Abstract: A method of transmitting a control signal using efficient multiplexing is disclosed. The present invention includes the steps of multiplexing a plurality of 1-bit control signals within a prescribed time-frequency domain by code division multiple access (CDMA) and transmitting the multiplexed control signals, wherein a plurality of the 1-bit control signals include a plurality of the 1-bit control signals for a specific transmitting side. Accordingly, reliability on 1-bit control signal transmission can be enhanced.

Abstract: Systems and methods for performing UE handover based on group delay variation include a base station (i) selecting a target neighbor sector from a plurality of neighbor sectors for the handover, where each neighbor sector has a group delay metric, and where the target neighbor sector is selected from the neighbor sectors based at least in part on each neighbor sector's group delay variation and (ii) initiating handover of the UE to the target neighbor sector. Some embodiments include creating a neighbor relations table (NRT) comprising at least some of the neighbor sectors, and prioritizing the NRT based on group delay and/or group delay variation. In some embodiments, selection of the target neighbor sector for the handover is additionally based on neighbor sector handover success rates and Reference Signal Receive Power (RSRP) values for neighbor sectors reported by the UE for which the handover is to be performed.

Abstract: Provided are a receiver, a transmitter and a radio communication method capable of using non-orthogonal multiple access while suppressing cost increase and processing delay. A mobile station 200A includes a physical channel segmentation unit 210 and data demodulating/decoding units 220. A radio resource block allocated to non-orthogonal signals is defined in a frequency domain, a time domain and a non-orthogonal multiplex domain. The non-orthogonal multiplex domain has multiple levels corresponding to the number of interference cancellations by the data demodulating/decoding units 220. Interference canceller of the mobile station 200A cancels a non-orthogonal signal whose allocated radio resource block is at a lower level than that of the mobile station 200A.

Abstract: A method and apparatus for transmitting and receiving a preamble having sequence information for an OFDM system is provided. The preamble transmission method includes generating a preamble block including at least one frame having a header with a known sequence and a code block containing control information and transmitting the preamble block mapped to Orthogonal Frequency Division Multiplexing (OFDM) cells by repeating in frequency axis direction.

Abstract: A service network for access procedure enhancement includes a radio access network performing wireless transmissions and receptions to and from a mobile communication device. The service network also includes a control node receiving an access probe from the mobile communication device via the radio access network, determining whether the access probe indicates that a length of message data is less than a threshold, and transmitting a pre-acknowledgement of the access probe to the mobile communication device via the radio access network in response to the length of the message data being less than the threshold.

Abstract: A system and method obtain a set of data and identify successive subsets of data within the set of data. A boundary identifying hash is calculated on a subset of data and compared with a boundary indicating value. If the calculated boundary identifying hash matches the boundary indicating value, a natural boundary is identified in the set of data.

Abstract: A serial communication link including first and second components. The first component includes a first management module and a first encoder that provides A-bit/B-bit encoded data to a first channel, where A<B. The second component includes a second management module and a first decoder/bit-error-rate (BER) module that receives the A-bit/B-bit encoded data from the first channel, determines a BER associated with the A-bit/B-bit encoded data, and provides an indication to the second management module when the BER is higher than a threshold BER level. The second management module communicates the indication to the first management module, and the first management module directs the first encoder to provide C-bit/D-bit encoded data to the first channel in response to receiving the indication, where C<D, C<A, and D<B.

Abstract: Virtual sensor technology, in which a camera is controlled to capture at least one configuration image of an area monitored by a monitoring system and input is received that defines one or more characteristics of the at least one configuration image that enable sensing of an event in the area. Based on the received input, configuration data used in sensing the event is generated and stored. After storage of the configuration data, the camera is controlled to capture one or more images of the area, the one or more images are analyzed based on the configuration data, and occurrence of the event is detected based on the analysis of the one or more images. Based on detecting occurrence of the event, a transmitting device is controlled to send, to a controller of the monitoring system, a signal that indicates the detection of the occurrence of the event.

Abstract: Systems, methods, and computer-readable media are described herein for allowing a user or a service provider to selectively prioritize voice communications over data communications. By selectively prioritizing voice communications over data communications, the number of dropped calls in the mobile telecommunications network can be significantly reduced.

Abstract: The present invention provides processes of creating, updating, and releasing SYNC entities between eNB and BM-SC, and an eNB and a BM-SC for implementing the processes of creating, updating, and releasing the SYNC entities. According to a solution of the present invention, a method of creating SYNC entities is provided, including: creating, at a BM-SC, a plurality of SYNC entities whose amount is equal to the total amount of services, and associating the created plurality of SYNC entities with the services in a one-to-one correspondence manner; sending a SYNC entity creating instruction to all eNBs within an MBSFN area; creating, at each eNB, a plurality of SYNC entities whose amount is equal to the total amount of services based on the received SYNC entity creating instruction, and associating the created plurality of SYNC entities with the services in a one-to-one correspondence manner.

Abstract: Methods, systems, and apparatus can provide channel scanning. In various examples, a channel scanning module can instruct scanning of multiple channels within a wideband frequency range by assigning channels to demodulators to attempt to lock onto a signal at the assigned channel. In other examples, a channel scanning module can instruct scanning for downstream channels by assigning channels to multiple narrowband tuners and multiple demodulators to attempt to lock onto a signal on the assigned channel.

Abstract: A method for responding to a page message is provided. The method can include a wireless communication device receiving a page message on a first channel of a first network; suspending a connection to a second network in response to receiving the page message; transitioning to a second channel of the first network prior to responding to the page message; and sending a response message responsive to the page message on the second channel.

Abstract: A device is configured to obtain interference information indicating interference levels at frequencies. The device is configured to determine a frequency for a small cell to use to communicate with a client device based on the interference information. The small cell is capable of using the frequencies to communicate and the frequency is determined from among the frequencies. The device is further configured to provide frequency information to the small cell instructing the small cell to communicate with the client device using the frequency.

Abstract: Methods and apparatuses are provided for transmitting a signal using a sequence in a wireless communication system. A first sequence used to transmit a first signal in a first channel is determined by performing group-hopping using a pseudo-random pattern over a first group of sequences. A second sequence used to transmit a second signal in a second channel is determined by performing the group-hopping using the pseudo-random pattern over a second group of sequences.

Abstract: A system and method for analyzing and validating oil and gas well production data is disclosed. The system includes a network, a server connected to the network, and a set of wells connected to the network. In a preferred embodiment, the server is programmed to store and execute the method. The method includes the steps of collecting a set of data from the set of wells, performing an first RPI® evaluation on the set of data, creating a matched data set from the set of data, segregating the matched data set into a set of comparison groups, normalizing each comparison group of the set of comparison groups, calculating a set of performance metrics between a subset of the set of comparison groups, and calculating a probability for each performance metric of the set of performance metrics.

Abstract: A method performed at a base station and a corresponding method performed at a station receiving a transmission from the base station. The methods relate to signaling the station as to a number of PDCCH information that is included in the transmission so the station may terminate a search when the station has identified the PDCCHs in the transmission. The method performed by the station includes receiving the transmission that includes at least one PDCCH information, each PDCCH information having a respective mapped downlink control information (DCI). The method further includes detecting one of the PDCCH information in the transmission and determining lengths of information bits of the DCI and the PDCCH information. The method also includes terminating a search for a further one of the PDCCH information when a first type of padding is used for the mapping of the DCI over the PDCCH information based on the lengths.

Abstract: A method of satellite status judgment and computer program includes steps of selecting a plurality of observation satellites from a plurality of satellites according to a first condition, selecting, by the positioning apparatus, each of the observation satellites in turn as a target satellite, obtaining a signal variation slope of a first signal of a target satellite during a first observation time period, determining whether the target satellite should be masked according to the slope of the first signal, generating a prompt message when it is determined that the target satellite should be masked, and masking positioning signals transmitted from the target satellite according to the prompt message.

Abstract: A digital broadcasting system is provided. The system includes an RS (Reed-Solomon) encoder configured to encode mobile service data for FEC (Forward Error Correction) to build RS frames including the mobile service data and a signaling information table, a signaling encoder configured to encode signaling information including fast information channel (FIC) data and transmission parameter channel (TPC) data, a group formatter configured to form data groups, wherein at least one of the data groups includes encoded mobile service data, known data sequences, the FIC data and the TPC data, and a transmission unit configured to transmit the broadcast signal including a parade of the data groups.

Abstract: Method of detecting a jamming transmitter, affecting a communication user equipment, wherein said communication user equipment is adapted for communication with a component of a cellular code division multiple access based radio network having a number of user equipments and a number of base node stations, providing the user equipment in a connected mode of a communication radiolink with the component of the radio network wherein in the connected mode of said user equipment jamming detection steps are provided.

Abstract: Embodiments of the present application provide an uplink interference management method, node, and system, which relate to the field of wireless communications and can reduce interference caused by a macro cell UE to an adjacent micro cell, thereby improving an uplink capacity of the micro cell. The method of the present application includes: receiving, by a micro cell node, an interference cancellation request sent by a macro cell node, where the interference cancellation request includes uplink configuration information of a user equipment (UE), uplink scrambling code information of the UE, and location information for determining an uplink dedicated physical control channel (DPCCH) of the UE; and cancelling interference according to the interference cancellation request. The embodiments of the present application are mainly used in a process of cancelling the interference caused by the macro cell UE to the micro cell.

Abstract: A method performed at a network component for indicating a number of grants in a transmission and a corresponding method performed at a station to limit a search for the grants to the number indicated in the transmission. In one embodiment, the transmission includes physical downlink control channel (PDCCH) information and modified cyclic redundancy check (CRC) information, the modified CRC information being generated from CRC information for the PDCCH information and a modifier representing a number of grants. The station determines the number of grants from the modified CRC information, performs a search for a first grant within the PDCCH information and terminates the search upon identifying the first grant, when the number of grants is the first number.

Abstract: A method and apparatus are provided for transmitting symbols in wireless communication system. A method includes determining a channel quality indicator (CQI) and one or more acknowledgements; generating a first symbol based on the CQI; generating a second symbol based on the one or more acknowledgements; and transmitting the first symbol and the second symbol in a slot. One of a first code and a second code is applied for generating the second symbol, if the one or more acknowledgements is one bit. One of the first code, the second code, a third code, and a fourth code is applied for generating the second symbol, if the one or more acknowledgements are two bits.

Abstract: Methods and apparatus are provided for transmitting and receiving a data stream in a digital video broadcast system. The data stream is segmented into a plurality of segments of the data stream. A frame is generated. The frame includes a preamble section and a data section. The data section carries the data stream, and the preamble section carries signalling information. The frame is transmitted to a receiver. In generating the frame, the data section of the frame is segmented into a plurality of frequency zones, and at least one segment of the data stream is mapped to a frequency zone of the plurality of frequency zones. The signalling information includes first segmentation information of the data stream and second segmentation information of the plurality of frequency zones.

Abstract: Various embodiments provide methods implemented in a mobile communication device (e.g., a multi-RAT communication device) for maintaining at least one separate RGS value for each of a plurality of RATs operating on the mobile communication device. Specifically, a device processor on the mobile communication device (e.g., a crystal oscillator manager) may maintain a separate, up-to-date RGS value for each of the plurality of RATs and may associate each of the plurality of RATs with their respective RGS values. By keeping track of the plurality of RATs' respective RGS values, the device processor may ensure that an appropriate RGS value is used to facilitate each RAT's individual operations, such as acquisition/re-acquisition operations, sleep scheduling calculations, and handover/inter-RAT measurement operations. As a result, various embodiments may improve the performance of each RAT and the overall performance of the mobile communication device.

Abstract: A method of adding a user account to an unassociated device may include detecting, by an associated device that is associated with a user account, an audio signal broadcast by an unassociated device that is not associated with the user account, where the audio signal includes a token. The method may include sending the token to a computing device associated with a service provider of the user account, receiving, by the associated device, a command, determining that the received command is an authorization command, and in response to determining that the received command is an authorization command, sending one or more authorization instructions to the computing device. The one or more authorization instructions may instruct the computing device to send one or more credentials associated with the user.

Abstract: Various examples provide a method and a system for spectrum handover in cognitive radio (CR) systems. According to the method, after detecting a user of an authorized system appears at a current working frequency, the base station generates a spectrum handover command and sends the spectrum handover command via a channel identified by the CR DWNDI to instruct the UEs in the cell to perform spectrum handover according to the spectrum handover command.

Abstract: An integrated circuit can include a group of bond pads alternating between bond pads configured to provide a return path and bond pads configured to provide a signal bond pad. For example, five bond pads can be arranged in a return-signal-return-signal-return arrangement. The integrated circuit can further be configured to receive or transmit high frequency signals.

Abstract: Systems, methods, and computer-readable media are described herein for allowing a user or a service provider to selectively prioritize voice communications over data communications. By selectively prioritizing voice communications over data communications, the number of dropped calls in the mobile telecommunications network can be significantly reduced.

Abstract: Various systems and methods are provided that retrieve data measured by various sensors associated with a sensor collection site and compress the retrieved data so that the compressed data can be transported to and stored in one or more databases in an efficient manner. The various systems and methods may further retrieve the data stored in the one or more databases and generate an interactive user interface to display the data. While each instance of measured data may include a plurality of parameters, the various systems and methods may flatten the measured data such that information pertaining to each parameter can be displayed in a two-dimensional graph. Features may be extracted from the stored data to identify events that have occurred or that may occur in the future during operation of the sensor collection site such that a user can take appropriate action.

Abstract: A method for exchanging messages via a bus in accordance with CAN standard ISO 11898-1, the logical structure including a start-of-frame bit, an arbitration field, a control field, a data field, a CRC field, an acknowledge field, and an end-of-frame sequence, and the control field including a data length code, the data field of the messages can include more than eight bytes, the values of the data length code being interpreted to determine the size of the data field. For the forwarding of data between the data field and the application software, at least one buffer memory is provided, and, if the size of the data field differs from the size of the buffer memory used, the forwarded quantity of data is adapted at least corresponding to the difference in size between the data field and the buffer memory used.

Abstract: Technology for blind phase-shift keying (PSK) and quadrature amplitude modulation (QAM) identification of a received radio frequency (RF) signal is disclosed. One method can include: uniform sub-sampling the received RF signal to eliminate a phase contribution from a carrier frequency of the received RF signal; and computing a likelihood function of observed phase differences of the sub-sampled received RF signal of a phase sequence for each PSK modulation type. Another method can include: non-uniformly sub-sampling the received RF signal for a distribution of signal amplitudes of the received RF signal; and computing a likelihood function of the signal amplitudes of the sub-samples of the received RF signal for each modulation type.

Abstract: Methods and apparatus of wireless communication at a user equipment comprise compressing an uplink data packet. The methods and apparatus further comprise transmitting the uplink data packet on an uplink dedicated transport channel (DCH) to a network entity a plurality of times within a time duration allowed for transmission of the uncompressed uplink data packet. Moreover, the methods and apparatus comprise receiving a downlink acknowledgement message from the network entity corresponding to the uplink data packet. Additionally, the methods and apparatus comprise terminating transmission of the uplink DCH by transmitting bits of zero power for a remainder of the time duration on the DCH based on receiving the downlink acknowledgement message.

Abstract: A system and method for aggregation of a plurality of wireless communication signals in a common radio frequency transmitter. A multiple subchannel multiplexed (MSM) signal within a frequency band, and having a communication protocol with pilot signals estimating a channel state and efficient signal demodulation with a mobile receiver is combined with another signal. An automated digital processor at the transmitter modifies the MSM to meet at least one fitness criterion of the combined signal, selected from among alternatives that will maintain good reception of all transmitted signals within system protocols, without requiring transmitting additional side information specifying the modification. The range of alternates include modifications that disrupt the pilot signals.

Abstract: Apparatus and methods for wireless communication transmission power control are provided. Determination of gain factors and adjustments for physical channel reconfiguration in the context of transmission power control are addressed. Preferably, implementation is in conjunction with communication systems in which wireless communications are conducted between wireless transmit receive units (WTRUs) using multiple channels that are concurrently transmitted.

Abstract: A system for and method of establishing a secure communication link is disclosed. The method comprises: (1) generating a Domain Name Service (DNS) request; (2) determining that the DNS request corresponds a first computer configured to communicate securely; (3) sending, based on the determination, a request to establish a secure communication link with the first computer configured to communicate securely, the request including an identifier of a client device used to determine whether the client device is authorized to communicate with the first computer; (4) receiving, in response to the request to establish a secure communication link, a resource used to establish the secure communication link; (5) automatically establishing the secure communication link using the received resource; and (6) communicating securely with the first computer over the established secure communication link.

Abstract: The present disclosure provides a method for making mobility measurements in a cellular telephone network that includes assessing the quality of the downlink signal from an active cell during multiple discontinuous operation time periods. If the quality metric exceeds a threshold, the method calls for performing a mobility measurement on the downlink signal during a first time interval. If the quality metric is less than the threshold, the method calls for performing the mobility measurement on both the downlink signal from the identified cells and a downlink signal from a previously un-identified cell during a second time interval that is greater than the first time interval.

Abstract: The present invention provides a method for scheduling a SDMA user group in an MU MIMO system and a base station. The method comprise the following steps: calculating, according to channel state information, a projection matrix of a channel matrix of each user in a user group on a joint channel matrix of other users in the same user group, where the user group is selected from a plurality of users; calculating a capacity metric of the user group according to the projection matrixes; and selecting an optimal user group according to the metrics of a plurality of user groups. The present invention effectively eliminates the MUI on terminal users at the transmitter side, and reduces the computational complexity.

Abstract: A satellite communication system including a multibeam satellite for generating a plurality of feeder beams and a plurality of user beams over a region of interest, a plurality of spatially-separated gateway stations for providing feeder links to said multibeam satellite via respective feeder beams; and a control for operating said gateway stations and multibeam satellite such that: in nominal conditions, NGW gateway stations exchange data with K user beams, each of the gateway stations allocating a fraction of its bandwidth to each of the user beams; and in case of fading, data are switched from faded to unfaded gateway stations, whereby none of said user terminals experiences service outage. A method of performing satellite communication using the satellite communication system, and a multibeam communication satellite payload for carrying out the method are provided.

Abstract: The present disclosure provides a method and an apparatus for determining transmission power for a base station. The method may comprise receiving information on link resource configuration of at least one interfered base station; determining the transmission power for the base station, based on link resource configuration for the base station and the information on link resource configuration of the at least one interfered base station. With embodiments of the present invention, it is possible to provide a new power control scheme by which the cross-subframe co-channel interference might be mitigated and thus the uplink performance of a user equipment, and besides, the downlink performance of the edge UE might also be improved. Additionally, the present disclosure also provides a method and apparatus for providing information for power determination.

Abstract: A receiver for an MCM signal with pilot symbols, comprising a first phase adjustment unit for adjusting the phase of an MCM signal by means of the pilot symbols and to output a first phase adjusted MCM signal to an MCM re-modulator unit which demodulates and then modulates the first phase-adjusted MCM signal to create an MCM reference signal. The communications receiver also comprises a second phase adjustment unit which receives the first phase adjusted MCM signal and also the MCM reference signal. The second phase adjustment unit adjusts the phase of the first phase adjusted MCM signal by means of said MCM reference signal and outputs a second phase adjusted MCM signal to an output MCM demodulator which demodulates the second phase adjusted MCM signal and outputs the demodulated MCM signal.

Abstract: A communication device, such as a smart phone, includes transmit/receive logic to cancel an interfering signal component. The interfering signal component may originate from a communication interface on the device itself. For example, transmissions from the communication interface may interfere with received signals at other communication interfaces on the device. Transmit/receive logic on others of the communication interfaces may use known characteristics of the interfering signal component to cancel the interfering signal component.

Abstract: A method is described for adapting the size of data for a future Transmission Time Interval (TTI) by a User Equipment (UE), wherein all the Media Access Control (MAC)-d flows are grouped and stored in different lists based on a type of grants associated with the MAC-d flows, ability of a MAC-d flow to be multiplexed with another MAC-d flow from a list, and data availability in a logical channel mapped onto a MAC-d flow in the current TTI. The E-TFC is then selected by the UE for the future TTI using the MAC-d flow having the highest power offset in a consolidated list including the grouped MAC-d flows. The size of the data is thereby adapted using the selected E-TFC. Further disclosed is a method for generating RLC PDUs by the UE for the future TTI using the variation in the scheduled grant for the UE and the size of the data adapted for the future TTI.

Abstract: The present invention relates to a method for operating a network comprising a first primary station and a second primary station, wherein the first primary station serves a first cell including at least one first secondary station communicating with the first primary station and wherein the second primary station serves a second cell including at least one second secondary station communicating with the second primary station, the method comprising the steps of (a) the first primary station and the second primary station transmitting payloads in a synchronous manner on at least one set of resources, (b) the first and the second primary stations transmitting control data on the at least one set of resources respectively to the first secondary station and to the second secondary station, wherein the method further comprises (c) at least the first primary station rendering the transmission of control data to the first secondary station orthogonal to the transmission of control data from the second primary stati

Abstract: A communication device 1 (transceivers 400) transmits a training signal from its own transmitting antenna while performing beam scanning, and a communication device 2 (transceivers 500) receives this training signal in a state where a quasi-omni pattern is generated in its own receiving antenna. Further, the device 1 transmits a training signal in a state where a quasi-omni pattern is generated in the transmitting antenna, and the device 2 receives this training signal by the receiving antenna while performing beam scanning. The device 1 and 2 detects, from respective reception results, transmitting-antenna-setting candidates of the device 1 and receiving-antenna-setting candidates of the device 2, and determines antenna-setting pairs (combinations of antenna-setting candidates). The above-described processes are also performed for a receiving antenna of the device 1 and a transmitting antenna of the device 2. The device 1 and 2 communicates by using the obtained antenna-setting pairs.

Abstract: According to a first aspect, it is presented a method for decoding at least one signal from a sequence of symbols. The method is executed in a network node of a mobile communication system and comprises the steps of: receiving a sequence of symbols using a radio receiver; identifying at least one corrupted symbol by identifying a corruption of at least the first received symbol of the plurality of symbols; obtaining a working set of symbols, by omitting the at least one corrupted symbol from the sequence of symbols; and de-spreading the working set of symbols using a subset of a first de-spreading code, wherein the subset of the first de-spreading code comprises code elements corresponding to the working set of symbols, to thereby provide a first decoded signal. A corresponding network node, computer program and computer program product are also presented.

Abstract: A mobile station apparatus receives a radio resource control signal including at least a first parameter POFFSET (0) and a second parameter POFFSET (1). The mobile station apparatus also transmits a first reference signal on a first antenna port and a second reference signal on a second antenna port. In addition, the mobile station apparatus sets a first transmit power for a transmission of the first reference signal based on at least the first parameter POFFSET (0), a maximum transmit power value, a path loss and a transmission power control command. The mobile station apparatus also sets a second transmit power for a transmission of the second reference signal based on at least the second parameter POFFSET (1), a maximum transmit power value, a path loss and a transmission power control command.

Abstract: A system can provide quality-of-service based network resource allocation and utilization in a dynamic network environment. A system may determine a current quality level of current media data presented to a user by a remote system in communication with the first system. The system may determine if it can provide subsequent media data to the remote system at a higher quality level than the current quality level. As one example, the system may identify a network connection with the remote system that supports providing the subsequent media data at the higher quality level to the remote system. The system may then obtain the subsequent media data at the higher quality level and send the subsequent media data at the higher quality level to the remote system.

Abstract: The invention relates to a method and an arrangement for encoding of signals in teleconferencing. The method involves receiving (502) signals from a plurality of nodes participating in a teleconference and analyzing (504) said signals. The method further involves appointing (506) one of the received signals as being a dominant signal and adapting (508) an encoder based on information related to the dominant signal. At least two of the received signals are mixed and then encoded (512), using the adapted encoder. The encoded mixed signal is then provided (514) to at least one of the nodes participating in the teleconference.

Abstract: A method determines the relative locations of wirelessly controllable service device nodes and switching control nodes within a building. At least some of the service device nodes are located in different rooms of the building and should be allocated to switching control nodes on a room-specific basis. Wireless communication is established between the nodes to determine relative spatial positions of selected nodes using received signal strength indication (RSSI) values indicative of a distance of separation between two communicating nodes. The service device nodes are then grouped into two or more groups, a first group corresponding to service device nodes in one room and a second group corresponding to service device nodes in a second room, based on spatial distribution of the service device nodes as indicated by the RSSI values. The service device nodes of each group are then allocated to at least one associated switching control node.

Abstract: A system for measuring a full spectrum of a modulated output signal provided by a device under test (DUT) includes a signal generating device that provides a radio frequency (RF) stimulus signal to the DUT, and generates a trigger signal, where the DUT outputs the modulated output signal in response. A receiver, having an intermediate frequency (IF) bandwidth less than a total bandwidth of the modulated output signal, includes mixers, an analog-to-digital converter (ADC) triggered by the trigger signal, and a local oscillator (LO) that consecutively generates multiple LO signals having different LO frequencies. A harmonic phase reference (HPR) generator generates a repetitive HPR signal having an HPR bandwidth wider than the total bandwidth of the modulated output signal and a modulation repetition rate the same as that of the RF stimulus signal.