Abstract: The invention provides a method of spatial scalable compression of video stream. The video stream is a stream having a resolution higher than a specified resolution. Firstly, the video stream is down-sampled and encoded to obtain a base stream; then the base stream is decoded and up-sampled to obtain a reconstructed stream; the reconstructed stream is subtracted from the video stream to obtain a residual stream; and next, a gain value is obtained according to an expected bitrate; in the end, the gain value is multiplied by the residual stream, the result obtained thereby is encoded to obtain an enhancement stream. The invention can not only determine the gain value according to the video stream itself, but also adjust the gain value dynamically according to external application environments, thus enabling the bitrate of the enhancement stream to meet the actual demand always.

Abstract: A video signal processing apparatus and method and a display apparatus are provided. The video signal processing apparatus includes: an input unit through which a video signal is input; a signal processing unit which processes the video signal input through the input unit, wherein signal processing unit encodes the video signal if a transmission distance from the transmitting unit to the display apparatus is greater than a reference distance; and a transmitting unit which transmits the video signal processed by the signal processing unit to a display apparatus using wireless communication.

Abstract: The present invention relates to a decoding circuit for a flat panel display, and more particularly to a decoding circuit for a flat panel display wherein a miniaturization is possible by reducing an area of the circuit. There is provided a decoding circuit comprising: a first decoder for selecting a predetermined number of gradation voltages from a plurality of gradation voltages according to a least significant bit or least significant bits of an image data; a second decoder for selecting one of the selected gradation voltages to be outputted to an output terminal according to a plurality of selection signals; and a third decoder for outputting the plurality of the selection signals according to a most significant bit or most significant bits of the image data, wherein a minimum length of gates of a plurality of MOSFETs included in the first decoder is shorter than that of a plurality of MOSFETS included in the second decoder.

Abstract: A system, method and computer-readable medium for reducing the required throughput in an ultra-wideband system is provided. A temporal sub-sampling routine limits the number of frames, or portions thereof, to be transmitted to a sink over an RF link. The temporal sub-sampling routine may have a fixed, or static, sub-sampling rate that specifies the rate at which frames are discarded. In accordance with another embodiment, an automatic temporal sub-sampling mechanism is provided. Additionally, a tile copying mechanism may be implemented for reducing the throughput of the RF link. A WDV subsystem may include an interface to an external frame buffer that facilitates the temporal sub-sampling and tile copy routines disclosed herein.

Abstract: Today's video codecs require the intelligent choice between many coding options. This choice can efficiently be done using Lagrangian coder control. But Lagrangian coder control only provides results given a particular Lagrange parameter, which correspond to some unknown transmission rate. On the other hand, rate control algorithms provide coding results at a given bitrate but without the optimization performance of Lagrangian coder control. The combination of rate control and Lagrangian optimization for hybrid video coding is investigated. A new approach is suggested to incorporate these two known methods into the video coder control using macroblock mode decision and quantizer adaptation. The rate-distortion performance of the proposed approach is validated and analyzed via experimental results.

Abstract: An encoding control apparatus is disclosed that includes a variance calculation unit configured to calculate a variance of an encoding target macroblock; a sum-of-absolute-difference calculation unit configured to calculate a sum of absolute differences between the encoding target macroblock and a reference macroblock; a setting unit configured to set, based on the variance and the sum of absolute differences, a standard for determining whether to skip encoding of the encoding target macroblock; a prediction unit configured to perform motion compensation prediction on the encoding target macroblock to obtain a motion-compensated prediction value; and a determination unit configured to determine whether to skip encoding of the encoding target macroblock by comparing the motion-compensated prediction value with the standard. Related apparatuses and methods are also disclosed.

Abstract: A method of encoding a block of data. A first plurality of data in the block of data is assigned a worth based on a first algorithm. A second plurality of data, which is lower in frequency than the first plurality of data, in the block of data is assigned a worth according to a second algorithm. The block of data is assigned a worth based on the worth of the first plurality of data and the second plurality of data. The worth of the block of data is then compared to a threshold value, and subsequently one or more data values of the block of data are adjusted based on the comparison.

Abstract: A method and a device for supplying a decoder with data stream such as compressed video signal including both non-predictive and predictive data frames of a common data type. A device comprising a decoder for service data is provided with (1012, 1020) a specific frame that is a predictive frame indicating substantially no changes in the service data in relation to a possible previous service data frame supplied. A service data buffer is monitored (1014) and in case it's at least near an underflow condition according to a number of predetermined criteria (1016), the decoder is fed with the specific frame in order to prevent the decoder from being disturbed due to a lack of timely provided proper input data (1018).

Abstract: Systems, devices, processors, and methods are described for tagging the reliability of received data. A frame of data is received in a digitized version of a wireless signal may be received and stored in a frame memory table. Errors within the stored portion of the frame may be searched for by accessing and processing the data from the frame memory table. In a second memory table, a memory location corresponding to a region of the first memory table may be tagged based on the search. Rows to be corrected may be identified based on the tag state for their corresponding region.

Abstract: This disclosure describes techniques for encoding data to compress image data to a reduced size. The techniques may be particularly effective in transcoding an image to a reduced size for transmission. An encoding device may transcode an image to an acceptable file size using bitrate control techniques that affect the entire image uniformly to transcode the image. For example, the encoding device may modify one or more quantization tables as a function of the near linear relationship between bitrate (R) and the number of zero-valued quantized transform coefficients to reduce the file size uniformly over the entire image. Alternatively, or additionally, the encoding device may transcode the image using bitrate control techniques that affect only specific localized regions of the image.

Abstract: Detection of errors in a video stream occurs by calculating an error detection code, such as a Cyclic Redundancy Check (CRC) code over a group of not more than N macroblocks in a slice of the stream prior and after transmission, where N is an integer greater than zero but less than the total number of macroblocks in the slice. A comparison of the error detection codes reveals whether any errors exist in the group of macroblocks. If the group has no errors, normal decoding occurs. If the macroblock group has an error, then the macroblock group, and the remaining blocks in the slice undergo error concealment.

Abstract: An inverse wavelet transformer causes a level-graded buffer to store one of two lines of coefficient data generated through a synthesis filtering operation. In order to adjust an output timing of image data, the inverse wavelet transformer causes an output buffer to store temporarily the other line of the two lines of coefficient data in a period throughout which the output buffer stores no baseband image data and then causes the level-graded buffer to store the other line of the two lines of coefficient data. In this way, the level-graded buffer stores coefficients generated through the synthesis filtering operation on a line-by-line basis.

Abstract: Improving throughput performance when applying deblocking filters on reconstructed image frames. In one embodiment, an image frame received in the form of a set of values in encoded format is decoded to form a second set of values representing a reconstruction of the image frame in a decoded format. The specific one of the pairs of edges (formed by sub-blocks in the image frame) to which a deblocking filter is to be applied is then determined by evaluating any pre-conditions that need to be satisfied according to a standard. The deblocking filter is then applied to the determined specific ones of the pairs of edges, with the application being performed after determining.

Abstract: This invention relates to methods for the parallel deblocking of macroblocks of a compressed media frame, such as a frame from a compressed video stream, to smooth out artifacts and discontinuities caused by the compression of the media. These methods for parallel deblocking of a frame having a plurality of tiles wherein each tile having a data dependency on zero or more of said tiles, comprising the steps of: constructing a reference deblocking sequence for the processing of said tile as a function of the data dependency of each respective tile; calculating scheduling indices for said tiles as a function of said reference deblocking sequence; and deblocking said tiles in accordance with said scheduling indices.

Abstract: A source sends an encoded data block during a first time interval to a destination and to a relay. The source sends additional parity bits for the encoded data block during a second time interval. The relay partially decodes that encoded data block to a process-defined end point (typically only a partial decoding), such as a fixed number of decoding iterations. After partial decoding the relay forms a modified data block having corrected information bits and the parity bits of the block it received, and sends the modified data block to the destination, during the second time interval. The destination decodes to a results-defined end point the modified data block it received from the relay using the additional parity bits it received from the source. If that end-point cannot be reached, the destination may begin anew decoding the original encoded data block it received from the source.

Abstract: A circuit and a method for baseline wandering compensation for solving the problem of baseline wandering in receivers of a communication system are provided. Two paths of baseline wandering compensation are provided on the basis of a slicer error. One of the paths adjusts a direct current (DC) bias of an input signal, and the other path adjusts the determining levels of the slicer, and thus, the present invention avoids input saturation of an analog-to-digital converter, enhances the signal-to-noise ratio, and achieves a precise baseline wandering compensation.

Abstract: An all-digital serializer-de-serializer includes an all-digital clock multiplier unit (CMU) circuit, an all-digital clock and data recovery (CDR) circuit, a multiplexer (MUX), and a demultiplexer (DeMUX). The all-digital clock and data recovery (CDR) circuit couples to the all-digital clock multiplier unit (CMU) circuit. The multiplexer (MUX), couples to all-digital clock multiplier unit (CMU) circuit, and serializes data. The demultiplexer (DeMUX), couples to the all-digital clock and data recovery (CDR) circuit, and de-serializes data.

Abstract: When a UE (102) determines that non-control data needs to be transmitted, the UE will receive a grant that comprises information identifying a resource block (RB) for transmissions by the UE. If the UE determines that the RB is also used for transmitting control data, it will know to transmit only over the portion of the RB used for non-control data transmissions. Rate matching will then be performed on the non-control data that needs to be transmitted and the non-control data will be transmitted only over a portion of the RB. The second portion of the RB will be used for normal control data transmissions by other UEs.

Abstract: In some embodiments, a device includes a multiple-input multiple-output (“MIMO”) decoder module coupled to a first log-likelihood-ratio (“LLR”) computing unit. The decoder module includes at least one processing unit and at least one sorting unit. The decoder module preferably uses a K-best breadth-first search method to decode data from MIMO sources. In some embodiments, a method includes receiving data representing a vector of receive signal samples detected by multiple receive transceivers. The method further includes performing a K-best breadth-first search on the data to obtain an estimated constellation point. The method further includes providing a user data stream based at least in part on the estimated constellation point.

Abstract: An orthogonal frequency division multiplexing (OFDM) transmitting apparatus including a signal processing unit, a subcarrier orthogonalization processing unit, and a transmitting unit is provided. The signal processing unit divides a received signal into several real parts and several corresponding imaginary parts. The subcarrier orthogonalization processing unit is coupled to the signal processing unit for receiving the real and the imaginary parts of the signal, and for making the real and the imaginary parts respectively carried by a plurality of different and orthogonal subcarriers. The transmitting unit is coupled to the subcarrier orthogonalization processing unit to transmit the subcarriers.

Abstract: In general, in one aspect, the disclosure describes an apparatus that includes a sample averager to construct a preliminary estimate of a spatial covariance matrix from a received communications signal. A time-domain filter with Cholesky decomposition is used to decompose the preliminary estimate of the spatial covariance matrix into product of an upper triangular matrix and complex conjugate of the upper triangular matrix. The time-domain filter with Cholesky decomposition is also used to filter the upper triangular matrix and construct an updated estimate of the spatial covariance matrix using the filtered upper triangular matrix.

Abstract: An integrated circuit (IC) includes at least one baseband section, at least one radio frequency (RF) section, and an interface module. The interface module is operable to couple the at least one baseband section to the at least one RF section, wherein the interface module includes an analog interface module and a digital interface module.

Abstract: The present invention provides a method for feedback and transmission of multi-user (MU) multiple input multiple output (MIMO) in a wireless communication system. The method includes steps of selecting subset codebook or full code book based on traffic load of a base station, and broadcasting the selected codebook to user equipments. In high traffic load, subset codebook is selected, and in low traffic load, full codebook is selected. User stations calculated a channel quality indicator of a spatial codeword vector that is included in the selected codebook. Information of the maximum channel quality indicator is sent to the base station together with a precoder of the user equipment. The base station selects user equipments based on the information of the maximum channel quality indicator and precoder, and transmits precoder signal and data signal to the user equipments. The present invention also provides a system for the base station that causes the base station to perform the above mentioned operations.

Abstract: A multi-point communications system is set forth herein. The communications system comprises a head end unit disposed at a primary site and a plurality of receivers disposed at remote sites. The head end unit includes a transmitter for transmitting OFDM/DMT symbols over a predetermined number of bins across a transmission medium. The OFDM/DMT symbols are transmitted in periodically occurring formatted symbol frames. The cyclic prefix includes a predetermined periodic signal superimposed thereon. The receivers receive the OFDM/DMT symbols over a subset of the predetermined number of bins from the transmission medium and use the superimposed signals to attain symbol alignment. Preferably, the superimposed signal is an impulse signal that varies in polarity throughout the transmission cycle and which is superimposed on one or more symbols occurring during a cyclic prefix of the formatted symbol frames.

Abstract: A method and apparatus for detecting a transmit signal in a receiver in a multiple-input multiple-output (MIMO) system are provided. The method includes: dividing a constellation space into a plurality of sub-spaces, the constellation space being determined by a channel matrix, which indicates channel characteristics of the MIMO communication system, and the number of antennas; and detecting the transmit signal by calculating a metric of at least one of the sub-spaces. The apparatus includes: a channel estimation unit which estimates channel characteristics of the MIMO communication system; a preprocessing unit which preprocesses the estimated channel-characteristic data; and a signal detection unit which processes a received signal measured by the receiver using the preprocessed channel-characteristic data, divides a constellation space used to detect the transmit signal into sub-spaces, and executes a statistical algorithm on at least one of the sub-spaces.

Abstract: Techniques for determining positions of pilot sub-carries in a received OFDM symbol are described. Components of pilot sub-carries from a theoretical OFDM symbol are extracted to form M theoretical pilot sequences according to M possible distributions in frequency domain of the pilot sub-carries in the theoretical OFDM symbol. Components of pilot sub-carries from the received OFDM symbol are also extracted to form K hypothetical pilot sequences according to K possible distributions in frequency domain of pilot sub-carries in the received OFDM symbol. The correlations of every two adjacent elements of the theoretical pilot sequences are calculated to get M corresponding theoretical correlation sequences, and the correlations of every two adjacent elements of the hypothetical pilot sequence are also calculated to get K corresponding hypothetical correlation sequences. Sequence correlations between the hypothetical correlation sequences and the theoretical correlation sequences are then calculated.

Abstract: A multi-cell Orthogonal Frequency-Division Multiple Access (OFDMA) based wireless system and method with full spectral reuse co-channel interference mitigation via base station coordination in a downlink channel includes a plurality of base stations configured to handle communications with mobile units. A central controller is configured to mitigate interference between base stations via jointly optimizing coordinated scheduling and power allocation in accordance with a sub-optimal iterative solution. Five methods provide the solution, which include: 1) Improved Iterative Water-Filling (I-IWF); 2) Iterative Spectrum Balancing (ISB); 3) Successive Convex Approximation for Low-complexity (SCALE); 4) Opportunistic Base Station Selection (OBSS) and 5) Per-tone binary power control (PT-BPC).

Abstract: A data processing apparatus maps input symbols to be communicated onto a predetermined number of carrier signals of an Orthogonal Frequency Division Multiplexed (OFDM) symbol. The data processor includes an interleaver memory which reads-in the predetermined number of data symbols for mapping onto the OFDM carrier signals. The interleaver memory reads-out the data symbols on to the OFDM carriers to effect the mapping, the read-out being in a different order than the read-in, and the order being determined from a set of addresses. The set of addresses are generated from an address generator. The address generator includes a linear feedback shift register and a permutation circuit.

Abstract: A transmission of information from a secondary to a primary node occurs in a plurality of N logical time durations. The transmission from the secondary to primary node in a wireless network is obtained using a first and a second sequence. Embodiments of the present invention mitigate interference by restricting the choice of the first sequence. Thus, in an embodiment of the invention, the first sequence is selected from a set of M sequences wherein M is strictly less than N. In order to accommodate high—velocity users, the restricted set contains a pair of sequences whose element—wise product is mirror symmetric. A transmission component for K-th logical time duration is obtained from the entire second sequence and K-th element of the first sequence.

Abstract: This invention relates to a method for determining at least one characteristic of an OFDM signal within a received signal, characterised in that: a plurality of cyclic correlation coefficients (?k/(?+?)(?)) for the received signal is calculated (420, 520) for a correlation time difference (?) and a plurality of cyclic frequencies ( k ? + ? ) ; a discrimination function is calculated (430, 530) as a function of the amplitude of said cyclic correlation coefficients; said OFDM signal characteristic is deduced (440, 561, 562) as a function of at least one value of said discrimination function.

Abstract: A method for reducing a Peak to Average Power Ratio (PAPR) using reserved tones in a transmission apparatus of an Orthogonal Frequency Division Multiplexing (OFDM) communication system is provided. The method includes detecting a subcarrier spacing interval and the number of spaced symbols based on a predetermined pilot pattern upon signal reception, and determining positions of shifted reserved tones obtained by shifting positions of reserved tones allocated to a predetermined symbol during the number of the spaced symbols at intervals of the spacing interval; determining an impulse waveform obtained by rotating a phase of a complex value of an impulse stored in a memory, using the determined positions of frequency-domain reserved tones of each symbol; calculating a subtrahend for a PAPR of an output signal using the phase-rotated impulse waveform; and reducing a PAPR of an input signal by performing a gradient algorithm using the phase-rotated impulse waveform.

Abstract: An apparatus and a method are provided for detecting N number of TX signals in a MIMO wireless communication system. The apparatus includes an RF processor, a channel estimator, and a signal detector. The RF processor converts signals, received through multiple antennas, into baseband signals. The channel estimator estimates channel information of the respective antennas by using the received signals. The signal detector arranges the baseband signals of the respective antennas on the basis of the channel information, calculates a threshold value of each stage, and selects symbols with a cumulative metric smaller than or equal to the threshold value as candidates at each stage, to detect a TX signal vector with N number of symbols.

Abstract: Disclosed are an apparatus and a method for estimating a channel in a base station when using an Optional Partial Usage of Sub-Channels (OPUSC) mode in an uplink channel of a communication system supporting Orthogonal Frequency Division Multiplexing/Orthogonal Frequency Division Multiple Access (OFDM/OFDMA). In order to estimate the channel in the OFDM/OFDMA communication system, according to the present invention, pilots and data are extracted from input signals, phase change caused by time delay is estimated using the extracted pilots and data, and a channel estimation value is obtained by reflecting the estimated phase change.

Abstract: The problem outlined above may at least in part be addressed by N-Candidate Depth-First Decoding methods and systems that employ such methods. In some embodiments, the method includes receiving data representing a vector of receive signals detected by multiple receive transceivers; performing an N-candidate, depth-first search on the data to obtain an estimated constellation point; and providing a user data stream based at least in part on the estimated constellation point. In some embodiments the system includes a multiple-input multiple-output decoder. The decoder is configured to perform an N-candidate, depth-first search as part of converting a receive signal into a data stream.

Abstract: Methods and apparatus for improving the utilization of air link resources in a wireless communications system, e.g., an OFDM MIMO system, including a base station with multiple transmit antennas are described. Superposition signaling in the downlink is employed. The superimposed signal includes a first transform result signal and a second lower power signal. The first transform result signal is generated from a first signal, which uses position modulation, e.g., including null components and high power non-null components. Different components of the first transform result signal are directed to different transmit antennas. The first transform result signal communicates information to a first wireless terminal, e.g., a weak receiver. The non-null received elements of the first transform result signal are utilized by a second wireless terminal, e.g., a superior receiver, as pilots to determine a channel estimate.

Abstract: A method and an apparatus (300) for generating corrected quadrature phase signal pairs in a communication device are provided. The apparatus (300) includes a quadrature phase generator (310), programmable delay elements (320, 330) and a control circuit (360). The programmable delay elements (320, 330) receive a quadrature phase signal pair (signals I 312 and Q 314) from the quadrature phase generator (310). The control circuit (360) generates a control signal (362) based on outputs (325, 335) of the programmable delay elements (320, 330). The control signal (362) configures the programmable delay elements (320, 330). The programmable delay elements (320, 330) are configured to adjust delay between the signals I (312) and Q (314). The programmable delay elements (320, 330) are also used to adjust duty cycle for the quadrature phase signal pair to provide the corrected quadrature phase signal pair.

Abstract: The invention provides a method of encoding a binary data message for transmission over a data network. The method comprises allocating consecutive six bit sequences from the binary data message to consecutive respective bytes of an encoded data message; adding a predetermined bias value to some or all of the byte values of the encoded data message; and replacing respective selected data byte values in the encoded data message with one or more corresponding replacement data byte values. The invention further provides a method that comprises forming two or more message fragments from the binary message, each message fragment comprising respective bit sequences of the binary message; encoding each message fragment by the method outlined above to form two or more encoded message fragments; and adding a header to each encoded message fragment. The invention further provides an encoding engine for encoding a binary data message for transmission over a data network.

Abstract: Provided is a method for transmitting an uplink Channel Sounding (CS) Reference Signal (RS) channel in a wireless communication system. The method includes transmitting symbols of the CS RS channel through an entire system band in a previously selected at least one of Long Blocks (LBs) constituting one time slot of a subframe; and transmitting symbols of control channels through a predetermined band in LBs remaining after symbols of the CS RS channel are applied in the time slot, by applying an orthogonal sequence determined according to the number of LBs to which symbols of the CS RS channel are applied.

Abstract: A communication method for transmitting and receiving a coded signal is provided. In a transmitting end, the method holds (determines) control information for specifying an insertion position and an insertion amount to insert a redundant signal known to the receiving apparatus into an information data sequence, generates a coded signal sequence by encoding an information data sequence, generates a transmission signal by inserting the redundant signal into the coded signal sequence based on the held control information, and transmits the generated transmission signal. In a receiving end, the method receives the transmission signal as a received signal, holds likelihood information for a redundant signal contained in the received signal, calculates a likelihood from the received signal, substitutes the likelihood information for a likelihood corresponding to the redundant signal included in the calculated likelihood and demodulates the signal.

Abstract: The present invention discloses a method for determining a target type of a plurality of control signals respectively transmitted via a plurality of channels in a multi-channel system. The method includes: receiving a plurality of first control signals simultaneously from the channels during a first time period; determining a control signal priority corresponding to the first time period according to a target type determined by actual types of a plurality of second control signals respectively transmitted via the channels during a second time period, wherein the second time period is prior to the first time period; and determining the target type of the first control signals according to the control signal priority and actual types of the first control signals.

Abstract: In an embodiment, a digital pre-distortion apparatus processes an input signal to produce a pre-distorted signal, and processes the pre-distorted signal to produce a feedback signal. The apparatus also rotates an adjustment gain by a gain rotation angle to produce a rotated adjustment gain, where the gain rotation angle is based on a phase difference between the input signal and the feedback signal. The apparatus also applies the rotated adjustment gain to the feedback signal, which may result in rotation of the feedback signal into a target phase region.

Abstract: A method of reducing distortion in the output of an amplifier is provided. The method comprises subtractively combining an error signals with the appropriate phase shift with input signals to be amplified. The error signal being generated by subtractively combining a fed-forward portion of the input signal with a portion of the fed-back amplified output signal, and signal processing applied to it between its generation and application to correcting the input signal in the baseband domain. The error therefore being down-converted, filtered, and up-converted in the feedback path. The filtered baseband error signal components providing inputs to a controller which adjusts active elements of the amplification and feedback path in order to minimize the distortion within the output of the amplifier.

Abstract: Techniques for transmitting data and pilot for control information are described. In one aspect, a user equipment (UE) may spread a reference signal sequence with a first orthogonal sequence to obtain multiple pilot sequences. The UE may then send the multiple pilot sequences on multiple subcarriers in multiple symbol periods, one pilot sequence in each symbol period. The UE may modulate the reference signal sequence with control information (e.g., ACK information) to obtain a modulated sequence. The UE may spread the modulated sequence with a second orthogonal sequence to obtain multiple data sequences. The UE may then send the multiple data sequences on the multiple subcarrier in multiple symbol periods for data. In another aspect, the UE may send multiple pilot sequences on multiple subcarriers in multiple symbol periods separated by at least one symbol period, one pilot sequence in each symbol period.

Abstract: Systems and methods for adaptive signal sampling and sample quantization for resource-constrained stream processing. Exemplary embodiments include a signal sampling and signal quantization method for a data stream from a ECG sensor into a pervasive device, the method including adaptively sampling the data stream, compressing data samples from the data stream, reducing the number of samples via quantization, defining a utility function for signal reconstruction, and formulating optimization on the reconstructed signal that is jointly sampled and quantized.

Abstract: The present invention discloses a signal receiving method for determining a transmission format of an input signal and a related signal receiving circuit. The signal receiving method includes: receiving the input signal; generating a signal detecting result corresponding to at least a signal transmission channel of a plurality of signal transmission channels according to an output result of the signal transmission channel; and determining the transmission format of the input signal according to the signal detecting result. The signal receiving circuit includes: an input interface, for receiving an input signal; a detecting module, for generating a signal detecting result corresponding to at least a signal transmission channel of a plurality of signal transmission channels according to an output result of the signal transmission channel; and a determining unit, for determining the transmission format of the input signal according to the signal detecting result.

Abstract: A method and receiver systems for demodulating and decoding a hierarchically modulated signal, e.g. an 8PSK signal, are disclosed. An exemplary method includes demodulating and processing (502) the hierarchically modulated signal (202) to produce symbols (212) from the first modulation at the first hierarchical level, applying information (504) from a plurality of the symbols from the first modulation at the first hierarchical level in subtracting (214) from the demodulated hierarchically modulated signal to obtain the second modulation at the second hierarchical level and processing (506) the second modulation at the second hierarchical level to produce second symbols (222) from the demodulated second signal. The hierarchically modulated signal comprises a non-uniform 8PSK signal. Applying the information from the plurality of the symbols from the first modulation can be achieved by applying the symbols after error correction.

Abstract: The dynamic DC offset canceling apparatus includes: section 104 that detects dynamic DC offset in longest overlapping part sequences from the differences between the sampling values of a first longest overlapping part sequence and the sampling values of a second longest overlapping part sequence, the first longest overlapping part sequence and the second longest overlapping part sequence being overlapping part sequences in a training sequence of the received signal; section 105 that detects dynamic DC offset outside the longest overlapping part sequences from the difference between an average value of sampling values of a received signal which exists in a burst before the first longest overlapping part sequence, and an average value of sampling values of a received signal which exists in a burst after the second longest overlapping part sequence; and section 106 that adaptively subtracts a DC offset value from the received signal based on these results.

Abstract: An electronic quadrature device is provided comprising at least one I signal path (I) and at least one Q signal path (Q); at least one first sigma-delta modulator (DSDMI) and at least one first digital/analog converter unit (DACI) arranged in the at least one I signal path (I); and at least one second sigma-delta modulator (DSDMQ) and at least one second digital/analog converter unit (DACQ) arranged in the at least one Q signal path (Q). The at least one first sigma-delta modulator (DSDMI) is coupled to the at least one second sigma-delta modulator (DSDMQ) via at least one complex signal path (C1-C4) to implement a complex filter.

Abstract: An improved receiver and method estimate one or more parameters, such as amplitude and signal-to-noise ratio, of a received signal, such as an M-QAM or q-ASK signal. The amplitude of an M-QAM signal is estimated based upon known or ascertainable phase information regarding a plurality of transmitted symbols. The amplitude of a q-ASK signal is estimated based upon known or ascertainable magnitude information regarding a plurality of transmitted symbols. In another embodiment, the amplitude of an M-QAM or q-ASK signal is estimated based on statistical knowledge of the amplitude of the transmitted symbols. Other embodiments estimate amplitude, noise power, and signal-to-noise ratio of a received signal utilizing second-order and fourth-order moments of received samples, a maximum likelihood searching process, or a Kurtosis estimation process.

Abstract: Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency, and/or amplitude characteristics of the desired time-varying complex envelope signal. In another embodiment, a time-varying complex envelope signal is decomposed into a plurality of constant envelope constituent signals. The constituent signals are amplified equally or substantially equally, and then summed to construct an amplified version of the original time-varying envelope signal. Embodiments also perform frequency up-conversion.