Abstract:
PROBLEM TO BE SOLVED: To provide an electronic apparatus system which can reduce power consumption without the need for manual operation. SOLUTION: The electronic apparatus system comprises a reaming amount detection part which detects a remaining amount of a secondary battery, a transmission part which transmits a signal corresponding to the detection result of the remaining amount detection part, an AC-DC conversion part which converts an AC voltage to a DC voltage and feeds it to the secondary battery, a receiving part which receives a signal transmitted by the transmission part, and a control part which controls AC-DC conversion by the AC-DC conversion part when the receiving part receives the signal. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a wireless communication device which accurately and efficiently performs the resource control of a signal processing device. SOLUTION: The wireless communication device has a wireless sending and receiving device 2 for sending and receiving wireless signals, a signal processing device 3 which includes a resource capable of redefining a signal processing function according to software modules and is constituted so that the resource can perform necessary signal processing at the time of sending and receiving, a storing device 5 which stores several software modules corresponding to several wireless communication systems and a controller 4 which reads out at least software modules from the storing device 5 corresponding to the specific wireless communication systems and controls the signal processing device 3 and the storing device 5 so that the read out software modules can be provided for the resource. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a wireless communication system for enabling low power consumption at the use of a control channel and the efficient utilization of frequency band resources, and to provide a transmitter, a receiver, and a transmitter-receiver. SOLUTION: In the case of using a data channel, a modulation signal is subjected to serial parallel conversion (402) and Fourier inverse transform (403) to generate a quadrature frequency multiplexing signal and the signal is transmitted by the multicarrier system. In the case of using the control channel, switches (418, 419) are changed over and the modulation signal is transmitted by the single carrier system without applying the Fourier inverse transform to the modulation signal. Thus, the power consumption in the case of using the control channel is lowered and in the case of communicating a voice signal and a data signal or the like, the frequency utilizing efficiency can be improved. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a radio communication system for reducing cost of system and realizing high-speed communication in an upward line while transmission power of a radio terminal is reduced. SOLUTION: A main base station 1, distributed base stations 2A, 2B provided in a coverage area 11 of the main base station 1 are provided. In the downward line, the main base station 1 receives a transmission signal directly from radio terminals 3A, 3B located in a coverage area. In the upward line, the main base station 1 selects a receive path, in which a transmission signal is received directly from the radio terminal 3B, or a receive path, in which the transmission signal is received from the radio terminal 3A through the distributed base stations 2A according to receive conditions of the radio terminals 3A, 3B for the transmission from the main base station 1 and distributed base stations 2A, 2B. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a radio communication system for performing radio communication corresponding to the state of a transmission line. SOLUTION: A transmitter 10 performs communication with a receiver 20 in the radio communication system by the use of an OFDM (Orthogonal Frequency Division Multiplexing) signal. The transmitter 10 includes modulating means 102, 104 for changing a relative phase between adjacent OFDM sub-carriers in one OFDM symbol in response to information to be transmitted; an an OFDM signal transmitting means 114 for transmitting the OFDM signal modulated by the modulating means 102, 104 to the receiver 20. The receiver 20 includes an OFDM signal receiving means 202 for receiving the OFDM signal from the transmitter 10; and decoding means 210, 212 for decoding the OFDM signal received by the receiving means 202. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To search for a path so as to be able to secure a stable receiving operation adaptively in accordance with a change in an environment. SOLUTION: A coefficient setting part 41 sets coefficients β and γ in accordance with the fluctuation velocity of a transmission path. A first updating part 43 updates a first average correlation power value to a value obtained by averaging a second instantaneous correlation power value calculated by a searcher 42 and a first average correlation power value stored in a first table 44 with weight corresponding to a coefficient α. A second updating part 45 updates a second average correlation power value to a value obtained by averaging a first instantaneous correlation power value calculated by a RAKE finger 31 and a second average correlation power value stored in a second table 46 with weight corresponding to the coefficient β. A third updating part 47 generates a delay profile including a third average correlation power value obtained in each phase of a diffusion code by respectively adding the first average correlation power value and the second average correlation power value to a value weighted in accordance with the coefficient γ. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To enable throughput concerning a mobile station, to be improved, located in the vicinity of a boundary of a base station service area, thereby making throughput more uniform at each location within the base station service area. SOLUTION: Base stations BS1-BS6 perform an adaptive modulation based on a reception quality at a mobile station MS. The base stations BS1-BS6 permit an auxiliary transmission of information to the mobile station MS located in another station cell, if a traffic within their own cells is equal to or less than the first threshold value. If the mobile station MS can receive a pilot signal transmitted from the base stations BS1-BS6 whose auxiliary transmission is permitted with a reception intensity of equal to or more than the second threshold value, the mobile station MS requests the auxiliary transmission from the base stations BS1-BS6 and receives the auxiliary transmission from the base stations BS1-BS6. The mobile station MS combines information signals transmitted from the base stations BS1-BS6 in the zone with the auxiliary information signals transmitted, thereby improving the reception quality. COPYRIGHT: (C)2004,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a signal processing apparatus configuring a wireless communication terminal. SOLUTION: The wireless communication terminal comprises: overall signal processing units (21, 22, 23) including general-purpose processors; and a plurality of signal processing units, the signal processing units including processors (31 to 36) for executing processing by a software system including the same instruction words as those of function blocks (25 to 30) performing different processes. Each function block is operated directly or selectively according to an instruction of a corresponding processor or according to a program produced by the instruction, the signal processing units are controlled by the overall signal processing units, and the processor of each signal processing unit is operated according to the instruction of the general-purpose processors. COPYRIGHT: (C)2004,JPO
Abstract:
PROBLEM TO BE SOLVED: To provide a radio communication system where the influence of interference between symbols in the multi-path transmission of the radio communication system is reduced and communication quality is improved, and to provide radio communication equipment. SOLUTION: In the radio communication system, the inverse number of the generation period (symbol rate) of a discrete signal becomes not more than 1/2 with respect to frequency band width where radio communication is executed. Radio communication equipment has an RF front end 21 for converting a radio signal into a base band signal, a low-pass filter 22 limiting the band of a reception signal, an AD converter 23 sampling a received analog signal, a control circuit 24 controlling the optimum sample timing of the reception signal and a judgment unit 25 demodulating the signal modulated form the sample of controlled timing.
Abstract:
PROBLEM TO BE SOLVED: To provide a rake receiver capable of improving resistance to multipath and fading in the circuit constitution of a small scale. SOLUTION: One of reception signals frequency-converted in frequency conversion circuits 21-2n is successively selected in a changeover cycle t1 in a selection circuit 30, inputted to a matched filter 401 and demodulated there by repeatedly multiplying a code for timing detection to the reception signal by a cycle t2. The demodulated signals are averaged over plural frames for each cycle t2 in an averaging circuit 402, then the power level is detected in a reception path selection circuit 50 and then, the (m) pieces of timings capable of obtaining a high-order demodulation power level are detected among the reception signals outputted by the frequency conversion circuits 21-2n and allocated to inverse diffusion circuits 71-7m. Also, the selection circuits 61-6n are changeover- controlled so as to select the reception signals corresponding to the timing by the reception path selection circuit 50.