Quotables
"To place a man in a multi-stage rocket and project him into the controlling gravitational field of the moon where the passengers can make scientific observations, perhaps land alive, and then return to earth--all that constitutes a wild dream worthy of Jules Verne. I am bold enough to say that such a man-made voyage will never occur regardless of all future advances."
Lee deForest, American radio pioneer ; 1957
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| Number | Title | Issue Date |
| 7099639 | Automatic frequency control apparatus for determining loop gain constant based on absolute phase error An automatic frequency control apparatus includes a mixer, a phase error detector, an absolute value converter, a determination unit, a multiplier and an oscillator. The mixer performs a frequency alternation of a phase modulated signal received thereto based on a f... | 08/29/2006 |
| 7099268 | Orthogonal frequency division multiplex modem circuit To provide an orthogonal frequency division multiplex modem circuit which can multiplex signals, whose bit rates and QoS are different from one another, and can transmit the signals via one OFDM line. A serial/parallel converter converts input signals into a complex... | 08/29/2006 |
| 7099270 | Multi-path equalization for orthogonal frequency division multiplexing communication system A multi-path equalization system for orthogonal frequency division multiplexing communication (OFDM) system includes a first estimator for estimating the channel characteristic using pilot signal. A divider is coupled to the estimator for dividing each sub-carrier w... | 08/29/2006 |
| 7099397 | Receiver of an orthogonal frequency division multiplexing system In an orthogonal frequency division multiplexing (OFDM) system, a receiver includes a received signal transformer, a frequency offset estimator and a frequency compensator. The received signal transformer removes from a training symbol a guardtone and a sub-carrier ... | 08/29/2006 |
| 7099266 | Orthogonal frequency division multiplexed signal transmitting apparatus, orthogonal frequency division multiplexed signal receiving apparatus, and orthogonal frequency division multiplexed signal transmitting/receiving system An orthogonal frequency division multiplexed signal transmitting apparatus executes a time-division multiplexing process that inserts a reference signal at a predetermined interval based on reference signal position information into an information signal to be trans... | 08/29/2006 |
| 7099374 | Wireless communication systems and methods for long-code communications for regenerative multiple user detection involving matched-filter outputs The invention provides improved CDMA, WCDMA (UTMS) or other spread spectrum communication systems of the type that processes one or more spread-spectrum waveforms, each representative of a waveform received from a respective user (or other transmitting device). The ... | 08/29/2006 |
| 7099396 | Multicarrier modulation using weighted prototype functions A method of modulating a multicarrier signal involves obtaining a set of 2M representative complex coefficients of transmitted data. 2LM linear combinations are calculated so as to leave 2M obtained complex coefficients. Coefficients of balancing used in these combi... | 08/29/2006 |
| 7099413 | Method for near optimal joint channel estimation and data detection for COFDM systems Joint channel estimation and maximum likelihood decoding method for Coded Orthogonal Frequency Division Multiplexing (COFDM) systems are presented. Using this method in conjunction with convolutional coding, robust and nearly optimal coherent detection can be achiev... | 08/29/2006 |
| 7099626 | Method and apparatus for gain equalization based on wide-band multi-carrier base station A method and apparatus of gain equalization based on a wide-band multi-carrier base station calculates or tests non-uniformity of a gain of an analog intermediate frequency and a radio frequency in advance and stores corresponding correction values in tables. In an ... | 08/29/2006 |
| 7099628 | Training signal in a single carrier transmission A system and method for enhancing the reception of a single carrier signal. The single carrier signal includes periodic training signal and data. The system includes a transmitter configured such that L symbols of either the beginning or end of the N symbols of the ... | 08/29/2006 |
| 7099678 | System and method for transmit weight computation for vector beamforming radio communication A system and method for vector wireless radio communication (multiple modes or signal streams) between a first communication device and a second communication device using radio frequency (RF) communication techniques. At each communication device, signals are recei... | 08/29/2006 |
| 7095709 | Diversity transmission modes for MIMO OFDM communication systems Techniques for transmitting data using a number of diversity transmission modes to improve reliability. At a transmitter, for each of one or more data streams, a particular diversity transmission mode is selected for use from among a number of possible transmission ... | 08/22/2006 |
| 7095755 | Data transfer apparatus and its control method In data transfer in isochronous mode using an IEEE1394 serial bus, the data transfer rate is guaranteed, but data transfer is disabled if the number of channels is insufficient. An already assigned channel is released by lowering the data transfer rate currently usi... | 08/22/2006 |
| 7095708 | Methods and apparatus for use in communicating voice and high speed data in a wireless communication system A fixed wireless system (FWS) utilizing Orthogonal Frequency Division Multiplexing (OFDM) communication techniques is spectrally efficient and responsive to communications involving both voice and high speed data, such as Internet data. The FWS includes a wireless b... | 08/22/2006 |
| 7095790 | Transmission schemes for multi-antenna communication systems utilizing multi-carrier modulation Pilot and data transmission schemes for multi-antenna communication systems utilizing multi-carrier modulation are provided. Subband multiplexing is used to avoid interference resulting from transmitting multiple signals simultaneously from multiple antennas. M usab... | 08/22/2006 |
| 7095995 | Diversity receiver and orthogonal frequency division multiplexed signal receiving method A technique for stably receiving an orthogonal frequency division multiplexed signal by means of a simple structure. Delay circuits 9–11 add delay times to the signals simultaneously received by antennas 1–4 in such a way that the delay time difference between a... | 08/22/2006 |
| 7095996 | Wireless communication system, and demodulation method and data rate control method therefor A transmitter and a receiver share a maximum number of transmission bits per symbol as a parameter. The transmitter modulates an encoded and interleaved transmission signal in accordance with a modulation scheme which enables the transmission of one bit or more per ... | 08/22/2006 |
| 7092353 | Carrier search methods and apparatus Transmitting signals, e.g., high power narrow band signals on a periodic basis to facilitate detection of a frequency band and/or carrier signal to be used for communication with a basestation are described. The detected frequency band may be a downlink frequency ba... | 08/15/2006 |
| 7092352 | Cancellation systems for multicarrier transceiver arrays Frequency-dependent cancellation separates a plurality of interfering signals received by a plurality of receivers. Received wideband single-carrier signals or multicarrier signals are separated into a plurality of narrowband subcarriers. Sub-carrier frequencies and... | 08/15/2006 |
| 7092642 | Tunable channel spacing for wavelength division multiplexing (WDM) transport system A method and system for tuning channel spacing for a wavelength division multiplexing (WDM) transport system includes determining a spectrum width for a channel. A bandwidth of a group of base channels covering the spectrum width for the channel is allocated to the ... | 08/15/2006 |
| 7089184 | Speech recognition for recognizing speaker-independent, continuous speech A speech recognition method and apparatus are provided for converting a voice stream into a digital voice stream representation. A method for performing speech recognition on a voice stream according to a first method embodiment includes the steps of determining one... | 08/08/2006 |
| 7088787 | Post-FFT scaling to reduce multiple effects A method of scaling at a receiver representations of training signals received from a transmitter. The method includes producing a frequency domain representation of at least one long training symbol received at the receiver and a frequency domain representation of ... | 08/08/2006 |
| 7085315 | Digital demodulation utilizing frequency equalization A method and apparatus for digital demodulation for use in a wireless communication device include processing that begins by performing a fast Fourier transform to convert a plurality of time domain symbol components representing inbound data into a plurality of fre... | 08/01/2006 |
| 7082301 | Method and system for triggering handoff of a call between networks A method for handing off a call between networks includes monitoring a quality of a first link between a mobile station and a wireless local area network (WLAN) when the mobile station is actively connected with the WLAN on a call and monitoring a quality of a secon... | 07/25/2006 |
| 7079828 | Method and apparatus for side-lobe cancellation in wideband radio systems In a multi-user radio receiver, a method and apparatus for reducing the effects of non-linear distortion due to adjacent channel interference (ACI) includes receiving and processing a multi-user information signal to provide a plurality of multi-user information val... | 07/18/2006 |
| 7079824 | Reception of multicarrier spread-spectrum signals A system (100), receiver (160-190) and method of operation for spread OFDM wireless communication (single user OFDM-CDMA with cyclic-prefix) by: equalizing the received spread OFDM signal (y) and splitting it into first and second portions (ŝ | 07/18/2006 |
| 7079820 | Combining signals exhibiting multiple types of diversity Combining signals includes receiving first signals having a first frequency and second signals having a second frequency. A first weight reflecting a signal-to-noise ratio associated with a first signal is determined for each first signal, and a first signal output ... | 07/18/2006 |
| 7079602 | Receiving apparatus and method and provision medium An interference signal from an adjacent signal is prevented and a desired signal demodulated. A frequency conversion circuit 4 converts a received signal frequency to a first intermediate frequency signal of a first intermediate frequency higher than t... | 07/18/2006 |
| 7079586 | Systems and methods for optimal distribution of symbols in a fixed size data packet to improve receiver performance There is disclosed a transmitter for transmitting a stream of known symbols and unknown symbols through a transmission channel to a first receiver that receives the transmitted stream of known symbols and unknown symbols distorted by intersymbol interference (ISI) a... | 07/18/2006 |
| 7079570 | Communication system with receivers employing generalized two-stage data estimation A wireless communication system comprises first and second communication stations which send and receive symbols in signals in a shared spectrum. The symbols are recovered from the received signals. Codes of the signals are processed using a block Fourier transform ... | 07/18/2006 |
| 7079866 | Adaptive array antenna and a method of calibrating the same An adaptive array antenna includes an array antenna having a plurality of antenna elements, and a plurality of reception units for receiving reception signals from the respective antenna elements, multiplying the reception signals by respective reception weighting c... | 07/18/2006 |
| 7075978 | Multi-tone transmission A Multi-tone transmission system processes input data through a plurality of intermediate processing stages 12, 14, 16 and corresponding stages of intermediate data 18, 20. A symbol including a number of tones is obtained therefrom by an inverse Fourie... | 07/11/2006 |
| 7075949 | OFDM receiving device and OFDM receiving method The time required for switch the channel can be remarkably curtailed. When broadcasting signals through a plurality of information channels with an OFDM system, the plurality of information channels are multiplexed in the sense of frequency and collectively subjecte... | 07/11/2006 |
| 7072365 | System and method for multiplexing broadband signals A frequency agile cable modem termination system which is configured to receive cable TV or other broadband signals on a frequency allocated basis. Cable TV headend may receive cable TV modem or other signals via optical/electrical converters and other links, and ro... | 07/04/2006 |
| 7071994 | System and method for nondisruptively embedding an OFDM modulated data signal into a composite video signal A method and system for sending and receiving binary bit stream in a composite video signal, such as a NTSC signal. The binary bit stream is modulated according to quadrature amplitude modulation, converted to analog and translated to an intermediate frequency relat... | 07/04/2006 |
| 7072419 | Data communication apparatus and method based on orthogonal frequency division multiple access A data communication apparatus and method based on orthogonal frequency division multiple access (OFDMA) are provided. In the data communication apparatus, a (U+1)-th encoder in a u-th user transmitting unit among U user transmitting units which transmit correspondi... | 07/04/2006 |
| 7072411 | Computation reduction in OFDM system using frequency domain processing Improved systems and methods for implementing Orthogonal Frequency Division Multiplexing (OFDM) systems and for computing Fast Fourier Transforms (FET) having strictly real outputs are provided. Systems and methods are provided for efficiently implementing an Invers... | 07/04/2006 |
| 7072413 | Method and apparatus for processing data for transmission in a multi-channel communication system using selective channel inversion Techniques to process data for transmission over multiple transmission channels. The available transmission channels are segregated into one or more groups, and the channels in each group are selected for use for data transmission. Data for each group is coded and m... | 07/04/2006 |
| 7072290 | Single user detection base station A code division multiple access base station is used in receiving a plurality of data signals over a shared spectrum. Each received data signal experiences a similar channel response. A combined signal of the received data signals is received over the shared spectru... | 07/04/2006 |
| 7068593 | Apparatus and method for synchronizing frequency in orthogonal frequency division multiplexing communication system A frequency synchronization apparatus for an orthogonal frequency division multiplexing (OFDM) communication system includes a radio frequency (RF) receiving module for receiving OFDM signal, an analog/digital (A/D) converter connected to the RF receiving module, th... | 06/27/2006 |
