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"I watched his countenance closely, to see if he was not deranged ... and I was assured by other senators after he left the room that they had no confidence in it."
U.S. Senator Smith of Indiana ; After seeing Samuel Morse demonstrate the telegraph.
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| Number | Title | Issue Date |
| 8179779 | Pilot signal allocation method and apparatus for multi-user wireless systems A construction is provided for uplink pilot signals in a cellular network. Three sets of pilot signals are defined, having orthogonality properties that lead to reduced inter-cell interference. In example embodiments, the network has a reuse factor of 3 for pilot si... | 05/15/2012 |
| 8139472 | Bit swap architecture in digital subscriber line communication systems A system includes a linked-list generator module that generates a linked list of tones based on tones and bit loads of the respective tones in a digital subscriber line (DSL) communication system, a trellis encoder module that encodes data bits associated with respe... | 03/20/2012 |
| 8000222 | Wireless communication device adopting OFDM modulation A wireless communication device includes a converting circuit, a discrete Fourier transformer, a separating circuit, a correcting unit. The converting circuit converts an analog signal having an in-phase component and a quadrature component into a digital signal hav... | 08/16/2011 |
| 7983141 | Synchronized multipoint-to-point communication using orthogonal frequency division A multipoint-to-point, orthogonal frequency division multiplexed (OFDM) communication system is provided. The system includes a plurality of remote units and a host unit that includes a demodulator. Each of the remote units transmits an upstream OFDM signal using a ... | 07/19/2011 |
| 7855947 | Method for transmitting pilot for multiple carrier system A method of transmitting pilot signals in a system which performs communication using two or more earners comprises transmitting first pilots and second pilots from at least one user equipment to a base station, the first and second pilots, which are transmitted fro... | 12/21/2010 |
| 7848217 | Software based spread spectrum signal processing A software correlator comprising: a partitioning module adapted to divide a number of the received data samples into a first number of data blocks; a first correlation module adapted to correlate each of the data blocks with a respective local code replica segment t... | 12/07/2010 |
| 7835262 | Multi-band OFDM communications system System and method for providing multiple access in a multi-band, orthogonal frequency division multiplexed (multi-band-OFDM) communications system. A preferred embodiment comprises determining a transmission bandwidth to support a performance requirement and configu... | 11/16/2010 |
| 7817532 | Adaptive allocation for variable bandwidth multicarrier communication Data is distributed among the channels of an asynchronous data subscriber loop (ADSL) communications system in accordance with an adaptive algorithm which from time to time measures the signal to noise ratio of the various channels and finds a margin for each channe... | 10/19/2010 |
| 7672219 | Multipoint-to-point communication using orthogonal frequency division multiplexing A bidirectional communication system is provided. The system includes a first remote unit for communicating with a host unit using orthogonal frequency division multiplexing. The host unit is communicatively coupled to a plurality of remote units in a multipoint-to-... | 03/02/2010 |
| 7639599 | Embedding supplementary data in an information signal Disclosed is a method of adjusting a supplementary data signal (wm(n)) to be embedded in an information signal (x(n)), for example an audio signal. The method comprises the steps of determining (301) a position where a predetermined property of the informatio... | 12/29/2009 |
| 7613103 | Apparatus and method for decoding turbo TCM using coset mapping A turbo TCM decoder for performing a soft decision without performing a sector phase quantization is disclosed. The turbo TCM decoder includes: a symbol transformer for converting a received signal to signal bits of QPSK mode by using an I-axis coordinate and a Q-ax... | 11/03/2009 |
| 7486608 | Efficient implementation of low power mode in digital subscriber line (DSL) transceivers Efficient implementation techniques of a low power mode, (i.e. L2 mode for ADSL2) for DSL transceivers are described. The techniques save memory space and reduce implementation complexity. A constellation mapper in a DSL transmitter determines the number of bits to ... | 02/03/2009 |
| 7433297 | Wireless internet access system and method A wireless Internet access system and method supports the transmission and reception of multiple types of traffic between mobile subscriber units and existing networks. A frame structure is used that can support the transmission of multiple types of traffic and adap... | 10/07/2008 |
| 7426177 | Round trip delay adjustment in multipoint-to-point communication using orthogonal frequency division multiplexing Systems and methods for bidirectional communication are provided. In one embodiment, a method for aligning communications from a plurality of remote units in a multipoint-to-point orthogonal frequency division multiplexed (OFDM) communications comprises sending a fi... | 09/16/2008 |
| 7418049 | Method and apparatus for decoding baseband orthogonal frequency division multiplex signals A method and apparatus for decoding baseband OFDM signals include processing that begins by slicing each sub-carrier signal of the OFDM signal into a plurality of error terms. The particular number of error terms generated for each sub-carrier signal depends on the ... | 08/26/2008 |
| 7414958 | Efficient tone ordering for multitone transmission A method for data communication includes providing an order for assigning bits of an input data stream to tones in a multi-tone modulation scheme, and allocating respective bit-loading values to the tones, such that some of the tones are allocated a first bit-loadin... | 08/19/2008 |
| 7391711 | Method and system for adaptive modulation Methods and systems for adaptive modulation are provided. In one embodiment, a method for a plurality of remote units of an orthogonal frequency division multiplexing multipoint-to-point communications system comprises: establishing communication between a plurality... | 06/24/2008 |
| 7391712 | Method and system for forward-looking tone allocation Methods and systems for forward-looking tone allocation are provided. In one embodiment, a method for an orthogonal frequency division multiplexing (OFDM) multipoint-to-point communications system comprises: establishing communication between a plurality of remote u... | 06/24/2008 |
| 7386056 | Method to increase performance of secondary data in a hierarchical modulation scheme The present invention provides a receiver for use in a SDAR system, the receiver including a receiving unit having satellite signal detection means for detecting a transmit signal transmitted from a satellite, the transmit signal produced when the transmitter modula... | 06/10/2008 |
| 7376878 | Compensating for errors received in a signal A signal correcting and compensating system including a signal transceiver, a personal computer, a signal database, and a signal correction component. A signal sent by a remote control may be subjected to a distortion causing nuisance before it is received by a tran... | 05/20/2008 |
| 7366244 | Method and system for antenna interference cancellation A wireless communication system can comprise two or more antennas that interfere with one another via free space coupling, surface wave crosstalk, dielectric leakage, or other interference effect. The interference effect can produce an interference signal on one of ... | 04/29/2008 |
| RE40254 | Method and system for realising a fast control channel in a cellular radio network Signalling information is conveyed from a transmitting device (101) to a receiving device (102) in a cellular radio network where user data transmission takes place on a traffic channel in discrete transmission bursts (111-120; 211-220... | 04/22/2008 |
| 7363007 | Adaptive modulation/demodulation method and radio communications systems Adaptive modulation/demodulation method in a radio communication system is provided. A modulation multi-level number in a transmission device and a demodulation multi-level number in a reception device are judged independently from each other according to a propagat... | 04/22/2008 |
| 7349486 | System and method for recognizing zero-amplitude symbols in a QAM signal and digital receiver incorporating the same A system for, and method of, recognizing zero-amplitude symbols in a quadrature amplitude modulated (QAM) signal and a digital receiver incorporating the system or the method. In one embodiment, the system includes: (1) an amplitude detector that extracts a candidat... | 03/25/2008 |
| 7349503 | Adaptive interference immunity control Wireless local area networks must work in less than ideal environments, including environments having externally and internally generated interfering RF signals. Interfering signals can cause significant problems with signal detecting, amplifier gain adjustment, and... | 03/25/2008 |
| 7349459 | Multiuser detection method and device in DS-CDMA mode A method and device for processing a received signal by detecting within the received signal a plurality of possible symbols transmitted by or for a plurality K of users, each of the plurality of possible symbols belonging to a modulation constellation and being the... | 03/25/2008 |
| 7333555 | Device, system and method for wireless combined-signal communication Briefly, some embodiments of the invention may provide devices, systems and methods for wireless combined-signal communication. For example, a method in accordance with an embodiment of the invention may include transmitting a combined signal over a combined channel... | 02/19/2008 |
| 7324428 | Frame identifier Method and system for determining the number of one or more of a sequence of M+1 consecutive OFDM frames from analysis of the designated preambles of two or more consecutive frames (m=0, 1, . . . , M; M≧1). An overlap function OF(m;k) is formed for each frame with... | 01/29/2008 |
| 7313099 | Phase system rotation for power estimation A receiver, an integrated circuit chip and a method are provided for estimating the power of a digitally modulated signal received by the receiver in a communication system. The method comprises determining in-phase and quadrature-phase values of a phase constellati... | 12/25/2007 |
| 7313125 | OFDM demodulation method and semiconductor integrated circuit device The invention comprises: processing for receiving an OFDM packet having a preamble and the following data transmission symbol, in which packet the subcarrier interval of the preamble is set wider than that of the data transmission symbol; processing for estimating a... | 12/25/2007 |
| 7292526 | Mobile communication system, radio control station, base station and mobile station for the system, and parameter determination method employing parallel combinatory spread-spectrum scheme A mobile communication system is provided for use in communication. The mobile communication system may include a radio control station (CS), a base station (BS), and a mobile station (MS). The BS is connected to the CS, and the MS may perform, with the BS, data com... | 11/06/2007 |
| 7289791 | Methods of recording voice signals in a mobile set The present invention relates to a mobile set integrating a memory efficient data storage system for the real time recording of voice conversations, data transmission and the like. The data recorder has the capacity to selectively choose the most relevant time frame... | 10/30/2007 |
| 7289460 | Satellite communications system Embodiments of the present invention are directed to a satellite communications system between satellites and terminal units that are sufficiently small to be handheld units and that operate within the earth power flux density limit. This is accomplished by using sp... | 10/30/2007 |
| 7280607 | Ultra wide bandwidth communications method and system An ultra wide bandwidth, high speed, spread spectrum communications system uses short wavelets of electromagnetic energy to transmit information through objects such as walls or earth. The communication system uses baseband codes formed from time shifted and inverte... | 10/09/2007 |
| 7274653 | Hierarchical QAM transmission system with varying grouping factor A hierarchical QAM system allows the transmission of different sources by embedding the relative constellation points. A QAM transmitting system, includes a source of a level 1 and a level 2 data stream, each data stream carrying successive symbols. A hierarchical Q... | 09/25/2007 |
| 7269394 | Frequency offset compensation for communication systems In communications between a pair of stations using modulated carrier signals, a first station estimates the carrier frequency offset with respect to the second station and transmits signals that are responsive to the estimated carrier frequency offset. The first sta... | 09/11/2007 |
| 7269151 | System and method for spectrum management of a shared frequency band A system and method for managing the spectrum utilization of a frequency band that is shared, both in frequency and time, by multiple devices. At one or more devices operating in the frequency band, pulses associated with signals occurring in the frequency band are ... | 09/11/2007 |
| 7265588 | Dynamic clock change circuit A clock change circuit includes enabling a clock change frequency to be accepted while a system is active and clock frequencies are at a low period. The circuit includes generating an enabling signal representing a window of time in which a frequency change is accom... | 09/04/2007 |
| 7263130 | Method and apparatus for evaluating error control parameters of self-similar constellations A method and apparatus implementing the method, of selecting a bit load b for a channel in a carrier system. The carrier system encodes data based on a constellation of points. Each point represents a tuple of data. The constellation has a self-similarity property. ... | 08/28/2007 |
| 7254167 | Constellation-multiplexed transmitter and receiver A device of dynamic communication of information allows, on the average, non-integer bits per symbol transmission, using a compact code set or a partial response decoding receiver. A stream of selectable predetermined integer bits, e.g., k or k+1 data bits, is group... | 08/07/2007 |
