Abstract:
아날로그 무선 기기(100)의 열등한 저비용 아날로그 무선 컴포넌트(105)에 의해 야기되는 성능 저하를 보상하기 위해서, 미래 시스템 아키텍처(FSA) 무선 시스템 트랜시버는 수많은 디지털 신호 처리 기술을 사용하여 현재 사양이 완화될 수 있도록 이러한 아날로그 컴포넌트의 결함을 보상한다. 자동 이득 제어(110)는 개선된 위상 및 진폭 보상만 아니라 많은 다른 무선 주파수 파라미터를 제공하도록 디지털 도메인에 제공된다. 무선 컴포넌트, 미래 시스템 아키텍처, 자동 이득 제어, 진폭 보상, 무선 송수신 유닛, RF 파라미터
Abstract:
In order to compensate for performance degradation caused by inferior low-cost analog radio component (105) tolerances of an analog radio (100), a future system architecture (FSA) wireless communication transceiver employs numerous digital signal processing techniques to compensate for deficiencies of such analog components so that modern specifications may be relaxed. Automatic gain control (110) functions are provided in the digital domain, so as to provide enhanced phase and amplitude compensation, as well as many other radio frequency parameters.
Abstract:
A receiver for processing a signal comprises a first amplifier circuit and a second amplifier circuit. The first amplifier circuit is operated in association with a first gain profile. The second amplifier circuit is operated in association with a second gain profile. The receiver further comprises a gain control circuit that determines a quality indicator associated with a modulated signal. The gain control circuit adjusts the first gain profile and the second gain profile based at least in part upon the determined quality indicator.
Abstract:
In order to compensate for performance degradation caused by inferior low-cost analog radio component (105) tolerances of an analog radio (100), a future system architecture (FSA) wireless communication transceiver employs numerous digital signal processing techniques to compensate for deficiencies of such analog components so that modern specifications may be relaxed. Automatic gain control (110) functions are provided in the digital domain, so as to provide enhanced phase and amplitude compensation, as well as many other radio frequency parameters.
Abstract:
PROBLEM TO BE SOLVED: To provide a transmission power controller performing high precision transmission power control over a wide dynamic range while decreasing the number of steps required for regulating a transmission power controller. SOLUTION: The transmission power controller comprises a first variable amplification circuit 122 having resolution of 1 dB and a second variable amplification circuit 123 having resolution of 0.1 dB, a section 106 calculating a correction value for compensating degradation of transmission power accuracy due to environmental variation of frequency characteristics and temperature characteristics, and a correction value for compensating transmission power error, a section 107 for calculating a specified transmission power being outputted to a communication partner corrected based on a received signal, and first and second set value calculating sections 108 and 109 for calculating gain values being set in the first and second variable amplification circuits 122 and 123 based on the corrected transmission power. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To lessen the influence of DC noise due to the AGC gain update in a direct conversion receiver. SOLUTION: As shown with AGC gain update timings t1-t4, etc. in the slot structure of received signals, the timing is shifted every time to disperse and lessen the influence of the DC noise peculiar to the direct conversion accompanying with the AGC gain update. If, especially, the slots of received signals have information (Data) with a high code correcting power and information (TPC, TFCI, PILOT) with a low code correcting power, the AGC gain update timing is shifted in the former information part to generate it, thereby more lessening the influence of the noise. The shift width of the AGC gain update timing is set to be greater than one symbol width of the received signal, thereby further lessening the influence of the noise due to the AGC gain update. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a power supply circuit for a high frequency power amplifier circuit the response of an output voltage of which is excellent, usable for a mobile phone adopting the GSM or WCDMA system, usable for a mobile phone capable of making communication and adopting two communication systems or over such as the GSM and WCDMA systems, and having a high power efficiency. SOLUTION: In the power supply circuit for the high frequency power amplifier circuit, first DC power supply circuits (231, 237) such as a series regulator with a low power efficiency and a high leading characteristic and a second DC power supply circuit (232) such as a switching regulator with a slow leading characteristic and a high power efficiency are used in combination, both the series regulator and the switching regulator are operated at the same time when a high speed rise of power supply voltage is required, and when an output power supply voltage reaches a prescribed level, the series regulator is deactivated. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a highly efficient transmitter capable of covering an output level in a wide range. SOLUTION: The operation mode of a high frequency power amplifier 15 is designated to one between a linear operation mode and a saturation operation mode on the basis of an operation mode designation signal 107. The gain of a variable gain amplifier 14 provided at the preceding stage of the high frequency power amplifier 15 and the values of output voltage 109 and bias current supplied to the high frequency power amplifier 15 from a power voltage/bias current control circuit 17 are changed. In the case of the saturation operation mode, the gain of the variable gain amplifier 14 is configured so as to be always larger by a prescribed amount than in the case of the linear operation mode. This makes the high frequency power amplifier 15 operate in a designated operation mode to secure an output transmission power range widely. COPYRIGHT: (C)2005,JPO&NCIPI