Abstract: A received signal vector (X(t)) from an array antenna (#1 to #4) is subjected to frequency offset correction by a frequency offset correction part (6) and thereafter subjected to adaptive array processing. An error signal (e(t)) is referred to on the basis of an output signal (y(t)) from the adaptive array and a reference signal (d(t)) held in a memory (30) in a reference signal section or a replica signal (d?(t)) output from a forced phase-locking processing part (20) in a section having no reference signal, so that a frequency offset quantity (??) is extracted therefrom by an offset extraction part (100).

Abstract: A measuring unit inputs a detection received signal and measures a received RSSI value as the detection received signal. A first comparator inputs a plurality of received RSSI values measured by the measuring unit and compares them with a predetermined threshold value. A signal difference deriving unit derives a relative relationship among the plurality of RSSI values. A second comparator compares the relative relationship with a predetermined value. If the first comparator and the second comparator detect any malfunction, a decision unit receives notification accordingly from the first comparator and the second comparator and finally judges the malfunction of communication functions associated therewith.

Abstract: When the number of multiplexed connections of PSs to a CS is changed due to issuance of a connection request from other PS to the CS or the like, the CS selects a unique word pattern (new unique word) optimal for the new number of multiplexed connections, so as to request switching from an old unique word to a new unique word to each PS of the user who has established multiple access. When a response to the request for switching is received from the PS of each user, the CS transmits a synchronous burst signal including the new unique word to the PS, and the PS also returns the synchronous burst signal including the new unique word. Synchronization is thus established.

Abstract: An AGC processing portion receives a burst signal of each received frame, and measures its received power level to perform gain control of a variable gain amplifier. Unlike a conventional wireless receiving device, a digital signal from an A/D converter is directly supplied to the AGC processing portion, without passing through an FIR filter. Accordingly, the input timing for the AGC processing portion does not include a delay due to the FIR filter, and an amplitude value can be adjusted to be appropriate from the leading part of each frame, suppressing the occurrence of a reception error due to AGC processing.

Abstract: An RSSI detection unit detects a level of a received signal. An error detection unit performs error detection of the received signal. An error correction control unit causes an error correction unit to perform error correction of the received signal only when the error detection unit detects an error and the level of the received signal detected by the RSSI detection unit is not lower than a predetermined value.

Abstract: 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.

Abstract: 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.

Abstract: A base station transmits information in a downlink signal that identifies whether the base station is an adaptive array base station. If a terminal capable of performing diversity reception determines that a terminal to be connected is an adaptive array base station, it stops to perform diversity reception and set an antenna used for an uplink signal transmission to be used for an immediately following reception among a plurality of antennas (11, 12). Thus, a reception effectively utilizing transmission directivity from the adaptive array base station is attained, and interference wave can be reduced. These process are executed with software by DSP (18).

Abstract: On a signal received by an antenna (1, 2), an adaptive array processing is performed by a DSP to obtain an array output. A reception timing control unit (30). shifts sampling timing of a reception signal by an A/D converter (3, 4) while monitoring MSE between the array output and the reference signal, and determines an optimal sampling point (reception position) at which the sampling error is minimized.

Abstract: A radio base system (1000) is multi-path-connected to a plurality of mobile terminal devices to transmit/receive signals. When a communication channel establishment request is sent from one of the plurality of mobile terminal devices, a control unit (80) detects the presence or absence of a mobile terminal device to which a communication channel is already connected for each of a plurality of slots. When channel allocation has to be performed by path multiplexing on the mobile terminal device which has sent the channel establishment request, control unit (80) permits channel establishment in accordance with a result of detection of an error detecting unit (56).

Abstract: The radio base station system shifts and directly allocates the transmission timing for a new user from a normal transmission timing to an optimal transmission timing position within the slot to which a mobile terminal device of the new user is about to connect. Thus, it becomes unnecessary to narrow in advance the transmission timings for users already connected to the relevant slot.

Abstract: An adaptive array apparatus (100) that has a weight converge on an optimal value is provided. The adaptive array apparatus repeatedly adjusts the weight using predetermined calculations so as to minimize a difference between a desired signal and a combined signal which has been weighted with the weight. A parameter control unit (71) judges whether an adjusted weight is located closer to an optimal value than a reference value, and according to the judgment result, changes a step size which is used in the predetermined calculations performed by a reception weight calculating unit (72), to determine the extent to which the weight should be adjusted. With this construction, the adaptive array apparatus can increase convergence stability and speed in calculating a weight, and the weight converges on an optimal value.

Abstract: A wireless base station comprises a response vector calculation unit (561), an RSSI measuring unit (562), an MSE calculation unit (563), an FD calculation unit (564) and the like, and those units obtain an index showing communication quality of at least one of two mobile stations that are intended to be space-division multiplexed. According to the index, a control unit (80) judges the suitability of the two mobile stations for space-division multiplexing and performs space-division multiple access communication when judging suitable. The effect achieved with this construction is that the wireless base station maintains quality of communication between the wireless base station and mobile stations at a certain satisfactory level when performing space-division multiple access communication.

Abstract: A slot of a low multiplicity is processed to narrow transmission timing intervals for already-connected users and thereby to make preparation for a new user, and a slot of a high multiplicity is processed to keep the maximum transmission timing intervals for the already-connected users so that the preparation for the new user is not performed. As a result, it is possible to provide the slot prepared for the new user while maximizing the transmission timing intervals. Further, the transmission timing intervals for the already-connected users are kept as large as possible during the traffic channel for preventing the deterioration of characteristics, and the shifting of the transmission timing is performed for the new user during the control channel so that the optimum transmission timing intervals can be achieved when the traffic channel is established. A DSP (14) executes the processing.

Abstract: A received signal vector (X(t)) from an array antenna (#1 to #4) is subjected to frequency offset correction by a frequency offset correction part (6) and thereafter subjected to adaptive array processing. An error signal (e(t)) is referred to on the basis of an output signal (y(t)) from the adaptive array and a reference signal (d(t)) held in a memory (30) in a reference signal section or a replica signal (d′(t)) output from a forced phase-locking processing part (20) in a section having no reference signal, so that a frequency offset quantity (&Dgr;&thgr;) is extracted therefrom by an offset extraction part (100).

Abstract: In a radio base station (100) that communicates with a mobile station according to the PHS standards, a reception timing detection unit (55) measures the time when a UW signal of a signal separated by a signal regulating unit (51) for each mobile station is received with reference to the starting point of the time slot of a TDMA/TDD frame, as a reception timing signal. A control unit (80), when assigning a communication channel according to spatial multiplexing to a mobile station, allocates a communication channel in which a reception timing difference between the new mobile station and all mobile stations communicating is equal to or exceeds a threshold value.

Abstract: For each of a plurality of users having multiple connection to a specific time slot a synchronization window of a predetermined temporal length having a center corresponding to a synchronization position is set to disallow a subsequent signal reception outside the widow. Furthermore timings of transmission for users are controlled to prevent synchronization windows from overlapping or being too distant from each other in the time slot. Thus, synchronization positions can be prevented from approaching each other or having an inverted time relationship therebetween. This process is provided by a DSP in software.

Abstract: A discharge-pumped gas laser, typically a discharge-pumped excimer laser, includes a main discharge circuit for producing an electric discharge in a laser gas to excite the laser gas for laser emission. The main discharge circuit comprises a first electric circuit having a thyratron, a charging circuit including a charging capacitor for storing an electric energy to operate the thyratron, and a discharging circuit including a pair of main discharge electrodes and a peaking capacitor for storing an electric energy to cause a main discharge in the laser gas between the main discharge electrodes. The laser gas is preionized by preionizers having a plurality of preionizing electrodes which produce an electric discharge to preionize the laser gas.

Abstract: A discharge-pumped gas laser has a pressure container filled with a laser gas under pressure and a pair of elongate main discharge electrodes. The main discharge electrodes are disposed in the pressure container in confronting relationship to each other for producing an electric discharge in the laser gas in a main discharge region defined therebetween to excite the laser gas for laser emission. The laser gas is circulated to flow through the main discharge region in a direction perpendicular to the main discharge electrodes. The laser gas in the main discharge region is preionized by an UV preionizer disposed either upstream or downstream of the main discharge region with respect to the direction of flow of the laser beam. The pressure container houses a baffle partition for controlling the laser gas to flow past one of the main discharge electrodes and the preionizer while blocking the laser gas from directly flowing to the other of the main discharge electrodes and the preionizer.

Abstract: An exposure system includes a pulse light source emitting light in response to a trigger signal and giving a predetermined exposure light quantity by a plurality of times of light emission. A reticle has an alignment mark and a light exposure pattern. A projection lens contractedly projects the pattern of the reticle. A wafer has an alignment mark to be located. The wafer is exposed to a projection of the pattern. A wafer stage is movable and carries the wafer. A laser interferometer measures a position of the wafer stage. An alignment device serves to detect a condition of an alignment of the wafer with respect to the reticle in an exposure position.