Abstract: The present invention has an object for setting thermal resistance corresponding to a contact condition of a contact face between two elements automatically and generating analysis data including a thermal conductivity of the contact face accurately in a short time when analysis data is generated based on three-dimensional design data of an object formed by a plurality of elements. An apparatus according to the present invention includes a retaining unit for retaining thermal resistance information for obtaining thermal resistance of the contact face in accordance with contact condition of the contact face; a thermal conductivity calculating unit for calculating a thermal conductivity of the contact face based on the thermal resistance information which is retained in the retaining unit and corresponds to the contact condition of the contact face set by a contact condition setting unit; and a generating unit for generating the analysis data including the thermal conductivity.

Abstract: The electronic thermometer of this invention includes a supporting portion which supports the vicinity of the periphery on one face of a vibration plate, and a buzzer cover having plasticity of pressing the vibration plate against the supporting portion by pressing the vicinity of the periphery of the other face of the vibration plate and further includes a mechanism which presses the vicinity of the center of the buzzer cover on an opposite side to a side provided with the vibration plate in the buzzer cover so as to flex the buzzer cover, thereby pressing the vicinity of the periphery on the other face of the vibration plate with elastic reaction force of the buzzer cover.

Abstract: The invention relates to a remotely interrogable SAW (surface acoustic wave) temperature sensor comprising, on the surface of a quartz substrate cut along the direction Y? making an angle ? with the direction Y, at least two resonators (T1,SAW, T2,SAW) comprising transducers consisting of interdigitated electrodes connected to control buses of design such that they have different characteristic operating frequencies; and a first resonator having a first surface acoustic wave propagation direction, parallel to one of the axes of the substrate, and a second resonator having a surface acoustic wave propagation direction making a nonzero angle (0) with the propagation direction of the first resonator, characterized in that the control buses of the second transducer are inclined at a nonzero angle (?) to the normal to the interdigitated electrodes of said second transducer so as to compensate for the power flow divergence of the acoustic waves relative to the direction of propagation of the surface acoustic waves

Abstract: A radio communication apparatus for performing transmission and reception of radio communications simultaneously by using different carrier frequencies for transmission and reception, comprising: a transceiver having a coupling loop interference signal removal function for analog domain and/or a coupling loop interference signal removal function for digital domain, for removing a coupling loop interference signal contained in a signal; and a power suppressor for coupling loop interference signal for attenuating the signal power in order to suppress the coupling loop interference signal power that is contained in the signal.

Abstract: A wireless spread-spectrum communication system for transmitting data includes a plurality of end point transmitters and at least one receiver. The end point transmitters transmit data via a frequency-hopped spread-spectrum signal where the transmitting signal is sent without the benefit of frequency stabilization. The receiver is responsive to the frequency-hopping spread-spectrum signals and includes a correlator and a signal processor. The correlator samples at least a first portion of a preamble of the signal and correlates the portion of the preamble with a known preamble pattern to determine a probability of correlation. The signal processor applies a Fast Fourier Transform algorithm to the signal in response to the probability of correlation to track a narrowband frequency of the signal based on at least a second portion of the preamble and to decode data encoded within the signal subsequent to the preamble.

Abstract: A method and apparatus for computing a convolution between a satellite signal from one of a plurality of satellite positioning systems and a pseudorandom code reference. The method and apparatus is capable of operating in multiple modes of resolution so as to enhance the sensitivity of the convolution processing.

Abstract: This invention is directed to a method for estimating and compensating for multipath errors in a pseudorandom noise ranging receiver. The method exploits the asymmetry of the correlation function and proportionately relates it to the magnitude of multipath error. In a pseudorandom noise ranging receiver, the correlation function is obtained by generating the local pseudorandom noise sequences at different programmed non-uniform phases resulting in non-uniformly spaced correlators. Numerically controlled oscillators, code generators and shift registers are programmed to determine the correlation values at non-uniformly distributed points on a correlation function. Curve fitting is undertaken to determine the code phase at which the correlation function peaks. A proportionality constant is applied to the measure of asymmetry of the correlation function to determine the multipath error in the pseudorandom noise signal. A filter is used to detect and eliminate outliers.

Abstract: A time shift apparatus and method for a digital multimedia broadcasting (DMB) terminal are disclosed wherein bookmarks are automatically placed at individual programs during time-shift recording of broadcast data, thereby enabling movement between programs. A broadcast data recording method comprises performing, in response to a request for a time-shift/bookmark operation during reception of DMB broadcast data, a time-shift operation; finding start times of individual programs in the broadcast data during the time-shift operation; and inserting a bookmark at each program and storing the broadcast data.

Abstract: An apparatus for estimating a RSSI of a signal transmitted/received in a wireless network, the apparatus including an ADC quantizing one of I-branch and Q-branch signals, extracted from the signal, into a digital signal; an absolute value calculating unit calculating an absolute value of the digital signal quantized by the ADC and outputting a result; an accumulate unit accumulating an output of the absolute calculating unit for a given time period and outputting a result; a square unit squaring an output of the accumulate unit and outputting a result; and a multiply unit multiplying an output of the square unit by a given value and outputting a result, the given value being determined based on the number of input bits, an input clip level, and input resistance of the ADC when the probability density functions at input and output signals of the ADC are approximately Gaussian with zero mean.

Abstract: A method to determine bit error rate (BER) for a given channel of a communication system includes determining a first statistical representation of at least one deterministic source of noise for the given channel. A parametric statistical representation having parameters that model non-deterministic noise is defined for the given channel and values for the parameters of the parametric statistical representation are estimated to provide a second statistical representation for the non-deterministic noise based on at least one of measurements and simulations performed for the given channel. The BER of the given channel is estimated as a function of the first and second statistical representations.

Abstract: Various embodiments are disclosed relating to crosstalk emission management. In an example embodiment, an amplitude of a main tap of a transmit equalizer may be determined to limit crosstalk emitted from a local channel to one or more other channels to be less than a threshold. A ratio of an amplitude of at least one secondary tap of the transmit equalizer to the amplitude of the main tap may be determined to provide equalization to the local channel.

Abstract: A method and system for video compression prediction mode determination is disclosed. For one embodiment of the invention, the frequency domain characteristics (FDCs) of an image block are determined. The FDCs of the image block are compared to the FDCs of each of a number of prediction modes. The prediction mode having FDCs most similar to those of the image block is then determined and selected for encoding the block. For one embodiment of the invention the FDCs of the nine 4×4 prediction modes of the H.264 standard and the FDCs of a 4×4 image block are defined using a frequency domain transform. For one embodiment of the invention, one or more additional prediction modes are evaluated, and of these, the prediction mode resulting in RD optimization is selected for encoding the block.

Abstract: A wireless multimedia communication method for improving wireless video transmission quality by using physical layer channel status information (CSI) in a video application layer. In this method, the transmitting end decides the maximum transmission rate (Rmax) of the system based on both SNR information of receiving antennas fed back from the receiving end and a bit error rate required by the system. At the same time, a hierarchical encoding method is used, in the video application layer, to divide a bit stream into a basic layer and an expansion layer. In a case of employing an FGS encoding method, the transmission is caused to start with the basic layer, and the number of bits is increased in the expansion layer just until the bit rate of the video stream has become below Rmax.

Abstract: A video compression routine encodes pixels using frame location relationships by using packets with variable length opcode.

Abstract: A method for encoding a digital signal into a scalable bitstream comprising quantizing the digital signal, and encoding the quantized signal to form a core-layer bitstream, performing an error mapping based on the digital signal and the core-layer bitstream to remove information that has been encoded into the core-layer bitstream, resulting in an error signal, bit-plane coding the error signal based on perceptual information of the digital signal, resulting in an enhancement-layer bitstream, wherein the perceptual information of the digital signal is determined using a perceptual model, and multiplexing the core-layer bitstream and the enhancement-layer bitstream, thereby generating the scalable bitstream.

Abstract: Rate control mechanisms for video encoding aim to provide the best possible video quality while keeping given conditions on transmission rate and decoding delay. In order to achieve a constant video quality, the anchor and non-anchor frames of different frame types are encoded using a different number of bits. However, since video sequences generally contain widely varying picture content and previously coded frames are used to predict a given frame, a suitable assignment of frame target bit rates is hard to determine, especially for non-anchor frames. According to the invention, non-anchor frames are coded using a fixed quantisation parameter. Since the quantisation parameter used for the encoding of non-anchor frames is directly derived from the average quantisation parameter of the previously encoded anchor frame, such approach ensures a constant video quality.

Abstract: A system and method for on-the-fly detection of scene changes within a video stream through statistical analysis of a portion of the macroblocks comprising each video frame as they are processed using inter-frame coding. If the statistical analysis of the selected macroblocks of the current frame differs from the previous frame by exceeding predetermined thresholds, the current video frame is assumed to be a scene change. Once a scene change is detected, the remainder of the video frame is encoded as an intra-frame, intra-macroblocks, or intra slices, through implementation of one or more predetermined or adaptively adjusted quantization parameters to reduce computational complexity, decrease power consumption, and increase the resulting video image quality. As decoding is the inverse of encoding, these improvements are similarly recognized by a decoder as it decodes a resulting encoded video stream.

Abstract: The presently claimed invention relates generally to monitoring and/or filtering video or audio data. In one implementation a method is provided including: obtaining data representing video or audio; analyzing the data representing video or audio for an in-band signal, the in-band signal encoded in data representing video picture elements or in data representing audio elements; looking for out-of-band data conveyed with the data representing video or audio; restricting or allowing distribution of the data representing video or audio based at least in part on a result of the act of analyzing and a result of the act of looking. In some implementations the in-band signal includes steganographic encoding or digital watermarking. Of course, other implementations and embodiments are provided.

Abstract: A telop detecting device includes an MPEG input source, a parameter acquiring unit, a switch, a DCT coefficient evaluating unit, and a result output unit. The MPEG input source acquires an MPEG stream. The parameter acquiring unit acquires parameters necessary for detecting a telop from the MPEG input source. The switch switches on and off the connection to the DCT coefficient evaluating unit. The DCT coefficient evaluating unit evaluates the possibility of presence of a telop based on a DCT coefficient of each macro block in a frame acquired through the switch, identifies a telop region by calculating an evaluation value by assigning a weight to the DCT coefficient using a weighting matrix.

Abstract: Provided is a method of encoding FGS layers by using weighted average sums. Method includes calculating a first weighted average sum by using a restored block of nth enhanced layer of a previous frame and a restored block of a base layer of a current frame; calculating a second weighted average sum by using a restored block of nth enhanced layer of a next frame and a restored block of a base layer of the current frame; generating a prediction signal of nth enhanced layer of the current frame by adding residual data of (n?1)th enhanced layer of the current frame to a sum of the first weighted average sum and the second weighted average sum; and encoding residual data of nth enhanced layer, which is obtained by subtracting the generated prediction signal of nth enhanced layer from the restored block of nth enhanced layer of the current frame.

Abstract: A method and apparatus for encoding/decoding a multi-layer interlaced video signal having macroblocks coded in an interlaced manner is provided. The method includes determining whether a pair of macroblocks of a current layer are of a frame type and a corresponding pair of macroblocks of a lower layer are of a field type; and predicting and encoding a macroblock of the current layer by interpolating information of the top or bottom field of a corresponding macroblock of the lower layer, if the pair of the macroblocks of the current layer are of the frame type and the corresponding pair of the macroblocks of the lower layer are of the field type, and the top and bottom fields of the corresponding pair of the macroblocks of the lower layer have been coded in different prediction modes.

Abstract: A circuit which performs a block motion estimation procedure disclosed. The patterns are based on genetic competition between paired coordinate points. An evaluation of a block matching cost is used to identify a survivor between the two selected points. Models are also provided for estimating performances of new search algorithms and image sequences.

Abstract: A method for memory management in video decoding systems that avoids some of the costs and disadvantages with video decoding systems in the prior art. Some embodiments of the present invention are especially well-suited for use with the H.264 video decoding standard. The illustrative embodiment is a memory management technique that controls which data is in the fastest memory available to a processor performing video decoding. In particular, the technique seeks to ensure that the data the processor will need is in the primary memory and expunges data that the processor will not need. The technique is based upon an analysis of predictive video decoding standards, such as H.264. By employing this technique, the illustrative embodiment ensures the expedient decoding of video frames.

Abstract: A pattern-search based method and apparatus for context-adaptive variable length coding/decoding (CAVLC/CAVLD) is provided. The method analyzes the correlation between bit patterns and blocks. Before CAVLD, a step of bit-stream pattern search is conducted. If a pattern is matched in a look-up table, this invention skips the CAVLD procedure and reconstructs a block directly. Before CAVLC, a step of zig-zag ordered coefficients search is conducted. If a sequence of zig-zag ordered coefficients is matched in a look-up table, a corresponding coded bit-stream can be obtained directly. Compared with the standard CAVLD procedures, this invention improves about 10% performance in memory access speed.

Abstract: A moving image encoding method of the present invention is a moving image encoding method for encoding a moving image while switching between variable-length encoding schemes. In this method, a continuous unit to be continuously reproduced is determined (S5201); a stream is generated by encoding the moving image without switching between variable-length encoding schemes in the continuous unit (S5202); and management information is generated that includes a first flag information indicating that a variable-length encoding scheme is fixed in the continuous unit (S5204, and S5205).

Abstract: A method and apparatus for variable accuracy inter-picture timing specification for digital video encoding is disclosed. Specifically, the present invention discloses a system that allows the relative timing of nearby video pictures to be encoded in a very efficient manner. In one embodiment, the display time difference between a current video picture and a nearby video picture is determined. The display time difference is then encoded into a digital representation of the video picture. In a preferred embodiment, the nearby video picture is the most recently transmitted stored picture. For coding efficiency, the display time difference may be encoded using a variable length coding system or arithmetic coding. In an alternate embodiment, the display time difference is encoded as a power of two to reduce the number of bits transmitted.

Abstract: A method and apparatus for variable accuracy inter-picture timing specification for digital video encoding is disclosed. Specifically, the present invention discloses a system that allows the relative timing of nearby video pictures to be encoded in a very efficient manner. In one embodiment, the display time difference between a current video picture and a nearby video picture is determined. The display time difference is then encoded into a digital representation of the video picture. In a preferred embodiment, the nearby video picture is the most recently transmitted stored picture. For coding efficiency, the display time difference may be encoded using a variable length coding system or arithmetic coding. In an alternate embodiment, the display time difference is encoded as a power of two to reduce the number of bits transmitted.

Abstract: In a system and method for coding moving pictures, the cost of skip mode is estimated to determine the best coding mode. Skip mode selection within the framework of the AVC standard is improved by complexity based threshold determination, penalty modulation level adjustment and bias modulation level adjustment for the encoding mode selection.

Abstract: The present invention is directed to a method of processing a video signal. The method includes the video signal being split into a low frequency signal and a high frequency signal. The low frequency signal being processed to reduce ringing artifacts. The high frequency signal being processed to reduce blocking artifacts. Further, the low frequency signal and high frequency signal being combined.

Abstract: A method of parallelizing the prediction of H.264 luma blocks is disclosed. The illustrative embodiment, for example, enables the prediction of H.264 luma blocks to be performed in parallel on a single-instruction, multiple-data processor so that any two—and up to all 16 pixels—can be set simultaneously in different execution units. This is very fast and economical. The invention of formulas for enabling the parallelization of the H.264 luma blocks is noteworthy because of the diversity in the structures of the formulas for predicting the various pixels given by the H.264 standard. For example, the standard specifies fundamentally different formulas for some pixels than for others, which makes their parallelization appear impossible.

Abstract: A receiving apparatus (100) includes demodulation parts (101, 102) for receiving the respective one of received signals of broadast systems to output demodulated data and timing clocks synchronized with the respective demodulated data, a clock generating part (103) for outputting, to an A/V decoder (107), the two timing clocks from the demodulation parts (101, 102) as high-rate and low-rate timing clocks and for outputting a control signal for multiplexing the two demodulated data from the demodulation parts (101, 102), and a multiplexing part (104) for multiplexing, based on the control signal, the two demodulated data to output the multiplexed data to the A/V decoder (107). The A/V decoder (107) receives the multiplexed data and timing clocks from the receiving apparatus (100) to process the video/audio signals of each broadcast.

Abstract: There is provided with an apparatus including: a video stream receiver configured to receive a first video stream encoded by a first coding scheme from a video providing apparatus via a network; a video stream generator configured to generate a second video stream obtained by converting a coding scheme of the first video stream from the first coding scheme to a second coding scheme; a client capability information acquirer configured to acquire decoding capability information representing whether a client apparatus can decode a video image encoded by the first coding scheme; and a video stream processing determiner configured to transmit the first video stream to the client apparatus when the client apparatus can decode the video image encoded by the first coding scheme, and configured to transmit the second video stream to the client apparatus when the client apparatus cannot decode the video image encoded by the first coding scheme.

Abstract: A DTV transmitting system includes a frame encoder, a randomizer, a block processor, a group formatter, a deinterleaver, and a packet formatter. The frame encoder builds an enhanced data frame and adds parity data into the data frame. The frame encoder further divides the data frame into first and second sub-frames including first and second portions of the parity data, respectively, and permutes a plurality of the first sub-frames and a plurality of the second sub-frames, respectively. The randomizer randomizes enhanced data in the permuted sub-frames, and the block processor codes the randomized data at a rate of 1/N1. The group formatter forms a group of enhanced data having one or more data regions and inserts the 1/N1 coded data into at least one of the data regions. The deinterleaver deiniterleaves the group of enhanced data, and the packet formatter formats the deinterleaved data into enhanced data packets.

Abstract: A method for motion detection includes capturing a plurality of frame images. The plurality of frame images is preprocessed. A first background reference is generated based on a first subset of the plurality of frame images. A second background reference is generated based on a second subset of the plurality of frame images, wherein the second subset of the plurality of frame images is a subset of the first subset of the plurality of frame images. A first motion result is generated based on the first background reference and a second motion result is generated based on the second background reference. The first motion result and the second motion result are combined to generate a combined result. Object motion is detected based on the combined result.

Abstract: Disclosed is a method for constituting a layered cell, which is for constituting a cell in an OFDMA (Orthogonal Frequency Division Multiple Access) mobile communication system. The method includes: (a) dividing L carriers having orthogonality into M sub-channels; (b) dividing the carriers into N groups each having the M sub-channels; (c) grouping the N groups by an arbitrary integer into K classes; and (d) constituting a plurality of layered cells corresponding to the K classes. According to the present invention, the conception of the independent classes is introduced for a plurality of carriers to facilitate the use of the carriers to a system requiring an independent wireless area, allowing design of sectors and cells at a single frequency.

Abstract: A method for distributed spectrum management of digital communication systems having a plurality of communication lines on which signals are transmitted and received by respective users, the method comprising the steps of: collecting information about line, signal and interference characteristics of a plurality of the communication lines from a plurality of sources; determining the line, signal and interference characteristics of a plurality of the communication lines; varying power allocation of particular plurality of the communication lines between respective transmitter and receiver taking into consideration the determined line, signal and interference characteristics of a plurality of the communication lines and consideration of a noise weight of a plurality of the communication lines to enable a minimum power on a plurality of the communication lines and to allow required effective data-rates for each of said respective users to be satisfied.

Abstract: A tuner selects a channel in a designated frequency band. An FFT circuit converts a received signal in the selected channel into a plurality of carrier signals. A carrier shift detection circuit calculates the correlation between the phase information of each carrier signal and reference phase information prepared in advance. If the correlation is larger than a given threshold, it is determined that an OFDM signal is present in the search target channel. A TMCC extraction circuit analyzes the TMCC of the received signal and determines whether or not digital broadcasts of the search target channel can be received.

Abstract: A carrier interpolation unit (a digital filter) performs interpolation processing of SP signal in the frequency domain. An IFFT circuit converts a frequency-domain signal into a time-domain signal. A delay profile generation unit generates a delay profile based on an output of the IFFT circuit. The filter control unit controls a pass band of the digital filter in accordance with the delay profile. An FFT window control unit controls a position of a window to extract a calculation range of FFT in accordance with the delay profile. When delay time of multipath is larger than the guard interval, and when the reception power of the interference wave is larger than a threshold, the pass band of the digital filter is minimized.

Abstract: A Viterbi decoding system interprets bits in received QAM constellations as many-valued parameters rather than binary valued parameters. It performs the Viterbi algorithm using these many-valued parameters to provide results superior to hard decision decoding. Rather than applying a hard 0-1 function to the QAM data, the system uses a non-stepped linear or curved transfer function to assign values to the bits. In another aspect, a system differentiates between data bits based on their estimated reliability, giving more emphasis to decoding reliable bits than unreliable bits using any of a variety of techniques. By differentiating between god and bad bits and de-emphasizing or ignoring unreliable bits, the system can provide a significant reduction in uncorrectable errors and packet loss.

Abstract: One or more preambles are inserted into frames of Orthogonal Frequency Multiplexing (OFDM)-Multiple Input, Multiple Output (MIMO) signals. The preamble is received by the antennas of a receiver, decoded and compared to known values to provide synchronization, framing, channels estimation, offsets and other corrections to the transmitted signal.

Abstract: An embodiment of the present invention is a technique to process signals in a communication system. In one embodiment, a plurality of signal processing units processes signals received from a plurality of antennae. The signal processor units are controlled by operational mode control signals. A channel estimator estimates channel responses using the processed signals according to an operational mode. An equalizer and combiner generates an equalized and combined signal using the received signals and the estimated channel responses. A Carrier to Interference Noise Ratio (CINR) estimator estimates CINR from the equalized and combined signal. The estimated CINR is used to generate the operational mode control signals. In another embodiment, a sub-carrier allocation controller generates sub-carrier allocation signals using an allocation base.

Abstract: A data transmission method and apparatus are disclosed using receivers having spatial diversity, with the receivers communicating with a common client via network communication. Improved systems and methods for data transmission according to the disclosed method and apparatus include at least: a transmission source for transmitting a data signal; a first receiver for receiving the data signal; a second receiver for receiving the data signal, wherein the second receiver is spaced apart from the first receiver thereby providing spatial diversity; and a communication network for facilitating communication between a client and at least the first receiver and the second receiver, as needed, wherein the client is capable of analyzing individual data signals received by the first and second receivers and forming a composite signal of a higher quality than the quality of the individual data signals.

Abstract: A phase-shift based pre-coding scheme used in a transmitting side and a receiving side that has less complexity than those of a space-time coding scheme, that can support various spatial multiplexing rates while maintaining the advantages of the phase-shift diversity scheme, that has less channel sensitivity than that of the pre-coding scheme, and that only requires a low capacity codebook is provided.

Abstract: A signal transmitting device and a method for transmitting via a signal transmitting device is disclosed. In one embodiment the transmitting device comprises a first resonant circuit with a resonant circuit inductance and a resonant circuit capacitance and a second resonant circuit with a resonant circuit inductance and a resonant circuit capacitance, a coupling element which couples the first resonant circuit to the second resonant circuit, a first excitation circuit, coupled to the first resonant circuit, and at least one further excitation circuit coupled to the second resonant circuit.

Abstract: A system for combining a plurality of signals of various phases having a wide frequency range includes a signal transmuter configured to receive a plurality of input signals of different phases. The signal transmuter is also configured to generate at least one output signal based on one or more of the input signals. The system also includes at least one switch configured to receive a control signal and operable to selectively couple at least one associated capacitor to the at least one output signal. The coupling is such that the capacitor is coupled to the at least one output signal when the switch is closed. The control signal is set to substantially reduce the saturation of the at least one output signal.

Abstract: To provide a technology for suppressing emission of stronger radio wave due to a mismatched combination of a communication device with an external antenna module. A communication device comprises: a connector that is connected to an external antenna module; a generating section that generates a transmitting signal of a specific frequency band, the transmitting signal being supplied to the antenna module via the connector; an acquiring section that acquires information relating to antenna gain from the antenna module; and a controlling section that executes predetermined processing on the basis of the information relating to antenna gain, such that strength of radio wave emitted from the antenna module responsive to the transmitting signal does not exceed an upper limit value defined for the specific frequency band.

Abstract: A method for detecting encoded digital data from a substantially sinusoidal waveform, the encoded digital data having one of a first value and a second value at selected phase angles ?n comprises generating the waveform having an amplitude Y defined by a first function at phase angles lying outside of regions having a range ?? beginning at each phase angle ?n, said first function being Y=sin ?; generating the waveform having an amplitude Y defined by the first function at phase angles lying inside the regions having a range of ?? beginning at each phase angle ?n where data of the first value is to be encoded; and generating the waveform having an amplitude Y defined by a second function at phase angles lying inside the regions having a range of ?? associated with each phase angle ?n where data of the second value is to be encoded, the second function being different from Y=sin ?, the detection including deriving sync pulses from minima and maxima of the substantially sinusoidal waveform to frame data words.

Abstract: A phase error correction circuit includes a complex phase rotator for multiplying an input VSB (vestigial-sideband) signal by a phase correction signal and outputting a resultant signal, a specific frequency component elimination filter for eliminating a specific frequency component from the signal output from the complex phase rotator and outputting a resultant signal, a waveform equalizer for performing waveform distortion correction to the signal output from the specific frequency component elimination filter and outputting a resultant signal and a phase correction signal generator for detecting a phase error based on the signal output from the waveform equalizer and outputting a complex signal corresponding to the detected phase error as the phase correction signal.

Abstract: Techniques for estimating signal quality in a communication system are described. Scaled errors are obtained for inphase (I) and quadrature (Q) components of detected symbols. The scaled errors are determined based on a first function having higher resolution for small errors than large errors between the detected symbols and nearest modulation symbols. The first function may be a square root function or some other function that can provide good resolution for both low and high SNRs. The scaled errors for the I and Q components are combined to obtain combined scaled errors, which are averaged to obtain an average scaled error. A signal quality estimate is then determined based on the average scaled error and in accordance with a second function having non-linearity to compensate for the first function.

Abstract: A high-speed maximum likelihood sequence estimation method and device. The method includes identifying candidate paths through a state trellis based on a group of observed data, where each candidate path corresponds to a best path through a trellis beginning at one of a possible prior states (and corresponding prior data bit or bits), and then selecting one of the paths based on candidate sequence selection information, typically prior state decisions (e.g., data symbols in the form of one or more bits). The path selection, in turn, provides decoding of symbols and data bit information for use in selecting one of the candidate paths in a subsequent stage.