Abstract: A circuit for transmitting a signal has a first signal line and a second signal line, wherein the second signal line is arranged adjacent to the first signal line, such that an interaction between signals being transmitted on the signal lines takes place. The circuit further comprises a first driver for driving a first signal on the first signal line, wherein the first signal comprises a delay. A second driver is configured for driving a second signal on the second signal line depending on the delay of the first signal, such that the delay of the first signal is adjusted due to the interaction of the second signal on the first signal. A method and computer program are also disclosed.

Abstract: Input signals of each frame are encoded by mapping the signals onto a coordinate system dictated by the symbols of the previous frame, and symbols from a constellation are selected based on the results of such mapping. Received signals are detected by preprocessing the signals detected at each antenna with signals detected by the antenna at the immediately previous frame, and then applied to a maximum likelihood detector circuit, followed by an inverse mapping circuit.

Abstract: The present invention provides a portable device comprising: a control unit; a display coupled to the control unit; a dual wireless module coupled to the control unit for wireless data transferring, wherein the dual wireless module includes a first and a second wireless data transferring modules to allow a user to select desired one to communicate with an external device. The dual wireless module further includes a management unit to manage the first and second wireless data transferring modules according to a policy engine.

Abstract: Apparatus and method for generating first, second and third carrier frequencies of 3432 MHz, 3960 MHz and 4488 MHz respectively, for use in a wireless transmission system deploy only first and second PLLs which are configured to generate 6336 MHz and 2640 MHz signals respectively with only in-phase components. Frequency dividers are employed for frequency-dividing the 6336 MHz signal severally by 2, 4, and 12 to obtain frequency-divided intermediate outputs with both in-phase and quadrature components. The intermediate output components and other intermediate signal components are selectively combined in a mixer (e.g., a single side-band mixer), for deriving the first, second and third carrier frequencies of 3432 MHz, 3960 MHz and 4488 MHz with both in-phase and quadrature components. The invention has application in UWB, WPAN, WLAN, or other wireless systems and has the simplicity and advantages of using only two PLLs instead of the prior art arrangements of three PLLs.

Abstract: A handheld device includes a first wireless transceiver and a second wireless transceiver. The first wireless transceiver is used for implementing normal communication. The second wireless transceiver is used for abnormal conditions. When the first wireless transceiver is used, the second wireless transceiver is disabled for saving electrical energy. The second wireless transceiver uses a different frequency from the first wireless transceiver. The second wireless transceiver can be used to establish a wireless link directly between the handheld device and a rescuing center without using base transceiver stations.

Abstract: An iterative multistage detection system and method for orthogonally multiplexing K channels onto a signal processing chain using N orthogonal sequences of length N. The K channels include a first set of N channels and a second set of M channels (the M channels being separate and distinct from the N channels), where K=N+M. In a first iteration, interference from the first set of N channels imparted on the second set of M channels is removed from the multiplexed signal, thereby enabling the symbol values associated with the second set of M channels to be reliably estimated. In a second iteration, interference from the second set of M channels imparted on the first set of N channels is removed from the first set of N channels, thereby enabling the symbol values associated with the first set of N channels to be reliably estimated.

Abstract: An iterative multistage detection system and method for orthogonally multiplexing K channels onto a signal processing chain using N orthogonal sequences of length N. The K channels include a first set of N channels and a second set of M channels (the M channels being separate and distinct from the N channels), where K=N+M. In a first iteration, interference from the first set of N channels imparted on the second set of M channels is removed from the multiplexed signal, thereby enabling the symbol values associated with the second set of M channels to be reliably estimated. In a second iteration, interference from the second set of M channels imparted on the first set of N channels is removed from the first set of N channels, thereby enabling the symbol values associated with the first set of N channels to be reliably estimated.

Abstract: Aspects of a method and system for simultaneous signal transmission on multiple selected frequencies may include generating from a single baseband signal, a plurality of radio frequency transmission signals each at a different radio frequency, wherein the single baseband signal comprises an in-phase signal component and/or a quadrature signal component. The single baseband signal, to generate said plurality of radio frequency transmission signals, may be modulated in a single radio frequency transmission chain, the radio frequency transmission chain comprising intermediate frequency modulation and radio frequency modulation. The plurality of radio frequency transmission signals may be a radio frequency signal and a corresponding image frequency signal, based on the intermediate frequency modulation and the radio frequency modulation.

Abstract: Radio transmissions to multiple radio terminals are improved using scheduled backoff of a multi-signal power amplifier. A radio channel quality associated with each of the radio terminals is determined. First signals for first radio terminals associated with a better channel quality are amplified by a power amplifier during a first time period resulting in a first composite output signal. Second signals for second radio terminals associated with a lower channel quality are amplified by the power amplifier during a second time period resulting in a second composite output signal. Transmission during the first time period occurs at a first power level, e.g., mean power, that is associated with a lower probability of clipping the first composite output signal. During the second time period, the second composite signal is transmitted at a second power level, e.g., mean power, higher than the first power level which improves reception at the second terminals.

Abstract: A power amplification apparatus and method for amplifying a baseband signal having a high peak-to-average power ratio (PAR) are provided. The power amplification apparatus and method comprise a signal generation section for generating a peak-reduced signal obtained by subtracting a peak value from the baseband signal and an error signal representing a difference between the baseband signal and the peak-reduced signal and for outputting the generated signals; a peak-reduced signal amplification section for amplifying the peak-reduced signal output from the signal generation section in a radio frequency band; an error correction amplification section for amplifying the error signal output from the signal generation section in the radio frequency band; and a summer for coupling and outputting the signal amplified by the peak-reduced signal amplification section and the signal amplified by the error correction amplification section.

Abstract: An iterative multistage detection system and method for orthogonally multiplexing K channels onto a signal processing chain using N orthogonal sequences of length N. The K channels include a first set of N channels and a second set of M channels (the M channels being separate and distinct from the N channels), where K=N+M. In a first iteration, interference from the first set of N channels imparted on the second set of M channels is removed from the multiplexed signal, thereby enabling the symbol values associated with the second set of M channels to be reliably estimated. In a second iteration, interference from the second set of M channels imparted on the first set of N channels is removed from the first set of N channels, thereby enabling the symbol values associated with the first set of N channels to be reliably estimated.

Abstract: A transmitting apparatus includes a plurality of antenna elements, user signal output unit, calibration signal generation unit, antenna signal processing unit, and total transmission power measuring unit. The user signal output unit weights a user signal by an antenna weight and outputs it to each antenna element. The calibration signal generation unit outputs a calibration signal to be used to detect the characteristic of a transmission path. The antenna signal processing unit provided in the transmission path executes spread modulation and multiplexing for the user signal and calibration signal and outputs a multiplexed signal. The total transmission power measuring unit measures the value of total transmission power of the multiplexed signal to be transmitted from each antenna element on the basis of the multiplexed signal input from the antenna signal processing unit. An antenna weight correction unit executes a correction operation on the basis of the total transmission power value.

Abstract: Capacity of radio links in an in-building cellular communication system is currently limited by bandwidth available for a communications link between a terminal and a single base station. The present invention mitigates this limitation by permitting the terminal to establish a number of communications links with a number of base stations. Content data is distributed in parallel over the number of communications links.

Abstract: A radio communication apparatus at a transmission side that includes a plurality of transmission antennas and performs a communication using at least one carrier. The radio communication apparatus includes a channel dividing unit configured to divide a transmission signal into a plurality of channels based on channel structure information returned from another radio communication apparatus at a reception side and indicating a structure of a space-division-multiplexing-channel and a space-time-coding channel between transmission and reception antennas, and a space-time-coding unit configured to realize transmission diversity by performing a space-time-coding processing for each of the plurality of channels.

Abstract: Downlink diversity in a CDMA system is provided by employing Walsh codes in conjunction with M transmit antennas at a common base station serving K mobiles, where M may or may not be to equal to K. The present invention provides methods and apparatus for improving downlink diversity in a CDMA system. Each transmit antenna transmits a signal representing the result of the modulation of Walsh codes by data signals for each of the K mobiles, assuming there is data pertaining to a particular mobile. The assignment of Walsh codes is accomplished in accordance with a transmission matrix T. The transmission matrix maps the user data symbols onto the Walsh codes for each antenna and is preferably designed such that its columns are representative of the transmit antennas and orthogonal.

Abstract: A preamble generation method and apparatus are provided for improving transmit diversity by changing a preamble structure in a broadband wireless communication system using multiple antennas based on a multiple input multiple output (MIMO) scheme. First pilot tones associated with different antennas are selected. The first pilot tones are multiplied by different first Walsh codes. Second pilot tones associated with the same antenna are sequentially selected along a frequency axis. The second pilot tones are multiplied by a second Walsh code. Preambles are generated by assigning, to at least two symbol durations, output signals multiplied by the first and second Walsh codes. Consecutive pilot tones during each of the at least two symbol durations are spaced by one pilot tone, and code streams of the first and second Walsh codes are alternately multiplied by the pilot tones. The preamble structure has orthogonality between the antennas using frequency, time and code domains.

Abstract: Circuit scale and power consumption of a base station is reduced with a feature of a sector-free configuration in routing processing. The feature is realized in a base station having transmitters corresponding to a plurality of sectors, as there are a switch distributing signals corresponding to a plurality of subcarriers to the plurality of sectors, respectively, and an inverse Fourier transform processor performing inverse Fourier transform processing on the signals for the plurality of sectors distributed by the switch, so as to supply to each corresponding transmitter among transmitters corresponding to the plurality of sectors.

Abstract: Transmission diversity and adaptive array antenna transmission is executed with respect to a user to which a shared channel is assigned, or a pilot channel is shared a like a shared channel. By this means it is made possible to secure a large number of users without code resource shortages even where adaptive array antenna is applied to a shared channel.

Abstract: An iterative multistage detection system and method for orthogonally multiplexing K channels onto a signal processing chain using N orthogonal sequences of length N. The K channels include a first set of N channels and a second set of M channels (the M channels being separate and distinct from the N channels), where K=N+M. In a first iteration, interference from the first set of N channels imparted on the second set of M channels is removed from the multiplexed signal, thereby enabling the symbol values associated with the second set of M channels to be reliably estimated. In a second iteration, interference from the second set of M channels imparted on the first set of N channels is removed from the first set of N channels, thereby enabling the symbol values associated with the first set of N channels to be reliably estimated.

Abstract: The present invention relates to a method of reducing a peak-to-average power ratio of a signal to be transmitted. The method comprises the steps of detecting a portion of the signal being above a clipping threshold level, decomposing the portion of the signal into a number of functions, the number of functions being proportional to a duration of the portion of the signal, performing the number of soft-clippings on the signal by means of a reference function, the positions of the soft-clippings being given by the positions of the functions and the respective scalings of the reference function being determined by the amplitudes of the functions.

Abstract: Digital signal processing generates IF modulated digital data which is then converted to analog using a high sample rate digital-to-analog converter (DAC) without first producing a baseband signal that is to be upconverted to IF. The digital data has a high sample rate that is a whole multiple of a specified IF signal. A DAC converts the digital data into a continuous waveform IF signal that is produced to a feed-forward filter that eliminates spectral copies of the signal. The sample rate is selected so that harmonic signals do not appear in specified signal bands. Various embodiments include sample rates of 104 and 338 MHz (GSM application). The 26 MHz IF filtered signal produced by the feed-forward filter is then produced to a translational loop that produces a corresponding output oscillation (RF transmit signal).

Abstract: In a communication apparatus, effective automatic power control (APC) is realized, transmission object signal level changing units change a level of a transmission object signal of each channel, and transmission filter units carry out filtering for a signal of each channel after its level was changed with a characteristic for allowing a passage of a frequency component of each channel, and a transmission signal coupling unit couples signals of plural channels after the filtering was carried out, and an antenna transmits a coupled signal by wireless, and coupled signal dividing units divide a part of the coupled signal into a plurality of signals, and level detection filter units carry out filtering for each divided signal with an identical characteristic to the above-described characteristic and signal level detecting units detect a level of a signal of each channel after the filtering was carried out, and a transmission object signal level change mode controlling unit controls a level change mode of a transm

Abstract: In a portable phone having installed therein a PHS and a WLAN, the PHS is used for standby as long as the PHS is in the coverage area. At the time of receiving an incoming call during standby by the PHS with only the PHS being ON, the power of WLAN is turned ON. If the WLAN is in the coverage area, the incoming call is once disconnected, and immediately a VoIP call is sent (call back) by the WLAN. At this time, the PHS is turned OFF. On the other hand, if the WLAN is out of the coverage area at the time of receiving the incoming call, the call is similarly disconnected, after which the WLAN is turned OFF and the VoIP call is sent by the PHS.

Abstract: A MIMO wireless communication system and wireless communication apparatuses are disclosed that increase the practically usable communication channel capacity in the Shannon channel capacity that determines the ratio of maximum signal transmission speed to frequency. Each wireless communication apparatus includes antenna units that transmit and receive radio frequency signals, and a weight controlling unit that provides weights with respect to the antenna units. The antenna units are formed by adaptive array antenna units that can change the directivity by varying weights with respect to antenna elements.

Abstract: A waveform-adaptive ultra-wideband (UWB) transmitter and noise-tracking UWB receiver for use in communications, object detection and radar applications. In one embodiment, the output of an oscillator is gated by a low-level impulse generator either directly or through an optional filter. In a special case of that embodiment wherein the oscillator is zero frequency and outputs a DC bias, a low-level impulse generator impulse-excites a bandpass filter to produce an UWB signal having an adjustable center frequency and desired bandwidth based on a characteristic of the filter. In another embodiment, the low-level impulse signal is approximated by a time-gated continuous-wave oscillator to produce an extremely wide bandwidth pulse with deterministic center frequency and bandwidth characteristics. The low-level impulse signal can be generated digitally. The UWB signal may be modulated to carry data, or may be used in object detection or ranging applications.

Abstract: Upon determining (11) a need to transmit a message (such as a paging message) to a mobile station within a multi-band wireless communications system, the system (via, for example, a mobile switching center) identifies (12) discrete geographic locations within the system having a likelihood of presently supporting the mobile station and further identifies (13) a band within the multi-band system that also has a present likelihood of presently supporting the mobile station. This information is then used (14) (for example, by a base station controller) to identify one or more communication resources to be allocated for use when transmitting the message.

Abstract: The present invention aims to provide a radio base station that has equivalently high reception sensitivity without increasing the number of antenna elements while keeping the utilization efficiency of time slots high. The radio base station comprises a radio unit 101 and a radio unit 102. Two time slots, one at each radio unit, are allocated to a mobile station. After a signal transmitted from the mobile station is received and demodulated, a piece of data received by the radio unit 101 is compared with a piece of data received by the radio unit 102 so that one of the pieces of data that has fewer errors is selected.

Abstract: The present invention provides a radio communication system in which not only a communication unit operating in a slave mode but also a communication unit operating in a master mode can be changed into a power saving mode. Among a plurality of communication units, one of them is operating in the master mode while the others are operating in the slave mode. Only the communication units operating in the slave mode are allowed to be changed into a suspend state. The communication unit operating in the master mode stops transmission/reception in synchronization with transition into the stop state of the communication units operating in the slave mode.

Abstract: A wireless communication device comprises a plurality of receive signal paths, each of the receive signal paths is configured to receive signals in a certain frequency bandwidth. The communication device also comprises an amplifier coupled with each of the plurality of receive signal paths. The amplifier is configured to amplify the receive signals associated with each of the plurality of receive signal paths.

Abstract: The system of a content head end of a distribution system includes a program multiplexer, a multi-channel modulating module, a channel multiplexer, a digital-to-analog converter and a frequency block-up converter, all arranged in a sequential configuration. Packets representing respective content programs are fed to the program multiplexer. The program multiplexer multiplexes the packets into an output queue. Packets from the output queue are then fed to the multi-channel modulating module. The multi-channel modulating module receives the packets and routes them to various modulators representing corresponding RF channels. The various modulators then modulate the respective packets to generate corresponding RF signals. These RF signals are then multiplexed by the channel multiplexer into a multi-channel RF signal. The multi-channel RF signal is then forwarded to the digital-to-analog converter for conversion into an analog, multi-channel RF signal.

Abstract: An apparatus comprises first and second radios, an antenna, a four-port combiner connected between each of the first and second radios and the antenna, a complex vector modulator for producing a correction signal in response to a sample signal and an error signal, a first switch for routing the sample signal to the complex vector modulator and for routing the correction signal to one of the first and second radios, and a second switch for routing the error signal to the complex vector modulator.

Abstract: A communication system utilizing an adjustable link has at least a first data transmission circuit including at least a first communication link circuit. The first communication link circuit has a baseband circuit and at least a passband circuit. The baseband circuit corresponds to a baseband sub-channel and the passband circuit corresponds to a passband sub-channel. The first communication link circuit also includes a circuit that distributes a first subset of a data stream having a first symbol rate to the baseband circuit and a second subset of the data stream having a second symbol rate to the passband circuit. The baseband sub-channel and the passband sub-channel are separated by an adjacent guardband of frequencies. The passband carrier frequency is adjusted to define the guardband and the guardband corresponds to a first notch in a channel response of a first communications channel.

Abstract: Systems and methods of ultra-wideband communication are provided. In one ultra-wideband communication method, a communication channel is divided into a plurality of non-overlapping sub-channels by dividing a single serial message intended for an ultra-wideband communication device into a plurality of parallel messages. Each of the plurality of parallel messages are then encoded onto at least some of the plurality of sub-channels, and then transmitted. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the subject matter of the disclosure contained herein. This Abstract is submitted with the explicit understanding that it will not be used to interpret or to limit the scope or the meaning of the claims.

Abstract: In a transmitter 2A, after an output level of a modulated signal is regulated by a first gain regulator 5A, the signal is transmitted from a first antenna 8A without delay, and after the modulated signal is delayed by a delay unit 6A and an output level of the delay output is regulated by a second gain regulator 7A, this signal is transmitted from a second antenna 9A. Similarly, in a transmitter 2B, after an output level of a modulated signal is regulated by a first gain regulator 5B, the signal is transmitted from a first antenna 8B without delay, and after the modulated signal is delayed by a delay unit 6B and an output level of the delay output is regulated by a second gain regulator 7B, this signal is transmitted from a second antenna 9B. A receiver 3 receives the transmitted signals from the four antennas 8A, 8B, 9A and 9B via an antenna 10, and executes a demodulation process.

Abstract: A method and system is disclosed for transmitting two related channels of signals through the air. A first channel of signals is modulated with a first carrier frequency, and a second channel of signals is modulated with a second carrier frequency. The modulated first channel of signals and the second channel of signals are then combined through a high isolation combiner. Thereafter, the combined signals are transmitted toward a receiver system. After receiving the transmitted signals, the first channel and the second channel of signals are regenerated in the receiver system by separating one from the other.

Abstract: A programmable telemetry circuit that may be programmed for high bandwidth, low Q; low bandwidth, high Q; or for other parameters. The programmable telemetry circuit may include a first coil; a high impedance path having a first node connected to a first node of the first coil; a low impedance path having a first node connected to the first node of the first coil; a capacitive path having a first node connected to a second node of the first coil; and an input path for coupling signals into the high impedance path, the low impedance path, and the capacitive path. The low impedance path may be connected in parallel with the high impedance path. The capacitive path may form a circuitous path with the high impedance path and the low impedance path. The programmable circuit may be programmed to select the high impedance path or the low impedance path.

Abstract: The invention relates to for processing an electromagnetic input signal, wherein the signal is passed through an input to be modified across a plurality of modifying segments using a characteristic of the signal, and wherein the plurality of segments have a plurality of states controlled by a control signal, by determining a reference impedance for the input for one or more states of the plurality of segments; and adaptively adjusting impedance of the input toward the reference impedance. This may be accomplished for example, by using a matching circuit comprising one or more selected from the group consisting of a digital signal processor, a microprocessor, a logic circuit, an integrated circuit, a phase shifter, a resistor, a variable inductor, and a variable capacitor. The matching circuit determines shifts in impedance of the input after a change in state of the segments; and adaptively adjusts the impedance based upon the shift.

Abstract: System and method for preprocessing a signal for transmission by a power amplifier. In a preferred embodiment a multiple input multiple output processor is coupled to a plurality of power amplifiers for transmitting a signal, where the number of power amplifiers exceeds the number of antennas. The multiple input multiple output processor performs an algorithm to optimize the output vector ensuring that the transmit power for any one amplifier is below a predetermined threshold. In a preferred embodiment a Remez optimization algorithm is performed. Alternative optimization algorithms may be used. In a preferred embodiment the processor is a single integrated circuit. A method is disclosed where a multiple output vector is produced for transmission, using an optimization algorithm to produce an output vector that ensures that for any of the power amplifiers, the transmit power is maintained below a predetermined threshold.

Abstract: The disclosed embodiments relate to a system and method for providing user specific beams in a fixed beam network. In one embodiment, there is provided a mobile transceiver comprising a first device configured to receive phase reference signal data from a base station, the phase reference signal data being indicative of a first phase reference signal and a second phase reference signal that may be used by the mobile transceiver during a communication session, and a second device configured to determine whether the second phase reference signal is likely to provide improved reception between the base station and the mobile transceiver with respect to the first phase reference signal, wherein the second device is configured to transmit data to the base station, the data being indicative of whether the first phase reference signal or the second phase reference signal is likely to provide improved reception between the base station and the mobile transceiver.

Abstract: A radio transmitting apparatus that has a plurality of antennas and changes the number of modulated signals transmitted simultaneously according to the propagation environment and so forth. A transmission power changing section 12 of a radio transmitting apparatus of the present invention adjusts the pilot symbol signal level so as to match the data symbol composite signal level according to the number of transmit modulated signals set by a modulated signal number setting section 11. By this means, the operating range of received pilot symbols and the operating range of received data symbols become approximately the same on the receiving side, enabling pilot symbol quantization error to be reduced. As a result, the precision of radio wave propagation environment estimation, time synchronization, and frequency offset estimation using pilot symbols improves, and consequently data reception quality improves.

Abstract: Transmitter and receiver functionality are separated in dual-mode radio transceivers to support high-rate services. Transceivers with highly asymmetric requirements that need only a high-rate transmission or only high-rate reception functionality are supported by including a high-rate transmitter to support pushing data out or a high-rate receiver to support pulling data into the transceiver at high data rates.

Abstract: Communication is performed for a first communication device having a set of antenna elements. A quality-indication signal is received from a second communication device. A complex weighting is calculated based on the quality-indication signal. A pre-transmission signal is modified based on the complex weighting to produce a set of modified-pre-transmission signals. Each modified pre-transmission signal from the set of modified-pre-transmission signals is uniquely associated with an antenna element from the set of antenna elements. The set of modified-pre-transmission signals is sent from the set of antenna elements to produce a transmitted signal.

Abstract: A transceiver for communicating a multi-tone modulated communication channel on a subscriber line. The transceiver includes: a digital signal processor (DSP) with a Fourier transform module and an analog front end (AFE). The DSP determines an available range of frequencies on the subscriber line and expands or contracts the tone spacing of each of a fixed number “N” of tones accordingly by decreasing or increasing the processing interval associated with the Fourier transform of each tone set. The AFE performs digital-to-analog conversion of the multi-tone modulated communication channel at rates compatible with the processing interval of the Fourier transform module; whereby the range of frequencies spanned by the modulated tones on the subscriber line conforms to the available of frequencies on the subscriber line.

Abstract: An apparatus for transmitting and receiving multiple frequencies on a single antenna is provided. The apparatus includes a first transmitter configured to transmit signals on a first frequency to an antenna, and at least one receiver configured to receive signals on a second frequency from the antenna. The apparatus also includes a notch filter coupled to the first transmitter and configured to reject a component at the second frequency from a signal transmitted by the first transmitter.

Abstract: Described is a method and device for wireless communications on multiple frequency bands. The device comprises a communications arrangement and a processor. The communications arrangement receives radio frequency (RF) maps from a plurality of wireless communication devices. The RF maps are indicative of wireless activity in respective environments of the plurality of wireless devices. The processor generates a frequency band hopping sequence as a function of the RF maps. The frequency band hopping sequence is transmitted to the plurality of devices.

Abstract: An apparatus and method for wireless high speed data transmission in a communication system are described. In one embodiment, the apparatus comprises multiple radio-frequency (RF) signal generators to generate multiple RF signals and a switch having inputs coupled to receive the RF signals and to receive data from a data source. The switch has an output that outputs one of RF signals based on the data.

Abstract: In a system (e.g. a IR or RF based wireless remote control system) comprising a number (N) of non-synchronized transmitters that transmit respective signals, a method of transmitting data in packets to a receiver, comprising the steps of: transmitting the respective signals, said signals having repeated burst periods that are separated by quiescent periods and repeated with mutually different repetition period, wherein the burst periods have substantially the same length, BL, and each burst period comprises a data packet. The method is characterized in that (I) where N denotes the number of transmitters, n is an index denoting a respective one of the N transmitters, RPn is the repetition period for a transmitter with index n, and BL is the length of the burst periods.

Abstract: A communication apparatus based on the multi-carrier modulation system may be included in a mobile station or a base station for simultaneous transmission and reception with a simplified structure between the mobile station and base station using in common the same frequency band. A communication apparatus based on a multi-carrier modulation system for simultaneous communications with a plurality of sub-carriers using a plurality of sub-carriers modulated with data respectively, comprising a transmitting unit operable to transmit data with a plurality of sub-carriers by modulating a sub-carrier among the plurality of sub-carriers with data, and operable to use the other sub-carriers a receiving band without modulation with the data.

Abstract: An approach provides for limiting power adjustment in a wireless system (e.g., cellular network) to extend, for example, talk time. Parameter values specifying operating conditions of the wireless terminal are collected for power adjustment of a radio frequency (RF) amplifier within the wireless terminal. A power adjustment factor is computed based on the parameter values, wherein the power adjustment factor is used adjust limiting power of the RF amplifier.

Abstract: A transducer-based sensor system including a drive signal generator for generating a drive signal, a transducer coupled to the drive signal generator and configured to receive the drive signal, a mixer coupled to the transducer and configured to receive output from the transducer where such output results at least in part from physical movement of the transducer, and a diplexer operatively coupled with an output of the mixer and configured to present a substantially matched output impedance to the mixer over an operative range of output frequencies.