Did You Know...
...that one person who claimed to be the inventor of the television is Russian emigre Vladimir Zworykin? In 1929 David Sarnoff, founder of RCA, asked Zworykin what it would take to develop TV for commercial use. He said: a year and a half and $100,000. In reality, it took 20 years and $50 million! Before his death in 1982 at the age of 92, Zworykin said of his invention: "The technique is wonderful. It is beyond my expectations. But the programs! I would never let my children even come close to this thing."
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| Number | Title | Issue Date |
| 8014462 | Apparatus for performing alternating quadratures differential binary phase shift keying modulation and demodulation Methods, apparatus, and systems for alternating quadratures differential binary phase shift keying (AQDBPSK) modulation and demodulation radically increase overall energy efficiency of a communication system due to the combined effect of efficient utilization of tra... | 09/06/2011 |
| 7844011 | Apparatus and method for improving symbol error rate performance of M-ary phase shift keying system having quadrature error An apparatus and method for improving a symbol error rate of an M-ary phase shift keying (M-PSK) system having a quadrature error are provided. The apparatus includes: a conversion parameter detector that detects a conversion parameter and converts a symbol decision... | 11/30/2010 |
| 7792209 | Digital DPSK demodulation method and system An aircraft transponder comprises an antenna for receiving an RF signal a downconverter coupled to the antenna for downconverting the RF signal to an IF signal, an analog-to-digital converter coupled to the downconverter to digitize the IF signal to produce a digita... | 09/07/2010 |
| 7756213 | Method for enhancing bluetooth transmission speed and robustness of emitting end and receiving end of communication system A method for enhancing the Bluetooth transmission speed and robustness of an emitting end and a receiving end is provided. The method is utilized in a system having an emitting end and a receiving end, wherein at least one of the emitting and receiving ends is provi... | 07/13/2010 |
| 7693229 | Transmission of signals in cellular systems and in mobile networks A system and method for processing a received Global Positioning System (GPS) signal into a processed position finding GPS signal and for processing a first and a second input signal jointly with the GPS signal. A modulator and transmitter for modulation and transmi... | 04/06/2010 |
| 7688911 | Method and apparatus for synchronizing alternating quadratures differential binary phase shift keying modulation and demodulation arrangements Methods, apparatus, and systems for alternating quadratures differential binary phase shift keying (AQDBPSK) modulation and demodulation radically increase overall energy efficiency of a communication system due to the combined effect of efficient utilization of tra... | 03/30/2010 |
| 7649956 | Modulation and demodulation system, modulator, demodulator and phase modulation method and phase demodulation method used therefor A modulation and demodulation system capable of minimizing a bit error rate in a six-phase phase modulation method. A senary signal phase-modulated and outputted by a modulator is received and phase-modulated by a destination demodulator to a binary signal before co... | 01/19/2010 |
| 7539265 | Multiple-input multiple-output code division multiple access (MIMO-CDMA) wireless communication equipment A multiple-input multiple-output code division multiple access (MIMO-CDMA) wireless communication equipment has a transmitter and a receiver. The transmitter has an encoder for receiving and encoding a plurality of data, and sending the data to a quadrature phase-sh... | 05/26/2009 |
| 7539266 | Phase shift keying wireless communication apparatus and method A network device comprises a PSK modulator that PSK modulates a header portion of a data packet at a first effective throughput and that PSK modulates outbound data at a second effective throughput to form a PSK modulated payload. A symbol modulator symbol modulates... | 05/26/2009 |
| 7529314 | Carrier phase detector Carrier phase detector for calculation of a feedback signal (D) for a carrier phase loop in a receiver, which loop detects a phase error (Δφ) between a phase (φin) of a received signal (Ein), which comprises a sequence of receiv... | 05/05/2009 |
| 7515645 | Method for dividing the bit rate of QPSK signals into two or several subchannels The invention relates to a method for dividing the bit rate of QPSK signals by splitting the spectrum of said QPSK signals into at least two channels having band-limited filters in the modulator and demodulator. The prefiltered QPSK signal is split into at least one... | 04/07/2009 |
| 7512188 | Phase shift keying signaling for integrated circuits The present invention relates to a system for communicating between two integrated circuits (ICs) or within an IC. The ICs are either on the same circuit boards or on different circuit boards with a common backplane. The system comprises a first integrated circuit h... | 03/31/2009 |
| 7443921 | Mobile body communication apparatus When communications of the same data are performed using a multi-carrier modulation method between a plurality of base stations and a mobile station at the same time and with the same frequency, a standing wave interference is generated to lower the carrier electric... | 10/28/2008 |
| 7436902 | Multi-dimensional space Gray code maps for multi-dimensional phase modulation as applied to LDPC (Low Density Parity Check) coded modulation Multi-dimensional space Gray code maps for multi-dimensional phase modulation as applied to LDPC (Low Density Parity Check) coded modulation. A novel approach is provided within LDPC coded modulation communication systems that employ multi-dimensional phase modulati... | 10/14/2008 |
| 7433418 | Method and apparatus for efficient storage of training sequences for peak to average power constrained modulation formats Some embodiments store a training sequence in a communications system. The stored training sequence exhibits certain desirable characteristics when used by a peak to average power constrained modulation format. In one embodiment, a set of original ordered sequences ... | 10/07/2008 |
| 7430247 | Carrier frequency detection for N-ary phase modulated signal Carrier frequency detection for an N-ary modulated signal is achieved by digitizing the N-ary modulated signal, frequency shifting the digitized N-ary modulated signal to prevent aliasing, raising the frequency-shifted signal to the Nth power, transformin... | 09/30/2008 |
| 7428273 | Method and apparatus for efficient preamble detection in digital data receivers Traditional techniques for data reception in burst-mode receivers are of significant complexity. To aid detection, most burst-mode systems transmit a preamble, or predetermined data pattern, at the start of each new block of data. Using current methods, the detectio... | 09/23/2008 |
| 7426246 | Dual layer signal processing in a layered modulation digital signal system Systems and methods for receiving layered modulation for digital signals are presented. An exemplary apparatus comprises a tuner for receiving a layered signal and producing a layered in-phase signal and a layered quadrature signal therefrom, an analog-to-digital co... | 09/16/2008 |
| 7424662 | Method and system for providing low density parity check (LDPC) encoding An approach is provided for a method of encoding structure Low Density Parity Check (LDPC) codes. Memory storing information representing a structured parity check Matrix of Low Density Parity Check (LDPC) codes is accessed during the encoding process. The informati... | 09/09/2008 |
| 7424068 | Method and system for coding/decoding signals and computer program product therefor A method for decoding signals with encoded symbols over a symbol interval that modulate a carrier. The method includes phase locking the signal to be decoded to obtain a phase-locked signal. The value assumed by the phase-locked signal on at least one subinterval in... | 09/09/2008 |
| 7418047 | Communication apparatus using a plurality of modulation schemes and transmission apparatus composing such communication apparatus A first signal generation section 11 generates a baseband modulation signal for an ASK modulation scheme from transmission data. A second signal generation section 12 generates a pair of baseband modulation signals for a non-ASK modulation scheme from ... | 08/26/2008 |
| 7415078 | Demodulation for phase modulation A method and pre-processor for processing a MCPM signal including a phase multiplier for multiplying a MCPM signal by a scaling factor. The pre-processor also includes a frequency shifter for shifting the scaled MCPM signal to create a frequency offset. The pre-proc... | 08/19/2008 |
| 7412008 | Programmable phase mapping and phase rotation modulator and method A modulator (10) and method provides a programmable phase rotation for supporting different modulation formats and different phase rotations. The modulator (10) includes a programmable symbol counter (32) and symbol phase rotation logic (31 | 08/12/2008 |
| 7409012 | Modulator and signaling method Phase shift key modulators (100, 500, 1000, 1400, 1700) are provided in which a multiphase signal source (108, 1402, 1406-1412,1702) is used to generate a plurality of phases of a carrier signal. A selector (110) is used to select one pha... | 08/05/2008 |
| 7398075 | Radio wave reception device and radio wave clock In a radio wave reception device and a radio wave clock capable of receiving multiple frequencies, an intermediate frequency signal whose frequency is fixed can be output while a signal output from a local oscillation circuit (5) is fixed. ... | 07/08/2008 |
| 7394869 | RF transmitter architecture for continuous switching between modulation modes The present invention provides a radio transmitter having a digital modulator that further includes logic for continuous amplitude and continuous phase modulation switching in an RF transmitter intended to support both frequency shift keying (FSK) and phase shift ke... | 07/01/2008 |
| 7376117 | Interleaving circuit for a multiband OFDM transceiver Interleaving circuit for a multiband OFDM (orthogonal frequency division multiplexing) transceiver of a ultra wide band wireless personal access network transmitting OFDM modulated symbols, wherein each OFDM symbol consists of a predetermined number (NCBPS | 05/20/2008 |
| 7372908 | Radio communication method, radio transmitting apparatus, and radio receiving apparatus A duplicating section 11 duplicates a bit sequence to be input, and a 16QAM section 121 modulates a bit sequence of a duplicating source to form a symbol, a 16QAM section 122 modulates the duplicated bit sequence to form a symbol, an S/P section... | 05/13/2008 |
| 7362820 | Apparatus and method for modulating and digitally predistorting a signal in a multiple modulation schemes A programmable modulator (100) is programmable to operate in either of a GMSK or 8PSK mode. When operating in a GMSK mode, a signal modulating circuit 105 receives (210) a bit stream (110), maps the bit stream (110) to a phase valu... | 04/22/2008 |
| RE40255 | Communication system At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, two, first and second, data streams. The signal points are divided into signal point g... | 04/22/2008 |
| 7362813 | Communication system At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, two, first and second, data streams. The signal points are divided into signal point g... | 04/22/2008 |
| 7359457 | Transmission apparatus, reception apparatus and digital radio communication method A transmission apparatus includes a frame configuration determiner that determines a modulation system from among a plurality of modulation systems on a communication situation. A first symbol generator modulates a digital transmission signal according to the modula... | 04/15/2008 |
| 7359449 | Data communication for wired and wireless communication Data communication for wired and or for wireless communication and broadcasting systems for broadband, ultra wideband and ultra Narrowband (UWN) reconfigurable, interoperable communication and broadcasting system architectures. Combinations and hybrids of ultra wide... | 04/15/2008 |
| RE40206 | Communication system At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, two, first and second, data streams. The signal points are divided into signal point g... | 04/01/2008 |
| 7352797 | Procedure for BPSK modulation with reduced envelope peaking A system for and method of mapping successive bits of digital data into BPSK symbols using one or more BPSK symbol constellations such that orthogonal BPSK constellations are applied to successive bits of the digital data. The system and method may toggle between ap... | 04/01/2008 |
| 7342987 | 90-degree phase shifter The 90-degree phase shifter of the invention has: a T flip-flop including transistors Q3 to Q6 and Q9 to Q12 that together constitute a dual differential circuit, input transistors Q1 and Q2 that receive at their bases an in... | 03/11/2008 |
| 7340011 | Method of frequency multiplication in a radiocommunications apparatus Radiofrequency apparatus and method including at least one transmitter and/or receiver of a useful signal S0, at least one device adapted to the application of a coefficient N to the useful signal S0. The method includes modulating the useful s... | 03/04/2008 |
| 7336717 | Receiver circuit, in particular for a mobile radio A radio receiver with a low intermediate frequency has a first mixer stage that can be fed with a modulated input signal and at whose output a complex intermediate frequency signal can be derived. Connected downstream of the first mixer stage is a limiting amplifier... | 02/26/2008 |
| 7327778 | Multi-mok modulation/demodulation transmission process, corresponding transmitter and receiver A method and an apparatus for transmitting data using multi-MOK modulation/demodulation transmission process corresponding to transmitter and receiver are disclosed. At transmission, the data to be transmitted is divided into N data blocks. The N blocks are processe... | 02/05/2008 |
| 7315587 | Demodulation method and apparatus based on differential detection system for π/4 shifted QPSK modulated wave A demodulator of a differential detection system for a π/4 shifted QPSK or DQPSK modulation wave in digital communication. The demodulator includes a differential detector connected to receive orthogonal components of the modulation wave, a corrector connected to r... | 01/01/2008 |
