Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 8170064 | Method and apparatus for orthogonal frequency division multiplexing communication A method and apparatus for transmitting and receiving a digital signal using an orthogonal frequency division multiplexing (OFDM) communication system are provided. In this method, subcarriers are split into a plurality of subcarrier groups according to available fr... | 05/01/2012 |
| 8102882 | Subcarrier truncating data transmission scheme in OFDM system A multicarrier data transmission scheme is provided. According to the provided scheme, a radio transmitter encodes data bits with different degrees, the degree of an encoded data bit being defined by the number of parity check equations protecting the data bit. The ... | 01/24/2012 |
| 8014422 | Method and system for utilizing a single PLL to clock an array of DDFS for multi-protocol applications Methods and systems for utilizing a single PLL to clock an array of DDFS for multi-protocol applications are disclosed. Aspects of one method may include generating a first signal for use in generating a plurality of local oscillator (LO) signals. The first signal m... | 09/06/2011 |
| 7426242 | Orthogonal frequency digital multiplexing correlation canceller A correlation canceller modulates a communication signal over a plurality of channels and an epoch aperture by a plurality of interference response signals corresponding to linear response by one or more filtering effects to generate an inversely correlated communic... | 09/16/2008 |
| 7400651 | Device and method for interpolating frequency components of signal A frequency interpolation apparatus is provided which reproduces a signal similar to an original signal by approximately recovering suppressed frequency components, from an input signal having the suppressed frequency components in a specific frequency band of the o... | 07/15/2008 |
| 7359715 | Method and system for detecting a preferred wireless network for a mobile device A method and system for detecting a wireless network includes receiving at a mobile device a signal having data indicative of a location of the mobile device. A determination is made whether the mobile device is within the coverage area of a specified network based ... | 04/15/2008 |
| 7352282 | Communication system A communication system includes a power line, a plurality of PLC networks connected to the power line in common, and an electronic control unit for controlling an electric equipment, connected to the power line between the PLC networks. The electronic control unit i... | 04/01/2008 |
| 7327684 | Method of operating, administrating and maintaining very high bit rate digital subscriber line Disclosed is an operation, administration, and maintenance method for very high bit rate digital subscriber line, which has a simplified frame structure, can be easily modified, and can provide various information. In very high bit rate digital subscriber line syste... | 02/05/2008 |
| 7327765 | Home phone line networking next generation enhancements New version devices of a home phone line network may operate on a first carrier frequency (within the new version frequency band) while old version devices may operate at a second carrier frequency (within the old version frequency band). Preamble, header, and trail... | 02/05/2008 |
| 7319723 | Apparatus and method for reducing PAPR in an OFDM mobile communication system Disclosed is an apparatus and method for reducing a peak-to-average power ratio (PAPR) due to multiple subcarriers in an OFDM (Orthogonal Frequency Division Multiplexing) mobile communication system. In the OFDM mobile communication system, a transmitter pre-emphasi... | 01/15/2008 |
| 7295634 | Portable communication device and method therefor Briefly, in accordance with one embodiment of the invention, a portable communication device includes a quantization unit comprising an analog-to-digital converter and a signal generator. The output signal of the analog-to-digital converter may be adjusted to provid... | 11/13/2007 |
| 7269127 | Preamble structures for single-input, single-output (SISO) and multi-input, multi-output (MIMO) communication systems A communication system is provided herein for transmitting frames across a channel. The frames may be transmitted in single-input, single-output (SISO) and/or multi-input, multi-output (MIMO) communication systems. One such frame includes at least one training symbo... | 09/11/2007 |
| 7259482 | Distance extender and method making use of same A distance extender (100, 200) for increasing a distance between a first device (145) and a second device (150) in electrical communication with the first device includes an electrical cable (130, 230) electrically coupled between the fir... | 08/21/2007 |
| 7236765 | Data communication over power lines A system for receiving and processing signals received from a plurality of endpoints. Each endpoint includes an endpoint transmitter in electrical communication with a power distribution line within a power distribution system. The system comprises a power line coup... | 06/26/2007 |
| 7230993 | Method and apparatus for modulation using an at least four-dimensional signal constellation A digital communication system (20) in which a signal constellation (30) of a dimensionality of at least four is used, with distance properties chosen to reduce the bit error rate compared to that of digital communication systems using signal constella... | 06/12/2007 |
| 7214182 | Wireless in-vivo information acquiring system, body-insertable device, and external device A pill inserted into a body of a patient acquires in-vivo information on the body of the patient. A receiver disposed on the outside of the body receives the in-vivo information on the body of the patient from the pill through an antenna. When a power supply signal ... | 05/08/2007 |
| 7206367 | Apparatus and method to synchronize multimedia playback over a network using out-of-band signaling An apparatus and method to synchronize devices in a network to a sub-millisecond timing accuracy. In a first embodiment, the transmission of data is synchronized between a first source device and destination devices communicatively coupled to a network. In a second ... | 04/17/2007 |
| 7187734 | Method of slip compensation for integer frequency offset correction in a wireless communication system A method of correctly estimating the frequency offset when the CPE modem has already acquired and is tracking the OFDM burst boundaries in an OFDM-based, wireless communication system. CPS data in an OFDM-based, wireless communication system is modulated as QPSK dat... | 03/06/2007 |
| 7180412 | Power line communication system having time server A system for bi-directional power distribution line communication. The system is configured for data communication with an endpoint transceiver located at a customer premise. The system comprises a time server in electrical communication with the transceiver, the ti... | 02/20/2007 |
| 7171216 | Method and system for detecting a preferred wireless network for a mobile device A method and system for detecting a wireless network includes receiving at a mobile device a signal having data indicative of a location of the mobile device. A determination is made whether the mobile device is within the coverage area of a specified network based ... | 01/30/2007 |
| 7145438 | Endpoint event processing system An endpoint processor includes a processor block, a timer block, a memory block, and analog-to-digital converter. The timer block is arranged to provide a time based signal to the processor block. The memory block cooperates with the processor block. The analog-to-d... | 12/05/2006 |
| 7143013 | Reliable symbols as a means of improving the performance of information transmission systems All practical communication channels impose some type of corruption on received data through inter-symbol interference (ISI). ISI corruption is particularly acute in high-order constellation transmission. Although ISI effects of high-order constellation transmission... | 11/28/2006 |
| 7139324 | Closed loop feedback system for improved down link performance A method includes receiving at least two space-time coded signals from an antenna system associated with a first station, determining complex channel state information based on the received space-time coded signals, and sending the complex channel state information ... | 11/21/2006 |
| 7139322 | Method for reducing peak-to-average power ratios in a multi-carrier transmission system The present invention provides a technique to reduce peak-to-average power ratio (PAR) of multi-carrier transmission systems. A non-empty subset of the subcarriers includes “PAR subcarriers.” The PAR subcarriers have constellations obtained by reducing a constel... | 11/21/2006 |
| 7130277 | Communication system and communication method Nodes (N1 to N3) include MTU length calculation sections (31 to 33) which multiply baud rates (D21 to D23) of communication parameters (D11 to D13) set based on results of negotiation with other nodes (N1 | 10/31/2006 |
| 7127227 | Digital down-converter A digital down-converter having a low spurious level and a high frequency precision without increasing power consumption of a local oscillator. A first mixer receives, as a first IF input signal, a digital signal obtained by sampling a received signal with an RF sig... | 10/24/2006 |
| 7103097 | System and method for reducing peak-to-average ratio (PAR) values A system and method for reducing peak-to-average ratio (PAR) values in signal transmission systems is presented. The presented approach divides a plurality of symbols into a number of non-overlapping subsets of symbols, and manipulates each of the non-overlapping su... | 09/05/2006 |
| 7092669 | System for facilitating teaching and learning An input device of a multimedia board inputs lecturer-written information that a lecturer writes on a display page. An information processor sends the lecturer-written information input by the input device to a plurality of information terminals. A reader/writer of ... | 08/15/2006 |
| 7085223 | Communication device for receiving and transmitting OFDM signals in a wireless communication system A communication device for receiving and transmitting OFDM signals in a wireless communication system, in which each OFDM signal is composed of a plurality of subcarrier signals each being assigned to a respective transmission channel. The device includes a diversit... | 08/01/2006 |
| 7046958 | Method and system for radio communication with mobile units The invention concerns a system and a method of radio communication between a plurality of mobile units (6) and a stationary system (1, 3, 12, 14) comprising one or several transmitter units (3), wherein radio communication to one or several mob... | 05/16/2006 |
| 7042857 | Uplink pilot and signaling transmission in wireless communication systems Techniques to more efficiently transmit pilot and signaling on the uplink in an OFDM system. With subband multiplexing, M usable subbands in the system are partitioned into Q disjoint groups of subbands. Each subband group may be assigned to a different terminal for... | 05/09/2006 |
| 7043201 | Two-way radio communication system and two-way radio communication method Only a first radio station is equipped with a local oscillation signal source. A signal transmitted to a second radio station includes local oscilaation signal components used to up-convert a modulated intermediate frequency band signal in addition to intermediate f... | 05/09/2006 |
| 7035288 | Modulation of a pilot carrier, and means to perform this modulation For synchronisation purposes, a transmitter (TX) multiplexes a pilot carrier with carriers whereon data elements (DATA) are modulated, and transmits the pilot carrier together with the modulated carriers to a receiver (RX). The immunity of the pilot carrier for inte... | 04/25/2006 |
| 7031250 | Method and apparatus for channel estimation Various methods and systems efficiently implement broadband multi-carrier communication systems. The invention exploits the structural properties of a frequency-domain channel estimator and transforms it into the time domain. This allows the sharing of certain block... | 04/18/2006 |
| 7031380 | Multi-client ADSL modem A multi-client ADSL modem network (10) that can be configured for a home or office network when multiple ADSL client modems (18) are installed in different communication terminals (22). One ADSL modem (14) at a central office (12) ... | 04/18/2006 |
| 7023930 | Reducing the crest factor of a multicarrier signal A method for reducing the crest factor of a multi-carrier signal includes evaluating an inverse Fourier transform of the multi-carrier signal, thereby generating a transformed multi-carrier signal; defining a signal-to-be-corrected to be the transformed multi-carrie... | 04/04/2006 |
| 7016298 | Signal transmission/reception system of orthogonal frequency division multiplexing A transmission apparatus of orthogonal frequency division multiplexing for multiplexing a plurality of carriers orthogonal to one another to transmit a modulated signal. The transmission apparatus includes a first modulator for outputting a code modulated in accorda... | 03/21/2006 |
| 6967966 | Digital return path for hybrid fiber/coax network An optical distribution node for an hybrid fiber/coax network is provided. The optical distribution node includes a laser transmitter coupleable to a fiber optic link that transmits upstream, digital data to a head end of the network. The node also includes a data c... | 11/22/2005 |
| 6947476 | Method for synchronizing frame by using pilot pattern in compressed mode Method for synchronizing frames by using pilot patterns in a compressed mode. In a case a W-CDMA mobile communication system is operated in a compressed mode, the present invention permits to restore perfect frame synchronization words in frames by using dedicated p... | 09/20/2005 |
| 6937558 | Transmitter apparatus and receiver apparatus and base station making use of orthogonal frequency division multiplexing and spectrum spreading An improved transmitter apparatus, a receiver apparatus and a base station implemented with the transmitter and receiver apparatuses are described. These apparatuses and the base station serves to establish communication by making use of an orthogonal frequency divi... | 08/30/2005 |
