Abstract: A receiving station used in a wireless communication system receives information from one or more transmitting stations. The receiving station comprises a receiving unit (112) configured to receive information containing ID information of a transmitting station, and a data extracting unit (1011) configured to extract the ID information from the received information. Transmit timing sequence acquiring means (2012, 2013 and 2014) of the receiving station estimates a transmit timing sequence (Hs) of the transmitting station based on the extracted ID information. Synchronizing means (2014) of the receiving station brings the receive timing of the receiving station in synchronization with transmit timing of the transmitting station based on the transmit timing sequence.

Abstract: A mobile communication system includes a line control station, and a plurality of base stations belonging to a plurality of clusters so that each of the clusters includes a plurality of base stations. Each of the clusters includes a cluster control station which is connected to the line control station via a line and controls the base stations within the cluster to which the cluster control station belongs. In addition, each of the base stations within one cluster is connected to other base stations within the one cluster and/or the cluster control station within the one cluster via lines, so that each of the base stations within the one cluster is directly or indirectly connected to the cluster control station within the one cluster.

Abstract: An object of the present invention is to enable appropriate switching among a plurality of modes including a cellular communication mode and an RFID information receiving function. A communication system is comprised of an RFID configured to transmit predetermined ID information of its own, a server capable of being connected to a cellular communication network, and an aggregation point for aggregating information from the RFID. In the communication system, the aggregation point, which is comprised of a mobile communication terminal or the like, is provided with an ID receiver for receiving ID information from an RFID, and a cellular communication part for performing cellular communication via the cellular communication network.

Abstract: A mobile terminal comprises a transmitter/receiver configured to transmit/receive a signal to/from a base station, a communication state determination unit configured to determine a communication state of the transmitter/receiver, a movement state measurement unit configured to measure a movement state of the mobile terminal, and a reception period controller configured to control a reception period for receiving a control signal transmitted from the base station by the transmitter/receiver, based on a communication state determination result determined by the communication state determination unit and a movement state measurement result measured by the movement state measurement unit.

Abstract: In an adaptive equalizing apparatus for MIMO (Multi-Input Multi-Output) turbo reception, an interference component in a received signal is subtracted therefrom using a replica of an interference component in an interference canceling part 31n, the subtracted output is filtered by a filter 32n, to cancel the remaining interference component and to perform multi-path combining, and in a degree-of-interference-cancellation estimation part 41n the degree of interference cancellation &bgr;(i) is set such that it is 0 for the iteration number i=1, 0.8+0.05 (i−1) for 5≧i≧2 and 1 for i≧6, and at the beginning of each iteration filter coefficients are calculated using &bgr;(i) and a channel estimation value in a filter coefficient calculating part 33n and the filter coefficient thus calculated are set in the filter 32n. An average value of soft decision symbol estimation values used in the interference canceling part may be used as &bgr;.

Abstract: A locating system for determining a position of an object comprises a transmitting station that transmits a first ID signal containing a first identifier of this transmitting station; a receiving station that receives the first ID signal, measures the intensity of the first ID signal, and extracts the first identifier; a data management unit that stores and manages the intensity in association with the first identifier, the intensity and the identifier being supplied from the receiving station; and a positioning computer that estimates the position of the transmitting station using a first correcting formula defining a relation between the intensity and the distance, based on the data stored in the data management unit.

Abstract: Data of an input data series is written into a first interleaver. The data is read out column by column or row by row from the first interleaver and written into a plurality of second interleavers column by column or row by row. The data is read from each of the second interleavers and written into one or a plurality of third interleavers as necessary. The operation is repeated once or a plurality of times, thereby reading the data from each of the interleavers and generating a data series. Interleaving is carried out by generating interleaving patterns with a plurality of interleaving patterns. Further, an interleaving pattern suitable for turbo encoding or transmission is generated.

Abstract: The accuracy of an equalization start timing, an equalization duration and a channel estimation is improved in an application including an increased number of users. An equalization start timing t0, an equalization duration te and channel H estimation are performed for each user signal, and using these, received signal replicas Re1 ro ReN for the respective users are generated. The replicas are subtracted from the received signal to provide an error signal, and Re1 to ReN are added to Es to provide an interference suppressed received signals for the users 1 to N. to, te, H and Re1 to ReN are generated from these to generate Es in a repeated fashion to improve the accuracy of t0, te and H.

Abstract: An interleaving method including the step of (1) receiving a data sequence having a plurality of blocks, each having a length based on a prime number P; (2) generating sequence permutation data by performing a given operation on elements of a Galois field of a characteristic P; (3) permuting results of the given operation, so that sequence permutation data are generated; and (4) permuting a sequence of data of the data sequence in accordance with the sequence permutation data.

Abstract: In a method and an apparatus of transmitting a burst signal when the burst signal is transmitted from a transmitting station to a receiving station at a transmission power value and/or a transmission rate determined in accordance with a state of a radio channel between the transmitting and receiving station in a mobile communication system, based on a comparison result between a criterion predetermined according to a state of the radio channel and/or a transmission waiting state of the signal, whether or not the burst signal is to be transmitted is determined, and, when it is determined that the burst signal is to be transmitted, the burst signal is transmitted from the transmitting station to the receiving station.

Abstract: In a multicast transmission system in which the same information is transmitted from a base station to a plurality of mobile stations, the mobile station sends a retransmission request signal to the base station when detecting an error in a received multicast signal.

Abstract: In a wireless communication system formed by a plurality of access points constituting a wireless network, through which user terminals make accesses, and at least one control station configured to control the access points, public access points are systematically set up by a manager of the control station, while user's personal access points to be freely set up by users at desired locations according to needs of users are accommodated by operating the control station to measure a utilization level of each user's personal access point and charge an owner of each user's personal access point according to a measured utilization level and set up relay routes using the public access points and the user's personal access points.

Abstract: Each radio station can manage a plurality of channels, and functions both as a master station which controls transmission in each channel and a slave station which operates under control of a master station. In case of a master station, it transmits a signal under control of the own station, and in case of a slave station, it transmits a signal under control of the master station. Each radio station can communicate with any other radio station either directly or through another radio station. In each channel, communication is carried out in time division of centralized control access phase and distributed control access phase. A master station in case of centralized control access phase is determined in each channel and in each link.

Abstract: A central control station, which controls radio base stations connected thereto via radio links and optical fiber links, includes a demultiplexing unit which demultiplexes signals supplied from an upper-level station, signal conversion units which convert the respective demultiplexed signals into converted signals having a unified transmission format, and a distribution unit which distributes the converted signals to the radio links and the optical fiber links.

Abstract: In a transmission power control method of the present invention, a value of a received signal quality parameter of a received multicast signal is measured. A parameter signal, indicating the received signal quality parameter value, is transmitted from a plurality of mobile stations to a base station through a radio link. The parameter signals from the mobile stations are received at the base station through the radio link. A power control value of each of the mobile stations is determined based on the received signal quality parameter values of the received parameter signals. The transmission power of the multicast signal, sent to each of the mobile stations, is controlled based on the determined power control value.

Abstract: A received-signal combining method of transmitting a signal, based on a signal having undergone error-correction coding and transmitted from a radio-transmitting station, to a receiving station from a plurality of radio-receiving stations, and generating a reception-information sequence based on the thus-transmitted signal by the receiving station, comprises the steps of: each radio-receiving station rendering error-correction decoding and error detection processing on the signal transmitted from the radio-transmitting station, and transmitting the error-correction-decoding result to the receiving station when no error is detected by the error detection processing; and the receiving station combining the received error-correction-decoding result according to a first algorithm when receiving the error-correction-decoding result from any radio-receiving station, and, thus, generating the reception-information sequence.

Abstract: The present invention relates to an echo canceler for training an echo path estimation without providing a hindrance to a speech. The echo canceler of the present invention includes a pseudo noise generator for generating a certain pseudo noise. This pseudo noise is forcibly supplied to a transmission line for transmitting a far-end talker's voice. Here, in the case where the far-end talker's transmitting speech level is faint or the far-end talker is in a speechless condition, a certain correlation is established between the pseudo noise and a signal of the transmission line for transmitting the near-end talker's voice. Based on such a correlation as just mentioned, a coefficient for generating an echo replica is calculated. Therefore, a training for estimating an echo path is performed based on the pseudo noise and without depending on the far-end talker's voice, thereby enabling to generate an appropriate echo replica.

Abstract: An excitation vector of the previous frame stored in an adaptive codebook is cut out with a selected pitch period. The excitation vector thus cut out is repeated until one frame is formed, by which a periodic component codevector is generated. An optimum pitch period is searched for so that distortion of a reconstructed speech obtained by exciting a linear predictive synthesis filter with the periodic component codevector is minimized. Thereafter, a random codevector selected from a random codebook is cut out with the optimum pitch period and is repeated until one frame is formed, by which a repetitious random codevector is generated. The random codebook is searched for a random codevector which minimizes the distortion of the reconstructed speech which is provided by exciting the synthesis filter with the repetitious random codevector.

Abstract: A speech transmission method utilizes a speech frame length having a time period within which a speech waveform remains substantially steady-state, and the speech frame length is selected to be 1/M the time period of one TDM or TDMA frame. For each speech frame, speech signal is coded, from which are selected M different speech codes including two speech codes that are spaced one or more speech frames apart, and the selected M speech codes are combined into composite codes. Each composite code is inserted in one time slot of each TDM or TDMA frame.