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6553056 |
CDMA receiver with a reduced number of required high speed adders
A CDMA receiver with a reduced number of high speed adders is provided, wherein integration for one symbol period is performed for each value of spreading code corresponding to a particular user...
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6549583 |
Optimum phase error metric for OFDM pilot tone tracking in wireless LAN
A method and apparatus of pilot phase error estimation in an orthogonal frequency division multiplexed (OFDM) receiver including the steps of: determining pilot reference points corresponding to a...
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6549784 |
Method and apparatus for implementing measurement based dynamic frequency hopping in wireless communication systems
Proposed is a method and apparatus for reducing interference in a frequency hopping wireless communications system. In one embodiment of the present invention, a base station and a terminal station...
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6549757 |
Method and system for assessing, at reception level, the quality of a digital signal, such as a digital audio/video signal
The invention concerns a method and a system for assessing the quality of a broadcast digital signal. A reference signal (sref) is generated ( 1001 ) from an initial signal (so) and jointly...
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6546041 |
Radio transmission method and apparatus for digital information
A baseband digital IQ signal modulated by digital information and a spread spectrum IQ code sequence whose auto-correlation side lobe is equal to zero are frame-synthesized with each other to...
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6542536 |
Spread spectrum communications with selectable data transfer rates
A spread spectrum communications system that is operable to provide user-selectable data transfer rates comprises a user station for generating an access request and a gateway server for receiving...
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6539008 |
Method for inserting power control bits in the CDMA mobile system
A power control bit inserting method between a base station and a terminal. The base station and the terminal each use a plurality of adjacent frequency bands as signal paths with independent...
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6535495 |
Radio communication system with multiple and simultaneous encoding technique
A method of operating a radio communication system uses a Code Division Multiple Access (CDMA) technique. Multiple scrambling codes may be used in a single cell to alleviate the shortage of...
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6535546 |
Method and apparatus for determining characteristics of components of a communication channel under load
For determining characteristics of components of a communication channel, for example of a transponder in a communication satellite, a clean carrier signal f(t) is modulated with a pseudo noise...
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6532249 |
Transmitter of multiple frequency radio communication system
A transmitter for a multiple frequency radio communication system provides a capability for filtering spread spectrum signals of a multiple frequency system by using one lowpass filter, and...
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6529120 |
System for communicating over a transmission line
A system for communicating over a transmission line has a plurality of transceivers, each for generating an information signal for transmission over the transmission line and for reception of an...
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6526031 |
Forward power control determination in spread spectrum communications systems
A spread spectrum communications system where power control mitigates received signal fluctuations. An implementation is described for forward power control wherein received data is checked for...
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6522243 |
Geometric harmonic modulation signaling and detection
A communication system includes a transmitter configured to pulse shape a GHM signal to confine the frequency spectrum of the GHM signal within a predefined frequency range. A receiver is also...
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6522686 |
Receiving apparatus of spectrum spread communication system
A receiving apparatus of spectrum spread communication system, which has optimum detection characteristics for receiving signals irrespectively of various fading pitches in fading environment, is...
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6519237 |
Apparatus and method for parallel searching and correlating for CDMA system
A method to expediently perform search/correlation operation between an internal pilot pseudonoise (PN) sequence and an incoming pilot PN sequence. This operation is used to acquire base stations...
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6519292 |
Transmission method, transmitter and receiver
A transmission method and apparatus which perform communication without interfering with other types of communication is provided. A transmission symbol stream is generated by applying...
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6512474 |
Ultra wideband signal source
A method and system to create an ultra wideband (UWB) signal are disclosed. The UWB signal comprises a carrier frequency with each cycle reversing in phase. The UWB signal is generated from a...
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6510171 |
Multi-link wire hopping over copper pairs
A system and method for transmitting a signal from a telephone terminal to a central office. The telephone terminal and central office are connected to aggregation points. The aggregation points...
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6510172 |
Multi-user communication system architecture with distributed transmitters
A new signal processing architecture for base stations and gateways ( 124, 126 ) used in spread spectrum communication systems ( 100 ) that simplifies data transfer, reduces required bus capacity,...
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6496531 |
Method and system for controlling forward transmit power in a wireless system
A method and system for controlling down link transmit power during a soft hand-off in a spread-spectrum wireless system supports independent power control of multiple forward channels to reduce...
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6493376 |
Multi-layered PN code spreading in a multi-user communications system
A technique for spreading information signals in a spread spectrum communication system to provide increased signal acquisition speed. A first PN spreading code or code set is used to spread...
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6493380 |
System and method for estimating signal time of arrival
A method for estimating a time delay including the steps of first, estimating a channel spectrum from a received signal and a known reference signal, second, extracting a virtual array structure...
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6493377 |
Distributed network, spread-spectrum system
A distributed network, spread-spectrum system comprising a plurality of remote stations and a plurality of nodes. One or more hub node(s) connect(s) to a central telephone office. A node's...
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6490329 |
Device and method for generating clock signals from a single reference frequency signal and for synchronizing data signals with a generated clock
An integrated circuit device including a FIFO and a clock generator having a pulse swallower. The pulse swallower eliminates pulses from a reference frequency signal, producing a primary digital...
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6490313 |
System and method for PN offset index planning in a digital CDMA cellular network
A system optimally assigns pseudo-noise (PN) offsets in a cellular network that includes several sectors. The system sets parameters for the cellular network, determines potential interference...
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6483865 |
Wireless interface for electronic devices located in enclosed spaces
A wireless communication system for transmitting and receiving radio frequency (RF) signals inside an enclosure such as a hull of a torpedo, autonomous underwater vehicle, or aircraft, an...
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6483821 |
CDMA mobile communications system and method with improved channel estimation and pilot symbol transmission
The present invention is an improved system and method for transmitting and receiving digital information over mobile communication channels. The present invention includes an enhanced channel...
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6480521 |
Method and apparatus for transmitting high speed data in a spread spectrum communications system
The present invention is a novel and improved method and apparatus for transmitting high speed digital data in a spread spectrum communications system. In particular, the present invention provides...
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6480522 |
Method of polling second stations for functional quality and maintenance data in a discrete multitone spread spectrum communications system
A discrete multitone stacked-carrier spread spectrum communication method is based on frequency domain spreading including multiplication of a baseband signal by a set of superimposed, or stacked,...
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6477154 |
Microcellular mobile communication system
A microcelluar mobile communication system which performs various functions such as a centralized management of resources, a capacity increase, a Base Station Transceiver System(BTS)...
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6473448 |
Spread spectrum signal generation method, spread spectrum signal generator, stream encryption method, and stream enciphered codes communication method
Arithmetic operation is started by substituting an initial value x(0) for a logistic mapping x(t+1)=4x(t){1x(t)} which is a symmetrical nonlinear mapping. The resultant value is again input into...
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6473449 |
High-data-rate wireless local-area network
An apparatus and method for communicating data between at least two data devices, suitable for use as a wireless local-area network, that provides robust data communication via a radio...
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6473453 |
High data rate multiplexed multichannel high frequency broadcast system
A high frequency communications system comprises eight multiplexed ( 112 ) spread spectrum channels with data in each channel transmitted using, for example, 32 semi-orthogonal codes to enable 5...
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6473447 |
Dynamic sectorization in a spread spectrum communication system
A system and method for dynamically varying traffic channel sectorization within a spread spectrum communication system is disclosed herein. In a preferred implementation, the system is operative...
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6470137 |
Method and apparatus for superimposing a level changed spectrum spread additional information signal on a video signal
Visual influence on the reproduced image by the spectrum spread additional information signal can be controlled on the reproduced image by sequentially changing the level of the spectrum spread...
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6470044 |
Computationally parsimonious forward link receiver for DS-CDMA systems and method for same
A receiver has been provided, with a pre-whitening filter, to improve the probability of recovering a received signal in the presence of colored noise. Colored noise can be multipath or...
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6466606 |
Method and apparatus for performing search acquisition in a multi-carrier communication system
A method and apparatus to search for a traffic channel in a multi-carrier spread spectrum communication network. In this first embodiment, all three pilot signals are transmitted with equal power...
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6459726 |
Backscatter interrogators, communication systems and backscatter communication methods
The present invention provides backscatter interrogators, communication systems and backscatter communication methods. According to one aspect of the present invention, a backscatter interrogator...
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6459721 |
Spread spectrum receiving apparatus
A receiving apparatus includes a base-band conversion circuit, a synchronizing circuit/code generator and a demodulator. The base-band conversion circuit converts a received signal into a base-band...
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6459402 |
Method for measuring distance and position using spectrum signal, and an equipment using the method
Under a multi-path environment, the receive timing for an incoming wave of the minimum propagation delay time cannot be accurately measured in the prior art. By using the delay profile created by...
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6456644 |
Bandpass correlation of a spread spectrum signal
A spread spectrum signal is processed after it is sampled at a selected sampling rate and tuned to a center frequency lower than the sampling rate and greater than zero. The signal is multiplied...
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6456672 |
Automatic frequency control communication system
In a communication system using the time diversity transmission scheme, the communication system provided with the stable automatic frequency control circuit with the wide frequency pull-in range...
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6456652 |
Method for optimizing forward link coverage in code division multiple access (CDMA) network
Disclosed is a method for optimizing forward link coverage in a spread spectrum communication system, e.g., CDMA system. Spread spectrum test communication signals are transmitted from a base...
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6452959 |
Method of and apparatus for generating data sequences for use in communications
A method of generating one or more pseudorandom noise (PN) sequences for use in spread spectrum communications includes the steps of providing data at an input of memory which stores bits...
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6452960 |
Audio data transmission apparatus and method, audio data recording apparatus, and audio data recording medium
An audio data transmission and recording system and a recording medium according to the system. Gaps in the audio data are used to control the addition of spectrum-diffused data to the audio data....
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6449303 |
System and method for peak power reduction in multiple carrier communications systems
A system and method for signal peak reduction in a multiple carrier communication system where the individual carriers are produced from input symbols that are filtered to reduce individual carrier...
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6445725 |
Spread spectrum communication apparatus
A spread spectrum communication apparatus for communicating through a plurality of communication channels corresponding to a plurality of diffusion codes comprises a selector to select the number...
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6442155 |
Device and method for controlling transmission power of a mobile station in a multi-carrier CDMA mobile communication system
A device for controlling transmission power of a mobile station in a multi-carrier CDMA mobile communication system, which includes a digital mixer that receives and divides a wide band...
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6442188 |
Phase locked loop
A method includes locking onto a spread spectrum clock signal to minimize a phase error between an output clock signal and the spread spectrum clock signal. The spread spectrum clock signal has a...
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6438155 |
Decoding chip streams
A method and apparatus are described for decoding a stream of data which has been encoded into a chip stream so that a chip rate and phase of the chip stream can be derived from the encoded data....
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