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| Number | Title | Issue Date |
| 7675876 | Transport demultiplexor with bit maskable filter The preferred embodiment of the present invention provides an improved transport demultiplexor that can receive and filter different data types before sending the data to system memory. The preferred embodiment provides a string comparator to facilitate real time fi... | 03/09/2010 |
| 7474635 | Communication system and method using time division multiplexed (TDM) downlink A technique for reducing power requirements in a communication transponder by converting signals in multiple uplink channels carried in frequency division multiplexed (FDM) form on multiple uplink beams, to a lesser number of downlink beams that operate in time divi... | 01/06/2009 |
| 7430254 | Matched detector/channelizer with adaptive threshold A method of detecting a signal in an input channel of a receiver includes applying each of a plurality of pre-detection bandwidths to an input signal. The method can include deriving, in a cascaded fashion, a plurality of pre-detection bandwidths for the input chann... | 09/30/2008 |
| 7355964 | Systems for contention-based bandwidth requests in orthogonal frequency division multiplexing systems Systems for contention-based bandwidth requests in orthogonal frequency division multiplexing (OFDM) systems are provided. In one embodiment, a bi-directional communication system comprises: a multipoint-to-point host unit; and a plurality of remote units communicat... | 04/08/2008 |
| 7356019 | Method and apparatus for converting optical signals to radio channels The invention relates to a conversion of a pulse modulated signal to a radio frequency signal enabling use of applications and protocols designed for wireless optical links on radio frequency channels. The method comprises receiving the pulse modulated input signal,... | 04/08/2008 |
| 7330707 | Hetrodyne receiver and IC In a heterodyne receiver, the effect of an image interference signal that occurs in a case where a low intermediate frequency is used is alleviated. Circuits (12I), (12Q), (13I), (13Q), and (14) are provided to switch a heterodyne ... | 02/12/2008 |
| 7324543 | Method for protecting against overload in a mobile communication network Method for protecting against overload of a multipoint-to-point channel of a mobile communication network, said multipoint-to-point channel being provided by a radio access network for the mobile communication network in order to enable a plurality of mobile communi... | 01/29/2008 |
| 7289566 | Cable modem tuner An IF signal output from an IF amplifying circuit included in a tuner is converted to have a band width for transmission by an SAW filter and has unnecessary signals removed therefrom. Thereafter, the resulting signal has its gain made constant by an IFAGC circuit, ... | 10/30/2007 |
| 7274712 | System and method of operating the system that responds to channel change requests without causing macro-blocking A router stores a value that indicates the maximum number of channels that can be output to a group, and the number of channels that are output to the group. When a member of the group indicates a channel change selection from a first channel to a second channel, th... | 09/25/2007 |
| 7251378 | Method for detecting image interpolation A method for analyzing a digital image channel comprising the steps of providing a digital image channel, extracting a signal from the digital image channel, and using the extracted signal to determine whether the digital image channel is an interpolated digital ima... | 07/31/2007 |
| 7242732 | Carrier based backwards compatible data networking transmitter, receiver, and signal format New version packet data devices support a backwards-compatible signal format. New version devices operate within a first frequency band while old version devices operate within a second frequency band. The first frequency band differs from but overlaps with the seco... | 07/10/2007 |
| 7236804 | Method of supporting voice-band modem-to-modem calls in a wireless communication system A method of supporting voice-band modem-to-modem calls in a wireless communication system is disclosed. In some embodiments, once a modem call is detected, the modem call is terminated. Data in the terminated modem call is then demodulated and relayed from one end o... | 06/26/2007 |
| 7158723 | Channel identification in communications networks Channels in an optical WDM network are each identified by at least two dither tones with which the channel is modulated, the dither tones alternating with a predetermined periodicity so that at any instant each channel is modulated by only one dither tone. The dithe... | 01/02/2007 |
| 7154914 | Through-timing of data transmitted across an optical communications system utilizing frequency division multiplexing Data is transmitted across an optical fiber communications system by splitting an incoming tributary into multiple low-speed data channels, modulating each of these into a stream of symbols (e.g., by using QAM modulation) and then frequency division multiplexing a n... | 12/26/2006 |
| 7155122 | Channel identification in communications networks Channels in an optical WDM network are each identified by at least two dither tones with which the channel is modulated, the dither tones alternating with a predetermined periodicity so that at any instant each channel is modulated by only one dither tone. The dithe... | 12/26/2006 |
| 7145965 | Digital demodulator for terrestrial receiver A method and a demodulator for processing a Fast Fourier Transform using data blocks include a Fast Fourier Transform (FFT) coprocessor and a digital signal processor (DSP). The FFT coprocessor includes a start function and a computation function (F_FFT). The start ... | 12/05/2006 |
| 7142619 | Long subscriber loops using automatic gain control mid-span extender unit Systems and methods are described for long subscriber loops using automatic gain control. A method includes extending a digital subscriber loop including: producing an output signal in a first direction from a variable gain amplifier at a mid-span extender unit resp... | 11/28/2006 |
| 7130283 | Variable bandwidth satellite communication techniques Multiple bandwidth requestors (220), a bandwidth manager (420) and a forward link (410) from the bandwidth manager to the bandwidth requestors are used to allocate bandwidth in a return link beam (210). The uplink bandwidth allocation is ... | 10/31/2006 |
| 7123592 | Dynamic allocation of transmission bandwidth in a communication system A head end is provided. The head end includes at least one modern for communicating with service units over a transmission bandwidth, the transmission bandwidth being divided into a number of subbands, each subband including a plurality of payload channels and at le... | 10/17/2006 |
| 7068730 | Wideband multi-channel quadrature amplitude modulation of cable television signals Wideband, direct-to-RF multi channel QAM modulation is described whereby IFFT processing is employed to modulate a plurality of encoded symbol streams in parallel onto a like plurality of uniformly spaced carriers. A high-frequency master clock and high-performance,... | 06/27/2006 |
| 7068774 | Integrated acd and ivr scripting for call center tracking of calls A method of tracking calls received within a call center is disclosed. A call is received within a call center switch that is connected to a call center via a host interface link (HIL). The call center has an automatic call distributor (ACD) server and interactive v... | 06/27/2006 |
| 7062336 | Time-division method for playing multi-channel voice signals A time-division method for playing multi-channel voice signals is provided to improve voice qualities of the multi-channel voice signals. The first feature of the present invention is that after time-division sampling, the voice signals can be directly sent to a sub... | 06/13/2006 |
| 7058150 | High-speed serial data transceiver and related methods A high-speed serial data transceiver includes multiple receivers and transmitters for receiving and transmitting multiple analog, serial data signals at multi-gigabit-per-second data rates. Each receiver includes a timing recovery system for tracking a phase and a f... | 06/06/2006 |
| 7054556 | Channel identification in communications networks Channels in an optical WDM network are each identified by at least two dither tones with which the channel is modulated, the dither tones alternating with a predetermined periodicity so that at any instant each channel is modulated by only one dither tone. The dithe... | 05/30/2006 |
| 7031272 | Satellite direct radio broadcast system A satellite direct audio broadcast system includes a plurality of fixed-rate, uniform, frequency division multiple access (“FDMA”) uplinks and a time division multiplexed (“TDM”) downlink. Source audio channels may be divided among and transmitted through a ... | 04/18/2006 |
| 7031333 | Reduced pin count media independent interface A system and method are disclosed for providing a method of communicating between a media access control (MAC) layer and a physical (PHY) layer. The method includes sending a 100 MHz time-division multiplexed signal on a receive data line and sending a time-division... | 04/18/2006 |
| 6965593 | High bandwidth broadcast system having localized multicast access to broadcast content A method and arrangement is provided for the multicasting of streaming digital content to a plurality of Internet users. Streaming digital audio, video or other digital data content that is to be multicast to Internet users is formatted into IP protocol at a head-en... | 11/15/2005 |
| 6947500 | Buffering and sequencing of soft decisions of multiple channels into a single shared biorthogonal decoder The invention is a receiver and a method of receiving data having a preferred application in a satellite receiver in accordance with the invention includes a memory (114) including an addressable storage array which stores a sequence of data samples contained... | 09/20/2005 |
| 6940893 | High-speed indoor wireless chirp spread spectrum data link This invention modulates data onto a radio channel in such a way that the deleterious effects of the channel are reduced. This is accomplished in three steps: first, the information signal is modulated using a phase-differential modulation scheme. Second, the modula... | 09/06/2005 |
| 6904180 | Method for detecting image interpolation A method for analyzing a digital image channel comprising the steps of providing a digital image channel, extracting a signal from the digital image channel, and using the extracted signal to determine whether the digital image channel is an interpolated digital ima... | 06/07/2005 |
| 6768434 | High speed x/sine(x) correction circuit A high speed x/sine(x) correction circuit for a digital to analog converter (DAC) functions by implementing a filter with an impulse response that approximates a sine(x)/x response. Each digital data value of an input signal to be converted by the DAC is considered ... | 07/27/2004 |
| 6731690 | Methods and apparatus for transmultiplexing a multi-channel signal A transmultiplexer (202) is provided for transmultiplexing digitized signal samples (244) produced by a converter. The transmultiplexer (202) comprises a first Fourier transformer bank (304) configured to transform the digital signal samp... | 05/04/2004 |
| 6708029 | Broadband communication system for mobile users in a satellite-based network A satellite-based communications system operating at high data rates includes a plurality of satellites each having uplink and downlink antennas for transmitting and receiving a plurality of signals utilizing a plurality of spot beams to and from a plurality of cove... | 03/16/2004 |
| 6590871 | Multi-carrier modulation apparatus and transmitter using the same A multi-carrier modulation apparatus to which transmultiplexers are applied. A multiplexing signal is treated as a synthesis of a plurality of multiplexed signals which are separated by a wider interval than the multiplexing frequency interval. Signals of... | 07/08/2003 |
| 6516438 | Concatenated coding system for satellite communications The present invention provides a method for custom coding uplink signals and downlink beams in a satellite communications system. The method includes the step of applying, at a ground station (100), an outer code (102) to an uplink signal to produce an ou... | 02/04/2003 |
| 6456602 | Method and apparatus for achieving frequency diversity by use of multiple images A physical layer device (PHY) device in a home LAN employs discrete multitone technology (DMT). The DMT system enables usage of existing residential wiring, which typically is telephone system grade twisted copper pair. The PHY device comprises a spectral... | 09/24/2002 |
| 6449262 | Method and apparatus for frequency shifting with a clock signal A physical layer device (PHY) device in a home LAN employs discrete multitone technology (DMT). The DMT system enables usage of existing residential wiring, which typically is telephone system grade twisted copper pair. The PHY device comprises an analog ... | 09/10/2002 |
| 6138261 | Concatenated coding system for satellite communications The present invention provides a method for custom coding uplink signals and downlink beams in a satellite communications system. The method includes the step of applying, at a ground station (100), an outer code (102) to an uplink signal to produce an ou... | 10/24/2000 |
| 6020830 | Telemetry system using broadband correlation techniques An efficient and cost effective analog telemetry system for transmitting receiving many individual data channels over long distances is provided by having each data channel signal modulate a pseudo-random number (PRN) signal which has been delayed for a... | 02/01/2000 |
| 6009084 | Concentrating transmultiplexer for cable telephony A transmultiplexer is connected between digital facilities and analog facilities for translating information between TDM and FDM formats on the digital and analog facilities, respectively. Information in the TDM format is representative of a plurality of ... | 12/28/1999 |
