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7490182 |
Switching control circuit provided with serial to parallel converter and storage unit, and radio communication apparatus using the same
A switching control circuit includes a serial-to-parallel converter, a rewritable storage device, and a decoder. The serial-to-parallel converter performs serial-to-parallel conversion for...
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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...
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7460513 |
Encapsulation of diverse protocols over internal interface of distributed radio base station
A radio base station ( 20 ) has an internal interface ( 26 ) which connects a radio equipment ( 22 ) and a radio equipment controller ( 24 ). At least one and preferably both of the example radio...
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7450530 |
Cross link multiplexer bus configured to reduce cross-talk
A cross link multiplexer bus comprising a plurality of cross link multiplexers and a plurality of interconnects. The plurality of cross link multiplexers has a destination port configured to...
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7450529 |
Cross link multiplexer bus
A cross link multiplexer bus comprising a plurality of cross link multiplexers and a plurality of interconnects. The plurality of cross link multiplexers has a destination port configured to...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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....
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5943315 |
Multiplex transmission system and abnormality processing controlling method and apparatus used therefor
A multiplex transmission system includes a multiplex transmission network through which normality and abnormality processing control specification information (PCSI) for loads are transmitted. A...
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5889766 |
Transmission/reception method based on frequency division multiple access having changeable communication channel bandwidths and communication apparatus employing the method
An FDMA (Frequency-Division Multiple Access) transmitter-receiver for use in an FDMA communication system which is capable of changing a bandwidth of a channel as required. The FDMA...
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5715242 |
System for integrated distribution of switched voice and television on coaxial cable with phase distortion correction
A system for voice distribution amongst a plurality of telephone subscriber locations operating on a broadband cable network wherein RF transmitting and RF receiving channels for carrying voice and...
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5710763 |
Filtered fast Fourier transmultiplexer and method
A filter fast Fourier transmultiplexer divides a multi-channel communication signal into single channel communication signals through a cascade of filters and mixers. The output sample rate is...
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5625624 |
High data rate satellite communication system
A satellite-based communication system providing high rate transfer of data between linked terminals. The system comprises a plurality of user terminals (VSAT's) that are linked by and that...
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5608724 |
Dynamically reconfigurable frequency division multiplexer and modulator
A dynamically reconfigurable frequency division multiplexer and modulator accepts multiple input signals, each of which is individually time division multiplexed. Each input signal is used to...
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5590173 |
Delay insensitive base station-to-handset interface for radio telephone systems
A cordless telephone system, employs a remote antenna driver for converting TDD receive signals, broadcast from a cordless handset operating in a TDD (time division duplex) mode, to FDD (frequency...
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5546051 |
Power amplifier and power amplification method
In a dual-mode radio telephone transmitter operative in both an analog modulation mode based on the FDMA system and a digital modulation mode based on the TDMA system, a DC bias voltage Vdd to be...
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5430722 |
Hybrid photonic-electronic subscriber access unit for connecting optical subscriber lines to an asynchronous transfer mode telecommunication network
This subscriber access unit includes an electronic subscriber line interface circuit (1) whose functions include: cell header translation, routing label addition and bit rate control (policing). It...
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5406553 |
Apparatus and method for converting a frequency division multiplex to a time division multiplex
Apparatus for converting a frequency division multiplex (fdm) signal to a time domain multiplex (tdm) signal in which a voltage control oscillator whose output is a staircase of reference...
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5396489 |
Method and means for transmultiplexing signals between signal terminals and radio frequency channels
A method and apparatus are provided of transmultiplexing a plurality of signals between a plurality of signal terminals (17 or 29) and a plurality of selected radio frequency channels. The method...
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5274627 |
Non-regenerative multibeam satellite communications system with FDMA access and SSTDM connectivity
An apparatus and method for a non regenerative multibeam communications system with FDMA access and SSTDM connectivity. In accordance with the present invention, FDM input signals are transformed...
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5226038 |
Method for converting and method for processing electronic multiplex signals, and apparatus for processing such signals
A method and apparatus for converting electronic signals from frequency-division multiplex format into time-division multiplex format while retaining substantially all phase and amplitude...
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5038344 |
FDM-TDM transforming device
Received FDM (Frequency Division Multiplex) SCPC (Single Channel Per Carrier) signals are usually converted into intermediate frequency band signals and then transformed into TDM (Time Division...
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5038342 |
TDM/FDM communication system supporting both TDM and FDM-only communication units
An RF communications system that can determine when a requesting subscriber unit comprises a TDM capable unit, and when it doesn't. Channel assignments are based upon this determination. The system...
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4928272 |
Two-way CATV system using frequency division multiplexing
A two-way CATV system, in which a plurality of communication channels are set simultaneously in an upstream communication line between a plurality of end terminal equipment and a center equipment...
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4922483 |
Multi-channel PCM music broadcasting system
In multi-channel PCM music broadcasting system, a plurality of blocks are time division multiplexed, each block having at least one music channel for a PCM formatted music signal and having an...
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4901310 |
Mobile satellite communication system
A satellite communication system includes a plurality of mobile stations which are situated on the earth and a communication satellite which is communicable with the mobile stations by radio...
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4813035 |
Transmultiplexer virtual group distribution frame
A transmultiplexer for use in a telephone system is disclosed. The transmultiplexer includes a programmable virtual distribution frame feature which provides for information traffic to be switched...
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4796253 |
Time base converter employing two reference position phase lock loop
A time base converter employs a two position, phase lock loop (40) to write twice orthogonally spaced signals into a split phase memory (34), which in turn can be read out at the timing rate of an...
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4759013 |
FDM-TDM transmultiplexing system
An FDM-TDM transmultiplexing system for a modulation/demodulation device which is applicable to a regenerative repeating system of a satellite or a ground radio communication system is disclosed...
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4754449 |
Wide bandwidth device for demodulating frequency division multiplexed signals
A device for transforming N-Frequency Division Multiplexed (FDM) channels (21) of modulated signals into individually accessible streams (46) of demodulated data employs a Fourier transform...
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4752925 |
Two-hop collocated satellite communications system
A two-hop communications system utilizing two collocated spacecraft (Se and Sw) and two remote intersatellite exchange (RISE) means (Re and Rw) provides for communications between ground stations...
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4747095 |
Saw demodulator employing corrective feedback timing
An analog surface acoustic wave demodulator includes a calibration section (10) for compensating for distortions, a calibrated frequency sweep (20), a pair of dispersion sections formed by...
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4719619 |
Synchronizer for communications processor
A signal processor (11), such as a spectrum analyzer or SAW demodulator, defines a signal stream from a frequency division multiplexed (FDM) input (13) to a time division multiplexed (TDM) output...
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4715029 |
FDMA communications channel synchronizer
A synchronizer (10) for frequency division multiple access signals (FDMA) permits synchronization on board a communications satellite without feedback to a multitude of ground-based user stations....
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4704715 |
Information communication system
In this information transmission system, a PCM encoder is provided for time-division multiplexing multichannel audio signals and a digital character information signal to generate a time-division...
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4598398 |
Test apparatus for PCM/FDM transmultiplexer
A device is described which utilizes an addressing circuit to output, from a memory device, stored digital samples of an analog sinusoid, in logarithmic form, to a level control circuit, which...
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4590595 |
Apparatus for detecting in-band single frequency signaling tones from FDM channels
A time-division multiplexed (TDM) signal carrying speech information and in-band single frequency signaling tones is simultaneously applied to a digital band-pass filter and a digital...
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4578790 |
System and equipment for single side band multiplexing through digital processing
The system and equipment according to the invention carry out the (SSB) frequency multiplexing and demultiplexing of N base band sampled signals by purely digital processing. On the multiplexing...
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4513315 |
Community antenna television arrangement for the reception and distribution of TV - and digital audio signals
Community antenna television arrangement for the reception and distribution of TV signals and digital audio signals, in particular signals which are transmitted per satellite, including a head-end...
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4510598 |
Digital transmultiplexer
A system for the digital conversion of a time division multiplex signal into a frequency division multiplex signal wherein the signals of the individual time multiplex channels are filtered by...
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