Abstract: Interference between collocated wireless devices sharing the same RF channel is avoided or minimized by a new header format provided for the first data packet in an RF transmission. By inclusion of an invalid pulse in the header of each isolated data packet, an FM receiver that “captures” a desired signal from a closest device, midstream of processing an undesired signal (pertubation) from a more distant collocated device, is caused to abort the invalid packet and reinitialize. The receiver is then able to properly process the first packet in the desired transmission (from the closest device).

Abstract: A device for decoding a direct sequence spread spectrum-encoded binary message includes a sampler that captures at least one sequence of binary samples corresponding to one bit of the transmitted message. The captured sequence of samples are applied to a filter matched to the spreading code used, thus making it possible to delete the spreading applied to the original message. The device further includes, at the output of the sampler, an error correction block including a memory storing a plurality of binary sequences corresponding to all of the possible values for a captured sequence of samples. A replacement circuit replaces the captured sequence of samples with the stored sequence, thereby minimizing the number of samples different from the captured sequence of samples, and allowing the stored sequence to be applied to the matched filter.

Abstract: A network aware mobile device (12) includes a transceiver, which identifies one of a plurality of networks (18,20,22) with which the transceiver can communicate. Memory stores information associating networks with operations, which can be performed using the transceiver. Operations are executed when communication with one of the plurality of networks is permitted.

Abstract: A transmission system for a digital signal includes a transmitter and a receiver connected thereto by a transfer bus. The transmission system includes at least one conductive line capacitively coupled with the transfer bus.

Abstract: A timing lock detection apparatus and method for digital broadcasting receiver are provided. The apparatus includes: a discrete value generator for cyclically selecting a discrete signal value from a continuous timing error signal; a differential calculator for obtaining a difference between the currently selected timing error signal value and a previously selected timing error signal that is a timing jitter signal; a sign variation detector for detecting variation in a sign of the timing jitter signal; a lock control signal generator for discriminating a period based on the detected sign changing time, and controlling a lock step of the loop filter according to a convergence mode of the timing jitter signal at each period; and a lock detection signal generator for generating a lock signal or an unlock signal according to whether the timing jitter signal reaches a steady state and using the current lock step signal.

Abstract: Techniques to facilitate estimating the frequency response of a wireless channel in an OFDM system are provided. The method and systems allow for combining signal information across multiple communication channels at one or more channel tap delays in order to determine appropriate taps for channel information.

Abstract: A system (10) and method (50) of equalizing an audio signal from an existing radio or head unit (30) using an interface unit (10) between the radio or head unit and a replacement load (34) can include the steps analyzing (64) an existing equalization to provide a measure of an existing frequency response, generating (66) a substantially inverted frequency response to the existing frequency response, and applying (74) the inverted frequency response to the replacement load to provide a desired response. Such as system can include an interface unit (12) having an automatic input level control unit (14), an analog to digital converter or digitizer (16), a DSP (18) providing an output to a DAC (20), a level booster unit (22) and a processor such as a microcontroller unit (24).

Abstract: A parallel equalizer for a DS-CDMA UWB system and method thereof are provided. The parallel equalizer includes: a filter block for filtering a training input signal in a ‘training mode’, and filtering the plurality of input signals in parallel in a ‘symbol decision mode’; a symbol decision block for obtaining a symbol error based on a output from the filter block and a training symbol in the ‘training mode’, and estimating a transmission symbol for each of the input signals in the ‘symbol decision mode’, obtaining an error of one among the estimated transmission symbols for a symbol error calculating input signal; and an weight update block for updating a filter tap coefficients of the filter block based on the training input signal or the symbol error calculating input signal and the symbol error and transmitting the updated filter tap coefficients into the filter block.

Abstract: A delay line for deployment in an equalizer to insert a delay in a signal received by the delay line employs a plurality of cascaded delay stages where the delay per stage provided by an active unit-gain amplifier in each stage that provides sufficient impedance mismatch between the delay stages without substantial deterioration of the frequency response of the client signal undergoing deterioration of the frequency response of the client signal undergoing delay.

Abstract: A decision feedback equalizing apparatus selectively using a feedback filter and a method thereof are provided. The apparatus includes: an equalizing unit including a feed forward filter (FFF) for correcting a distorted transmission channel by receiving a match-filtered signal and a feedback filter (FBF) for reducing inter symbol interference ISI of the corrected transmission channel for driving only the FFF in a blind mode and driving the FFF and the FBF in a decision directed mode; a diverge/converge determining unit for determining whether the decision feedback equalizing apparatus is diverged or converged using a unit square error obtained through a least unit square algorithm; and a filter controlling unit for controlling the equalizing unit in a blind mode if the decision feedback equalizing apparatus is determined as divergence, and for controlling the equalizing unit in a decision directed mode if the decision feedback equalizing apparatus is determined as convergence.

Abstract: According to one embodiment, a system including a decoder and a high definition multimedia interface (HDMI) whose copy protection protocol has been modified to allow the received uncompressed digital audio-video content from the decoder to be re-encoded and recorded.

Abstract: The invention relates to a device and a method for coding video data. The device comprising means for coding each picture in slices of pictures, each slice being coded independently of the other slices. According to the invention, the device comprises means for inserting into the data stream at least one message indicating the structure relating to the breakdown of the pictures into slices. The invention also relates to a system for decoding and a method for decoding video data, the said video data having been coded in slices, each of the slices being coded independently of the other slices. According to the invention, the coding system comprises means for analysing the video data in order to ascertain the breakdown of the data into slices, means for decoding the video data slice by slice, means for reconstructing the various video data after they have been decoded in order to reconstruct the decoded video data.

Abstract: A video transmitting apparatus that is able to efficiently transmit and decode only the video data of the region of interest without lowering coding efficiency, and that is able to change the region of interest during reproduction of video. In this apparatus, a base layer coding section (116) codes the base layer of low resolution obtained by reducing input video of high resolution. A region map calculating section (118) calculates a region map indicating the divided region upon coding, and an enhancement layer coding section (120) performs intra-frame coding for each divided region after dividing the enhancement layer which is differential video of the input video and video obtained by decoding the base layer coded video and expanding the same to the resolution of the input video according to the region map.

Abstract: Encoding and decoding video signals according to the characteristics of coefficients included in the block of a fine granularity scalability layer is provided. Non-unitary coefficients that constitute the block and have absolute values that are not 0 or 1 are extracted from the video signal, a representative value from run values of the extracted non-unitary coefficients is calculated, the run values of the coefficients constituting the block and the representative value are compared, and codewords are assigned to the coefficients according to a result of the comparison.

Abstract: A method and apparatus for encoding and decoding a video signal on a group basis is disclosed, in which blocks constituting a multi-layer video signal are coded. The method includes grouping every two or more blocks having symbols that have a value identical to a predetermined value, generating group-based symbols each indicating information about the grouped blocks, and coding the group-based symbols.

Abstract: According to one embodiment, when a plurality of video frames are encoded in parallel, a rate control is executed on the basis of the generated bit amount in the encoded video frames, and encoding the video frames and a rate control at a synchronization point 6-2 are executed in parallel.

Abstract: An encoder, a method for adjusting decoding calculation, and computer program product therefor are provided. The encoder, comprising a parameter generator, an adder and a complexity computation unit, adjusts decoding calculation according to a first encoding parameter which is generated based on a video frame. The method and the computer program product therefor operate: the parameter generator to generate an image quality parameter; the adder to add the first encoding parameter and the image quality parameter to generate a second encoding parameter; the complexity computation unit to perform a complexity computation according to the second encoding parameter and to generate a third encoding parameter and an updating parameter; the parameter generator to update the image quality parameter according to the updating parameter; and the encoder to encode the video frame based on the third encoding parameter.

Abstract: A method of coding a moving picture for performing hierarchical coding comprises the steps of performing a first process on an input picture signal and thereafter spatially dividing the input picture signal into layers to obtain a first signal, reducing the input picture signal with a resolution converting filter and thereafter performing a second process on the input picture signal at a reduced resolution to obtain a second signal, and coding the first signal and the second signal. The first and second processes are first and second temporal filtering processes, for example, and the first and second signals are a temporally filtered lower-layer signal and a higher-layer temporally filtered signal, respectively.

Abstract: Disclosed is a motion estimation method for selecting a target motion vector from a plurality of candidate motion vectors in a search range of a target picture for an encoding block having a lot of pixels in a picture is disclosed. The method comprises: utilizing a distortion function to calculate difference between the pixels of the encoding block and the pixels in the search range of a target picture to generate at least one distortion value; utilizing an entropy function to determine the distribution of the difference between the pixels of the encoding block and the pixels in the search range of blocks corresponding to candidate motion vectors to generate at least one distribution values; summing up the distortion values and the distribution values to generate at least one sum value; and selecting the target motion vector according to the sum value.

Abstract: In a method of detecting a motion vector, each of a plurality of frames constituting an image along a time axis is divided into a plurality of blocks, a motion vector of a target block is detected using a motion vector that has already been detected from another block adjacent to a target block, each of the plurality of the frames is sequentially scanned, and a scanning is performed by shifting the target block from a certain block to another block in each frame, the detection of a motion vector method comprising: shifting the target block from a first block to a second block which is followed by a target block in a first direction; and shifting the target block from a third block to a fourth block which is adjacent to the second block and followed by a target block in a second direction different from the first direction.

Abstract: A moving picture estimation device and a moving picture estimation method which allow estimation of accurate motion vectors while reducing an amount of processing are provided.

Abstract: Disclosed is an image processing method which generates an interpolation image for compensating for a motion of an image between adjacent frames. The image processing method includes: detecting a motion vector of a detection target block on the basis of a comparison result obtained by dividing a frame into a plurality of blocks and comparing an image of each block with an image included in a search range of an adjacent frame; and generating the interpolation image on the basis of the detected motion vector, wherein in the detection of the motion vector, a first process having a wide search range or a second process having a narrow search range is selectively performed for each block, and wherein the search range of a block where the second process is performed is defined on the basis of the motion vector that has already been detected from the adjacent block.

Abstract: An apparatus and method for estimating motion are provided.

Abstract: A method for frame interpolation based on motion estimation converts a frame rate of an image frame source according to an appliance that displays the image frame. An apparatus for frame interpolation based on motion estimation includes a motion vector estimation unit estimating a final motion vector of a block in a specified frame, a motion vector post-processing unit smoothing the estimated final motion vector, and a motion error concealment unit concealing an error due to discontinuity among blocks having the smoothed final motion vector.

Abstract: A motion compensation method for achieving the reduction of operation workload and the simplification of a hardware configuration includes: interpolation having (i) a first calculation step (S100) of calculating base values of sub-pixel values by multiplying coefficients with pixel values of pixels included in a reference picture and (ii) a first rounding step (S102) of deriving sub-pixel values of sub-pixels by rounding the base values calculated in the first calculation step (S100) in stead of directly using the base values in calculating other sub-pixel values; and motion compensation (S110) of the reference picture that has interpolated sub-pixels with the derived sub-pixel values.

Abstract: A hardware multi-standard video decoder device. A command parser accesses a video stream and identifies a video encoding standard used for encoding the video stream. A plurality of hardware decoding blocks perform operations associated with decoding the video stream, wherein different subsets of the plurality of hardware decoding blocks are for decoding video streams encoded using different video encoding standards.

Abstract: Provided are motion estimation algorithm development and design of a structure for implementing hardware of a motion estimator. A hardware structure that simultaneously satisfies MPEG-4 and H.264 standards and requires less hardware is provided. The provided structure is applicable to both MPEG-4 and H.264 using one hardware device according to the mode (MPEG-4 or H.264). The motion estimation apparatus includes: a sampling portion for sampling image data in units of blocks and generating sampling blocks; a block division/address generator for dividing the sampling blocks into sampling sub-blocks and generating addresses for motion estimation calculation; and a motion calculator for calculating motion using a motion estimation function for each sub-block.

Abstract: A adaptive complexity control algorithm is proposed to reduce the complexity of H.264 motion estimation. The main idea is to limit the complexity of motion estimation based on the expected RD coding gain loss. In order to efficiently reduce the complexity to desired level, ACC is designed to provide complexity scalability in motion estimation so as to provide flexible tradeoff between video quality and computational complexity. With the proposed algorithm, we demonstrate that complexity of motion estimation can be reduced by ¾ without significant RD performance degradation.

Abstract: A method and apparatus for layered rateless coding are described. In one embodiment, the method comprises dividing content into a plurality of content layers based on priority; expanding each layer into an encoded layer using an erasure code at a coding rate to produce a plurality of encoding layers, wherein the coding rate for each layer is set based on the priority and reduces as the priority of the content layers increases; concatenating a plurality of encoding layers produced by passing the plurality of layers through fixed rate precoders; and performing rateless encoding on the concatenated plurality of encoding layers to produce rateless encoding blocks.

Abstract: A hardware multi-stream multi-standard video decoder device. A command parser accesses a plurality of video streams, identifies a video encoding standard used for encoding video streams of the plurality of video streams, and interleaves portions of the plurality of video streams. A plurality of hardware decoding blocks perform operations associated with decoding the plurality of video streams, wherein different subsets of the plurality of hardware decoding blocks are for decoding video streams encoded using different video encoding standards, such that interleaved video streams are decoded by activating subsets of the plurality of hardware decoding blocks for use in decoding the plurality of video streams. A plurality of register sets store parameters associated with the plurality of video streams.

Abstract: This invention provides an improved method for storing/replaying a specific program from a MPEG-2 multiple program transport stream. When storing, the method discards a related transport packet of the non-user-selected program and inserts a null packet at the corresponding discarding position, and the effective load of this null packet contains a number which indicates the number of continuously discarded packets at this position; when replaying, if the effective load of a null packet contains a specific numerical value, the method adds some null packets beside this null packet, the number of the added null packets being equal to that the specific numerical value minus one.

Abstract: A communication system which transmits and receives a communication signal having an intra-guard-interval (IGI) inserted is provided. The communication system includes a signal generator which is configured to generate a signal to carry data; and a signal output part which is configured to split a symbol period, which is a transmission unit of the communication signal into a plurality of sections, and to selectively insert the signal which is generated into the plurality of sections, and to output the communication signal.

Abstract: A method and system for assigning a carrier channel to a subscriber device (102) in an OFDM system is provided. The method includes estimating (602) a link impairment associated with the subscriber device. The method also includes assigning (604) the subscriber device to a carrier channel having a cyclic prefix that conforms to the link impairment. The link impairment is related to the delay spread of a link used by the subscriber device.

Abstract: A scalar Kalman filter is applied for a Least-Square estimated value Hs at s. The filter has an input for receiving Hs, a filter equation and an out for the corrected estimated value Hsk for the kth variable. The filter equation is Hsk=KgainSn[k] wherein: correction Sn[k]=S+Kn(Hs?S); prediction of the correction S=KaSn[k]; Kalman filter gain Kn=P/(1+P); minimum predication MSE P=Ka2Pn[k]+Kb; minimum MSE Pn[k]=P (1?Kn); and Ka, Kgain and Kb are constants.

Abstract: Method and system for synchronizing a receiver in an Orthogonal Frequency Division Multiplexing (OFDM) system. The method comprises transforming (105) a received signal from the time domain into the frequency domain to produce a transformed signal. The method further comprises rotating (110) each set of ranging tones of the transformed signal in the frequency domain based on a corresponding tone index to produce a set of phase-rotated frequency domain received ranging tones that is equivalent to time domain shifted ranging signals. Each ranging tone is rotated iteratively over a predefined set of delay-values and each delay-value within the predefined set of delay-values ranges from zero to a predetermined time delay. Also, the method comprises computing (115) a detection metric corresponding to each delay-value within the predefined set of delay-values based on the set of phase-rotated frequency domain received ranging tones.

Abstract: The present invention relates to a device for compensating a radio frequency distortion caused by a sample/hold operation of a digital/analog converter in an orthogonal frequency division multiplexing (OFDM) transmission system, and a method thereof. In a digital transmission system, an edge frequency signal of a transmission signal band is distorted by a sample/hold operation of a digital/analog converter such that a signal attenuation is generated at a frequency domain by a sync function having a zero point at a sample frequency of a transmission signal. In the present invention, the signal distortion may be compensated by multiplying a coefficient of an inverse sync function by a signal weight value at the frequency domain, and it may be compensated by using a single multiplier and a lookup table storing the coefficient of the inverse sync function.

Abstract: An apparatus and method for recovering a carrier frequency of a received signal using a predefined symbol in an OFDM system is provided. A maximum value detector detects at least three values and their corresponding offsets in descending order among auto-correlation values calculated within a specific frequency offset range between a received signal and a predefined symbol.

Abstract: Provided is a method for channel estimation increasing frequency band efficiency lost by using a pilot, and reducing sensitivity to channel zero, instability, and complexity. The method includes the steps of: (a) generating an i-th symbol block Si including N carriers; (b) performing an inverse fast Fourier transform (IFFT) operation on the i-th symbol block and forming an orthogonal frequency division multiplexing (OFDM) symbol block; (c) attaching a guard interval sample in front of the i-th OFDM symbol block Ui and forming at least one OFDM symbol block Ui,cp; and (d) modeling the formed OFDM symbol block Ui,cp with a channel finite impulse response (FIR) filter h and noise v and estimating channel impulse response using signals yi received through a channel.

Abstract: The present invention aims at ensuring both delayed wave resistance and fading resistance in good balance. A delay time measuring unit measures delay time determined based on a time point of a subcarrier out of a plurality of subcarriers arriving first and a time point of another subcarrier arriving through multipath at each predetermined time interval. A mode selector selects a mode out of a plurality of modes formed as combinations of a subcarrier interval representing an interval between mutually adjacent subcarriers out of the plurality of subcarriers and the guard interval depending on a length of the delay time. A first mode processor, a second mode processor or a third mode processor executes transmission and reception of a transmission signal by use of the selected mode.

Abstract: The present invention relates to signal transmitting/receiving apparatuses. The signal transmitting apparatus includes an inverse discrete Fourier transform module, a cyclic prefix adding module, a preamble adding module, and a digital-analog converting module. The inverse discrete Fourier transform module receives modulated data, performs inverse discrete Fourier transform, and generates a first symbol. The cyclic prefix adding module adds a predetermined cyclic prefix to the first symbol, and generates a second symbol. The preamble adding module adds a predetermined preamble to the second symbol, and generates a third symbol. The digital-analog converting module converts the third symbol including the cyclic prefix and the preamble into an analog symbol.

Abstract: A terminal demodulation apparatus previously stores a received frame signal in a memory before inputting the same into a fast Fourier transform (FFT) unit, performs a demodulation to necessary information read from the corresponding memory, and has a separate data subcarrier memory and pilot subcarrier memory, and uses the signal demodulation method mixed with a subcarrier allocation method so as to easily demodulate various subcarrier allocation methods.

Abstract: A DMT system and method with the capability to adapt the system bit rate on-line in a seamless manner. The DMT system provides a robust and fast protocol for completing this seamless rate adaptation. The DMT system also provides a framing and encoding method with reduced overhead compared to conventional DMT systems. The DMT system and method provide seamless rate adaptation with the provision of different power levels. This framing and encoding method enables a system with seamless rate adaptation capability. The system and method of the invention can be implemented in hardware, or alternatively in a combination of hardware and software.

Abstract: A DMT system and method with the capability to adapt the system bit rate on-line in a seamless manner. The DMT system provides a robust and fast protocol for completing this seamless rate adaptation. The DMT system also provides a framing and encoding method with reduced overhead compared to conventional DMT systems. The DMT system and method provide seamless rate adaptation with the provision of different power levels. This framing and encoding method enables a system with seamless rate adaptation capability. The system and method of the invention can be implemented in hardware, or alternatively in a combination of hardware and software.

Abstract: A method for correlatively encoding is used to improve spectrum performance, particularly for rectangular-pulse-shaped OFDM (Orthogonal Frequency-Division Multiplexing) signals no matter whether cyclic prefix or zero padding is added to the OFDM signals or not. In accordance with the method for correlatively encoding according to the present invention, OFDM signals can achieve high spectrum efficiency. In addition, the attenuation rate of signal sidelobes in spectrum gets faster, which prevents signal power from leaking out of the bandwidth, and thereby avoids interfering with signals of adjacent channels.

Abstract: Disclosed are an apparatus and a method for determining a transmit/receive antenna in a Multiple Input Multiple Output (MIMO) communication system. At least one sub-channel matrix including transmit antenna information and receive antenna information is generated. From the at least one sub-channel matrix, a sub-channel matrix having a maximum value Frobenius norm is determined. The transmit and receive antenna information are then extracted from the determined sub-channel matrix.

Abstract: In a method for allocating transmission power in a communication system including multiple antennas, a plurality of subcarriers are grouped by a plurality of groups, and each group includes at least one subcarrier. A transmission power weight and an antenna transmission vector are calculated for each group by using channel information, a transmission power for each group of each antenna is calculated by using the transmission power weight and the antenna transmission vector for each group, and transmission signals are transmitted through the multiple antennas after determining which signals need to be transmitted from the multiple antennas by using the transmission power.

Abstract: An Iterafive Detection and Decoding (IDD) receiving apparatus and method in a multiple input multiple output (MIMO) communication system. The IDD receiving apparatus includes an MIMO detector which generates soft decision values of coded bits by MIMO-decoding a receive vector, feedback priori information, and a list of candidate coded symbol vectors; a decoder which Soft-Input/Soft-Output (SISO)-decodes the soft decision values generated at the MIMO detector and feeds back soft decision values of the coded bits to the MIMO detector; a hard decision part which generates a coded symbol vector by performing a hard decision on the soft decision values generated at the decoder; and a list updater which generates a list of candidate coded symbol vectors using the receive vector and provides the list to the MIMO detector at a first iteration, updates the list using the coded symbol vector fed from the hard decision part, and provides the updated list to the MIMO detector at subsequent iterations.

Abstract: Embodiments for generating digital title and transmission information are disclosed.

Abstract: An integrated circuit radio transmitter includes a baseband processing module that is operable to generate digital data for transmission through a wireless interface, first transmission logic for generating first continuous waveform transmission signals, second transmission logic for generating second continuous waveform transmission signals, and third transmission logic for generating digital transmission signals. The integrated circuit radio transmitter also includes logic for selecting an output transmission signal format including at least one of the first continuous waveform transmission signals, the second continuous waveform transmission signals, and the digital transmission signals; and radio frequency (“RF”) transmission circuitry for receiving and transmitting the selected output transmission signal format.

Abstract: A communication apparatus used in a spectrum sharing environment in which multiple communication systems coexist using the same spectrum band is provided. The apparatus includes a transmission pulse shaper that performs bandwidth limitation on a pulse which is used to send data symbols; a monitoring unit that monitors in-band interference conditions from coexisting systems other than a target system to which the communication apparatus belongs, and availability of unused spectrum on adjacent channels of the target system; a controller that controls a pulse transmission period and a pulse width of the transmission pulse shaper based on the monitoring result; and a transmission unit that transmits the band-limited signal.