Abstract: A receiving unit, receiving method, and semiconductor device that reduce the size of circuits in a receiving unit. A receiving section receives signals sent from a base station and transmitted through a plurality of paths. A path tracking section detects timing of each of the plurality of paths through which the signals received by the receiving section were transmitted. A demodulating section demodulates the received signals by performing a despreading process according to the timing of the plurality of paths detected by the path tracking section. A correlation value calculating section calculates a correlation value between the received signals and a spreading code.

Abstract: A digital matched filter includes a spread code generating unit, a spread code holding unit, a reception signal holding unit, a tap calculating unit, an adding unit and a correction value generating unit. To the tap calculating unit, a tap output is provided from the reception signal holding unit, and a tap coefficient is provided from the spread code holding unit. A code control unit is provided in the tap calculating unit for each corresponding tap output and tap coefficient. The code control unit provides an output corresponding to the tap output with or without inversion in accordance with the tap coefficient. A correction value generated by the correction value generating unit is added to the sum of the outputs from the code control units. Thus, an error in a correlation value output is corrected.

Abstract: A method for the serial transmission of digital data from a transmitter to a receiver is described. In the method, at least one data word is transmitted which has a plurality of bits. Also transmitted is an associated error bit which indicates whether the generation of the data word was error-free. Likewise, a plurality of associated test bits are transmitted, from which it is possible to deduce whether the transmission of the data word and of the error bit was error-free.

Abstract: A multi-tone modem processes an input data stream 10 and uses an inverse Fourier transform 24 to produce a stream of multi-tone symbols 26 fed to an analogue front end 146. A model 32 models the subsequent processing in the analogue front end 146 and outputs a control signal 184 that controls the analogue front end 146 accordingly.

Abstract: A Multi-tone transmission system processes input data through a plurality of intermediate processing stages 12, 14, 16 and corresponding stages of intermediate data 18, 20. A symbol including a number of tones is obtained therefrom by an inverse Fourier transform 24 and stored in a buffer 158. The peak amplitude contained in the symbol is detected 28 and compared with a threshold. If the peak amplitude in the symbol exceeds the threshold, the symbol stored in the buffer 158 is regenerated.

Abstract: Channel equalization in a 1000BASE-T receiver is performed by a fixed mode analog filter 2 suitable for the longest possible cable length, by a FFE (3), and by a digital filter 4. The digital filter (4) has two sets of taps. One set is optimal for shorter cable lengths and so cancels adaptation for long cable lengths and assists operation of the analog filter. A decision block (5) selects an appropriate set of taps.

Abstract: This invention discloses an adaptive equalizer disposed on the front end of a receiver to improve the quality of a transmission signal comprising a data signal from a transmission cable. The signal compensation of the adaptive equalizer uses a long T as its observation unit when the transmission cable is idle, and uses a short T as its observation unit when the transmission cable is transmitting data signals. This invention further discloses a baseline wander compensator worked with the adaptive equalizer during the transmitting data period of the transmission cable. The disclosed adaptive equalizer can achieve its optimal processing effects.

Abstract: An apparatus and method for encoding quantized frequency represented data, the data comprising zero and non-zero represented data is claimed. For zero represented data, a zero run length is determined. A Golomb parameter is determined as a function of the zero run length. A quotient is encoded as a function of the zero run length and the Golomb parameter. A remainder is encoded as a function of the zero run length, the Golomb parameter and the quotient. The coded quotient and the coded remainder are concatenated. For non-zero represented data, the nonzero data is encoded as a function of the non-zero data value and the sign of the non-zero data value.

Abstract: A drift reduction method and apparatus. Drift reduction is effected in an MPEG video transcoder by decoding dropped out pixels to form a drift reference frame. The quantization indices in the current macro-block are changed accordingly in a drift reduction process. The compensated quantized frame is then variable length coded to an MPEG bitstream.

Abstract: Disclosed is a loop filtering method in a video coder enabling to provide an easy real-time processing by reducing a calculation quantity of a video coder in realizing a H.26L standard system and increase a video quality by removing a blocking and a ringing phenomenon of a compression moving picture in accordance with a coded block pattern, a quantization step size, and a motion vector size. The present invention includes the steps of determining a strength of a block to be processed in accordance with a coded pattern and a quantization step size of a first macro block(block1, block2) constituted by 4×4 block unit, carrying out a first loop filtering on the first macro block(block1, blockk2) in accordance with the determined strength, and carrying out a second loop filtering on a block located at a boundary region of a second macro block constituted by 16×16 block unit so as to remove a blocking existing at the boundary region of the second macro block.

Abstract: A video object encoding system and method that dynamically selects a mask type based on the characteristics of the video object. The system comprises an object evaluation system that evaluates a video object using a predetermined criterion; and a mask generation system that generates one of a plurality of mask types for the video object based on the evaluation of the video object.

Abstract: The invention relates to a method for encoding a sequence of frames by means of a three-dimensional (3D) subband decomposition involving a filtering step applied to the frames considered as a 3D volume. The decomposition is applied to successive groups of frames after the implementation, on the frames of each group, of motion estimation and compensation operations in the low frequency temporal subbands at each level of the temporal decomposition, the compensation operation leading, among the filtered pixels, to double-connected pixels corresponding in the current frame to regions of the reference frame becoming uncovered during motion. According to the invention, the identification step of double-connected pixels is followed by a decision step based on a minimization criterion and provided for choosing in the current frame, for the temporal filtering of a double-connected pixel of the reference frame, the pixel that leads to a minimum energy of the detail subband.

Abstract: A method describes activity in a video sequence. The method measures intensity, direction, spatial, and temporal attributes in the video sequence, and the measured attributes are combined in a digital descriptor of the activity of the video sequence.

Abstract: A method of data compression. A multiple-level wavelet transform transforms image data of an original image. Motion compensation is performed on a low-frequency band of the transformed image data. This band is then inversely transformed and used to reconstruct a portion of the original image. The remaining portions of the original image are then reconstructed from that portion. This image data then becomes the basis of the next level of the wavelet transform and is transformed back into the wavelet domain. This process is repeated until all of the levels of the wavelet transform have been used.

Abstract: A decoding apparatus is provided with a decoder for receiving plural bit streams and decoding the respective bit streams to output decoded bit streams, and a decoding state holder for saving and restoring plural states of the decoder. The decoder selects a bit stream to be a target of decoding, from among the plural bit streams to be decoded, and decodes the selected bit stream, performs saving and restoration of its state into/from the decoding state holder, outputs plural decoding results to the corresponding destinations, and completes a series of processes mentioned above within a predetermined period of time corresponding to each bit stream. Therefore, the plural bit streams can be decoded apparently at the same time, using a single decoder.

Abstract: The invention is related to methods and apparatus that conceal errors in images of a corrupted video bitstream. One embodiment conceals errors in a missing or corrupted intra-coded macroblock by linearly interpolating data from other macroblocks that correspond to portions of the image above and below the missing or corrupted macroblock. One embodiment can utilize substitute motion vectors for a missing or corrupted predictive-coded macroblock. Another embodiment doubles the received motion vectors and references the doubled motion vectors to a previous-previous frame. Another embodiment adaptively selects which concealment or reconstruction technique is applied according to projected error estimates. Another embodiment conceals errors by replacing corrupted or missing data by combining concealment data in a weighted sum to reduce an estimated error.

Abstract: A method (700) of customizing the selection of channels among a plurality of channels includes the steps of receiving (702) a digitally encoded bit stream over-the-air on the plurality of channels and decoding (704) a selected channel among the plurality of channels. The method further comprises the steps of selectively tagging (706) a desired type of content on the selected channel, analyzing (708) a broadcast information channel and/or an Electronic Program Guide for an indication of content of the desired type among the plurality of channels, and alerting (710) a user of a desired channel containing the indication.

Abstract: Interference rejection (85) can be applied to a wireless communication signal with reduced computational complexity by producing from a sample vector (y) a plurality of vectors (w) that are smaller than the sample vector. The interference rejection operation can then be applied to each of the smaller vectors individually to decide communication symbols represented by the sample vector.

Abstract: The communication apparatus comprises a turbo encoder. This turbo encoder includes a first recursive systematic convolutional encoder which convolutionally encodes two information bit sequences to output first redundant data, and a second recursive systematic convolutional encoder which convolutionally encodes the information bit sequences subjected to an interleave process to output second redundant data. The first and second recursive systematic convolutional encoders are encoders which search all connection patterns constituting the encoders and which satisfy optimum conditions that an interval between two bits ‘1’ of a self-terminated pattern is maximum in a specific block length and that a total weight in the pattern having the maximum interval is maximum in the specific block length.

Abstract: Path metric normalization in calculating trellis-based algorithms is improved by normalizing the path metric with an average value (rather than a maximum or a minimum) of the path metrics. Using an average rather than a maximum or a minimum provides various advantages without adversely affecting the execution of the trellis-based algorithm. Due to the relatively faster computation time available when an average is computed, average value normalization can be applied every cycle, because its critical path is less than that of the ACS unit.

Abstract: A method and apparatus for achieving combined beamforming and transmit diversity for frequency selective fading channels in a communication system having a base station with multiple transmit antennae and a mobile terminal with at least a single receive antenna, the method comprising the steps of: providing a signal to be transmitted; space-time encoding the signal to produce at least two separate signals, each on a respective output; feeding each output signal to a multiple access transmit processor to produce an output signal; applying respective selected transmit beamforming weights to each output signal; feeding the respective weighted signals to a signal combiner to perform a summing function of the signals and produce a signal for transmission; feeding the summed signal to each of the multiple transmit antennae for transmission; transmitting the signals over respective physical channels; receiving the transmitted signal at at least a single receive antenna; feeding the transmitted signal to a multiple a

Abstract: A transmitter comprising circuitry (14) for converting input bits to a plurality of symbols; and circuitry (24x) for forming a complex conjugate of signals corresponding to selected ones of the plurality of symbols. The selected ones of the plurality of symbols consist of signals corresponding to some and less than all the plurality of symbols. The transmitter also comprises circuitry (28x) for space time encoding both the signals corresponding to the selected ones of the plurality of symbols and signals corresponding to non-selected ones of the plurality of symbols. Lastly, the transmitter comprises a plurality of transmit antennas (TATx) coupled to transmit signals in response to the circuitry for space time encoding.

Abstract: In an apparatus for a TFCI mapping in a wireless communication mobile station, and a method thereof, the apparatus includes an encoding unit for encoding a TFCI transmitted from a main control unit as a CPU; a TFCI mapping unit for generating necessary control parameter and a TFCI code by using a signal encoded by the encoding unit and a signal transmitted from the CPU; and a CPU for controlling the encoding unit and the mapping unit.

Abstract: A system and method for post filtering signal peak reduction adapted for use in a multi-carrier communication system incorporating a source of a multi-carrier communication signal band limited in plural bands corresponding to the plural carriers. A first signal path receives as an input the band limited multi-carrier communication signal. A second parallel signal path includes a peak reduction calculation circuit for calculating a peak reduction correction signal and a plurality of filters providing a plurality of parallel filtering operations on the peak reduction correction signal corresponding to the plural bands to which the communication system is limited. The filtered peak reduction correction signals and delayed input signal are combined to provide peak adjusted output signals without violating the band limits of the communication signal or the modulation scheme of the communication signal.

Abstract: The invention creates a method for adapting filter cut-off frequencies for the transmission of discrete multitone symbols, where a transmit symbol datastream consisting of discrete multitone symbols is applied to an interpolation device, the transmit symbol datastream is interpolated with a symbol rate in the interpolation device, an interpolated symbol datastream is filtered in a first low-pass filtering device in accordance with a first filter cut-off frequency, which can be predetermined by a first filter cut-off frequency determining device, a digital symbol datastream obtained after a digital-analog conversion, transmission and analog-digital conversion, is filtered at the receiver end in a second low-pass filtering device in accordance with a second filter cut-off frequency, which can be predetermined by a second filter cut-off frequency determining device, in order to provide an equalized symbol datastream, the equalized symbol datastream is decimated in a decimation device and the decimated received s

Abstract: A channel quality assessment with short assessment time and good frequency resolution is disclosed. Some channels are grouped and their detecting results are collected as whole to determine the channel quality. The channel quality is determined by interference collision ratio, which is the ratio of the number of interference events to the sum of the number of interference events and interference-free events. Interfered channels are disabled form the group. The Channel quality of each of said plurality of channels is determined from detection results of each of said plurality of groups so as to have a short assessment time and meanwhile a good frequency resolution may be retained.

Abstract: This invention discloses a receiver and a signal compensation method therefor. An adaptive equalizer and a baseline wander compensator are provided on the front end of the receiver to improve the quality of output signals. The signal compensation method enables the adaptive equalizer to use a long T as its observation unit when the transmission cable is idle, and enables the baseline wander compensator for operation and controls both the adaptive equalizer and the baseline wander compensator to use a short T as its observation unit when the transmission cable is transmitting data signals. The disclosed adaptive equalizer can achieve its optimal processing effects, and the efficiency of the baseline wander compensator can be increased.

Abstract: An integrated circuit and a method for tuning an internal clock signal with respect to data that is to be emitted includes an adjustment circuit with a compensating circuit for synchronizing the internal clock signal with respect to the data that is to be emitted. Setting data, which is dependent on first adjustment data and on second adjustment data, is applied to the compensating circuit. The first adjustment data is determined using a tuning method during the front-end test, and is stored in a read only memory. The second adjustment data is determined in a fine-tuning method in the finished manufactured component, and is stored in a read/write memory.

Abstract: Wireless communication network dynamically assigning communicators to allocated channels by considering the interference and noise environment to maximize the number of communicators and effective bandwidth of the channel. The present invention provides a digital wireless modem capable of measuring interference and noise in a channel, signaling the information on a control channel, accepting dynamic channel assignments from a controlling element and demodulating signals in the presence of interference and noise. The modem uses a demodulator capable of recovering information from data signals in the presence of noise and interference stronger than the primary signal, and there is a controlling element for transmitting noise and interference measurements to a central network controller and a controlling element for determining channel assignments with the central network controller and setting the modem to the correct transmission and reception channel.

Abstract: A cooperative code-enhanced multiuser communications system having a receiver for resolving user ambiguity in a received composite signal by using convolutional encoder state machine properties to analyze strings of bit sums and separate out individual user data. The receiver comprises a signal sampler which converts a received composite signal to a digital data. A single point cluster mapper determines a closest pseudo-constellation point, and the pseudo-constellation point is formed with the aid of power and timing control in the transmitters. A bit sum look-up table maps symbol points to bit sums. A deterministic loop tests for bit sum cases where symbols can be determined immediately. A guess loop tests the bit sum after the deterministic loop test and performs guesses until all bits are decided. The bit sum is provided to a multiuser convolutional decoder to decide all user data streams.

Abstract: In case that a difference between a frequency of an input signal, which has been subjected to a quadrature modulation, and a frequency of an oscillator is large, a center of spectrum of a mixer output signal shifts, and strays from a pass band of a roll-off filter. As a result deterioration of a bit error rate characteristic is leading. A phase rotator is provided at a front stage of the roll-off filter, and a phase rotation operation of the phase rotator allows abase band signal to transmit through the pass band of the roll-off filter. Moreover, in a state where a carrier synchronization is not established, a signal which changes its frequency by a range in accordance with an amplitude of a periodic waveform signal is output to the phase rotator, and a central frequency of the base band signal is swept by the phase rotator, whereby the base band signal transmits through the pass band of the roll-off filter.

Abstract: A search path recovery mechanism for a sequential decoder employs a prescribed self-concatenated “Loeliger” convolutional code, that is either decodable by the sequential decoder for data recovery, or is decodable (although sub-optimally) by a Viterbi decoder as an adjunct to the sequential decoder to improve statistics during path recovery. The Viterbi decoder is incorporated in an alternate decoder which includes metric calculators, that compute branch metrics, that are alternately coupled to the Viterbi decoder, operating at twice the symbol rate. Using estimate bits from the Viterbi decoder, a syndrome former estimates the recovered state and generates an estimate of the validity of the recovered state. Their validity is verified by a path recovery detector, which operates as a zero error detection filter by summing a prescribed number of previous syndrome former outputs.

Abstract: A timing recovery scheme demarcates a complete range of inter-symbol interference free (ISI-free) sampling positions available in a cyclically extended symbol. The timing recovery scheme computes an ensemble correlation between the cyclic extension and the data part of symbols to estimate timing. The ensemble correlation function retains delay-spread and timing information by separately maintaining the correlation value for each sample position within the symbol duration and combines the correlation values for identical sample positions over an ensemble of symbols. In this manner, the scheme not only provides timing estimates, but can also provide estimates of the multipath delay-spread in a channel. The delay-spread estimates provide valuable information about the nature of the channel. A receiver can use this information, for example, to adjust the frequency-domain channel interpolation filter bandwidth in order to improve performance for the given channel condition.

Abstract: A null-pilot symbol assisted fast automatic frequency control (AFC) system for coherent demodulation of carrier phase modulation (CPM) includes (209) a pilot clock driven phase differentiator (252,253,255) for operating once every pilot clock cycle to determine the difference between the phase at a current pilot symbol location and the phase at a previous pilot symbol location. A frequency offset selector (256) is then used for choosing the most likely frequency offset from amongst a set of all frequency offsets that give rise to the same phase difference.

Abstract: An automatic frequency control (AFC) system adapted to compensate for an insufficient capture range is described herein. The AFC system may be implemented in a mobile station for use with a wireless communications system such as code division multiple access (CDMA). The AFC system determines if a transmission frequency is within a capture range. The AFC system modifies a reference frequency generated by the mobile station if the transmission frequency is not within the capture range.

Abstract: An adaptive automatic gain control loop in a radio receiver includes an amplifier with an adjustable gain to variably increase or decrease the signal level of the received signal. Plural data blocks are received, with each data block potentially having a different signal level when received. Before or at the very beginning when substantive data in a data block are processed in the amplifier, the gain of that amplifier is rapidly adjusted or preset to a predetermined signal level for that data block. By adapting the gain of the amplifier before or just as the data in the block are processed by the amplifier to an appropriate level, the received signal can be adjusted to a desired dynamic range. For example, by adapting the received signal level to the dynamic range of an analog-to-digital converter of a receiver, e.g., a UTRA/TDD or TD-SCDMA receiver, the bit error rate at the start of the data block is decreased.

Abstract: A digital broadcast receiver has a function of selecting, at the time of receiving a digital broadcast, signals to be fed back to an AGC circuit depending on whether an analog broadcast channel exists adjacent to a channel to be received or not. When an analog broadcast channel exists adjacent to a channel to be received, a feedback system change-over switch is connected to a second feedback system and the voltage level of analog signals detected by an analog signal level detecting circuit is fed back. When an analog broadcast channel does not exist adjacent to the channel to be received, the feedback system change-over switch is connected to a first feedback system, and the voltage level of digital signals in a demodulating IC detected by a digital signal level detecting circuit is fed back. In such a manner, reception performance is improved.

Abstract: Embodiments of the present invention relate generally to receivers. One embodiment relates to a digital FM receiver having multiple sensors (e.g. antennas). In one embodiment, the digital receiver includes a baseband unit having a channel processing unit. In one embodiment, the channel processing unit is capable of calculating or estimating a phase difference between the incoming signals prior to combining them. One embodiment uses phase estimation method for diversity combining the signals while another embodiment utlizes a hybrid phase lock loop method. Also, some embodiments of the present invention provide for echo-cancelling after diversity combining. An alternate embodiment of the channel processing unit utilizes a space-time unit to diversity combine and provide echo cancelling for the incoming signals.

Abstract: The present invention provides a diversity receiving device with superior interference resistance in a simple construction, comprising a plurality of antennas (11, 12); an antenna switching device (13) that selects any one of a plurality of antennas (11, 12) and carries out connection switching thereof; a demodulator (14) that demodulates a wireless signal and obtains a baseband spread spectrum signal; an A/D converter (15) that A/D converts the baseband spread spectrum signal and generates chip data; a digital matched filter (16) that finds the correlation value of the chip data and the spreading code; a maximum correlation value detection portion (18) that detects the maximum correlation value; an average value calculation portion (21) that finds the average value per frame of the maximum correlation value; and a level comparison device (22) that compares the above-mentioned average value and a predetermined threshold value, and outputs a control signal to the antenna switching device (13) to control antenn

Abstract: An apparatus and method for adjusting the clock delay in systems with multiple integrated circuits has a controller, a programmable clock generator and a plurality of integrated circuits, each integrated circuit including a data flip-flop, a programmable delay and a clock-fanout tree, wherein the clock delay in the integrated circuits is adjusted to match the inherent delay in the integrated circuit having the longest inherent delay.

Abstract: A clock generator system and method for providing and operating a codes with a clock signal at a desired operational rate are disclosed. The clock generator system also has a phase-locked loop circuit. The clock generator system determines whether an available clock signal within a circuit environment of the codec has a desired clock rate. If the available clock signal has the desired clock rate, the clock generator system supplies and operates the codec with the available clock signal. If the available clock signal does not have the desired clock rate, the phase-locked loop circuit generates from the available clock signal a desired clock signal having the desired clock rate and supplies and operates the codec with the desired clock signal.

Abstract: In a 1000 BASE-T transceiver, a timing error detector (TED, 5) receives its inputs directly from the output of an ADC (2) and from a decision device (4). Timing recovery is acquired in three stages: a non-decision directed (NDD) stage during which only the output of an ADC (2) are used for acquisition; a stage for acquiring the remote scrambler and predicting symbols; and a decision-directed (DD) stage during which locally predicted symbols are also used for acquisition. Because the timing error detector (TED, 5) does not take inputs from the FFE (3) there is no information about cable length, and so an input of gain from an AGC is used to indicate cable length.

Abstract: A receiver in a data read channel has an input terminal for receiving an input signal provided by a transmitter of the data read channel, and produces an output signal at an output terminal. The receiver includes a finite impulse response (FIR) filter coupled to the input terminal and having filter coefficients capable of being adapted, an interpolated timing-recovery circuit coupled to an output of the FIR filter, the timing-recovery circuit having an output signal coupled to the output terminal of the receiver, and a timer circuit coupled to the output terminal and feedback connected to the timing-recovery circuit, wherein the coefficients of the timing-recovery circuit are dynamically adapted using a cost weighted function through a signal power spectrum of the data read channel.

Abstract: A synchronization of a pilot assisted channel estimation orthogonal frequency division multiplexing can be achieved by receiving a signal containing pilot symbols, providing an initial time and frequency synchronization to the signal, phase rotating the signal across time, transforming the signal with a fast Fourier transformation, phase rotating the signal across frequency, extracting the pilot symbols and generating a channel estimator. The phase rotating across time and the phase rotating across frequency are controlled by a phase rotation controller in accordance with the channel estimator. The initial time and frequency synchronization synchronizes the signal such that intercarrier interference effects and intersymbol interference effects are negligible. The signal may include plural carrier frequencies each having an arrival timing offset and a frequency offset. The signal may also include delay spread or Doppler spread.

Abstract: A reference signal and a voltage controlled oscillator (VCO) output are compared for relative phase and frequency differences. A lead error signal is generated if the reference signal leads the VCO output and a lag error signal is generated if the reference signal lags the VCO output the lead and lag error may result from a combination for phase and frequency differences between the reference signal and the VCO output. A time window is used to sample the polarity of the lead and lag error signals by incrementing and decrementing a phase error signal. If the phase error signal reaches a threshold value within the time window, a Reset Delta pulse is generated and if the phase error signals does not reach the maximum delta value within the time window a Reset Total pulse is generated. A variable first gain signal is increased on each Reset Delta pulse and decreased on each Reset Total pulse and limited to a value between predetermined maximum and minimum values.

Abstract: A noise-resistive, burst-mode receiving apparatus including a voltage control signal generator for multiplying a frequency of a system clock signal and generating a voltage control signal having a level that corresponds to the multiplied frequency; a reset signal generator for delaying an irregular input signal in the unit of a packet, in response to the voltage control signal, performing an exclusive OR operation on the delayed and input signals, and outputting the result as a reset signal; a clock signal generator for generating a signal having a level that is changed at the middle point of each bit included in the packet as a recovered clock signal in response to the reset signal and the voltage control signal and outputting the recovered clock signal; and an output buffer for buffering the input signal and outputting the buffered signal as recovered data in response to the recovered clock signal.

Abstract: A solid state semiconductor neutron detector that automatically varies its sensitivity to provide a pulsed output over the entire range of operation of a nuclear reactor. The sensitivity is varied by changing the thickness or makeup of a converter layer that emits charged particles to the active region of the semiconductor surface.

Abstract: Nitrogen 14 is fed by pressure differentials in a continuous process within a microwave cavity in which the atoms are held in a fixed direction of spin while electromagnetic energy resonant with nitrogen 14 converts protons into neutrons thus transmuting nitrogen 14 into carbon 14.

Abstract: An integrated head assembly (100) is disclosed for a nuclear reactor. The preferred integrated head assembly includes a lift assembly (150) that supports the reactor vessel closure head (90) and integrated head assembly for removal, a separate support structure (202) supported by a ring beam (151) that sits atop the reactor vessel closure head, a shroud assembly (200), a seismic support system (300), a baffle assembly (500), a missile shield (400), and a CRDM cooling system. The CRDM cooling system draws cooling air into the baffle assembly, downwardly past the CRDMs (96), outwardly to upright air ducts (600), upwardly to an upper plenum (680), and out of the assembly through the air fans (190).

Abstract: An integrated head assembly (100) is disclosed for a nuclear reactor. The preferred integrated head assembly includes a lift assembly (150) that supports the reactor vessel closure head (90) and integrated head assembly for removal, a separate support structure (202) supported by a ring beam (151) that sets atop the reactor vessel closure head, a shroud assembly (200), a seismic support system (300), a baffle assembly (500), a missile shield (400), and a CRDM cooling system. The CRDM cooling system draws cooling air into the baffle assembly, downwardly past the CRDMs (96), outwardly to upright air ducts (600), upwardly to an upper plenum (680), and out of the assembly through the air fans (190). In a second embodiment the integrated head assembly (1100) includes a missile shield (1400) and CRDM cooling system (1600) that permits access to individual CRDMs from above.