181results about "Frequency-division multiplexing selection" patented technology

A method of transmitting data in a wireless communication system comprises receiving feedback data on an uplink data channel, the feedback data comprising a precoding matrix indicator (PMI), wherein the value of the PMI corresponds to an index in a codebook, transmitting a precoding scheme for downlink data on a downlink control channel, wherein the preceding scheme is determined as one of at least two of a transmit diversity irrespective of the received PMI, an acknowledgement indicating preceding according to the received PMI and a new PMI indicating that it is used in precoding downlink data to be transmitted, and transmitting the downlink data on a downlink data channel after applying precoding according to the determined preceding scheme.

A user terminal connection control method to limit the number of sessions simultaneously connectable to the Internet, wherein an access server or authentication server has a user management table for specifying the maximum number of connections and a preferential terminal identifier indicating a user terminal to be preferentially connected to the Internet for each group comprising a plurality of user identifiers. The access server or authentication server determines, during a communication procedure for authenticating a user who requests to access to the Internet, whether the current number of connections for a group to which the user belongs has reached the maximum number of connections, and if so, determines whether to allow the user terminal to connect to the Internet depending on whether the user terminal identifier matches the preferential terminal identifier.

A few high power tones used for synchronization and/or other purposes are transmitted in a FDM system during a period of time, e.g., a symbol transmission time period. During normal data transmission symbol periods signals are transmitted using at least 10 tones, e.g., per symbol time. Less than 5 high power signals are transmitted in a symbol time with at least 80% the maximum total transmitter power transmitted being allocated to the high power signals where the maximum total transmitter power is determined from a period of time which may includes one or more data and/or high power tone transmission periods. When the high power tones are transmitted at most 20% of transmitter power is available for transmitting other tones with the power normally being distributed among multiple tones. Normally some tones which would be transmitted in a symbol time go unused during transmission of the high power signals.

A secure gateway is disclosed which facilitates communication between a first network and a second network through an intermediate network. The secure gateway, when operated in conjunction with at least one other secure gateway, supports secure peer to peer connectivity with integral security features such as mutual authentication, authorization specific access, and end to end auditing. An authorized service can be served securely through this gateway, across the open network, to a known requester, without fear of compromising the security or privacy of the server's or requesters networks.

A hybrid coaxial cable network employing interdiction to ensure privacy in telephony communications. The video and telephony signals are secured such that telephony and interactive video signals to and from a subscriber do not appear on the network at any other undesired subscriber location.

The Intelligent Multiservice Access System (IMAS) enables support for the next generation of virtual connections. Regardless of whether the communications lines coupled to the inputs and outputs of the IMAS are based on SVC, PVC, or a combination of PVC and SVC, the IMAS can support SVCs for a more flexible, timely, efficient, and manageable connection. In the more typical configuration, the loop side of the IMAS is PVC-based because the modems do not support SVC signaling, and the telecommunications backbone side is capable of supporting SVC signaling even though existing DSLAMs do not employ SVC signaling logic. With SVC support, the IMAS assists the ATM network in hand crafting an SVC-based connection almost immediately between end users when the originating end user wants to make a call to a destination end user, and tear down that virtual connection almost immediately when that call has completed. The SVC signaling is performed by a proxy signaling agent that resides in the IMAS to give the appearance to the ATM network in the telecommunications backbone that the loop side supports SVC signaling even though the line is PVC-based.

In an OFDM communication system that performs OFDM data communication by dividing a band region into a plurality of bands and assigning each band to a mobile station, a base station monitors transmission characteristics of the bands and state of use of adjacent bands, then sets whether to use or not use guard band regions between bands for data transmission based upon the transmission characteristics, and the state of use of the adjacent bands.

A diversity OFDM communication is performed between a base terminal and a mobile terminal, both having a horizontal polarization antenna and a vertical polarization antenna forming two transmission channels. In the base terminal, data signals to be transmitted are divided into two channels to transmit the data signals through either one of the channels having a higher transmission performance for each sub-carrier. Common pilot signals are transmitted through both channels. The data signals received by the mobile terminal are phase-adjusted using the common pilot signals. The phase-adjusted data signals in both channels are synthesized and then demodulated.

The present invention provides reduced power dissipation and other benefits at the optical transport network layer by utilizing a digital subcarrier optical network comprising multiple digital subcarrier cross-connect switches. This offers several advantages for optical networks, including spectral efficiency and robustness against signal corruption and consumption of less energy than traditional TDM-based electric switches (OTN/SONET/SDH).

This invention relates to LANs at a customers' premise, especially to the HomePNA technique. The idea of the invention is that voice band terminals and HomePNA (HPNA) stations are hidden from a distribution network by a band division filter in a way that performance of ADSL is not degraded by presence of an HPNA LAN. The band division filter incorporates two subfilters: a POTS filter and an HPNA filter. The latter implements a band stop function maximizing insertion loss at the ADSL band The band division filter can be installed to needed telephone sockets.

Various devices are provided for conveniently storing, transporting and recharging wireless headsets and associated devices. According to some embodiments, a dongle is formed to receive a portion of a wireless headset, thereby bringing together electrical contacts of the dongle and electrical contacts of the wireless headset, thereby permitting convenient recharging of the wireless headset. In some embodiments, a dongle is integrated into a holster or carrying case for a wireless headset and/or an external device such as a telephone.

The method for reducing the rate of registration in CDMA-based mobile networks is a method for preventing a traveling mobile device from registering within a new, or secondary, registration area, prior to physically relocating from a first, or current, registration area to the new registration area. The mobile device has a storage memory associated therewith, for storing a database containing geographic coordinates defining boundaries of a plurality of registration areas. The mobile device scans for a new registration pilot signal associated with a new registration area, and upon detection, the geographic location of the mobile device is determined. This geographic location is compared with the coordinates of the boundaries stored within the database, and if the mobile device is determined to be within the boundary defining the new registration area, the mobile device is then registered with a base station of the new registration area.

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.

The invention provides a vehicle to everything (V2X) business transmission method and device, and a resource allocation method and device. The V2X business transmission method includes that a first onboard unit OBU acquires the transmission resources for transmitting the V2X business, the transmission resources include the resources required to send the V2X business data and scheduling information in the V2X business, the scheduling information refers to the information indicating the resource scheduling of the V2X business data, the first OBU transmits the scheduling information and the V2X service data to the second OBU on the transmission resources, the scheduling information and the V2X business data are subjected to frequency domain multiplexing in the same subframe in the transmission resources and the scheduling information indicates that the V2X business data is subjected to resource allocation in the same and/or different subframes. According to the invention, the problem that the D2D technology in the prior art can only send the resource scheduling information and V2X business data separately is solved, and the gaps in the relevant technology are filled.

The present disclosure generally pertains to systems and methods for communicating data. In one exemplary embodiment, a system has a high-speed channel, such as an optical fiber, between a network facility, such as a central office (CO), and a first intermediate point between the network facility and a plurality of customer premises (CP). Digital communication links, such as DSL links, are used to carry data between the first intermediate point, such as a feeder distribution interface (FDI), and a second intermediate point, such as the Distribution Point (DP). Non-shared links may then carry the data from the second intermediate point to the CPs. The links between the two intermediate points are bonded to create a high-speed, shared data channel that permits peak data rates much greater than what would be achievable without bonding. In some embodiments, multicast data flows may be prioritized and transmitted across a set of connections to each of the intermediate points. In addition, it is possible to power components at the intermediate points from one or more of the CPs.

A multi-port DSL system terminates a plurality of DSL channels that are multiplexed through a data path of a DSL transceiver. In one embodiment, data path events are generated based on the data transmission in each of the channels. When the data path becomes available to process a next data symbol, the data path processes a data symbol for the channel indicated by the data path events. Optionally, the data path may process a data symbol for a particular channel only if a predetermined amount of time has elapsed since a data symbol was processed for that data channel.

A method and apparatus for modifying a cable network to create a local area network is disclosed. By employing a communications modem configured to transmit first communication signals over one or more coaxial cables using a first allocated spectrum designed to avoid contention with ongoing upstream television control signals, an infrastructure capable of carrying demand cable television and LAN signals can be created.

An emergency alert system for alerting DSL subscribers of imminent perils includes an alert server connected over a direct link to an edge node of a metro network for receiving an event notification, configuring from an event notification a highest priority alert message, and broadcasting the alert message to subscriber terminals over the metro network. An add multiplexer (ADM) multiplexes the alert traffic with the regular traffic onto the direct link, anthe multiplexed traffic reaches the edge node of the metro network, which is configured with a high priority policy. The edge node discards the lower priority traffic in the presence of the alert traffic and an applet installed on said subscriber terminal accepts and displays the alert message in a browser or a media player.