Abstract:
An automatic gain control device includes an amplifier for a reception signal, a signal processing unit, a memory, and a control unit. The amplifier can set a gain. The signal processing unit extracts control data from an output from the amplifier and performs information processing for the data. The memory stores the gain setting value of the amplifier. The control unit controls the gain of the amplifier in accordance with a preset control algorithm. On the basis of the result obtained when the control unit computes a gain setting value stored in the memory in accordance with a preset algorithm, the control unit controls the gain of the amplifier in correspondence with operation of switching the frequency of a reception signal, which is accompanied by different frequency monitoring in the compressed mode by the signal processing unit. A radio communication terminal, a control method for an automatic gain control device, a control program for an automatic gain control device, an automatic gain control method, a radio communication system, and a radio communication method are also disclosed.
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:
A method and apparatus for generating the adaptive gain control signals in a communications receiver is disclosed. The present invention can be used with existing two-stage gain architectures, and overcomes many undesirable characteristics of the previous mechanism. An apparatus is presented wherein each of a plurality of RF AGC gain controllable amplifiers (140 and 150) are individually controlled by individual AGC control signals generated by an AGC controller (105) so that the level of the output signal from each of the RF AGC gain controllable amplifiers is individually optimized for tuner performance (170 and 190).
Abstract:
An automatic gain control device includes an amplifier for a reception signal, a signal processing unit, a memory, and a control unit. The amplifier can set a gain. The signal processing unit extracts control data from an output from the amplifier and performs information processing for the data. The memory stores the gain setting value of the amplifier. The control unit controls the gain of the amplifier in accordance with a preset control algorithm. On the basis of the result obtained when the control unit computes a gain setting value stored in the memory in accordance with a preset algorithm, the control unit controls the gain of the amplifier in correspondence with operation of switching the frequency of a reception signal, which is accompanied by different frequency monitoring in the compressed mode by the signal processing unit. A radio communication terminal, a control method for an automatic gain control device, a control program for an automatic gain control device, an automatic gain control method, a radio communication system, and a radio communication method are also disclosed.
Abstract:
PROBLEM TO BE SOLVED: To provide an RF receiver capable of controlling the signal component of a desired channel at a proper level without saturating a high-frequency amplifying stage. SOLUTION: The RF receiver has an RF amplifying means amplifying a received high-frequency signal, a mixing means converting the output high-frequency signal of the RF amplifying means into an intermediate-frequency signal and an IF amplifying means amplifying the output intermediate-frequency signal of the mixing means. The RF receiver further has a first level detecting means detecting the signal level of the output high-frequency signal of the RF amplifying means, a second level detecting means detecting the signal level of the output intermediate-frequency signal of the mixing means and a third level detecting means detecting the signal level of the intermediate-frequency signal amplified by the IF amplifying means. The RF receiver further has an RF reference-level generating means generating an RF reference level on the basis of at least one of the detecting-signal levels of the first and second level detecting means and an RF-gain control means controlling the amplifying gain of the RF amplifying means so that a value corresponding to the detecting-signal level of the third level detecting means is equalized to the RF reference level. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To realize appropriate AGC for a desired wave signal and an interference wave signal. SOLUTION: There are provided attenuator circuits 42-44 cascade-connected to a received signal SRX and differential amplifiers 51-54 to which the received signal SRX and output signals of the attenuator circuits 42-44 are supplied, respectively. There are also provided resistors R55, R56 connected in common to output terminals of the differential amplifiers 51-54 so as to extract level-controlled output signals and a control current generating circuit 34 for generating control currents I51-I54 of predetermined characteristics from first and second AGC voltages VAGC, VOL. The control currents I51-I54 outputted from the control current generating circuit 34 are supplied to the differential amplifiers 51-54 as their operation switching and gain control signals. A control current Im equal to the control currents I51-I54 is negatively fed back by the control current generating circuit 34. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
In a slot format of a received signal, AGC gain update timings (t1 to t4) are shifted every time to disperse and reduce an influence of a noise attributable to a direct current component specific to direct conversion which is accompanied by AGC gain update. In particular, in the case where each of slots in the received signal includes an information portion (data) having a larger code correcting capability and an information portion having a smaller code correcting capability (TPC (transmission power control), TFCI (transport format combination indicator), PILOT), the AGC gain update timing is generated while being shifted in the former information portion, thereby reduce the influence of the noise. When the amount of shift of the AGC gain update timing is set to be larger than that of one symbol of the received signal, the influence of the noise accompanied by the AGC gain update is further reduced.
Abstract:
PROBLEM TO BE SOLVED: To provide an automatic gain control device and the automatic gain control method which converge control action in a stable state during a short period of time in changing frequency of a receiving radio signal which occurs at the time of a compressed mode of WCDMA (Wideband Code Division Multiple Access), etc. SOLUTION: A memory device storing a gain setting value is installed in the automatic gain control device, in changing frequency of the receiving signal from a gain setting value stored in the past, the device predicts and calculates the optimal gain setting value corresponding to a frequency after the change is carried out. The changing over of the frequency is carried out using the gain setting value which is predicted and calculated. COPYRIGHT: (C)2006,JPO&NCIPI