摘要:
A spatial multiplex base station (1000, 2000, 3000) estimates an optimal array parameter appropriate to a propagation environment of a received signal and changes the array parameter in an adaptive manner. The optimal value is estimated by referring to a table prepared in advance, by searching for the optimal value while executing an array process multiple times using different parameters, or by searching for the optimal value from the results of the previous frames. Consequently, a weight estimation sequential algorithm is executed based on the estimated array parameter. This enables realization of optimal signal reception in a radio receiving device, regardless of the propagation environment.
摘要:
In response to a connection request from a terminal, a base station transmits to the terminal a signal instructing a reception operation appropriate to the transmission operation of the base station. According to this instruction signal, the terminal selects and executes an optimal reception operation. Moreover, the terminal gives its reception operation information to the base station in advance. According to this reception operation information, the base station transmits a reception instruction operation to the terminal. These processes are realized by software using DSP (12, 14) or the like.
摘要:
An antireflection film composed of a layer of arsenic triselenide having an optical thickness in the range between 2.518 and 2.783 .mu.m, a layer of potassium chloride having an optical thickness in the range between 1.151 and 1.272 .mu.m and a layer of arsenic triselenide having an optical thickness in the range between 0.577 and 0.749 .mu.m which are successively formed on a member of infrared radiation transmitting material formed of a mixture of thalium iodide and thalium bromide. The member provided with the three-layer antireflection film is used in an atmosphere of protective gas, such as dry air or dry N.sub.2 gas.
摘要:
A scheduling executing section calculates a predicted value of a transmission gain at a time when controlling transmission directivity in a plurality of antennas based on a known signal to be received in a frequency band of a use downlink radio resource and performing downlink communication with a communication terminal, and determines a communication terminal to which the use downlink radio resource is allocated based on the predicted value.
摘要:
A communication level table storage unit stores a communication level table that defines correspondence between a communication level at least defined by MCS (modulation scheme and coding rate) and a range of required CINR at the communication level. A communication quality management unit obtains CINR of a received signal at another communication apparatus which is a communication partner. A setting unit refers to the communication level table, and when a difference between a representative value of a range of required CINR at a current communication level and a representative value of a range of required CINR of CINR at a communication level which is one level higher is more than or equal to a threshold value, sets a communication level such that the obtained CINR of the received signal is included in the range of required CINR.
摘要:
A wireless communication device communicates with, using a plurality of antennas, a communication partner device including a plurality of antennas. The wireless communication device includes a communication unit, an interference intensity judgment unit, and a determination unit. The communication unit communicates with the communication partner device using the plurality of antennas and is configured to use a MIMO (multiple input multiple output) scheme when transmitting a signal to the communication partner device. The interference intensity judgment unit judges, based on predetermined criteria, whether or not an intensity of an interference wave included in a received signal at the communication partner device is high. The determination unit prohibits, upon the interference intensity judgment unit judging that the intensity of the interference wave is high, the communication unit from using the MIMO scheme when transmitting a signal.
摘要:
A scheduling executing section calculates a predicted value of a transmission gain at a time when controlling transmission directivity in a plurality of antennas based on a known signal to be received in a frequency band of a use downlink radio resource and performing downlink communication with a communication terminal, and determines a communication terminal to which the use downlink radio resource is allocated based on the predicted value.
摘要:
When a determination is made that communication by an SM scheme is suitable, a setting unit performs switching from a communication level by an STC scheme to the communication level by the SM scheme, between the communication level at a first level of MCS by the space-time coding scheme and the communication level at a second level of MCS by the SM scheme. When a determination is made that communication by the SM scheme is unsuitable, the setting unit performs switching from the communication level by the STC scheme to the communication level by the spatial multiplexing scheme, between the communication level at a third level of MCS, which is higher than the first level, by the space-time coding scheme and a fourth level of the modulation scheme and the coding rate, which is higher than the second level, by the SM scheme.
摘要:
Upon receipt of sounding signals from a plurality of communication devices including a communication partner device, an evaluation value processing unit calculates an evaluation value indicative of a characteristic of a transmission path based on the sounding signals from the plurality of communication devices. A transmission scheme setting unit sets, based on the evaluation value, adaptive array transmission that achieves both null steering and beamforming or beamforming dedicated transmission as a transmission scheme to the communication partner device.
摘要:
A setting unit sets a communication mode for different one or more counterpart communication apparatuses to a non-spatial multiplexing mode or a spatial multiplexing mode. Setting unit switches the setting of the communication mode for the different one or more counterpart communication apparatuses from the non-spatial multiplexing mode to the spatial multiplexing mode, on the basis of a capability of a communication system having an own apparatus and the different one or more counterpart communication apparatuses. A transmitting unit processes a transmitting signal to the different one or more counterpart communication apparatuses to output the processed signal to a plurality of antennas, on the basis of the set communication mode.