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6658043 |
Method and apparatus for providing multiple spread spectrum clock generator circuits with overlapping output frequencies
A multiple output spread spectrum clock circuit is provided that reduces electromagnetic emissions when two different clocks operate at frequencies which overlap one another. Two such clock...
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6654404 |
System, apparatus, and method for outputting pseudorandom noise sequences, and data recording medium
A system for outputting pseudorandom noise sequences comprises a plurality of output apparatuses. Each of the apparatuses comprise a natural number obtainer for obtaining a natural number p, a...
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6654405 |
Methods and apparatus for use in performing dot product operations for spread spectrum communications
A processing apparatus for use in spread spectrum communications includes a controller, a filter programmed in the controller, and a dot product hardware unit external from the controller having...
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6650686 |
Spread spectrum communication system and handover method therein
A spread spectrum communication system includes at least one mobile station and a plurality of base stations for communicating with mobile stations in sites thereof by a spread spectrum scheme....
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6647051 |
Zero delay mask for galois LFSR
A method and apparatus for the creation and use of a recursive system that generates an output that depends upon a plurality of previous outputs by first processing previous outputs to obtain...
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6647052 |
Advanced spread spectrum clock generation technique for EMI reduction of multiple clock sources
The present invention describes a method and apparatus for reducing EMI emission in a multi source electronic system. The phase of the modulated waveform is varied to minimize the number of clocks...
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6643317 |
Digital spread spectrum circuit
A digital spread spectrum system provides a simple, digital device and method for reducing electromagnetic interference even where a clock signal to the device is rapidly turned on and off. A...
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6639934 |
Power control in a CDMA mobile communication system
A transmission power control method and system are provided for use in a spread spectrum or CDMA mobile communications system, whereby an estimate of the achieved SIR is used as an additional...
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6639935 |
Out of channel cyclic redundancy code method for a discrete multitone spread spectrum communications system
A new method makes the most efficient use of the scarce spectral bandwidth in a wireless discrete multitone spread spectrum communications system. Each remote station and each base station in the...
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6639937 |
Method and apparatus for producing spread-coded signals
Transmission data that will be transmitted is coded and thus band-spread using a spread code. The band-spread transmission data is also coded using a scrambling code. The scrambling process is...
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6639936 |
Pre-data power control common packet channel
A base station (BS) and a plurality of remote stations in a code-division-multiple access (CDMA) system employ spread-spectrum communication. The base station has a BS-spread-spectrum transmitter...
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6636553 |
Pseudorandom noise generator for WCDMA
A circuit is designed with a plurality of logic circuits ( 370-374 ) for producing an offset state matrix. The circuit includes a first logic circuit ( 380-383 ) coupled to receive N elements of a...
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6636549 |
Method for calculating phase shift coefficients of an M sequence
An n-bit binary value corresponding to an amount of phase shift d is assigned to an SREG, and a shift operation is performed. An n-bit vector value corresponding to a decimal value “1” is...
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6636552 |
Sequence hopping for combinations of pseudo-random noise sequences
Provided is a method and an apparatus for pseudo-random noise (PN) code sequence hopping, in which an output PN code sequence is generated by generating and combining several intermediate PN code...
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6636551 |
ADDITIONAL INFORMATION TRANSMISSION METHOD, ADDITIONAL INFORMATION TRANSMISSION SYSTEM, INFORMATION SIGNAL OUTPUT APPARATUS, INFORMATION SIGNAL PROCESSING APPARATUS, INFORMATION SIGNAL RECORDING APPARATUS AND INFORMATION SIGNAL RECORDING MEDIUM
An additional information transmission method for transmitting an information signal and additional information in the form of an electronic watermark. The electronic watermark information is...
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6636550 |
Bi-directional transmitter/receiver system and bi-directional transmitter/receiver
To ensure establishment of synchronization and data demodulation among a number of transmitter/receivers using a spread spectrum method. Specifically, in a normal communication state, a second...
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6631158 |
Method for updating linear feedback shift register of code generator
The invention relates to method and code generator for updating linear feedback shift register (LFSR). The method comprises defining jumps corresponding to different powers of two for shifting from...
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6628173 |
Data and clock extractor with improved linearity
Phase-locked-loop based data and clock extraction comprising a phase detector that generates up and down pulses. Down pulses are maintained in width approximately equal to 1.5 unit intervals of a...
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6625202 |
Mobile station for spread spectrum communication
A mobile station for preventing reduction of the line quality when it is used near the head of a human operator. Plural antennas are arranged so that the cross-correlation of the received waves...
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6625136 |
Spreader for multiple data rates
The present invention relates to spreading data of a plurality of digital communication channels having different data rates with code sequences having different lengths. The inventive circuit...
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6621852 |
Spread spectrum wireless communication system
A wireless communication system employing spread-spectrum communication techniques includes a plurality of base stations that may be coupled directly or indirectly to a telephone network, and may...
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6621851 |
Priority messaging method for 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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6621854 |
Spread-spectrum electromagnetic signals
An assembly of simultaneously transmitted electrically generated signals is disclosed, which contains a subset of binary spreading-code sequences that are members of a larger set of binary...
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6618427 |
Spread spectrum communication system and base station thereof
A spread spectrum communication system includes a plurality of cells which share common frequencies. Each base station managing each cell includes transmitters for transmitting a reception load...
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6614834 |
Communication arrangement and method with fast tracking receiver for spread spectrum signals
A fast-tracking discrimination approach provides rapid acquisition useful for direct-sequence spread spectrum applications. In one example embodiment, the present invention is directed to a...
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6611494 |
Orthogonal sequence generator
A set of orthogonal sequences (e.g., Hadamard sequences) is decomposed into a set of basis vectors and sets of coefficients, where each set of coefficients represents a particular “vector...
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6611548 |
Multipath processor
A multipath processor processes a plurality of groups of spread-spectrum signals. Each group has a plurality of spread-spectrum signals. A first plurality of spread-spectrum signals is despread...
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6606342 |
Sequence hopping for a pseudo-random noise sequence
Provided is a method and apparatus for pseudo-random noise (PN) code sequence hopping by storing a base state of a PN code sequence generator that generates a PN code sequence and by identifying a...
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6603773 |
Method and system for controlling the transmission power of certain parts of a radio transmission
A data transmission system comprises a first device and a second device and a duplex data transmission connection therebetween. The first device sends to the second device user data on a data...
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6603798 |
User equipment employing a time division duplex technique
Outer loop/weighted open loop power control apparatus controls transmission power levels in a spread spectrum time division duplex communication user equipment (UE). The user equipment receives a...
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6603796 |
Radio communication system and transmission and/or reception apparatus for use in the system
A radio communication system includes a transmission apparatus and a reception apparatus, enabling to retransmit a frame which has caused a code error in the CDMA method, without lowering the...
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6603801 |
Spread spectrum transceiver for use in wireless local area network and having multipath mitigation
A method and spread spectrum transceiver for demodulating a spread spectrum signal is disclosed. A spread spectrum phase shift keyed (PSK) modulated information signal is received within a...
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6600773 |
Method for outer loop/weighted open loop power control apparatus employed by a base station
Outer loop/weighted open loop power control method controls transmission power levels in a spread spectrum time division duplex communication base station. The base station receives a communication...
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6600771 |
Spread spectrum phase modulation for suppression of electromagnetic interference in parallel data channels
A new spread spectrum phase modulation (SSPM) technique is applicable to both data and clock signals. The SSPM technique is more suitable to board level designs than the direct-sequence spread...
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6597724 |
User equipment method employing a time division duplex technique
An outer loop/weighted open loop power control method controls transmission power levels in a spread spectrum time division duplex communication user equipment (UE). The user equipment receives a...
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6597282 |
Spread spectrum transmission system
An inexpensive spread spectrum transmission system prevents the infiltration of external noise and external leakage of spread spectrum signals by separating electrical power for load devices from...
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6594505 |
Mobile telephone system capable of coping with a variety of mobile radio telephone systems by a single mobile radio telephone
A mobile telephone system is capable of coping with a number of different mobile radio telephone systems by a single mobile radio telephone. When a mobile radio telephone exists inside a...
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6594303 |
Coherent demodulator for use in the presence of phase discontinuities
Techniques for coherent demodulation in the presence of phase discontinuities is described. In the exemplary embodiment, times when phase discontinuities occur are known apriori by a receiver in...
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6590927 |
Method of employing weighted open loop power control for a user equipment
A method of the employing weighted open loop power control in a user equipment (UE) is initiated by the UE receiving a communication and measuring its received power level. Based on, in part, the...
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6584138 |
Coding process for inserting an inaudible data signal into an audio signal, decoding process, coder and decoder
In a coding method and a coder for introducing a non-audible data signal into an audio signal, the audio signal is first transformed to a spectral range and the masking threshold of the audio...
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6580745 |
Spread spectrum communication system and overload control method therefor
In an overload control method for a spread spectrum communication system, when the number of mobile stations communicating with a base station is equal to or more than a predetermined number, the...
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6580705 |
Signal combining scheme for wireless transmission systems having multiple modulation schemes
In a wireless transmission system that transmits the same information in parallel using two or more different types of modulation schemes, such as a satellite-based digital audio transmission...
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6580747 |
Method and generator for generating orthogonal spreading code in CDMA radio system
The invention relates to a method and a generator for generating a short orthogonal spreading code in CDMA radio system. The method includes obtaining control data the length, the running number...
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6577669 |
Base station utilizing a weighted open loop power control
A base station employing weighted open loop power control receives a communication and measures its received power level. Based on, in part, the received communication's power level and the...
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6577686 |
Receiver
The invention aims at adaptive array diversity reception of high convergence speed of combined weight by a simple signal processing, in a receiver by time division transmission system. Signals...
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6574205 |
CDMA cellular system and method of detecting spreading code in CDMA cellular system
A CDMA cellular system does not require accurate synchronization between all base stations and is capable of distinguishing the base stations from each other without the need for a complex process....
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6574265 |
CDMA communication system using an antenna array
The invention provides for transmission and reception of a data signal using a plurality of transmitting antennas. Each antenna transmits a different reference signal having a pseudo random chip...
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6570907 |
Simplified finite impulse response (FIR) digital filter for direct sequencespread spectrum communication
A spread spectrum modulated signal generator is disclosed that reduces the storage requirement for storing values representing filter responses of input signal samples in a digital filter by taking...
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6567458 |
Wireless communication system utilizing frequency hopping method and control method therefor
In a wireless communication system capable of communication with a frequency hopping method, if predetermined control information is received from a third wireless communication device while a...
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6567390 |
Accelerated message decoding
A message that has its energy spread over a frame of encoded data is decoded. First, encoded data are received so as to obtain a quantity of the encoded data that is less than all the encoded data...
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