Did You Know...
...that when IBM conducted a market study of Chester Carlson's invention in 1959, the company concluded that it would take only 5000 units of his new product to saturate the market? IBM therefore declined to be part of the new product introduction. Too bad for IBM. Carlson's invention was the xerography process, and his new product was the beginning of the Xerox Corporation. It is estimated that every day, worldwide, 3,000,000,000 copies are made!!
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| Number | Title | Issue Date |
| 8139688 | Differential receiver with frequency offset compensation A differential receiver which provides for estimation and tracking of frequency offset, together with compensation for the frequency offset. Estimation and tracking of the frequency offset is undertaken in the phase domain, which reduces computational complexity and... | 03/20/2012 |
| 8098770 | Unbiased signal-to-noise ratio estimation for receiver having channel estimation error Apparatus and methods for estimating transmission noise in a programming information signal. Channel noise power in binary phase shift keying (“BPSK”) modulated telecommunication may be estimated. Such a method may include receiving over the channel a reference ... | 01/17/2012 |
| 8094755 | Ramping in multimode transmitters using primed filters A modulation system can switch between two modulation modes. In order to comply with limits on peak power in spectral bands outside the RF operating one the transmitter is required to ramp down to a condition of minimal power. To avoid fixed ramping and trailing bit... | 01/10/2012 |
| 8040979 | Generating a phase value for a complex signal A method of generating a phase value representative of a phase of a complex signal that includes an in-phase component and a quadrature-phase component includes determining a first sign for a first value and a second sign for a second value based on a quadrant occup... | 10/18/2011 |
| 8036319 | Direct conversion receiver and method for correcting phase imbalance therein A direct conversion receiver and a method for correcting phase imbalance including applying an input signal to an in-phase channel and a quadrature channel of the receiver. The input signal is processed by the receiver to obtain an in-phase zero intermediate frequen... | 10/11/2011 |
| 7970079 | Phase shift keying wireless communication apparatus and method A network device includes a first demodulation path to recover a header portion of a data packet. A second demodulation path recovers a payload portion of the data packet. The second demodulation path includes a down sampler to down sample a payload portion of the d... | 06/28/2011 |
| 7907684 | Signal regeneration Described herein is a method for signal regeneration, particularly, of the signal type transmitted by cellular base stations used in cellular telephone network systems. It is sometimes necessary to regenerate an accurate replica of a transmitted signal, by removing ... | 03/15/2011 |
| 7885363 | Correlation device and method for different modulated signals A correlation device and method for different modulated signals such as BPSK signal and BOC signal. According to the present invention, the correlation device has one or more sections. Each section comprises a correlation unit for executing correlation; a first sign... | 02/08/2011 |
| 7864893 | Decoder with soft decision combining A receiver including first circuitry configured to combine corresponding soft decision values from at least two groups of RDS/RBDS data transmitted as part of a broadcast channel to generate a set of combined values and second circuitry configured to identify a subs... | 01/04/2011 |
| 7864892 | Control method and apparatus for receiving optical signal A receiving/processing unit receives signals parallelized by a parallelizing unit, and executes a frame process including frame synchronization process on the signals. A phase comparing circuit and a phase judging circuit judge whether a bit delay is present based o... | 01/04/2011 |
| 7796710 | Digital signal demodulator and wireless receiver using the same A digital demodulator includes a resonator having a resonance frequency same as a carrier frequency to store a charge corresponding to a digital signal modulated by phase shift keying, a capacitor to store the charge of the resonator, an amplifier including an input... | 09/14/2010 |
| 7778360 | Demodulating a signal encoded according to ASK modulation and PSK modulation A system operable to demodulate a PSK-ASK encoded signal encoded according to ASK modulation and PSK modulation includes one or more inversion modulators. An inversion modulator receives an ASK-decoded signal generated according to a first signal split from the PSK-... | 08/17/2010 |
| 7773697 | Method to demodulate amplitude offsets in a differential modulation system Where the additional data throughput is added using an amplitude offset or a combination of phase and amplitude offset, the legacy differential demodulator does not recover the amplitude information. The present invention provides a method for demodulating amplitude... | 08/10/2010 |
| 7746960 | Apparatus and method for compensating for I/Q mismatch in TDD system Provided are an apparatus and a method for compensating for an I/Q mismatch using a transmission signal in a wireless communication system. The apparatus includes a coupler, an FFT operator, and an I/Q mismatch estimator. The coupler couples the transmission signal ... | 06/29/2010 |
| 7729455 | PSK receiver, PSK demodulating circuit, communication apparatus, and PSK receiving method A phase-shift keying (PSK) receiver includes a carrier wave generator generating a carrier wave, an extracting unit extracting an in-phase component I and a quadrature component Q from a received signal on the basis of the carrier wave and the received signal, a com... | 06/01/2010 |
| 7697639 | Apparatus and method for robust BPSK/QPSK blind modulation classification against errors in satellite control system Provided are an apparatus and method for robust Binary Phase Shift Keying/Quadrature Phase Shift Keying (BPSK/QPSK) blind modulation classification. The apparatus includes first and second likelihood value calculators for calculating a likelihood value of a received... | 04/13/2010 |
| 7697638 | Modulation detection in a SAIC operational environment Blind modulation detection in a receiver of a wireless communication device calculates error energies for PSK and GMSK based on differences between a received training sequence signal and synthesized training signals generated from PSK and GMSK channel estimations a... | 04/13/2010 |
| 7688918 | Recursive phase estimation for a phase-shift-keying receiver In one embodiment, a receiver of the invention has a detector coupled to a digital processor. The detector is adapted to mix the received PSK signal with a local oscillator (LO) signal having a time-varying phase offset with respect to the carrier frequency of the P... | 03/30/2010 |
| 7660367 | Base station using a multicarrier communication band divided into a plurality of blocks It is possible to use a frequency of a preferable propagation condition while reducing the other cell interference by hopping. A scheduler section (102) performs scheduling for deciding a user to whom data is transmitted, by using the CQI from each communicat... | 02/09/2010 |
| 7639759 | Carrier to noise ratio estimations from a received signal Techniques for measuring the carrier to noise ratio (CNR) in a received digital signal are disclosed. The methods can operate on a received digital signal, such as a layered modulation signal used in a satellite television system. The CNR measurement can be made at ... | 12/29/2009 |
| 7639758 | Blind detection of BPSK signals in a multi-user environment The present invention relates to a system and method for the blind detection of BPSK signals in a multi-user environment. More particularly, the present invention provides a system and a method for blind detection of BPSK signals in an environment with multiple simu... | 12/29/2009 |
| 7616709 | Differential decoder followed by non-linear compensator A receiver including a (differential-quadrature-) phase-shift-keying demodulator (4) and a differential detector (10) having a decoder (19), is provided with a non-linear compensator (20) for compensating the decoder output siqnal for (pa... | 11/10/2009 |
| 7609784 | Signal decoding method and apparatus with dynamic noise threshold An apparatus and method for use by a receiver in decoding information sent by phase-shift keying over a carrier frequency for use with power line carrier (PLC) applications as it is adapted to appropriately position the sampling window based on a zero crossing of on... | 10/27/2009 |
| 7564929 | System for coherent demodulation of binary phase shift keying signals (BPSK) A system for the coherent demodulation of Binary Phase Shift keying (BPSK) signal at a frequency f, includes recovering a carrier signal (C) at a frequency 2f from the BPSK signal; injecting the signal having a frequency 2f in an injection locking oscillator (ILO), ... | 07/21/2009 |
| 7529321 | Radio digital signal receiver A digital satellite broadcast receiver capable of an optimum signal reception even when an arbitrary outdoor unit is connected. Please noise characteristics of an outdoor unit connected to a digital satellite broadcast receiver when receiving a burst symbol is estim... | 05/05/2009 |
| 7519134 | Method and apparatus to determine phase difference between a received analog signal and a reference signal based upon a local oscillator An apparatus and method for use by a receiver in decoding information sent by phase-shift keying over a carrier frequency is disclosed. The method is well suited for use with power line carrier (PLC) applications as it is adapted to appropriately position the sampli... | 04/14/2009 |
| 7499506 | Detection of signal modulation format type A biasing algorithm, apparatus and method for detecting and modulation format of a received signal used in a mobile phone system implementing EDGE technology that transmits and receives both GMSK and 8PSK modulated signals. The biasing method and apparatus may also ... | 03/03/2009 |
| 7463701 | Fast symbol timing recovery for transmitted digital data A system and method of recovering symbol timing from a high symbol rate TDD or TDMA broadband transmission. A correlator operating at a fraction of the symbol rate receives in-phase and quadrature data signals from a broadband demodulator and processes those signals... | 12/09/2008 |
| 7440519 | Algorithm for multiple-symbol differential detection A method for differential phase evaluation of M-ary communication data is employed in which the data consists of N sequential symbols r1 . . . rN, each having one of M transmitted phases. Selected sequences of N−1 elements that represent poss... | 10/21/2008 |
| 7440516 | Apparatus and method for receiving digital multimedia broadcasting in a wireless terminal Provided are an apparatus and method for receiving digital multimedia broadcasting (DMB) signals in a wireless terminal. The apparatus includes a first antenna for receiving a satellite DMB signal and a first terrestrial DMB signal, a second antenna for receiving a ... | 10/21/2008 |
| 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 |
| 7430402 | Frequency error estimation and correction Counter-clockwise and clockwise quadrant transitions are detected and accumulated with respect to a received complex signal over a certain time period. These transitions may then be compared in order to obtain information indicative of both a magnitude and phase of ... | 09/30/2008 |
| 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 |
| 7428272 | Method and apparatus for joint phase offset and frequency offset estimator for MPSK transmission Disclosed are a method and an apparatus for joint phase and frequency offset estimator for an MPSK transmission, in which the overall observation interval is divided into adjacent sub-intervals and a folded separate phase estimate is independently obtained from each... | 09/23/2008 |
| 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 |
| 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 |
| 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 |
| 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 |
| 7409015 | Adaptive modulation scheme based on cutoff rate with imperfect channel state information A cutoff rate may be used to determine an optimal binary input distribution for a communications system which operates with imperfect receiver channel state information (CSI) at the receiver. First, the cutoff rate may be evaluated and used to analyze the optimal bi... | 08/05/2008 |
| 7388934 | Detection and correction of phase jumps in a phase sequence According to one example embodiment, a communication system includes a transmitter and a receiver for receiving symbols from a phase-shift shift keying modulation. The system also includes estimation means for estimating a frequency error relating to a symbol based ... | 06/17/2008 |
