Abstract: A power control unit (500) for a power control system in a mobile communication system, the power control unit (500) comprising an inner power control loop element (503, 507), which generates a transmit power control command (504), and an outer power control loop element (516) connected to the inner power control loop element (503, 507), the outer power control loop element (516) being configured for providing a target value (506) to the inner power control loop element (503, 507). The outer power control loop element (516) comprises a soft information estimator (509) connected to at least one outer loop regulator (501, 502), wherein the soft information estimator (509) is configured to provide a soft information estimate (510) to the at least one outer loop regulator (503).

Abstract: Embodiments of an Ethernet transceiver are disclosed. The Ethernet transceiver includes a plurality of digital signal streams, at least one digital signal stream being coupled to another of the digital signal streams. A domain transformer transforms sub-blocks of each of the plurality of the digital signal streams from an original domain into a lower complexity domain. A processor joint processes the transformed sub-blocks of the digital signal streams, each joint processed digital signal stream sub-block is influenced by other digital signal streams sub-blocks. An inverse transformer inverse transforms the joint processed signal streams sub-blocks back to the original domain.

Abstract: A method and device for determining at least one traffic parameter in a data transmission system including at least one transmitter and one receiver, wherein the receiver includes a modem with equalizer. The method includes determining at least one piece of data given by the equalizer, wherein the piece of data includes the equalization error Ei; and determining one or more traffic parameters in taking account of the data provided, the fixed quality of service QoS and a relationship linking the quality of service and the equalization error Ei.

Abstract: An arrangement for measurement demodulation and modulation error measurement of a digitally modulated receive signal, which has a receive filter and a following demodulator for error compensation and for determining the ideal symbol samples. The measuring signal that is filtered in a reference filter and weighting filtered is then evaluated in a following evaluation circuit. The output signal of the demodulator is fed via a measuring filter to the evaluation circuit and the weighting filter function is formed by cascaded filter functions of the receiver filter and measuring filter.

Abstract: An adaptive equalization apparatus comprises an equalizer for equalizing a playback signal read from a recording medium, using tap coefficients; a maximum likelihood decoder for subjecting an equalized signal outputted from the equalizer to maximum likelihood decoding; a first delay unit for delay-adjusting the playback signal to make the signal coincide with the timing of a tentative decoded signal that is obtained in the process of maximum likelihood decoding; a second delay unit for delay-adjusting the equalized signal to make the signal coincide with the timing of the tentative decoded signal; and a coefficient adaptive controller for adaptively controlling the tap coefficients so that an error in the maximum likelihood decoding is minimized, on the basis of the tentative decoded signal, an output of the first delay unit, and an output of the second delay unit.

Abstract: A demodulated signal is to be generated by use of a first detection signal detected a presence/absence of a signal according to a correlation between a reception signal PPM-modulated at a pulse interval of T and a pulse variation width of ? and the reception signal delayed with a time (T+?), a second detection signal detected a presence/absence of a signal according to a correlation between the reception signal and the reception signal delayed with a time (T), and a third detection signal detected a presence/absence of a signal according to a correlation between the reception signal and the reception signal delayed with a time (T??). By thus combining a plurality of delayed detections, it is possible to obtain a UWB demodulating apparatus configured with a circuit suited for integrated circuit fabrication.

Abstract: This invention discloses a fast two-dimensional inverse Discrete Cosine Transform (iDCT) that adapts to compressed video source statistics to reduce execution time. iDCT algorithms for sparse blocks eliminate calculations for some zero coefficients and are implemented with quad-word parallel single-instruction-multiple-data (SIMD) multimedia instructions. It is observed that end-of-block marker value histograms vary little within single shots. An adaptive control mechanism is proposed that selects the optimal set of iDCTs to prepare for an entire shot from its first frames (to reduce software overheads and penalties). This introduces no degradation of decoded video quality as compared with a conventional SIMD 8×8 iDCT implemented with Intel MMX instructions.

Abstract: In a first exemplary media implementation, one or more processor-accessible media include processor-executable instructions that, when executed, direct a device to perform actions including: comparing an accuracy indicator to at least one threshold, the accuracy indicator corresponding to a reference macroblock selected for a target macroblock; ascertaining a refinement case from multiple refinement cases based on the comparing, each refinement case of the multiple refinement cases defining multiple test points in relation to the reference macroblock; and analyzing the ascertained refinement case with regard to the target macroblock.

Abstract: A noise filter for a video processing system includes a block selector, a cost calculator, a cost table, a cost comparator, and a coefficient filter. The block selector is coupled to receive data from the quantization unit and selects blocks for additional filtering. The selected blocks are provided to the cost calculator determines a cost for each of the coefficients in the block using the cost table and the costs are summed. The cost comparator compares the total to a threshold, and filters the coefficients using the coefficient filter if the total is greater a preset threshold. The noise filter to the VLC unit then outputs the filter data.

Abstract: The invention provides a method for compressing a group of basic media data units, the method comprising the steps of: (a) receiving the group of basic media data units; (b) for each basic media data unit of the group performing the steps of: (b1) partially decoding the basic media data unit; (b2) determining whether to reduce the size of the basic media data unit of the received block in view of a predefined relationship between a predefined compression ratio (PCRA) and a residual ratio (RR); (b3) reducing the size of the basic media data unit, in view of the determination, such that an optimal reduction to quality degradation of the basic media data block is achieved; and (b4) partially encoding the basic media data unit.

Abstract: A method of processing video frame data includes the steps of: receiving a video frame; partially decoding the video frame; fully decoding the video frame to produce macroblocks; determining video data parameters from the partially decoded video frame or both the partially and fully decoded video frame; and encoding the macroblocks based on the determined video data parameters to provide a compressed video frame for subsequent display.

Abstract: In a data transmission system, a server is provided with a data storage unit which holds plural video streams having different I-frame intervals, as coded data corresponding to the same video sequence, and a data transmission unit for transmitting a predetermined video stream among the plural video streams, according to a command signal Sc from a receiving terminal. The receiving terminal transmits a data designation signal (command signal) Sc which designates one of the plural video streams stored at the server end, to the server, on the basis of the contents of user setting. Therefore, at the receiving terminal, a video stream to be supplied from the transmitting end (server) can be selected between one having a high resistance to transmission error and one having a high video quality, according to the user's preference.

Abstract: A technique for improving image compression by pre-processing the image frames. In particular, methods for de-interlacing and noise reduction using combinations of median filters, applied both spatially and temporally, with and without motion analysis, are described.

Abstract: A technique for transmitting a spread spectrum signal using plural non-contiguous frequency bands separated by segments of frequency spectrum excluded from use involves: generating a digital time-domain spread spectrum signal; converting the time-domain signal to a frequency-domain signal via an FFT; excising a portion of the frequency-domain signal by selectively removing frequency bins of the frequency-domain signal to cause spectral nulling of the transmit signal at the frequencies of the excluded segments; and converting the excised frequency-domain signal to an excised time-domain signal via an inverse FFT, which is then converted to an analog signal for transmission.

Abstract: A wireless communication system can comprise two or more antennas that interfere with one another via free space coupling, surface wave crosstalk, dielectric leakage, or other interference effect. The interference effect can produce an interference signal on one of the antennas. A cancellation device can suppress antenna interference by generating an estimate of the interference signal and subtracting the estimate from the interference signal. The cancellation device can generate the estimate based on sampling signals on an antenna that generates the interference or on an antenna that receives the interference. The cancellation device can comprise a model of the crosstalk effect. Transmitting test signals on the communication system can define or refine the model.

Abstract: Aggregate channel reciprocity in a wireless system is supported by calibrating transmitter/receiver pairs.

Abstract: A receiver includes a channel decoder select circuit, a plurality of communication channels, at least one maximum ratio combiner circuit, and a forward error correction circuit. The plurality of communication channels receive wireless information from channel demodulators and are in communication with respective channel decoder circuits, which are in communication with the channel decoder select circuit. The at least one maximum ratio combiner circuit receives the wireless information from the plurality of communication channels. The output of the maximum ratio combiner is communicated to the forward error correction circuit, the output of which is communicated to the channel decoder select circuit. A pseudo bit error measurement feedback signal communicated to the maximum ratio combiner from one of the plurality of channel decoder circuits. A method for finding wireless satellite signals that minimizes errors in a receiver system is also disclosed.

Abstract: Apparatus and method are disclosed for selecting a transmit antenna diversity scheme according to a variation speed of a fading channel in a mobile communication system. A user equipment (UE) estimates a channel response of a pilot channel by receiving a pilot channel signal from a Node B; estimates a variation speed of a fading channel by using the estimated channel response and determining a transmit antenna diversity scheme suitable to the variation speed of the fading channel; and transmits feedback information including the determined transmit antenna diversity scheme to the Node B, so that the Node B can determine a transmit antenna diversity scheme for a channel signal to be transmitted to the UE based on the transmit antenna diversity scheme information included in the feedback information. In this way, the Node B adaptively applies a transmit antenna diversity according to a channel condition.

Abstract: A space-time coding arrangement for wireless communications is disclosed where the codes are generated through stochastic approximation. The codes can be optimized over a wide range of performance metrics, receiver structures, and channel characteristics.

Abstract: The present invention relates to a method for transmitting data including a bit interleaving step for permutating encoded data bits Tb before their transmission in the form of modulation symbols over Nt transmitting antennas. According to the invention, the bit interleaving step involves bit demultiplexing DMXS for extracting bit sequences Bsj (for j=0 to Nt) from the encoded data bits Tb, sequence interleaving SRIS for permutating the bits of each sequence Bsj (for j=0 to Nt), sequence storing and segmenting SQSS for dividing each interleaved sequence Isqj (for j=0 to Nt) into successive segments Psgj, and segment shifting SGS for applying circular shifts to simultaneous different segments Psgj (for j=1 to Nt). The invention enables to ensure that consecutive encoded bits see a maximum number of different communication channel states, and thus favours data diversity.

Abstract: Methods and apparatus are provided for improved efficiency in an extended multiple antenna communication system. A multiplier is employed on the number of points in the FFT that is greater than the multiplier on the frequency (bandwidth) of the legacy 802.11 a/g system. In one exemplary implementation, a 256 point FFT is employed in 40 MHz (with a 4N multiplier on the number of possible tones and a 2N multiplier on the frequency). While the efficiency for the OFDM symbol is improved, additional overhead is required in the preamble training (the length of the preamble is proportional to the number of tones in the FFT). Thus, a number of preamble constructs are provided that couple the improved efficiency with shorter preambles. In addition, an improved tone design provides additional efficiency gains.

Abstract: A transmitter circuit for transmitting a sine wave modulated with digital data, where the sine wave includes a clock signal, and a receiver circuit for demodulating the transmitted sine wave, where the receiver circuit extracts the clock signal and the digital data from the sine wave. The transmitter circuit includes digital logic components that allow the transmitted sine wave to include at least one bit per cycle of the sine wave, and the receive circuit includes digital logic components that allow the clock signal and the digital data to be extracted from the sine wave. In various embodiments, the transmitted sine wave includes one bit per cycle, one bit per half cycle, multiple bits per cycle and multiple bits per half cycle.

Abstract: A system for linearizing RF amplifiers employing baseband predistortion techniques provides additive or multiplicative predistortion of the quadrature (I/Q) input signal. The predistorter uses a discrete-time polynomial kernel to model the inverse transfer characteristic of the amplifier, providing separate and simultaneous compensation for nonlinear static distortion, linear dynamic distortion and nonlinear dynamic effects including reactive electrical memory effects. A predistortion controller monitors and compares the amplifier output with the quadrature input signal to compute estimates of the residual output distortion of the amplifier. Output distortion estimates are used to adaptively compute the predistorter parameter values in response to changes in the amplifier's operating conditions. The computed values are used in the predistorter.

Abstract: In a mobile communication system, receivers measure channel characteristics using a received reference channel signal. The receivers determine a weight which has orthogonality with respect to each of a preset number of weight vectors in the mobile communication system and has the highest signal-to-interference-and-noise ratio, and feedback the weight and the corresponding signal-to-interference-and-noise ratio to the transmitter. The transmitter interprets the feedback information output from the receivers and determines receivers having feedback information which are orthogonal to each other and have the maximum throughput as an addition capacity when transmitted simultaneously, and determines weights based on the feedback information of the receivers having the maximum throughput. By applying the determined weights to the antennas using a well-known beam forming scheme, data can be transmitted to each of the determined receivers.

Abstract: A system for implementing Incremental Redundancy (IR) operations in a wireless receiver includes a baseband processor, an equalizer, a system processor, and an IR processing module. The baseband processor receives an analog signal corresponding to a data block and samples the analog signal to produce samples. The equalizer receives the samples from the baseband processor, equalizes the samples, and produces soft decision bits corresponding to the data block. The equalizer may be implemented as a distinct processing component or may be performed by the baseband processor or system processor. The system processor receives at least the soft decision bits and initiates IR operations. The IR processing module receives the soft decision bits of the data block and performs IR operations on the data block in an attempt to correctly decode a corresponding data block.

Abstract: An OFDM receiver is configured for suppressing pilot energy, and DC energy, from received I and Q components prior to estimating amplitude and phase imbalances of the received I and Q components. Hence, amplitude and phase imbalances can be estimated accurately despite channel fading and frequency variations between the transmitter and receiver.

Abstract: In a method and device to demodulate a signal in a packet communications system, the signal comprises at least one burst representing data samples relative to one or more users. The method comprises at least one step of phase estimation and tracking during at least the duration of the burst in using a frequency assumption test.

Abstract: A carrier recovery device of a digital TV receiver is disclosed, which can stand a multiple path noise. In the carrier recovery device, it is possible to recover a carrier with a phase error component of the carrier existing on data blocks as well as a carrier signal, whereby it has the carrier recovery function even in case a carrier recovery unit is not operated properly.

Abstract: A system for mitigating impairment in a communication system includes a delay block, a signal level block, a moving average window block, an impulse noise detection block, and a combiner. The delay block receives and delays each chip of a plurality of chips in a spreading interval. The signal level block determines a signal level of each chip of the plurality of chips in the spreading interval. The moving average window block determines a composite signal level for a chip window corresponding to the chip. The impulse noise detection block receives the signal level, receives the composite signal level, and produces an erasure indication for each chip of the plurality of chips of the corresponding chip window. The combiner erases chips of the plurality of chips of the spreading interval based upon the erasure indication.

Abstract: The present invention is a channel estimator based on the values of received data and on a priori probabilities only of received symbols. The channel estimator includes a symbol probability generator, a noise variance estimator and a channel tap estimator. The symbol probability generator generates a priori probabilities only of transmitted symbols found in the received signal(s). The noise variance estimator estimates at least one noise variance corrupting the received signal(s). The channel tap estimator generates channel estimates from the received signal(s), the a priori probabilities and the noise variance(s).

Abstract: A path metric computation method and apparatus for estimating a maximum likelihood sequence in a wireless communication network. The proposed method applies the statistical properties of estimated channel impulse response to reduce the computational load. A threshold is set to check the significance of each autocorrelation value in order to determine the contribution to the path metric increment. The corresponding terms in the path metric equation with insignificant autocorrelation values are thus discarded to reduce the complexity of path metric computation.

Abstract: Methods, apparatuses, and systems are presented for deriving data from an error correction encoded composite signal involving (a) receiving a composite signal comprising contributions from a plurality of individual signals transmitted over different paths representing a common data sequence encoded using an error correction code, (b) calculating soft values of a first type taking into account the received composite signal and soft values of a second type, (c) generating symbol outputs by taking into account soft values of the first type, (d) calculating soft values of the second type taking into account symbol outputs, (e) feeding back soft values of the second type, (f) iteratively updating soft values of the first type, symbol outputs, and soft values of the second type by repeating previous steps, and (g) performing error correction decoding taking into account updated symbol outputs, to generate error correction decoded outputs.

Abstract: A frequency estimation method of multiband (MB)-orthogonal frequency division multiplexing (OFDM) ultra wide band (UWB) system using an Alt-PHY time frequency (TF) hopping strategy based on IEEE 802. 15. 3a. includes the steps of: a) selecting a predetermined number of frequencies among a plurality of center frequencies based on a predetermined number of OFDM symbols and estimating relative frequency offsets for selected frequencies; b) obtaining an average relative frequency offset by averaging the estimated relative frequency offsets when two or more frequencies are selected at the step a); and c) obtaining real frequency offsets for each of the center frequencies by transforming the obtained average relative frequency offset to the real frequency offsets and compensating a frequency offset caused by a transmitting/receiving local oscillators based on the obtained real frequency offsets.

Abstract: When a radio communication terminal including an AGC receiver starts, a set gain of the AGC receiver is switched in a short updating period. At this time, the terminal switches among antennas, and calculates and stores a received power of a received radio signal through each antennal. This calculation is performed a predetermined number of times for each antenna. After that, the terminal compares the calculated received powers of the radio signal through each antenna, and fixedly uses, as a receiving antenna, one of the antennas which receives a signal with the largest power.

Abstract: A receiver 100 for receiving a multi-carrier signal comprises detection means for detecting 801 the presence of impulse interference within the signal and identifying one or more samples of the signal affected by the impulse interference, means for selecting samples to be blanked, means for blanking the selected samples and means 805 for estimating the blanked signal. The selected samples comprise those samples (l0 to l0+k) identified as being affected by impulse interference and at least one of the following: a number of samples x1 preceding the said identified samples (l0 to l0+k) or a number of samples x2 following the said identified samples (l0 to l0+k). The blanking means may define the length of a blanking window 301 to have one of a plurality of different predetermined lengths, using the smallest of the predetermined lengths sufficient to encompass the selected samples.

Abstract: A system for receiving a composite signal including a main component and a multipath component includes a demodulator chain having adaptive circuitry controllable in response to a control signal to compensate for the multipath component. In this system, a control signal generator includes a phase error estimator, which generates a signal representing an estimate of the phase error between the received main component and the received multipath component. A controller generates the control signal in responsive to the phase error signal.

Abstract: A mobile communication system is designed with an input circuit coupled to receive a first plurality of signals (rj(i+?j), i=0?N?1) during a first time (T0-T1) from an external source and coupled to receive a second plurality of signals (rj(i+?j), i=N?2N?1) during a second time (T1-T2) from the external source. The input circuit receives each of the first and second plurality of signals along respective first and second paths (j). The input circuit produces a first input signal (Rj1) and a second input signal (Rj2) from the respective first and second plurality of signals. A correction circuit is coupled to receive a first estimate signal (?j1), a second estimate signal (?j2) and the first and second input signals. The correction circuit produces a first symbol estimate ( S1) in response to the first and second estimate signals and the first and second input signals.

Abstract: A programmable logic device (“PLD”) is augmented with programmable clock data recover (“CDR”) circuitry to allow the PLD to communicate via any of a large number of CDR signaling protocols. The CDR circuitry may be integrated with the PLD, or it may be wholly or partly on a separate integrated circuit. The circuitry may be capable of CDR input, CDR output, or both. The CDR capability may be provided in combination with other non-CDR signaling capability such as non-CDR low voltage differential signaling (“LVDS”). THE CDR circuitry is provided with a programmable serializer and/or deserializer that can support higher data clock rates than the highest clock rate associated with the reference clock signal or clock signal from a phase locked loop circuit.

Abstract: A method for generating an ultra-wide-band (UWB) having a reduced discrete frequency component defines frame synchronization signal and an inverted frame synchronization signal. As each frame is generated, the method randomly selects the frame synchronization signal or the inverted frame synchronization signal to be included with the frame. The frame synchronization signal is detected by a correlator and the magnitude of the correlation is used to indicate the detection of the frame synchronization signal.

Abstract: Disclosed herein is a false lock detection circuit including: a data signal input section receiving an input of a data signal; a clock signal input section receiving an input of a clock signal generated from the data signal; a pattern detector obtaining the data signal on a basis of the clock signal, and detecting a data pattern in which adjacent pieces of data at at least three consecutive bits differ from each other; a phase period shift detector detecting a shift between periods of phases at a change point of the data signal and a change point of the clock signal; and a determining section determining whether a false lock has occurred on a basis of results of detection of the pattern detector and the phase period shift detector.

Abstract: A dual loop (PLL/DLL) data synchronization system and method for plesiochronous systems is provided. In particular, a system and method for dual loop data synchronization using a granular FIFO fill level indicator is provided. A dual loop data serializer includes a phase lock loop (PLL) and a delayed lock loop (DLL) configured with a phase shifter in the feedback path of the PLL. The dual loop serializer locks to the input of the DLL, which represents a fill level of a FIFO. A granular FIFO fill level indicator of the DLL provides input to the phase shifter to adjust the frequency of the PLL accordingly. Thus, the frequency of the data input rate can be controlled and a constant fill level of the FIFO can be maintained. A dual loop retimer includes a dual loop serializer (PLL/DLL) and a clock recovery DLL. The retimer resets the jitter budget to meet transmission requirements for an infinite number of repeater stages.

Abstract: A clock and data recovery (CDR) device is disclosed that is capable of recovering a clock signal from a data signal that has a variable data rate. The CDR device includes a reference clock generating section for dividing a basic clock by a first predetermined value P, synchronizing the clock and multiplying the clock by a second predetermined value Q to generate a reference clock corresponding to the variable data rate; a clock and data recovery section for receiving the transmitted data, recovering a clock and data from the received data and outputting the recovered clock and data; and a control section for generating a control signal according to the variable data rate and sending the signal to the reference clock generating section and the clock and data recovery section.

Abstract: There is provided a device and method for transmitting packet data in a mobile communication system. A sub-code generator generates a plurality of sub-codes with the same or different code rates for the input of a PLP (Physical Layer Packet) information bit stream. A controller determines a minimum data rate by which the number of the modulation symbols of a sub-code generated by a predetermined modulation method is equal to or greater than the number of transmittable modulation symbols for each time period. A symbol pruner prunes part of the modulation symbols of the sub-code to make the number of the modulation symbols of the sub-code equal to the number of transmittable modulation symbols for the time period, if the number of the modulation symbols of the sub-code is greater than the number of transmittable modulation symbols for the time period.

Abstract: In a method of determining an operating margin to a given operating limit in a nuclear reactor, operational plant data from an on-line nuclear reactor plant is accessed, and reactor operation is simulated off-line using the operational plant data to generate predicted dependent variable data representative of the given operating limit. The predicted dependent variable data is normalized for evaluation with normalized historical dependent variable data from stored operating cycles of plants having a similar plant configuration to the on-line plant. A time-dependent average bias and a time-dependent uncertainty value for the predicted dependent variable data are determined using the normalized historical dependent variable data, and a risk-tolerance level for the on-line plant is obtained.

Abstract: A bidirectional shift register includes a former stage multiplexer, a latter stage multiplexer, a former stage full-swing shift register, and a latter stage full-swing shift register, all of which have a plurality of registers all of the same type. The former and the latter stage multiplexers output signals according to a forward clock, a backward clock, a forward control signal, and a backward control signal. The former and the latter stage full-swing shift register store the signals output from the former and the latter stage full-swing shift registers respectively.

Abstract: An integrated circuit device having an output driver circuit and a control circuit. The output driver circuit outputs a first signal having a signal level according to a control value. The control circuit is coupled to receive the first signal from the output driver and adjusts the control value by a first increment until a transition event is detected. After the transition event is detected, the control circuit adjusts the control value by a second increment, the second increment being smaller than the first increment.

Abstract: The present invention provides a novel method for transferring SCCP messages to one of a plurality of entities in an entity set. The method receives a SCCP message from which a traffic type for said received message is determined. A global title associated with said received message is then translated to a destination entity set. For each entity in the destination entity set, a maximum allowed rate for receiving messages of said traffic type at that entity and a current rate for transferring messages of said traffic type to that entity are determined. The method then determines a subset of entities for which the current rate is smaller than or equal to the maximum allowed rate. If the subset contains at least one entity, the method selects one entity from the subset and transfers the SCCP message to said selected entity. The invention also provides an advanced signaling transfer point STP.

Abstract: An image reconstruction area of a subject is divided into a plurality of image data segments, among projection data obtained by projection, projection data segments necessary for back projection processing are cut out for every image data segments and back projection processing is performed for every image data segments by making use of the cut out projection data segments. Further, detector addresses of the projection data to be used for the back projection processing are obtained from a plurality of limited number of detector addresses within the concerned image data segment region. As a result, a device is realized which permits to produce a high quality tomographic image with high speed by using a small amount of a high speed memory.

Abstract: A method and system are presented for generating a DRR of an anatomical region so that the visibility within the DRR of one or more skeletal reference structures is enhanced. 3D scan data, which have been obtained from a 3D scan of the object conducted at a 3D scan energy level, are provided. The 3D scan data are modified to compensated for a difference between the ratio of bone-to-tissue attenuation at the 3D scan energy level, and the ratio of bone-to-tissue attenuation at the intensity of the imaging beam which the DRR emulates. The modified 3D scan data are related to the raw 3D scan data by a non-linear, exponential relationship. A plurality of hypothetical rays are cast through the modified 3D scan data, from the known geometry of the imaging beam. The 3D scan data are integrated along each hypothetical ray, and the integrated values are projected onto an imaging plane.

Abstract: Various configurations for scatter reduction and control are provided for CT imaging. These configurations include an imaging system having a stationary detector extending generally around a portion of an imaging volume and a distributed X-ray source placed proximal to the stationary detector for radiating an X-ray beam toward the stationary detector. A scatter control system is further provided that is configured to adaptively operate in cooperation with the stationary detector and the distributed X-ray source to focally align collimator septa contained therein to the X-ray beam at a given focal point and to provide X-ray beam scatter control.