Abstract: A wireless communication apparatus having a plurality of antennas 11-1 to 11-M and for diversity-combining signals received by the antennas 11-1 to 11-M, includes a first combining unit (23, 24) for combining received power of the antennas 11-1 to 11-M based on a first algorithm; a second combining unit (21-1 to 21-M, 22, 23) for combining received power of the antennas 11-1 to 11-M based on a second algorithm, which is different from the first algorithm; a determination unit 15 for determining whether there is a delayed wave based on the received signals; and a control unit 16 for selecting either one of the first combining unit (23, 24) and the second combining unit (21-1 to 21-M, 22, 23) depending on a determination result by the determination unit 15 and controlling a selected combining unit to combine received power of the antennas 11-1 to 11-M.

Abstract: A radio base station 100 judges a receiving state of a radio signal in conformity with the orthogonal frequency division multiplexing scheme, and changes a symbol string configuration of a symbol string defined by a size in a frequency axis direction and in a time axis direction, on the basis of the judged receiving state.

Abstract: An interface unit for processing a first signal and a second signal, the second signal set to different transmission rate from the first signal and/or a different signal type from the first signal, including a plurality of interface panels, each of the plurality of interface panels including: a storage device which stores a first logic circuit data corresponding to the first signal and a second logic circuit data corresponding to the second signal, a configuration function unit which controls to select the first logic circuit data or the second logic circuit data, and a programmable logic circuit which reconfigures the first logic circuit data or the second logic circuit data based on a selection by the configuration function unit.

Abstract: In a transmission apparatus of a Gigabit Ethernet signal, in order to improve line efficiency, time division multiplexing is used. Further, if it is possible to branch/insert plural multiplexed Gigabit Ethernet signals at arbitrary nodes, it is possible to construct a more flexible network. For this reason, importance of a time division multiplexing apparatus having a function of branching/inserting Gigabit Ethernet signals is growing. A Gigabit Ethernet signal is monitored at the previous and subsequent stages of a cross connect unit, IFGs are inserted to the signal and switching is waited. If a signal state at the cross connection unit is an IFG, transmission path switching is performed, thereby performing transmission path switching without instantaneous interruption.

Abstract: A radio base station (100) is provided with a stream determination unit (141) for determining whether communication quality of a radio communication channel between the radio base station (100) and a receiving device is lower than a predetermined threshold, and an antenna selector (142) for selecting, from among transmitting antennas (131-134), transmitting antennas such that the distance between the transmitting antennas (131-134) becomes shorter than that before the communication quality is determined to be lower than the predetermined threshold when the communication quality is determined to be lower than the predetermined threshold.

Abstract: A wireless communication apparatus having a plurality of antennas 11-1 to 11-M and for diversity-combining signals received by the antennas 11-1 to 11-M, includes a first combining unit (23, 24) for combining received power of the antennas 11-1 to 11-M based on a first algorithm; a second combining unit (21-1 to 21-M, 22, 23) for combining received power of the antennas 11-1 to 11-M based on a second algorithm, which is different from the first algorithm; a determination unit 15 for determining whether there is a delayed wave based on the received signals; and a control unit 16 for selecting either one of the first combining unit (23, 24) and the second combining unit (21-1 to 21-M, 22, 23) depending on a determination result by the determination unit 15 and controlling a selected combining unit to combine received power of the antennas 11-1 to 11-M.

Abstract: A wireless communication apparatus, having a plurality of antennas 11-1 to 11-M and for diversity-combining signals received by the plurality of antennas 11-1 to 11-M, is provided with a combining information calculation unit 14 for calculating antenna combined amplitude and combining weights based on received power of the plurality of antennas 11-1 to 11-M, a combining unit 15 for weighting and combining the signals received by the plurality of antennas 11-1 to 11-M based on the combining weights calculated, and a decoding processing unit 16 for decoding a combined reception signal generated by the combining unit 15. It thereby improves fading durability of the decoding process by reducing influence of multipath fading caused by arrival waves with delays, even in a case of using only a small number of reception antennas, and maintains a stable reception condition consistently, as well as achieving downsizing of and reduction in cost of hardware.

Abstract: A unit timing signal synchronized with a high-order transmission frame is used for measuring a difference between the number of data pieces of a client signal mapped to the high-frequency frame and the number of data pieces of the output client signal by integrating the difference therebetween for each unit timing signal. Then stuffing and de-stuffing operations are performed so that a integration result is zero.

Abstract: A wireless communication apparatus having a plurality of antennas 11-1 to 11-M, and for diversity-combining signals received by the antennas 11-1 to 11-M and performing communication with switching a modulation scheme according to a radio condition, includes a first combining unit (23, 24) for combining received power of the antennas 11-1 to 11-M based on a first algorithm; a second combining unit (21-1 to 21-M, 22, 23) for combining received power of the antennas 11-1 to 11-M based on a second algorithm different from the first algorithm; and a control unit 15 for selecting either one of the first combining unit (23, 24) and the second combining unit (21-1 to 21-M, 22, 23) depending on the modulation scheme and controlling a selected combining unit to combine received power of the antennas 11-1 to 11-M.

Abstract: In a transmission apparatus of a Gigabit Ethernet signal, in order to improve line efficiency, time division multiplexing is used. Further, if it is possible to branch/insert plural multiplexed Gigabit Ethernet signals at arbitrary nodes, it is possible to construct a more flexible network. For this reason, importance of a time division multiplexing apparatus having a function of branching/inserting Gigabit Ethernet signals is growing. A Gigabit Ethernet signal is monitored at the previous and subsequent stages of a cross connect unit, IFGs are inserted to the signal and switching is waited. If a signal state at the cross connection unit is an IFG, transmission path switching is performed, thereby performing transmission path switching without instantaneous interruption.

Abstract: Optical signal transmission is improved by reducing the variance in light output level and OSNR by adjusting optical signal intensity and gain tilt, taking SRS influence into consideration.

Abstract: A unit timing signal synchronized with a high-order transmission frame is used for measuring a difference between the number of data pieces of a client signal mapped to the high-frequency frame and the number of data pieces of the output client signal by integrating the difference therebetween for each unit timing signal. Then stuffing and de-stuffing operations are performed so that a integration result is zero.

Abstract: Optical signal transmission is improved by reducing the variance in light output level and OSNR by adjusting optical signal intensity and gain tilt, taking SRS influence into consideration.

Abstract: Optical signal transmission is improved by reducing the variance in light output level and OSNR by adjusting optical signal intensity and gain tilt, taking SRS influence into consideration.

Abstract: There is suppressed deterioration of transmission quality resulting from FWM light generated in the optical fiber of an optical transmission apparatus that performs wavelength division multiplex transmission. To suppress deterioration of the transmission quality due to the FWM light, the sender apparatus adjusts the intensity of wavelength-division-multiplexed light output to the optical fiber, according to a level of FWM crosstalk observed by receiver apparatus.

Abstract: a mode change switch 3 which changes an automatic shift mode and a manual mode, an up-shift switch 4, and a down-shift switch 5 are provided. The mode change switch 3 outputs an output of the normal-open contact point P2 as a manual mode signal to a controller 1 in operating the manual change switch 3, while an output of the normal-closed contact point P4 is outputted to an input side of the up-shift switch 4 at non-operation thereof. The up-shift switch 4 and the down-shift switch 5 are provided with the normal-open contact points P12, P22 which output an up-shift signal commanding an up-shift or a down-shift signal commanding a down-shift in operating the switch, and the normal-closed contact points P14, P24 which output a monitor signal at non-operation thereof.

Abstract: There is suppressed deterioration of transmission quality resulting from FWM light generated in the optical fiber of an optical transmission apparatus that performs wavelength division multiplex transmission. To suppress deterioration of the transmission quality due to the FWM light the sender apparatus adjusts the intensity of wavelength-division-multiplexed light output to the optical fiber according to a level of FWM crosstalk observed by receiver apparatus.

Abstract: There is suppressed deterioration of transmission quality resulting from FWM light generated in the optical fiber of an optical transmission apparatus that performs wavelength division multiplex transmission. To suppress deterioration of the transmission quality due to the FWM light, the sender apparatus adjusts the intensity of wavelength-division-multiplexed light output to the optical fiber, according to a level of FWM crosstalk observed by receiver apparatus.

Abstract: a mode change switch 3 which changes an automatic shift mode and a manual mode, an up-shift switch 4, and a down-shift switch 5 are provided. The mode change switch 3 outputs an output of the normal-open contact point P2 as a manual mode signal to a controller 1 in operating the manual change switch 3, while an output of the normal-closed contact point P4 is outputted to an input side of the up-shift switch 4 at non-operation thereof. The up-shift switch 4 and the down-shift switch 5 are provided with the normal-open contact points P12, P22 which output an up-shift signal commanding an up-shift or a down-shift signal commanding a down-shift in operating the switch, and the normal-closed contact points P14, P24 which output a monitor signal at non-operation thereof.

Abstract: There is suppressed deterioration of transmission quality resulting from FWM generated in the optical fiber of an optical transmission apparatus which performs wavelength division multiplex transmission. A wavelength division multiplexing optical transmission system is not restricted by a wavelength division multiplex density. Intensity of FWM generated in an optical fiber transmission line for each span is observed by a receiver side to determine intensity of output light to send the span by a sender side, to thereby suppress deterioration of the transmission quality due to the FWM generated in the optical fiber of a WDM optical transmission apparatus.