Abstract: With the object of accurately reproducing, by means of a small-scale circuit, differences in propagation delay at antennas of received signals that are received as input by way of each of a plurality of receivers, frequency data generator 6 supplies frequency data that contain a frequency component that is synchronized in common to the plurality of receivers 2-1 to 2-n. At receiver 2-n, local oscillation signal generator 3-n, which is represented by a D/A converter, generates a local oscillation signal from frequency data that have been synchronized in common. The passing phase of a received signal that is outputted from antenna 1-n by way of receiver 1-n is thus fixed, and as a result, the phase difference of received signals that are received by DSP 8 by way of the plurality of receivers 2-1 to 2-n becomes the propagation delay difference of the received signals.

Abstract: A method and an apparatus for serial data communication employs a data transmission process which transmits data from one control unit to the another control unit and at the same time checks a reception confirmation signal on each number of the data by transmitting a clock signal, and a data reception process which receives the data on the one control unit from the other control unit and checks a transmission confirmation signal on the each number of the data by transmitting the clock signal. The apparatus comprises a first and a second control unit, four serial buses for performing serial data communication between the both control units, two pull-up operation units for continuing control voltage of the serial buses at a certain level, and a control voltage matching unit for continuing voltage equilibrium condition.

Abstract: In a mobile radio terminal at transmission timing control device, transmit data spread-modulated is delayed by a timing control portion with a timing of reception as a reference by a predetermined period of time having based on a unit time corresponding to a chip clock and it is then provided to a filtering portion. The filtering portion limits the transmit data in band and a timing control portion times transmission with a slight adjustment with an oversampling clock, a quadruple in frequency of the chip clock, serving as a unit time. In a mobile radio terminal at a digital roll-off filter, input digital data is held in accordance with a data period by a shift register successively. A counter counts in accordance with an oversampling period of 1/m and it is reset in accordance with a data period.

Abstract: A signal that has been received over a first channel is estimated. A set of channels that the signal will be received over is determined. Based on the estimated signal and the set of channels, the signal is removed from a plurality of signals received over a second channel.

Abstract: A method and system for the synchronization of the transmission of digitally converted analog modem signals between two or more modems using either RF over-the-air or A/C power line communication channels. This invention provides for modem speed optimization my minimizing or eliminating clock variance between the modems in a digital communication system. A fixed delay is created and maintained during modem operation. This invention is also adapted to function in a full-duplex communication system maintaining a fixed delay in both directions.

Abstract: A method of processing an AM radio signal comprises the step of receiving an AM radio signal including an upper sideband portion and a lower sideband portion, demodulating the upper sideband portion and the lower sideband portion to produce a demodulated upper sideband signal and a demodulated lower sideband signal, weighting the demodulated upper sideband signal and the demodulated lower sideband signal in response to noise power to produce a weighted demodulated upper sideband signal and a weighted demodulated lower sideband signal, and combining the weighted demodulated upper sideband signal and the weighted demodulated lower sideband signal to produce an output signal. Demodulators which process AM radio signals in accordance with the method, and receivers incorporating the demodulators, are also included.

Abstract: A self-calibrating transmitter includes an up-conversion mixing module, summing module, calibration determination module, and a calibration execution module. The up-conversion mixing module is operably coupled to mix an I component of a base-band signal with an I component of a local oscillation to produce a mixed I signal and is also operably coupled to mix a Q component of the base-band signal with a Q component of the local oscillation to produce a mixed Q signal. The summing module sums the mixed I signal with the mixed Q signal to produce a modulated radio frequency (RF) signal. The calibration determination module is operably coupled to produce a calibration signal, which it generates by interpreting the local oscillation and the modulated RF signal. The calibration execution module is operably coupled to calibrate the DC level of the I and/or Q component of the base-band signal, and/or the gain of the I and/or Q component of the base-band signal based on the calibration signal.

Abstract: An method and apparatus for provisioning multiple Next and fractional T1 along with packet based communications over a shared X-DSL communication link is disclosed. The communication link may be wired or wireless. The current invention provides a method and apparatus for flexibly provisioning businesses and other high bandwidth users, with multiple communication channels and multiple service types, both packet based and SDM/TDM. An efficient and configurable method and apparatus for multiplexing of both packets and STM channels on to a single VDSL frame is disclosed. At the receiver in the NT the VDSL receiver as explained is configured to de-multiplex individual channels and route them to individual users/suits within the building.

Abstract: A method of transmitting and receiving a spread spectrum signal, wherein a product of a lower bit rate signal and a second PN-code equals the bit rate of a higher bit rate signal, and wherein a first PN-code sequence is used to spread the product or the higher bit rate signal to a predetermined output chip rate signal which is transmitted. At a receiver, the spread spectrum signal is received and demodulated and in a first operation the demodulated signal is correlated with the first PN-code sequence and in a second operation the output from the first mentioned correlating step is correlated with the second PN-code sequence. The demodulated signal is treated as either a higher bit rate signal or a lower bit rate signal based on the first and second correlations operations.

Abstract: The invention relates to a transmitter of radio signals (SMS), which are amplitude-modulated according to a discrete plurality of amplitude levels, in which at least one output power transistor (6) receives, on one of its terminals, a bias-voltage level which is adapted to the amplitude level represented by the instantaneous value of a selection signal (SS) generated by analysis means (11) on the basis of the digital control signals (1). The electrical consumption is hence optimized.

Abstract: A method for obtaining a gain function by using an array of antennae and a weighting of the signals received or to be transmitted by vectors of complex coefficients. The complex coefficients are referred to as weighing vectors, according to which, a reference gain function being given, the reference gain function is projected orthogonally onto the sub-space of a gain function. The sub-space of the gain function is generated by the weighting vectors of the space of the gain functions. The weighting vectors of the space of the gain functions are provided in advance with a norm, and a weighing vector generating the reference gain function thus projected is chosen as the optimum weighting vector.

Abstract: A digital demodulator which coherently demodulates a low-IF or zero-IF complex signal using a complex-valued phase-locked loop (CPPL). The CPPL includes a numerical controlled oscillator, four multipliers and two combiners to provide independent phase/frequency and amplitude outputs. The CPLL exhibits in first order PLL dynamics without a loop filter in the feedback loop to the NCO. However a filter with one or more poles may be included in the feedback circuit to exhibit 2nd or higher order PLL dynamics. The CPLL allows coherent demodulation of extremely low FM modulation indexes whereby the incoming frequency drift may be larger than the frequency deviation. It can also be used to coherently demodulate signals which have combined amplitude and phase characteristics.

Abstract: In a radio signal transmitter, a microcomputer operates by receiving an output voltage of a battery to sequentially generate a voltage boosting control signal. This voltage boosting control signal has a longer high level period as generated later. The voltage booster circuit boosts the output voltage of the battery by increasing the number of times of oscillating operations during the high level period of the voltage boosting control signal depending on the increased high level period.

Abstract: Techniques to generate FH sequences having excellent correlation properties and to use these FH sequences in multi-band communication systems (e.g., OFDM systems). In one aspect, FH sequences may be generated based on an algebraic expression y(k)=log? b/k (mod p), where k is an index, p is an odd prime number, ? is a primitive root of p, b is an integer, and (mod p) denotes modulo-p operation. Different FH sequences may be generated with different values for b, ?, and/or p. In another aspect, data may be transmitted using FH sequences generated based on the expression y(k)=log? b/k (mod p). In a first scheme, data may be transmitted on “traffic” channels, each of which may be associated with a respective FH sequence that determines the specific subband to use in each slot. In a second scheme, each data transmission is sent on subbands determined based on all or a portion of an FH sequence.

Abstract: A super set of space-time block codes is combined with set partitioning to form super-orthogonal space-time trellis codes having full diversity, enhanced coding gains, and improved rates. In communications systems, these codes are implemented by an encoder of a diverse transmitter to send an information signal to a receiver having one or more receiver elements. A decoder in the receiver decodes the encoded signal to reproduce the information signal. A method of the invention is used to generate set partitioning structures and trellis structures that enable code designers to systematically design the codes of the invention.

Abstract: According to the present invention, a three-line bus is used for communication between a first digital unit (1) and two other digital units (3). The three-line bus includes a system clock line (SCL) as well as a data transmission line (SD) through which data is sent from the two other units (3), i.e. transmitting units, to the first unit (1), i.e. receiving unit. The system uses an authorization line (WS) for determining which of the two transmitting units (3) is capable of writing data on the data transmission line (SD) and when it can do so. The communication from the first unit (1), now operating as a transmitter, to the two other units (3), now operating as receivers, is made possible by the fact that data signals are also injected in the authorization line (WS) and transmitted through the line together with the authorization control signals.

Abstract: A high-speed serial data transceiver includes multiple receivers and transmitters for receiving and transmitting multiple analog, serial data signals at multi-gigabit-per-second data rates. Each receiver includes a timing recovery system for tracking a phase and a frequency of the serial data signal associated with the receiver. The timing recovery system includes a phase interpolator responsive to phase control signals and a set of reference signals having different predetermined phases. The phase interpolator derives a sampling signal, having an interpolated phase, to sample the serial data signal. The timing recovery system in each receiver independently phase-aligns and frequency synchronizes the sampling signal to the serial data signal associated with the receiver. A receiver can include multiple paths for sampling a received, serial data signal in accordance with multiple time-staggered sampling signals, each having an interpolated phase.

Abstract: To generate a high-power modulated radio frequency signal SOUT from an input low or medium frequency information signal SIN, the information signal is pulse-shaped in a quantifier to form a digital signal SD having discrete signal values. The digital signal is processed in a switching unit comprising switches for each signal value, in radio frequency wave generators for each switch generating carrier waves of radio frequency, and in control circuits for each switch to control the opening and closing thereof. When a switch is closed, its associated generator is connected to the output line of the switching unit, and when it is opened, the generator is disconnected therefrom. In the switching unit, a switched radio frequency signal SSW carrying the information of the input signal is formed by opening and closing the switches when the digital signal adopts or does not adopt, respectively, the signal value associated with the respective switch.

Abstract: A reverse data rate controlling method in a mobile communication system for transmission of packet data is provided. In an embodiment of the present invention, an RRL (Reverse Rate Limit) message includes an ignore RAB (Reverse Activity Bit) field to ensure a predetermined data rate for a particular access terminal (AT). In another embodiment of the present invention, an access probability is set for each data rate in the RRL message. Upon receipt of an RAB, an AT compares a random number with the access probability for its data rate and increases or decreases the data rate according to the comparison result.

Abstract: Signal detection having superior resistance with respect to feature distortions is realized. Reference and input feature time-series signals, each consisting of feature vectors, are respectively obtained from reference and input time-series signals. The reference and input feature time-series signals are respectively converted into reference and input coded time-series signals, each consisting of codes indicating classifications. A distortion is added to at least one signal of the reference and input time-series signals, the reference and input feature time-series signals, and the reference and input coded time-series signals. The degree of similarity between the reference time-series signal and a collation portion determined in the input coded time-series signal is calculated based on their histograms.