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| Number | Title | Issue Date |
| 7907685 | GMSK-receiver with interference cancellation A GMSK receiver with interference cancellation includes a linear equalizer configured to be coupled to a received signal from a first antenna and to provide first soft bits, an adaptive estimator, e.g., adaptive MLSE coupled to the first soft bits and configured to ... | 03/15/2011 |
| 7593487 | Non-redundant differential MSK demodulator with double error correction capability A non-redundant differential MSK demodulator with double-error correction capability includes a differential detection stage, an error signal generator stage, and an error detection-and-correction stage. Differential detectors receive modulated MSK input. The error ... | 09/22/2009 |
| 7570719 | Receiver and a receiving method A receiver for receives transmitted signals and each transmitted signal contains at least two known portions which are spaced from one another in the signal and at least one other portion. The receiver comprises channel estimation means for estimating a channel base... | 08/04/2009 |
| 7460618 | System and method for obtaining accurate symbol rate and carrier phase, frequency, and timing acquisition for minimum shift keyed waveform The present invention relates generally to communication systems, both wired and wireless, employing a continuous phase modulation (“CPM”) waveform with a minimum shift keying (“MSK”) preamble. The present inventive system and method uses information from co... | 12/02/2008 |
| 7336749 | Statistical margin test methods and circuits Margin-testing circuits and methods rely upon the statistics of sampled data to explore the margin characteristics of received data. One margining circuit samples an incoming data stream N times at each of many sample points, each sample point representing a unique ... | 02/26/2008 |
| 7295630 | Receiver having a variable threshold slicer stage and a method of updating the threshold levels of the slicer stage A receiver having a variable bit slicer for detecting bits in a demodulated signal, comprises a demodulator (14) for deriving a demodulated bit rate signal, means (36) for storing a plurality of threshold values, each of the threshold values being sele... | 11/13/2007 |
| 7260160 | Method and apparatus for decoding GPS satellite data at low signal to noise levels A method of decoding a received phase modulated carrier signal comprising the following steps: (A) computing a total probability of a current data bit being “one” or “zero” at a time epoch by computing a plurality of probabilities of phase transitions at a p... | 08/21/2007 |
| 7248630 | Adaptive equalizer operating at a sampling rate asynchronous to the data rate The invention relates to an LMS-based asynchronous receiver for digital transmission and recording systems. The receiver comprises a digital adaptive equalizer (EQ) for receiving a received sequence rn and for delivering an equalized sequence yn. The equalizer (EQ) ... | 07/24/2007 |
| 7236762 | Direct-conversion receiver system and method, especially a GPS receiver system with high pass filtering The invention relates to a direct conversion receiver and a method in a direct conversion receiver for processing received radio signals that are modulated and centered at a carrier frequency, the modulation extending a sideband above and below the carrier frequency... | 06/26/2007 |
| 7233368 | Down-converter A down-converter for processing frequency signals, preferably received, particularly digital, television signals, comprising two, preferably identical mixer stages (10a, 10b) for down-converting the signal, a local oscillator (12) ... | 06/19/2007 |
| 7209433 | Channel estimation and compensation techniques for use in frequency division multiplexed systems Methods and apparatus for performing channel estimate updates in frequency division multiplexed, e.g., (OFDM), systems are described. After generation of initial channel estimates from received pilots, channel estimates corresponding to individual tones are updated ... | 04/24/2007 |
| 7203494 | Optimizing radio communication efficiency and methods thereof A selective call radio (106) operating in a communication system (100) including a plurality of radio base stations (104) operating in a corresponding plurality of communication zones (102), wherein the selective call radio is programmed ... | 04/10/2007 |
| 7190722 | Ultra-wideband pulse modulation system and method An ultra-wideband pulse modulation system and method is provided. One method of the present invention includes transforming data into a ternary data set with data being represented with states of zero, positive one and negative one. The modulation and pulse transmis... | 03/13/2007 |
| 7173957 | Efficient epoch processing in multichannel global positioning system signal receiver One embodiment of the present invention includes a first memory, an address counter, and an adder. The first memory having KN locations stores K sums of mixer samples during an epoch interval. The mixer samples are generated at a first clock frequency from a mixer f... | 02/06/2007 |
| 7173890 | Wobbling signal demodulation method, wobbling signal demodulation circuit, and optical disk drive A wobbling signal demodulation method is disclosed that is capable of fast and precisely demodulating a wobbling signal without increasing cost of the circuit. The wobbling signal is obtained based on light reflected from a recording surface of an optical disk havin... | 02/06/2007 |
| 7158588 | System and method for obtaining accurate symbol rate and carrier phase, frequency, and timing acquisition for minimum shift keyed waveform The present invention relates generally to communication systems, both wired and wireless, employing a continuous phase modulation (“CPM”) waveform with a minimum shift keying (“MSK”) preamble. The present inventive system and method uses information from co... | 01/02/2007 |
| 7142622 | Multiplying phase detector for use in a random data locked loop architecture A multiplying phase detector includes a 1st multiplier, a 2nd multiplier and a phase error generation module. The 1st multiplier is operably coupled to multiple an incoming data stream, which is a random data pattern, with a 1st... | 11/28/2006 |
| 7142595 | System and method for decreasing cross-talk effects in time-domain-modulation (TDM) digital subscriber line (DSL) systems A communications system may be characterized by a system error variance because the error variance provides an indication of signal corruption in the system. By strategically adding a secondary sensor to the communications system, system characteristics may be alter... | 11/28/2006 |
| 7116964 | Signal reception and processing method for cordless communications systems Channel selection of a received signal is first of all carried out, in the process, by way of an analog channel selection filter. The signal is then converted to a digital discrete-time and discrete-value signal. Finally, the continuous-time and continuous-value sig... | 10/03/2006 |
| 7092463 | Method and apparatus for interference rejection The invention relates to an apparatus, and an associated method, in a communication system that is tolerant to interference. The received signal is divided into a real and an imaginary part, and the noise and interference is modeled as a filtered process. The invent... | 08/15/2006 |
| 7072414 | Gaussian minimum shift keying (GMSK) precoding communication method A premodulation precoding method precodes a data sequence in a Gaussian minimum shift keying (GMSK) modulator to improve the bit error rate performance of a coherent Viterbi receivers generating estimates of the communicated data sequence without the use of differen... | 07/04/2006 |
| 7065157 | GMSK modulation techniques This disclosure is directed to digitally implemented GMSK modulation techniques. The digital GMSK modulation techniques make use of a lookup table (LUT) and mapping logic to digitally generate GMSK waveforms. The mapping logic can significantly reduce the size of th... | 06/20/2006 |
| 7049964 | RFID readers and tags transmitting and receiving waveform segment with ending-triggering transition RFID readers exchange information with RFID tags. The information is encoded for transmission and decoded upon reception. Encoding is in binary bits, which are in turn encoded in waveform segments. The last transmitted waveform incorporates an ending-triggering tran... | 05/23/2006 |
| 7035245 | Methods and apparatus for multiplexing signal codes via weighted majority logic CDMA codes are multiplexed into a constant-envelope composite signal using weighted majority logic. Based on a commanded power allocation among the signal codes, each signal code is assigned a weighting coefficient dictating the voting power the signal code has each... | 04/25/2006 |
| 7035354 | CDMA multi-user detection with a real symbol constellation A method for multi-user detection includes receiving a complex input signal due to a superposition of waveforms encoding symbols in a real-valued constellation, which are transmitted respectively by a plurality of transmitters in a common frequency band. The complex... | 04/25/2006 |
| 7032150 | Method and apparatus for measuring group delay of a device under test In a method of measuring group delay (Tgd) of a device under test, an analog input signal having a predetermined period (T) is provided to the device under test so as to obtain a delayed output signal from the device under test. A phase difference is dete... | 04/18/2006 |
| 7027534 | Extracting fine-tuned estimates from correlation functions evaluated at a limited number of values Techniques are provided for fine-tuning estimates of a delay value for a sampled signal. One aspect of the invention is to perform, for the sampled signal, coarse-grained calculations of the In Phase and Quadrature (I and Q) correlation integrals at a limited number... | 04/11/2006 |
| 7024599 | System and method for non-causal channel equalization A system and method are provided for non-causal channel equalization in a communications system. The method comprises: receiving a non-return to zero (NRZ) data stream input; establishing thresholds to distinguish a first bit estimate; comparing the first bit estima... | 04/04/2006 |
| 7006565 | Hybrid soft and hard decision feedback equalizer An equalizer for use in a communication receiver includes an infinite impulse response (IIR) feedback filter operated in acquisition and tracking feedback modes on a sample by sample basis to form a hybrid Decision Feedback Equalizer (DFE) architecture. In acquisiti... | 02/28/2006 |
| 6999548 | Communication channel detector and channel detection method A communications channel detector which determines the availability of a desired type of communications channel in a communication system having at least one communications channel, the communications channels including data streams comprising a number of data symbo... | 02/14/2006 |
| 6996080 | Chip-synchronous CDMA multiplexer and method resulting in constant envelope signals A multiplexer and a method for chip-synchronous code-division multiple access (CDMA) signals produces a constant envelope signal. The output signal of the multiplexer permits use of a saturating (Class C) high power amplifier (HPA) resulting in a net increase in eff... | 02/07/2006 |
| 6968017 | Low phase noise frequency converter One aspect of the present invention is a frequency conversion circuit having a pair of local oscillators. The local oscillators are frequency synthesizers based on an external frequency reference. The frequency conversion circuit is configured to perform a frequency... | 11/22/2005 |
| 6959010 | Method and radio station for data transmission In the novel method for data transmission via a radio interface in a radio communications system, at least two data channels are assigned to one connection. Each data channel can be distinguished by an individual spread code. In addition to data symbols, midambles w... | 10/25/2005 |
| 6934327 | Acquisition of a continuous-phase modulation waveform Acquisition of a waveform such as a continuous-phase modulation (CPM) waveform is described. In one embodiment of the invention, the invention is directed to a method and apparatus for acquiring a waveform as defined by MIL-STD-188-181B including the preamble of suc... | 08/23/2005 |
| 6920189 | Carrier recovery means The present invention relates to a carrier recovery means in particular in a channel decoding unit or a digital demodulating unit of a digital broadcasting receiver. The inventive carrier recovery means comprises at least first and second phase error detecting means... | 07/19/2005 |
| 6879647 | Radio receiver AM-MSK processing techniques A radio receiver (10) adapted to receive an AM-MSK modulated carrier signal includes an envelope detector (24) and a transformer (28) which restores the real signal to complex MSK format. A Doppler remover (34) removes any Doppler shift o... | 04/12/2005 |
| 6711218 | System and method for received signal decoding A system and method for sequence estimation decoding allows a receiver to decode a received signal modulated according to one of plurality of possible modulating methods. In a preferred approach, a sequence estimation decoder detects the modulating method that was a... | 03/23/2004 |
| 6411661 | Digital timing recovery loop for GMSK demodulators A GMSK timing recovery loop in a receiver of a Gaussian Minimum Shift Keying (GMSK) link with a low channel Bit Signal-to-Noise Ratio (BSNR) and a small bandwidth-bit period BT product in a high bandwidth efficiency channel, includes a hard limiter for co... | 06/25/2002 |
| 6323727 | Apparatus and method for detecting digital FM A symbol detector for frequency modulated (FM) symbols includes a section determiner, a direction of movement determiner and a data symbol determiner. The section determiner receives a sample of in-phase and quadrature signals associated with a baseband t... | 11/27/2001 |
| 6160858 | MSK signal processing in a GPS correlator channel A method and apparatus for demodulating and decoding an MSK signal utilizing synchronous accumulation and simultaneous synchronization of reference carrier and MSK data clocks enables a GPS correlator channel in a multi-channel GPS receiver to be used for... | 12/12/2000 |
