摘要:
A method and apparatus for responding to a blockage environment (50) in a communication system includes creating (158, 163) a terminal blockage profile and/or a satellite blockage profile with respect to terminal antenna (19) and responding (200) to the terminal blockage profile and/or the satellite blockage profile to prevent fading and/or blocking of communication pathways (15, 18) between one or more satellites (12) and the terminal (16).
摘要:
An intelligent digital beam former (10) in conjunction with a satellite based array antenna (20) provides a plurality of dynamically controllable antenna beams (52) for communication with subscriber units (90) in response to demand for communication services. Geographic portions within the satellite's footprint that have a higher-demand for communication services are dynamically provided additional antenna beams while geographic portions having a lower demand for communication services are provided less antenna beams. When used on a non-geostationary satellite, the digital beam forming coefficients are dynamically adjusted to steer the antenna beams to maintain their ground location. The antenna beams are also shaped to help optimized geographic coverage.
摘要:
A synchronizer operates to achieve initial synchronization with a TDMA acquisition signal exhibiting a potentially large Doppler. The synchronizer collects samples of a baseband signal during a timing window. A fast Fourier transform (FFT) is performed on the samples to generate a set of spectral data. The window is moved to an identical point in a subsequent frame and the FFT repeated until a high-confidence spectral data set is obtained. If the spectral data set indicates energy concentrated around a discrete frequency, then that discrete frequency represents an estimate of the acquisition signal's frequency. The timing window's timing parameters represent a time slot estimate of the acquisition signal. If the spectral data set indicates energy spread more or less uniformly over the spectrum, then no estimates are indicated and a new window is positioned at a different point in subsequent frames.
摘要:
Distortion introduced in phase modulated RF signals by amplifiers and other signal processors is substantially reduced by modifying complex modulating signals I,Q in a way that compensates for the amplifier phase error .phi..sub.e as a function of amplifier power P. In a preferred embodiment, I, Q are combined to calculate the amplifier power level and scaled by a parameter, e.g., K1=-d.phi..sub.e /dP, to provide factor B so that compensated signals I"=AQ+BI and Q"=AI-BQ, where A is a constant, can be determined. When an RF carrier modulated by I", Q" is passed through the distorting amplifier the amplifier induced distortion is cancelled. Substantial reduction in bit error probability is obtained. The method can also be used for post-distortion correction.
摘要:
Content may be transmitted to mobile devices, in a network, using a Multimedia Broadcast Multicast Services (MBMS) multicast technique over wireless interfaces in the network. In one implementation, network elements in the network may receive feedback about the MBMS multicast transmission, where the feedback relates to a quality of the content, as received by the one or more mobile devices, or to the quality of the radio channel. The devices may determine whether to modify transmission parameters relating to the MBMS multicast transmission and may determine whether to retransmit lost data, corresponding to the content, to the mobile devices. The lost data may be retransmitted as a unicast transmission or a multicast transmission.
摘要:
A method, performed by a fixed wireless router device, may include receiving a packet from a Long Term Evolution network, where the packet is associated with a particular Long Term Evolution Quality of Service class and mapping the particular Long Term Evolution Quality of Service class to a particular Differentiated Services Core Point Quality of Service class. The method may further include assigning a Differentiated Services Core Point Quality of Service class to the packet based on the particular Differentiated Services Core Point Quality of Service class and forwarding the packet to particular device associated with a customer premises network serviced by the fixed wireless router device, based on a priority associated with the assigned Differentiated Services Core Point Quality of Service class.
摘要:
A device monitors temperature readings from a sensor associated with an outdoor broadband unit. When the temperature readings increase above a stored threshold value, the device sends, to a device at a core network, an alert signal that invokes, at the core network, an emergency profile associated with the outdoor broadband unit. When the temperature readings decrease below the stored threshold value, the device sends, to the device at the core network, a normal signal that invokes, at the core network, a default profile associated with the outdoor broadband unit.
摘要:
A visual indicator, such as a light emitting diode (LED), may display the quality of the radio frequency (RF) link. In one implementation, a device may include, a RF antenna; a control module to connect to a Long-Term Evolution (LTE) network through the RF antenna; and a LED, disposed on an outer surface of the device, to emit light of a number of different colors, where the color to emit is selected based on a quality of the connection to the LTE network. The device may include an outdoor broadband unit connected to an external portion of a customer premise.
摘要:
Content may be transmitted to mobile devices, in a network, using a Multimedia Broadcast Multicast Services (MBMS) multicast technique over wireless interfaces in the network. In one implementation, network elements in the network may receive feedback about the MBMS multicast transmission, where the feedback relates to a quality of the content, as received by the one or more mobile devices, or to the quality of the radio channel. The devices may determine whether to modify transmission parameters relating to the MBMS multicast transmission and may determine whether to retransmit lost data, corresponding to the content, to the mobile devices. The lost data may be retransmitted as a unicast transmission or a multicast transmission.
摘要:
A device receives, from a mobile device, a request to connect to a network, and determines, based on the connection request, whether the mobile device has mobility capability. The device registers the mobile device per host-based mobility protocol standards when the mobile device does not have mobility capability. The device registers the mobile device per network-based mobility protocol standards when the mobile device has mobility capability.