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| Number | Title | Issue Date |
| 7653119 | Extending orthogonal frequency division multiplexed wireless local area networks using direct sequence spread spectrum/complementary code keying In various embodiments, the present invention includes a method for direct spread modulating data for wireless transmission at a 5 Gigahertz band or other frequency bands via wireless devices. Such wireless transmissions may occur in a wireless network having protec... | 01/26/2010 |
| 7643535 | Compatible preparation and detection of preambles of direct sequence spread spectrum (DSSS) and narrow band signals The preambles of narrow band signals and DSSS signals are prepared for compatible detection. The preamble is encoded by encoding a sequence of identical preamble blocks with sequentially corresponding code elements of a preamble encoding sequence. Each of the identi... | 01/05/2010 |
| 7596168 | Diversity receiving apparatus, controlling method of the same, and computer-readable medium containing program therefor A diversity receiving apparatus receives first and second reception signals and is constituted by including one or more phase shifters that generate one or more third signals having phases different from the second reception signal based on the second reception sign... | 09/29/2009 |
| 7586973 | Apparatus and method for modulating data message by employing orthogonal variable spreading factor (OVSF) codes in mobile communication system A method for converting source data to a channel-modulated signal having a plurality of pairs of in-phase (I) and quadrature-phase (Q) data in a mobile station, wherein the mobile station uses at least one channel, includes the steps of: a) encoding the source data ... | 09/08/2009 |
| 7542505 | Systems and methods for signal conversion Systems and methods for signal conversion are provided. Signals are spread in a continuous spectrum by a spread spectrum signal, such as a direct sequence spread spectrum (DS-SS) signal. The signals are then processed, which may include but is not limited to analog-... | 06/02/2009 |
| 7526010 | Doped multi-rate spread spectrum composite code A composite code is made for example by exclusive-OR'ing each real element of a first constituent code A with each element of a second constituent code B to obtain a basic composite code. To suppress autocorrelation, differing numbers of doping code elements are ins... | 04/28/2009 |
| 7519101 | Method and apparatus for using empty time slots for spread spectrum encoding Communication circuitry uses a combination of Pseudo-Noise (PN) coded and non-PN coded transmission periods to represent different data values. In one embodiment, a number of data values are encoded into a smaller second number of encoded ternary values. The Pseudo-... | 04/14/2009 |
| 7502406 | Automatic power control system for a code division multiple access (CDMA) communications system A receiver receives signals and noise over a frequency spectrum of a desired received signal. The desired received signal is spread using code division multiple access. The received signals and noise are demodulated to produce a demodulated signal. The demodulated s... | 03/10/2009 |
| 7492808 | Decoding method using adaptive step-size algorithm for a space-time coded DS-CDMA system Disclosed is a method for decoding received signals on communication channels between at least one transmit antenna and plural receive antennas in a space-time coded direct sequence (DS)-CDMA communication system. The decoding method includes steps of: adjusting the... | 02/17/2009 |
| 7471714 | Random number sequence sharing system, random number sequence sharing apparatus, codec system, coding apparatus, decoding apparatus, random number sequence sharing method, coding method, decoding method, and program product In a random number sequence sharing apparatus, a reception unit receives a radio signal including a radio wave from a pre-designated radio star at a pre-designated observation time, a sending unit sends the received radio signal to another random number sequence sha... | 12/30/2008 |
| 7443906 | Apparatus and method for modulating data message by employing orthogonal variable spreading factor (OVSF) codes in mobile communication system A method for converting source data to a channel-modulated signal having a plurality of pairs of in-phase (I) and quadrature-phase (Q) data in a mobile station, wherein the mobile station uses at least one channel, includes the steps of: a) encoding the source data ... | 10/28/2008 |
| 7443907 | Base station apparatus of mobile communication system A base station including a transmitting and receiving amplifier for amplifying CDMA signals exchanged with a mobile station; a radio stage connected to the transmitting and receiving amplifier for carrying out D/A conversion of a transmitted signal that undergoes ba... | 10/28/2008 |
| 7440485 | Apparatus and method for communicating packet data control channel in a mobile communication system A base station transmission apparatus for transmitting MAC (Medium Access Control) ID (Identification) information indicating a terminal to receive transmission packet data and length information of the transmission packet data in a mobile communication system for h... | 10/21/2008 |
| 7440492 | Interference canceller for CDMA mobile stations Parallel interference cancellers are connected in successive stages. In each canceller, multiple signal paths are provided for interference replica estimators to receive multiple CDMA channels. A spread code is generated for each signal path for dispreading the path... | 10/21/2008 |
| 7429904 | Spread-spectrum radio utilizing MEMS components A spread-spectrum radio, such as a frequency-hopping spread-spectrum radio or a direct-sequence spread-spectrum radio, includes a transmitter that utilizes microelectromechanical systems (MEMS) based oscillation system to generate a spread-spectrum signal and/or a r... | 09/30/2008 |
| 7430163 | Data stream transmission preprocessing Embodiments of transmission data stream pre-processing are disclosed. A method includes receiving the data stream for transmission, forming blocks of samples from the data stream, inverse Fourier transforming the blocks of samples forming multi-carrier signal symbol... | 09/30/2008 |
| 7426175 | Method and apparatus for pilot signal transmission Pilot sequences are constructed from distinct “classes” of chirp sequences that have an optimal cross correlation property. Utilization of chirp sequences for pilot sequences results in pilot sequences that have optimal or nearly-optimal cross correlation and au... | 09/16/2008 |
| 7424046 | Spread spectrum clock signal generation system and method A system and method for generating a clock signal having spread spectrum modulation. The method involves generating a clock signal by generating edge positions for edges of the clock signal from a digital representation of a timing for each edge to impart spread spe... | 09/09/2008 |
| 7421212 | Detecting and locating pulses using a Bragg cell Detecting a pulse of a signal includes receiving the signal and a light beam. The signal drives a spatial light modulator to modulate the light beam, where the complex amplitude of the modulated light beam is proportional to the signal current. The modulated light b... | 09/02/2008 |
| 7421007 | Transmission/reception digital circuit in CDMA system The present invention relates to a digital transmitting/receiving circuit (1) intended to be mounted on at least one source and on at least one concentrator exchanging binary symbols with the said sources, the said circuit (1) comprising a transmitter ... | 09/02/2008 |
| 7418046 | Pilot transmission and channel estimation for multiple transmitters Each transmitter is assigned a time-only pilot code, a frequency-only pilot code, or a time-frequency pilot code to use for pilot transmission. The pilot codes may be pseudo-random, orthogonal, and/or cyclic-shift codes. To obtain a channel estimate for a transmitte... | 08/26/2008 |
| 7406120 | Transmission channel impulse response estimation using fast algorithms Channel impulse response estimation employs a training sequence to enable correction for multipath and other disturbances affecting a signal during transmission via a digital wireless communication channel. High-speed packet transmission rates, with a training seque... | 07/29/2008 |
| 7391804 | Spread spectrum communication method and system using diversity correlation and multi-user detection A communication system transmits and receives a plurality of spread-spectrum signals having differences in at least one diversity parameter. The signals are highly correlated when their diversity parameters are similar, and the signals are uncorrelated when at least... | 06/24/2008 |
| 7388899 | Spreading code structure for ultra wide band communications The ultra wide band communication system of the present invention includes a transmitter (station) and a receiver (station). The transmitter and the receiver employ spreading code comprised of code groups, which respectively comprise varied, auto-correlated codes. C... | 06/17/2008 |
| 7389180 | Electronic tracking and ranging system An electronic tracked and ranging system is disclosed. Electronic tracking and ranging system applies interferometer principles to determine ranging distance from a monitor unit 10 to a tracked unit 12. In particular, the system transmits a monitor dir... | 06/17/2008 |
| 7388898 | Communication device A communication device, able to establish synchronization of frequency and able to continuously track a carrier even if an oscillation frequency of an oscillator changes. The device changes the oscillation frequency of a reference frequency oscillator according to e... | 06/17/2008 |
| 7388900 | Estimation method for space correlation characteristics of noise in a time slotted CDMA system The invention discloses a method for estimating the space correlation characteristics of noise in a time slotted CDMA system. The method comprises the steps of: making channel estimation for the received signal of each antenna of an antenna array, respectively, to o... | 06/17/2008 |
| 7386058 | Transceiver apparatus and transceiving method In a transmitting method for transmitting a transmit signal sequence by a number of subcarriers, a plurality of subcarriers F1, F2, . . . FNSCH exclusively for a synchronization channel are provided, a signal sequence of synchronizat... | 06/10/2008 |
| 7386026 | Method and system for synchronizing and selectively addressing multiple receivers in a wireless, spread spectrum communication system A system and method for synchronizing and selectively addressing multiple receivers in a wireless communication system includes a spread spectrum transmitter and one or more spread spectrum receivers. The transmitter transmits a signal having an observable parameter... | 06/10/2008 |
| 7382822 | Code acquisition device and method using two-step search process in DS-CDMA UWB modem There is provided a code acquisition device and method using a two-step search process in a DS-CDMA UWB modem. The device includes: an I/Q channel symbol generating unit for, generating a plurality (i) of nth I/Q channel symbols in a first search process ... | 06/03/2008 |
| 7376115 | Method for generation of training sequence in channel estimation The embodiments of the present invention discloses a method for generating training sequence in channel estimation, including dynamically determining the length of the channel impulse response of each subscriber respectively according to a real number of subscribers... | 05/20/2008 |
| 7376173 | Unambiguously encoding and decoding signals for wireless channels A method encodes a sequence of blocks of input bits to be transmitted over a wireless channel. Each block of input bits is converted to a codeword, and each codeword is mapped to multiple sub-blocks of complex numbers. Each sub-block is multiplied by a disambiguatin... | 05/20/2008 |
| 7372386 | Parallel digital-to-analog-converter A method for performing parallel digital-to-analog conversion of an n-bit digital input data signal at a frequency of fs including receiving the n-bit digital input data signal; generating M−1 delayed input data signals, M being the number of parallel c... | 05/13/2008 |
| 7372403 | System and method for position determination by impulse radio A system and a method for position determination by impulse radio where first position information is determined for a first impulse radio using a positioning system, second position information is determined for the first impulse radio using at least one second imp... | 05/13/2008 |
| 7372911 | Beam forming and transmit diversity in a multiple array radio communications system A method and apparatus are provided for selecting transmission parameters for multiple transmit antenna arrays. In one embodiment, the invention includes receiving a signal from a remote radio, measuring the transmit coherency of the received signal, selecting, base... | 05/13/2008 |
| 7366201 | Method and apparatus for vector based sequence generation A vector-based sequence generator (100) provides for a general architecture that can be easily adapted to any random length sequence and any random number of bits per access. The sequence generator (100) can also produce a new access on every hardware ... | 04/29/2008 |
| 7362795 | Method and apparatus for acquisition and tracking of GPS satellites at low signal to noise levels A method of acquisition a signal having a low signal to noise ratio (SNR). The method comprises the steps of: (A) detecting a non-zero power in the signal having the low SNR during a power detect process; (B) receiving the signal having the low SNR by using a signal... | 04/22/2008 |
| 7362781 | Wireless methods and devices employing steganography Wireless devices and methods employ steganography to convey auxiliary data in addition to audio information. An exemplary application is a battery-powered cell phone, having, e.g., a microphone, a speaker, a modulator, an antenna, and an RF amplifier. The steganogra... | 04/22/2008 |
| 7362793 | Base station having a set of phased array antennas A spread spectrum base station for receiving a plurality of spread spectrum signals and a plurality of phased spread spectrum signals includes an antenna and a plurality of delay devices connected to the antenna, each delay device outputting a time-delayed spread sp... | 04/22/2008 |
| 7359366 | Uplink ranging system and method in OFDMA system Disclosed is a ranging system and method in an OFDMA system. The ranging system includes complex exponential twiddle storage units for respectively storing complex exponential twiddle factors corresponding to a timing error, complex multipliers for respectively comp... | 04/15/2008 |