Abstract: A wireless communication device includes a processor. The processor estimates a quality of a received signal that is transmitted from a source device. The processor determines a communication parameter for a next communication transaction based on an evaluation value that indicates a result of subtracting a second value from a first value, the first value being determined based on a coding rate and a data length of a data signal received from the source device, the second value being determined based on the data length, a modulation scheme and a quality of the data signal. The processor reports the communication parameter to the source device.

Abstract: A wireless communication device includes a processor. The processor estimates a quality of a received signal that is transmitted from a source device. The processor determines a communication parameter for a next communication transaction based on an evaluation value that indicates a result of subtracting a second value from a first value, the first value being determined based on a coding rate and a data length of a data signal received from the source device, the second value being determined based on the data length, a modulation scheme and a quality of the data signal. The processor reports the communication parameter to the source device.

Abstract: A peak suppression device includes a suppression-signal generating unit and a band pass filter (BPF). The suppression-signal generating unit generates a suppression signal that is obtained by adding, to a transmission signal, a frequency component in which components of frequencies from a boundary of a band of the transmission signal to a frequency that is away therefrom toward an out-band of the transmission signal by predetermined frequencies are attenuated, out of frequency components of a signal to suppress a peak of the transmission signal. The BPF attenuates, after the suppression signal is amplified by the amplifier, a frequency component outside the band of the transmission signal in the amplified suppression signal.

Abstract: A peak suppression device includes a suppression-signal generating unit and a band pass filter (BPF). The suppression-signal generating unit generates a suppression signal that is obtained by adding, to a transmission signal, a frequency component in which components of frequencies from a boundary of a band of the transmission signal to a frequency that is away therefrom toward an out-band of the transmission signal by predetermined frequencies are attenuated, out of frequency components of a signal to suppress a peak of the transmission signal. The BPF attenuates, after the suppression signal is amplified by the amplifier, a frequency component outside the band of the transmission signal in the amplified suppression signal.

Abstract: An object of the present invention is to provide the compression device and the expansion device of a complex digital signal, which further raise the compression ratio of the compression digital signal. The compression device of the present invention comprises: first section that acquires a first phase and a second phase, wherein with a complex digital signal being inputted into the complex digital signal compression device, the first phase is a phase, in polar coordinates, which the complex digital signal has, and it is assumed that the complex digital signal inputted into the complex digital signal compression device is expressed as a sum of two complex digital signals with an equal amplitude, phases of which are centered at the first phase and are shifted by a phase that equals to the second phase in the positive and negative direction respectively; and second section that compresses the first phase and the second phase respectively by performing quantization.

Abstract: An object of the present invention is to provide the compression device and the expansion device of a complex digital signal, which further raise the compression ratio of the compression digital signal. The compression device of the present invention comprises: first section that acquires a first phase and a second phase, wherein with a complex digital signal being inputted into the complex digital signal compression device, the first phase is a phase, in polar coordinates, which the complex digital signal has, and it is assumed that the complex digital signal inputted into the complex digital signal compression device is expressed as a sum of two complex digital signals with an equal amplitude, phases of which are centered at the first phase and are shifted by a phase that equals to the second phase in the positive and negative direction respectively; and second section that compresses the first phase and the second phase respectively by performing quantization.

Abstract: An apparatus includes a selection unit that selects an estimation target path to be used to estimate a propagation channel estimation value, among a plurality of paths based on a characteristic value of each path; a determination unit that determines an estimated reception time at which a signal as a target of estimation of the propagation channel estimation value among signals propagating through the estimation target path is received; an estimation unit that estimates an amplitude and a phase of the signal propagating through the estimation target path at the estimated reception time as a propagation channel estimation value of the estimation target path; and a processing unit that performs an interpolation/extrapolation process using the propagation channel estimation value of the estimation target path to estimate the propagation channel estimation value at a time other than the estimated reception time of the signal propagating through the estimation target path.

Abstract: An apparatus includes a selection unit that selects an estimation target path to be used to estimate a propagation channel estimation value, among a plurality of paths based on a characteristic value of each path; a determination unit that determines an estimated reception time at which a signal as a target of estimation of the propagation channel estimation value among signals propagating through the estimation target path is received; an estimation unit that estimates an amplitude and a phase of the signal propagating through the estimation target path at the estimated reception time as a propagation channel estimation value of the estimation target path; and a processing unit that performs an interpolation/extrapolation process using the propagation channel estimation value of the estimation target path to estimate the propagation channel estimation value at a time other than the estimated reception time of the signal propagating through the estimation target path.

Abstract: An apparatus for estimating phase/amplitude characteristics of a propagation path. The apparatus removes, from a receive signal on a data channel on which known information is transmitted upon being time-multiplexed between items of unknown information, transmit information on this channel, which provides phase/amplitude information indicative of phase/amplitude characteristics that this data channel has suffered over the propagation path. The apparatus further removes from a receive signal on a data channel on which only unknown information is transmitted, transmit information on this channel, which provides phase/amplitude information indicative of phase/amplitude characteristics that this data channel has suffered over the propagation path. The apparatus includes an adder for adding the two phase/amplitude information and an estimation unit for estimating, from an adder output, a phase characteristic and an amplitude characteristic that each channel has suffered over the propagation path.

Abstract: In a mobile communication receiving apparatus in which signals received on a plurality of receiving paths (branches) are combined by a combiner, correlation between noise signals contained in the signals received on respective ones of the branches is detected by a noise correlation calculating unit, and control is exercised so as to maximize signal-to-noise power ratio of the combined signal based upon the correlation calculated in the noise correlation calculating unit. Signal-to-noise power ratio can be maximized even if noise components contained in respective ones of the branch signals are mutually correlated.

Abstract: An apparatus for estimating phase/amplitude characteristics of a propagation path. The apparatus removes, from a receive signal on a data channel on which known information is transmitted upon being time-multiplexed between items of unknown information, transmit information on this channel, which provides phase/amplitude information indicative of phase/amplitude characteristics that this data channel has suffered over the propagation path. The apparatus further removes from a receive signal on a data channel on which only unknown information is transmitted, transmit information on this channel, which provides phase/amplitude information indicative of phase/amplitude characteristics that this data channel has suffered over the propagation path. The apparatus includes an adder for adding the two phase/amplitude information and an estimation unit for estimating, from an adder output, a phase characteristic and an amplitude characteristic that each channel has suffered over the propagation path.

Abstract: In a mobile communication receiving apparatus in which signals received on a plurality of receiving paths (branches) are combined by a combiner, correlation between noise signals contained in the signals received on respective ones of the branches is detected by a noise correlation calculating unit, and control is exercised so as to maximize signal-to-noise power ratio of the combined signal based upon the correlation calculated in the noise correlation calculating unit. Signal-to-noise power ratio can be maximized even if noise components contained in respective ones of the branch signals are mutually correlated.

Abstract: The characteristics of a radio channel is estimated over which pilot signals are transmitted consecutively together with TPC signals in the cdma2000 system. From the pilot signals demodulated into baseband signals, obtained are correlated values of a field of the pilot signals preceding the TPC field and of the TPC signals with the spread spectrum codes. Both of the correlated values are operated to determine data represented by the TPC signals. The data thus determined are removed from the TPC signals to restore the pilot signals which would have appeared unless multiplied with the spread spectrum codes in the TPC bit field. The characteristics of the radio channel are estimated from the pilot signals including the TPC bit field from which the data determined have been removed.

Abstract: A method for measuring characteristics of a propagated radio-wave on the basis of a reference signal, wherein the reference signal is obtained by receiving and demodulating the propagated radio-wave, comprising the steps of: estimating characteristics of a propagation-path, through which the radio-wave has been transmitted, on the basis of the reference signal; determining a desired-signal power and an interference-signal power of the propagated radio-wave on the basis of the estimated characteristics: and deriving an SIR by performing calculations on the desired-signal power and the interference-signal power.

Abstract: A received power preset value is varied in such a manner that SIR measured at the base station comes to coincide with the target value SIRt. By varying the received power preset value, a cell zone of the base station varies so that the number of mobile stations connected with the base station increases or decreases thereby SIR at each base station approximating with each other. As a result, deviation of communication quality is restricted so that efficiency of the system can be improved.