Abstract: A base-station control apparatus includes: a number-of-training-packets determining circuit that determines the number of training packets to be transmitted by a wireless terminal, based on the number of first directional beam patterns used by a first base-station apparatus connected to the wireless terminal and the number of second directional beam patterns used by at least one second base-station apparatus not connected to the wireless terminal; and a notification issuing circuit that issues a notification indicating the determined number of training packets to the first base-station apparatus.

Abstract: Provided is a content delivery system in which a content delivery server delivers content to a content delivery client. The content delivery client transmits content using first wireless communication, detects the area of second wireless communication, and if it determines that sufficient free space is not present in a first storage thereof, transmits a part of data stored in the first storage to the content delivery server using the second wireless communication. The content delivery server makes free space in the first storage by temporarily storing the data in a second storage thereof and then delivers content using the second wireless communication on the basis of the control information.

Abstract: A location estimation system for estimating a location of a wireless communication terminal, the location estimation system including first to M-th wireless communication devices and a control device, wherein i-th wireless communication device includes communication circuitry, which in operation, receives a signal transmitted from the wireless communication terminal using beams in Ni directions, and control circuitry, which in operation, calculates Ni reception qualities corresponding to the beams in the Ni directions, respectively, and wherein the control device includes control circuitry, which in operation, estimates i-th arrival direction of the signal received by the i-th wireless communication device by comparing the Ni reception qualities with the radiation angle characteristics of the beams in the Ni directions, and estimates the location of the wireless communication terminal based on the first to the M-th arrival directions estimated and locations of the first to the M-th wireless communication devi

Abstract: Provided is a content delivery system in which a content delivery server delivers content to a content delivery client. The content delivery client transmits content using first wireless communication, detects the area of second wireless communication, and if it determines that sufficient free space is not present in a first storage thereof, transmits a part of data stored in the first storage to the content delivery server using the second wireless communication. The content delivery server makes free space in the first storage by temporarily storing the data in a second storage thereof and then delivers content using the second wireless communication on the basis of the control information.

Abstract: A wireless communication apparatus including an antenna, which, in operation, changes a beam pattern by using a plurality of antenna elements, a communicator, which, in operation, performs wireless communication with a communication terminal by using the antenna, quality information acquisition circuitry, which, in operation, acquires quality information indicating a communication quality of the wireless communication, movement information acquisition circuitry, which, in operation, acquires movement information indicating movement of a relative position of the communication terminal with respect to the antenna, and beam control circuitry, which, in operation, controls the beam pattern to be changed by the antenna on the basis of the acquired quality information and movement information.

Abstract: A wireless communication apparatus including an antenna, which, in operation, changes a beam pattern by using a plurality of antenna elements, a communicator, which, in operation, performs wireless communication with a communication terminal by using the antenna, quality information acquisition circuitry, which, in operation, acquires quality information indicating a communication quality of the wireless communication, movement information acquisition circuitry, which, in operation, acquires movement information indicating movement of a relative position of the communication terminal with respect to the antenna, and beam control circuitry, which, in operation, controls the beam pattern to be changed by the antenna on the basis of the acquired quality information and movement information.

Abstract: When switching the mode of a power amplifier between compressed mode and uncompressed mode, accurate transmission power control is realized. A transmission power control method includes setting a power setting value of mode to switch to, such that an inter-mode output power error is canceled (equal to step ST21), calculating an intra-mode output power error from the power setting value of the mode to switch to (equal to step ST23), calculating a gain linearity value based on the power setting value of the mode to switch to and an output power error of the intra-mode (equal to step ST24), and resetting the power setting value of the mode to switch to based on the gain linearity value (equal to steps ST25 and 26).

Abstract: A receiving apparatus converges a gain to a target gain even when a fish bone effect signal is included having a low power period in which signal power decreases abruptly compared to average signal power. The receiving apparatus (100) receives a signal including the fish bone effect signal having the low power period (FBE signal period) in which signal power decreases abruptly compared to average signal power. A FBE detecting section (133) detects an FBE signal period of a low power period based on a gain error corresponding to a difference between target power and average signal power of the received signal of the adjusted gain. Further, the gain error correcting section (134) selects a lower value than 1 as a convergence coefficient in the FBE signal period of a low power period, multiplies the gain error with the selected convergence coefficient and corrects the gain error.

Abstract: A transmitter includes: a decoder for transforming an IQ signal into a linear sum of two vectors which have non-negative coefficients, respectively, which form an angle of (?/4), and which are included in eight vectors representing directions indicated by eight angles of (??/2), 0, (?/2), ?, (?3?/4), (??/4), (?/4), and (3?/4), respectively, and for outputting information upon magnitudes and angles of the two vectors; a phase generator for generating eight phase signals corresponding to phases of (??/2), 0, (?/2), ?, (?3?/4), (??/4), (?/4), and (3?/4), respectively, and outputting the eight phase signals; and a selector for selecting two phase signals having phases equivalent to angles of the two vectors, from among the eight phase signals, and amplifying the two phase signals having been selected, based on the information upon the magnitudes and the angles, and outputting, as a plurality of amplification signals, the two phase signals having been amplified.

Abstract: A multimode wireless communication apparatus that supports plural wireless communication systems and switches wireless communication systems to communicate. The apparatus includes a signal processor capable of switching wireless communication systems by plural manners; and a controller that directs to the signal processor a combination of manners of switching wireless communication systems according to a communication environment. The signal processor switches wireless communication systems according to the combination of manners of switching wireless communication systems directed from the controller.

Abstract: When switching the mode of a power amplifier between a compressed mode and an uncompressed mode, an accurate transmission power control is realized. A transmission power control method includes calculating an intra-mode output power error from a power setting value in a mode before switching as a comparison standard value error (equal to step ST32), setting a power setting value of a mode to switch to, such that an inter-mode output power error is canceled (equal to step ST33), calculating an intra-mode output power error from a power setting value of a mode to switch to (equal to step ST35), calculating a gain linearity value based on a power setting value of a mode to switch to and the intra-mode output power error (equal to step ST36), and resetting the power setting value of the mode to switch to, that cancels the comparison standard value error in the mode before switching and the output power error in the mode to switch to, based on the gain linearity value (equal to steps ST37 and 38).

Abstract: A transmitter includes: a decoder for transforming an IQ signal into a linear sum of two vectors which have non-negative coefficients, respectively, which form an angle of (?/4), and which are included in eight vectors representing directions indicated by eight angles of (??/2), 0, (?/2), ?, (?3?/4), (??/4), (?/4), and (3?/4), respectively, and for outputting information upon magnitudes and angles of the two vectors; a phase generator for generating eight phase signals corresponding to phases of (??/2), 0, (?/2), ?, (?3?/4), (??/4), (?/4), and (3?/4), respectively, and outputting the eight phase signals; and a selector for selecting two phase signals having phases equivalent to angles of the two vectors, from among the eight phase signals, and amplifying the two phase signals having been selected, based on the information upon the magnitudes and the angles, and outputting, as a plurality of amplification signals, the two phase signals having been amplified.

Abstract: An object of the invention is to provide a multimode polar modulation device and a multimode radio communication method for making it possible to decrease the distortion compensation processing data capacity while maintaining the distortion compensation accuracy and also making it possible to efficiently store the distortion compensation processing data corresponding to a multimode modulation signal adaptively acquired in memory. At the distortion compensation coefficient calibration operation time of a polar modulation circuit 1901, a control section 1903 selects a modulation signal with a narrower dynamic range of amplitude signal than at the transmission operation time, an adaptive operation control section 1711 measures a spectrum in output of a power amplifier 1 for each predetermined output level, and a distortion compensation processing circuit 1701 finds optimum coefficient information.

Abstract: A digital filter is provided for radio communication processing capable of dynamically modifying the characteristic and simultaneously processing a plurality of systems. In the digital filter, calculation core groups capable of modifying function are arranged and connected to one another by an input interface unit and an output interface unit. When the communication mode is modified, the number of calculation resources to be used and setting contents are decided according to the setting candidate of the filter characteristic required and the calculation resource empty state.

Abstract: A wireless communication apparatus and a communication control method wherein even if there occurs a change in communication control information due to a function change, an appropriate correction is implemented to improve the communication quality. A wireless communication apparatus (100) comprises a plurality of reconfigurable function parts (reconfigurable function modules (1031)) that reconfigure functions related to communication to perform digital signal processings according to a plurality of communication formats; and a communication operation control function part that controls the communication operation. Each of the reconfigurable function parts includes a property register (10311) in which the communication control information is written.

Abstract: By compensating for a detection result of the detector in feedback control of output power of the power amplifier, the polar modulation transmission apparatus is able to realize accurate transmission power control. Polar modulation transmission apparatus 100 has detector 106 that detects output power of power amplifier 103, PAPR calculating section 131 that calculates the PAPR of the spread modulated signal, compensation value generating section 134 that outputs a compensation value corresponding to the calculated PAPR and an arithmetic operator that performs an arithmetic operation using the compensation value and a detection result obtained by detector 106. By this means, it is possible to compensate for the sensitivity of detector 106 (measurement sensitivity) that changes depending on the ? parameter and mode and make the sensitivity of detector 106 (measurement sensitivity) virtually constant.

Abstract: When switching the mode of a power amplifier between a compressed mode and an uncompressed mode, an accurate transmission power control is realized. A transmission power control method includes calculating an intra-mode output power error from a power setting value in a mode before switching as a comparison standard value error (equal to step ST32), setting a power setting value of a mode to switch to, such that an inter-mode output power error is canceled (equal to step ST33), calculating an intra-mode output power error from a power setting value of a mode to switch to (equal to step ST35), calculating a gain linearity value based on a power setting value of a mode to switch to and the intra-mode output power error (equal to step ST36), and resetting the power setting value of the mode to switch to, that cancels the comparison standard value error in the mode before switching and the output power error in the mode to switch to, based on the gain linearity value (equal to steps ST37 and 38).

Abstract: A receiving apparatus converges a gain to a target gain even when a fish bone effect signal is included having a low power period in which signal power decreases abruptly compared to average signal power. The receiving apparatus (100) receives a signal including the fish bone effect signal having the low power period (FBE signal period) in which signal power decreases abruptly compared to average signal power. A FBE detecting section (133) detects an FBE signal period of a low power period based on a gain error corresponding to a difference between target power and average signal power of the received signal of the adjusted gain. Further, the gain error correcting section (134) selects a lower value than 1 as a convergence coefficient in the FBE signal period of a low power period, multiplies the gain error with the selected convergence coefficient and corrects the gain error.

Abstract: The transmission apparatus and transmission power controlling method are able to keep high speed feedback control and control transmission power accurately. Polar modulation transmitter (100) is provided with LPF (108) that performs waveform shaping of output power of PA (103) and ADC (109) that obtains output power data for each mode by sampling filtered signals in compressed mode and filtered signals in uncompressed mode at the same phase as the filtered signals in compressed mode. In this way, the phases of sampling signals before and after the mode change are the same, so that it is possible to obtain sampling signals of the same condition before and after the mode change, from filtered signal waveforms. According to feedback control based on these sampling signals, even if drift components remain in the filtered signals, the influence can be ignored, so that it is possible to keep high speed feedback control, and estimate and control transmission power accurately.

Abstract: When switching the mode of a power amplifier between compressed mode and uncompressed mode, accurate transmission power control is realized. A transmission power control method includes setting a power setting value of mode to switch to, such that an inter-mode output power error is canceled (equal to step ST21), calculating an intra-mode output power error from the power setting value of the mode to switch to (equal to step ST23), calculating a gain linearity value based on the power setting value of the mode to switch to and an output power error of the intra-mode (equal to step ST24), and resetting the power setting value of the mode to switch to based on the gain linearity value (equal to steps ST25 and 26).