-end equipment includes at least one loudspeaker, at least two microphones, a beamformer, and an echo canceller. The communication channel may be in one of a number of communication states including Near-End Only state, Far-End Only state, and Double-Talk state. In one embodiment, when the echo canceller determines that the communication channel is in either the Far-End Only state or the Double-Talk state, the beamformer is configured to generate a nearfield beampattern signal that directs a null towards a loudspeaker. When the echo canceller detects the Near-End Only state, the beamformer is configured to generate a farfield beampattern signal that optimizes reception of acoustic signals from the near-end audio source. Using different beamformer processing for different communication states allows echo cancellation processing to be more successful at reducing echo in the signal transmitted to the far-end equipment.

In a communication network (100) comprising a plurality of wireless devices (120), a method determines whether to change one or more communication channels over which the wireless devices (120) communicate. The method includes receiving a plurality of configuration parameters for the communication network (100); receiving information related to one or more communication channel's availability for communications by one or more of the wireless devices (120); and determining whether to change one or more communication channels over which the wireless devices (120) communicate by executing a communication channel change determination algorithm using the configuration parameters and the received information related to one or more communication channel's availability for communications by one or more of the wireless devices (120).