Abstract: Disclosed are an analog channel measurement method and a base station, for use in implementing measurement of an analog channel in a digital-analog hybrid beamforming system. The method is such that: a base station receives a reference signal, where the base station comprises a digital-analog hybrid beamforming antenna system, and the digital-analog hybrid beamforming antenna system comprises digital channels and analog channels; the base station selects an analog channel group from an analog channel group set on the basis of the reference signal and employs the reference signal in measuring each analog channel of the selected analog channel group, where the number of analog channels that each analog channel group comprises is equal to the number of digital channels in the digital-analog hybrid beamforming antenna system.

Abstract: Methods, systems, and devices for wireless communication are described. A wireless device may use a subband of a frequency domain channel as a dedicated channel reservation (CR) sub-channel. Wireless devices may both monitor for and transmit CR signals in the CR subband. When not actively transmitting, a wireless device may monitor the CR subband to identify CR signals from other wireless devices. A wireless device communicating using the CR subband may transmit a CR signal and a pre-grant or pre-grant response simultaneously based on an frequency division multiplexing configuration. Multiple channels may share a CR subband. The CR subband may have a pre-configured frequency domain location or be at a configurable frequency in the channel. The data subband and CR subband may have different levels of synchronization, and base stations operating in the wireless communications system may consider data subband synchronization and CR subband synchronization separately.

Abstract: A method for transmitting signaling information includes: generating a link layer packet including signaling information; and transmitting the generated link layer packet. The link layer packet includes a fixed header and a payload. The signaling information includes information regarding a broadcast program and data and information needed for reception of the broadcast program and data, and the signaling information is contained in the payload of the link layer packet. The fixed header includes a packet type element for identifying a category of data contained in the payload of the link layer packet and a signaling type element for identifying a format of the signaling information contained in the payload of the link layer packet.

Abstract: A method for adaptively allocating resources of an uplink control channel according to a system situation is disclosed. If a base station (BS) recognizes the system situation, establishes control information for resource allocation, and transmits the control information to a mobile station (MS), the mobile station (MS) allocates resources for transmitting uplink control information using a specific block or a specific resource distribution method according to the corresponding control information. The system situation may be changed according to the number of users contained in the BS's coverage or the usage of a multi-antenna. The variation of the system situation is actively reflected so that the uplink channel resources can be effectively used.

Abstract: A method for video data transmission includes acquiring images based on an acquisition frame rate, performing frame dropping processing on the images to obtain target video image frames, encoding the target video image frames to obtain encoded target video image frames having an encoded output frame rate lower than the acquisition frame rate, and transmitting the encoded target video image frames to a display apparatus.

Abstract: Methods and systems are disclosed herein for performing channel estimation for multi-stream packets. The method may include receiving a data packet comprising a plurality of training fields, wherein the plurality of training fields comprises a training field, wherein the training field comprises a plurality of tones, and wherein the plurality of tones comprises a first tone and a second tone. The method may include modifying the first tone based on a predetermined signal associated with the first tone. The method may include storing the first tone in a data structure associated with the first tone. The method may include modifying the data structure based on the second tone.

Abstract: Aspects of the disclosure relate to ensuring information security in data transfers by utilizing decoy data. A computing platform may receive, from a data source computing device, a source data collection for a secure physical-storage-media data transfer and may identify one or more transmission parameters associated with the secure physical-storage-media data transfer. Subsequently, the computing platform may generate decoy data and may produce a secure dataset for the secure physical-storage-media data transfer by combining the decoy data with the source data collection received from the data source computing device. Then, the computing platform may encrypt the secure dataset based on the one or more transmission parameters to produce an encrypted dataset for the secure physical-storage-media data transfer.

Abstract: Methods and systems are described for generating a time-varying information signal at an output of a variable gain amplifier (VGA), sampling, using a sampler having a vertical decision threshold associated with a target signal amplitude, the time-varying information signal asynchronously to generate a sequence of decisions from varying sampling instants in sequential signaling intervals, the sequence of decisions comprising (i) positive decisions indicating the time-varying information signal is above the target signal amplitude and (ii) negative decisions indicating the time-varying information signal is below the target signal amplitude, accumulating a ratio of positive decisions to negative decisions, and generating a gain feedback control signal to adjust a gain setting of the VGA responsive to a mismatch of the accumulated ratio with respect to a target ratio.

Abstract: An operation method of a signal receiver includes sequentially receiving 0-th and first bits through one signal line, and adjusting a width of any one of a first high duration and a first low duration of a first signal corresponding to the first bit, based on values of the 0-th and first bits, when the values of the 0-th and first bits are identical to each other.

Abstract: A base station, e.g., for massive MIMO, has channel receivers, each connected to a respective antenna among a plurality of antennas to receive an RF transmission signal generated by a communication device (CD). Each channel receiver has a channel front-end module, which has a first bandwidth and converts the RF transmission signal into one or more first analog baseband signals. The channel receivers are collectively operable to define a spatial beam focus at the CD, based on channel state information of the CD. The base station has pilot signal receivers, each connected to a respective antenna among the plurality of antennas to receive an RF pilot signal generated by the CD or another CD. Each pilot signal receiver has a pilot signal front-end module, which has a second bandwidth that is smaller than the first bandwidth and converts the RF pilot signal into one or more second analog baseband signals.

Abstract: A communication apparatus has a receiver and a transmitter. The receiver, in operation receives a control signal including a Modulation and Coding Scheme (MCS) Index, a channel quality indicator (CQI) trigger and information indicating uplink resource blocks. The transmitter in operation, determines whether to multiplex an aperiodic CQI report with data in an uplink signal based on the MCS Index, the channel quality indicator trigger, the information indicating uplink resource blocks, and a threshold number of resource blocks, and transmits the uplink signal.

Abstract: An improved sliding discrete Fourier transform (SDFT) algorithm called CIC-SDFT and its apparatus are provided. An input signal is multiplied by a modulated twiddle factor, and is then processed by a modified cascade integrator-comb (CIC) filter. The CIC-SDFT comprises an integrator section and a comb section, with a downsampler disposed between the two sections to enable downsampling of the SDFT computations. Through addition of more integrator stages and comb stages to the CIC-SDFT, the accuracy of spectrum estimation may be improved in a computationally inexpensive manner and with less complexity than applying windowing functions to known SDFTs. Various embodiments provide a partially-nonrecursive method of CIC-SDFT that further decreases computational complexity.

Abstract: This information processing system inputs/outputs data normally, even when a serial communication bus is extended by network communication. The information processing system is provided with: a device; a device control unit for controlling the device; a device interface unit which interfaces with the device control unit; an information processing device provided with an application interface unit which interfaces with an application; a channel establishment unit which connects, via a communication unit, the application interface unit and the device interface unit, and establishes a control channel and a data channel between the application and the device; and an error suppression unit which suppresses the occurrence of error in data transfer over the channel established by the channel establishment unit.

Abstract: An apparatus includes an input node, an output node, and successive butterfly elements connected between the input node and the output node. Each butterfly element includes a first branch and a second branch that are cross-coupled with each other and that perform, collectively, sample add and sample delay operations. Either the first branch or the second branch of each butterfly element performs a sample inversion, such that a pattern of the sample inversions across the butterfly elements encodes into the butterfly elements a pattern of negative and positive binary values of a particular row of a Prometheus Orthonormal Sets (PONS) matrix. As a result, the successive butterfly elements correlate input samples applied to the input node against the particular row of the PONS matrix as the input samples are shifted through the successive butterfly elements.

Abstract: There is provided a decoder (310) for sequentially decoding a data signal received through a transmission channel in a communication system, the received data signal carrying transmitted symbols, the decoder comprising a symbol estimation unit (311) configured to determine estimated symbols representative of the transmitted symbols carried by the received signal from information stored in a stack, the stack being filled by iteratively expanding child nodes of a selected node of a decoding tree comprising a plurality of nodes, each node of the decoding tree corresponding to a candidate component of a symbol of the received data signal and each node being associated with a predetermined metric, the stack being filled at each iteration with at least some of the expanded child nodes and being ordered by increasing values of the metrics associated with the nodes, the selected node for each iteration corresponding to the node having the lowest metric in the stack.

Abstract: An enhanced sounding procedure provides both fine and coarse feedback from beamformees within the same sounding interval. This enhanced sounding procedure is enabled by several new fields in the sounding procedure field. The enhanced sounding procedures include multiple embodiments that can perform sounding between a beamformer and multiple high efficiency (HE) and/or very high throughput (VHT) beamformees each supporting coarse or fine sounding as the beamformer indicates.

Abstract: The cross-layer time synchronization method is a cross-layer synchronization approach that utilizes a timing recovery module at a physical layer (PHY), derives the information about the clock frequency offset from the timestamp-embedded message, and exploits it for synchronization at the higher layers. This approach either results in minimizing the cost of synchronization resulting in energy efficiency or improving the accuracy of the clock parameters' estimates by exploiting the PHY information. Some applications of this cross-layer technique include, but are not limited to, energy efficient wireless networks, cooperative networks or distributed MIMO networks.

Abstract: In described examples of a magnetically coupled structure on a substrate with an integrated circuit device, the structure includes a first coil in a differential configuration, a second coil located above the first coil in a generally stacked configuration, and a center tap connection to a winding of the second coil. The first coil includes a first differential terminal, a second differential terminal, and metal windings of the first coil. The first coil's metal windings form a continuous spiral electrical path between the first and second differential terminals. The first coil's metal windings include turns and crossing connections between the turns. The turns are fabricated in an integrated circuit metal wiring level, and the crossing connections are fabricated in at least one metal level other than the metal wiring level containing the turns. The center tap is positioned to create a balanced structure.

Abstract: The invention relates to a transmitting system, comprising an SNS client that receives SNS messages from at least one SNS server, and a transmitter which transmits a broadcast signal, including the SNS messages and mobile service data, for a mobile broadcast. The transmitter includes: an RS frame encoder, which performs RS encoding and CRC encoding on the mobile service data for the mobile broadcast so as to build RS frames, and divides each RS frame into a plurality of portions; a group-forming unit, which forms data groups that contain each of the plurality of portions, and which adds known data sequences and signaling data to each data group; an inter-leaver for interleaving data of the data groups; and a trellis encoding unit for trellis-encoding the interleaved data.

Abstract: The disclosure relates to an IQ mismatch correction module for a radio receiver, the IQ mismatch correction module comprising: an input terminal configured to receive an input signal; an output terminal configured to provide a filtered output signal; a mismatch detection module comprising: one or more bandpass filters configured to receive, from the input terminal or output terminal, a bandpass input signal and to pass a plurality of sub-bands of the bandpass input signal to provide respective bandpass filtered signals; one or more amplitude and phase mismatch detectors configured to determine amplitude and phase mismatch coefficients based on the bandpass filtered signals from the plurality of sub-bands; a transformation unit configured to apply a transformation to the amplitude and phase mismatch coefficients to provide correction filter coefficients for the plurality of sub-bands; and a filter module configured to: receive the filter coefficients for the plurality of sub-bands from the mismatch detection m

Abstract: When frequencies used in the two-frequency measurement of a SAW sensor are represented by f1 and f2 (f2>f1), an electrical signal processing device is provided without use of oversampling at a frequency higher than twice the frequency f2 or a two-system low-frequency conversion circuit, in which temperature compensation with the same accuracy as the case where these are used can be realized. Narrow band frequency filtering is applied to a waveform after roundtrips in a delay line type SAW sensor capable of transmitting and receiving multiple frequencies, the two frequencies f1 and f2 (f2>f1) are extracted, and a delay time is determined utilizing an aliasing obtained by applying undersampling at a frequency lower than twice the frequency f1.

Abstract: Certain aspects of the present disclosure relate to methods and apparatus for phase noise estimation in data symbols for millimeter wave (mmW). A method for wireless communications by a transmitting device is provided. The method generally includes identifying a phase noise metric associated with at least one receiving device; determining a phase noise pilot configuration based, at least in part, on the identified phase noise metric; and providing an indication of the phase noise pilot configuration to the at least one receiving device. A receiving device can receive the phase noise pilots in accordance with the configuration and determine phase noise for a data symbol based on the received phase noise pilots.

Abstract: Methods, apparatuses, computer readable media for uplink transmission power control in a wireless network. An apparatus of a wireless device comprising processing circuitry is disclosed. The processing circuitry is configured to decode a trigger frame from an access point for an uplink communication, the trigger frame comprising an uplink resource allocation for the station, the uplink resource allocation including common information and per station information, the common information including an indication of a maximum receive power at the access point, the per station information comprising an identification of the station, and an indication of a resource unit (RU). The processing circuitry may be further configured to: encode an uplink (UL) physical layer convergence procedure (PLCP) protocol data unit (PPDU)(UL-PPDU) in accordance with the indication of the RU. The processing circuitry may be further configured to: determine a transmit power for the UL-PPDU based on the maximum receive power.

Abstract: A method for performing self-interference cancellation (SIC) by an apparatus of a full duplex radio (FDR) mode in a wireless communication system including: performing a channel estimation of a received self-interference reference signal; calculating a power value of two order components of a non-linear self-interference signal based on the channel estimation; and establishing a non-linear digital self-interference cancellation order to be considered in the self-interference cancellation based on the power value of each for the two order components.

Abstract: Some embodiments include apparatus and methods using clock generation circuitry to generate a first clock signal and a second clock signal based on an input clock signal, the first and second clock signals having different phases, sampler circuitry to sample an input signal based on timing of the first and second clock signals and provide data information and error information associated with sampling of the input signal, a clock and data recovery unit to generate first control information based on the data information and the error information, and a phase error detection unit to generate second control information based on the data information and the error information, the clock generation circuitry to control timing of the input clock signal based on the first control information and to control timing of the first and second clock signals based on the second control information.

Abstract: A wireless terminal (1) is configured, when a plurality of hybrid automatic repeat request (HARQ) ACK/NACK bits corresponding to a plurality of downlink component carriers (DL CCs) configured in the wireless terminal (1) are transmitted on a single physical uplink control channel (PUCCH) on a single uplink component carrier (UL CC), to change a spreading rate to be applied to time-domain spreading of a plurality of modulation symbols generated from the plurality of HARQ ACK/NACK bits, depending on the number of the plurality of DL CCs or the number of the plurality of HARQ ACK/NACK bits.

Abstract: A system and method for removing bias from a frequency estimate. A simulation is used to predict, for various values of the signal to noise ratio, a bias in a raw frequency estimate produced by a frequency estimation algorithm. A straight line is fit to simulated frequency offset estimates as a function of true frequency offset, and the reciprocal of the slope of the line is stored, as a multiplicative bias removal term, in a lookup table, for the simulated signal to noise ratio. In operation, the raw frequency estimate is multiplied by a multiplicative bias removal term, obtained from the lookup table, to form a corrected frequency offset estimate.

Abstract: One embodiment is directed to a multiple input, multiple output (“MIMO”) telecommunications system comprising a plurality of signal paths. The system further comprises mixers located in the plurality of signal paths, the mixers being coupled to oscillators for producing a plurality of signals occupying non-overlapping frequency bands and representative of wireless signals. The system further comprises a summer coupled to the plurality of signal paths for summing the plurality of signals to form summed signals. The system further comprises a shared analog-to-digital converter for converting the summed signals to digital signals.

Abstract: A method in a receiver node (110, 115) is disclosed. The method comprises converting (604) a received time-domain signal (305, 405) to a frequency-domain signal, and obtaining (608), for the frequency-domain signal, an estimate of a frequency offset between a particular transmitter of one or more transmitters of interest and a receiver of the receiver node. The method comprises obtaining (612) a frequency compensated signal by applying a first frequency offset to compensate for the estimated frequency offset, and obtaining (616) a first channel estimation from the frequency compensated signal. The method comprises obtaining (620) a second channel estimation from the first channel estimation by applying a second frequency offset to the estimated channel, wherein the second frequency offset is the opposite of the first frequency offset.

Abstract: Techniques are described for wireless communication. A method for wireless communication at a base station includes determining a set of physical downlink control channels (PDCCHs) to be transmitted in a control region; transmitting an enhanced physical control format indicator channel (ePCFICH) identifying a quantity of PDCCHs in the set of PDCCHs associated with each aggregation level of at least one aggregation level, and a size of the control region; and transmitting the set of PDCCHs in the control region on a component carrier deployed in a radio frequency spectrum band. A method for wireless communication at a user equipment (UE) device includes receiving the ePCFICH; receiving the control region; and searching for at least one PDCCH within the control region based at least in part on receiving the ePCFICH.

Abstract: Embodiments herein relate to methods and apparatuses. A method performed by a network node (210) for sending to a wireless device (250) a first synchronization signal and an associated information message, for synchronization of the wireless device (250) with the network node (210) is provided. The network node (210) sends the first synchronization signal in OFDM symbols within a subframe, at least once in a time and frequency position in every one of the N OFDM symbols. For each sending of the first synchronization signal, the network node (210) sends an associated information message at a pre-defined time and frequency position in an OFDM symbol. The pre-defined time and frequency position is relative to the time and frequency position of the first synchronization signal. Embodiments herein also relate to a wireless device and method therein.

Abstract: An improved receiver design implements a practical method for modeling users in SIC turbo loop multiuser detection architectures, wherein in each loop unsubtracted estimation errors from previous loops are used to appropriately scale the error covariance matrix for each user, thereby accurately representing the remaining residual interference in the data stream for each desired user. The effect of estimation errors in previous interference cancellation operations is thereby minimized, and symbol estimations in successive turbo loops are improved, for example during multiuser MMSE, multiuser MMSE with interference rejection combining (MMSE-IRC), sample matrix inversion (SMI), or any of their adaptive variants (least mean-square, recursive least square, Kalman filter etc.). The estimated residual symbol energy can be computed per symbol, and then applied to entire data streams, to groups of symbols, or to each symbol separately.

Abstract: A method using multiple receivers of a wireless communication device to accelerate cell selection and reselection is disclosed. Multiple receivers of the wireless device are used to implement carrier aggregation in LTE connected mode. The multiple receivers of the wireless device are used to search for cells concurrently across multiple radio frequency bands and/or multiple radio access technologies during cell selection and/or cell reselection procedures. A first receiver and a second receiver of the wireless device each search for cells over different radio frequency bands simultaneously, and accordingly the cell selection and reselection time is effectively reduced compared to using only one receiver. Multiple receivers are also used concurrently, in parallel, to accelerate inter-frequency cell detection and measurement and for inter-RAT searches and measurements.

Abstract: A method of circuit yield analysis for evaluating rare failure events existing in multiple disjoint failure regions defined by a multi-dimensional parametric space, the method including performing initial sampling to detect failed samples respectively located at multiple failure regions in the multi-dimensional parametric space, performing clustering to identify the failure regions, performing feature filtering to determine which parameter component is a non-principal component in affecting circuit yield, applying a dimensional reduction method on a dimension corresponding to the parameter component, optimizing an importance sampling (IS) distribution function corresponding to each of the failure regions, and constructing a final importance sampling (IS) distribution function using a mixed Gaussian (mGaussian) function corresponding to all of the failure regions.

Abstract: Disclosed is a method of compensating for coupling impairments in optical communication systems comprising two or more coupled transmission lines. The method comprises introducing into the system a component comprising an electronic circuit configured to realize at least one of an exact electrical coupling compensation (EECC) algorithm and a spectrally fragmented electrical coupling compensation (SF-ECC) algorithm.

Abstract: Provided are a method and an apparatus for a user equipment, which is allocated a plurality of serving cells, receiving acknowledgement/negative acknowledgement (ACK/NACK) in a wireless communication system. The method comprises: transmitting uplink data through a physical uplink shared channel (PUSCH); and receiving ACK/NACK with respect to the uplink through a physical hybrid-ARQ indicator channel (PHICH), wherein a serving cell that receives the ACK/NACK is selected from one or more serving cells, which the user equipment monitors to detect an uplink grant that schedules the PUSCH.

Abstract: A gain controller sets a gain code indicating an optimum gain, a cutoff frequency code indicating a cutoff frequency, and a number of bits code indicating a number of bits. An AEQ/VGA gain controller sets a frequency characteristic code indicating a frequency characteristic, a gain code indicating a gain after correction, and a number of bits code indicating a number of bits. An AEQ/VGA amplifies a baseband received signal on the basis of a gain code and corrects a frequency characteristic of the baseband received signal on the basis of a frequency characteristic code. An HPF cuts off a band below a cutoff frequency of an output signal from the AEQ/VGA on the basis of a cutoff frequency code. An ADC quantizes an output signal from the HPF using a number of bits based on a number of bits code and generates a digital received signal.

Abstract: A low power method of wirelessly transmitting sensor data between devices is disclosed in which a data connection is not required to be established between the devices in order to transfer the sensor data. The method comprises providing a first device (550) having sensor data therein received from at least one sensor. The first device (550) is operated in an advertising state so as to periodically and wirelessly broadcast data packets, wherein each data packet includes an identifier for identifying the first device and also includes said data from the at least one sensor (561, 562). A second device (552) is operated in a scanning state in which the second device (552) scans for data packets broadcast by other devices.

Abstract: A method for network tapping and packet brokering in wireless networks includes tapping a signal in a wireless network and determining whether the signal is a valid signal according to a wireless network protocol. In response to determining that the signal is a valid signal according to the wireless network protocol, the signal is demodulated into a sequence of bits arranged according to the wireless network protocol. In response to determining that the signal is not a valid signal according to the wireless network protocol, an indication that the signal is not a valid signal according to the wireless network protocol is generated. A packet in a format compatible with a network tapping and packet brokering system is generated. At least some of the bits or the indication is inserted in the packet. The packet is transmitted to the network tapping and packet brokering system.

Abstract: To provide a DC-DC converter capable of reducing noise and a wireless communication device including the same, the DC-DC converter according to an embodiment includes a pulse signal generation unit generating a pulse signal, a voltage conversion unit that has a switch portion provided between an input terminal and an output terminal and on/off controlled by the pulse signal, and outputs an output voltage obtained by stepping down an input voltage supplied to the input terminal, from the output terminal, and a control circuit that controls a value of a current flowing through the switch portion in an on-state based on a value of the input voltage.

Abstract: A channel estimation apparatus and method are provided to ensure that a channel estimation value can correctly reflect a transmission channel status, so that an orthogonal frequency division multiplexing (OFDM)-based wireless system can correctly transmit an aggregate long frame according to the channel estimation value. The channel estimation apparatus determines a first channel estimation value, receives a first symbol group of a long frame according to the first channel estimation value, and determines a second channel estimation value according to the first symbol group, and if a difference between the first channel estimation value and the second channel estimation value is less than or equal to a first threshold, determines a third channel estimation value according to the first channel estimation value and the second channel estimation value.

Abstract: Methods are disclosed which can be performed by a network node for sending to a wireless device a first synchronization signal and an associated information message, for synchronization of the wireless device with the network node. The network node and the wireless device operate in a wireless communications network. The network node sends the first synchronization signal in N OFDM symbols within a subframe, at least once in a time and frequency position in every one of the N OFDM symbols. N is equal or larger than 2. For each sending of the first synchronization signal, the network node sends an associated information message at a pre-defined time and frequency position in an OFDM symbol. The pre-defined time and frequency position is relative to the time and frequency position of the first synchronization signal. The associated information message is associated with the first synchronization signal.

Abstract: An ultra-low-power receiver includes a low-noise amplifier configured to receive an input analog signal and generate an amplified signal and a mixer electrically coupled to the low-noise amplifier. The mixer is configured to convert said amplified signal into an intermediate frequency signal. A progressively reduced intermediate frequency filter is configured to process the intermediate frequency signal from the mixer in discrete time.

Abstract: A radio frequency signal can be received in an intermediate frequency mode suitable for radio wave reception conditions. An oscillator has a variable oscillation frequency. A quadrature demodulator includes a frequency mixer and generates an intermediate frequency signal having an intermediate frequency lower than the frequency of the radio frequency signal. An ADC receives the intermediate frequency signal passed through an analog filter and converts the received intermediate frequency signal to a digital signal. A channel selection signal processing section generates a demodulated signal from the intermediate frequency signal converted to the digital signal. A mode control section switches the operating mode of the quadrature demodulator between a zero intermediate frequency mode and a low intermediate frequency mode in accordance with the radio wave reception conditions.

Abstract: Aspects of the present invention provide additional MAC functionality to support the PHY features of a wireless communication system framework. The additional MAC functionality aids in enabling feedback from wireless terminals to base stations. In some aspects of the invention the feedback is provided on an allocated feedback channel. In other aspects of the invention the feedback is provided by MAC protocol data units (PDU) in a header, mini-header, or subheader. The feedback may be transmitted from the wireless terminal to the base station autonomously by the wireless terminal or in response to an indication from the base station that feedback is requested. Aspects of the invention also provide for allocating feedback resources to form a dedicated feedback channel. One or more of these enhancements is included in a given implementation. Base stations and wireless terminals are also described upon which methods described herein can be implemented.

Abstract: An integrated analog to digital converting and digital to analog converting (ADDA) RF transceiver for satellite applications, configured to replace conventional analog RF down and up conversion circuitry. The ADDA RF transceiver includes one of more ADCs, DSPs, and DACs, all on a single ASIC. Further, the circuitry is to be radiation tolerant for high availability and reliability in the ionizing radiation environment present in the space environment.

Abstract: An improved receiver design implements a practical method for modeling users in SIC turbo loop multiuser detection architectures, wherein in each loop unsubtracted estimation errors from previous loops are used to appropriately scale the error covariance matrix for each user, thereby accurately representing the remaining residual interference in the data stream for each desired user. The effect of estimation errors in previous interference cancellation operations is thereby minimized, and symbol estimations in successive turbo loops are improved, for example during multiuser MMSE, multiuser MMSE with interference rejection combining (MMSE-IRC), sample matrix inversion (SMI), or any of their adaptive variants (least mean-square, recursive least square, Kalman filter etc.). The estimated residual symbol energy can be computed per symbol, and then applied to entire data streams, to groups of symbols, or to each symbol separately.

Abstract: The present invention relates to a method and a device for transmitting a training symbol for hybrid beamforming. A method for transmitting a training symbol for estimating an analog beam in a wireless access system which supports hybrid beamforming according to one embodiment of the present invention comprises: a step of repeatedly transmitting a training symbol a number of times equivalent to the number of analog candidate beams; and a step of repeatedly transmitting a broadcasting channel a number of times equivalent to the number of analog candidate beams. A training symbol section, where the training symbol is transmitted, can be allocated to the same subframe as a subframe to which the repeatedly transmitted broadcasting channel is allocated.

Abstract: Signal extrication of a pair of quadrature amplitude modulated signals of a particular carrier frequency and phase constant by equally splitting all input signals into two independent circuit paths that contain identical components but one independent circuit path performs a complementary signal processing function with respect to the other resulting in a counterbalance between the two paths, canceling all output signals with the exception of said pair of quadrature amplitude modulated signals which are not canceled because of the singular signal nullification property of a product detector circuit that is a component in each of said independent circuit paths.

Abstract: A digital television (DTV) transmitting system is provided that includes an encoder, a group formatter, a packet formatter and a transmission unit. The group formatter forms data groups where the plurality of second known data sequences are spaced 16 segments apart within at least one of the data groups that includes a transmission parameter inserted between the first known data sequence and the plurality of second known data sequences and the first known data sequence has a first M-symbol sequence and a second M-symbol sequence, the first M-symbol sequence and the second M-symbol sequence have a first pattern, each of the plurality of second known data sequences has a second pattern other than the first pattern, and the second pattern is positioned from a last symbol to a previous N symbol in each of the plurality of second known data sequences.