Receiving Apparatus And Gain Controlling Method

• US 20020183028A1
• Filed: 08/20/2001
• Published: 12/05/2002
• Est. Priority Date: 12/28/1999
• Status: Abandoned Application

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Takahashi, Hideyuki, Kitade, Takashi
• Application Number:
  US09/913,848
• Publication Number:
  US 20020183028A1
• Time in Patent Office: Days
• US Class Current: 455/232.1
• CPC Class Codes: H03G 3/3052 in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver H03G3/32, H03G3/34 take precedence
• CPC Class Codes: H03G 3/3068 Circuits generating control signals for both R.F. and I.F. stages
• CPC Class Codes: H03M 1/185 the determination of the range being based on more than one digital output value, e.g. on a running average, a power estimation or the rate of change
• CPC Class Codes: H04B 1/1027 assessing signal quality or detecting noise/interference for the received signal
• CPC Class Codes: H04B 1/7107 Subtractive interference cancellation
• CPC Class Codes: H04B 7/005 Control of transmission; Equalising
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/52 using AGC [Automatic Gain Control] circuits or amplifiers

Abstract

A SINR measuring section 108 measures a ratio between a desired signal and an interference signal based on an output signal of an A/D converter 104 and an output signal of an interference canceller 108. An absolute electric field intensity calculator 111 calculates absolute electric field intensity of a desired signal based on said ratio between the desired signal and the interference signal and electric field intensity of said received signal. A determination section 112 determines the relationship between absolute electric field intensity of said desired signal and a preset target object in terms of the valve large and small. A gain coefficient calculator 113 calculates a gain coefficient based on the determination result of the determination section 112, and controls a gain of an AGC section 103. This makes it possible to perform AGC accurately and to prevent deterioration of reception quality.

Claims

1. A receiving apparatus comprising:

automatic gain controlling means for providing automatic gain control to a received signal based on a gain coefficient;

SINR measuring means for measuring a ratio between a desired signal and an interference signal of the signal subjected to automatic gain control;

electric field intensity measuring means for measuring electric field intensity of the received signal;

absolute electric field intensity calculating means for calculating absolute electric field intensity of a desired signal based on said ratio between the desired signal and the interference signal and electric field intensity of said received signal; and

gain coefficient calculating means for calculating a gain coefficient based on the relationship between absolute electric field intensity of the desired signal and a preset target value in terms of the value of large and small;

2. A receiving apparatus comprising:

automatic gain controlling means for providing automatic gain control to a received signal based on a gain coefficient;

SINR measuring means for measuring a ratio between a desired signal and an interference signal of each user in a self-cell from the signal subjected to automatic gain control;

electric field intensity measuring means for measuring electric field intensity of the received signal;

absolute electric field intensity calculating means for calculating a total value of absolute electric field intensity of desired signals of all users in the self-cell based on said ratio between the desired signal and the interference signal and electric field intensity of said received signal; and

gain coefficient calculating means for calculating a gain coefficient based on the relationship between a total value and a preset target value in terms of the value of large and small.

3. The receiving apparatus according to claim 1, wherein said gain coefficient calculating means adds a preset corrected value to a previous gain coefficient when absolute electric field intensity of the desired signal is more than the target value, and subtracts said corrected value from said previous gain coefficient when absolute electric field intensity of the desired signal is less than the target value.

4. The receiving apparatus according to claim 1, wherein signal amplitude that can be expressed by bits is set as a target value.

5. The receiving apparatus according to claim 1, wherein a value obtained by subtracting a margin from signal amplitude that can be expressed by bits is set as a target value.

6. A radio communication terminal apparatus having a receiving apparatus therein, said receiving comprising

automatic gain controlling means for providing automatic gain control to a received signal based on a gain coefficient;

SINR measuring means for measuring a ratio between a desired signal and an interference signal of the signal subjected to automatic gain control;

electric field intensity measuring means for measuring electric field intensity of the received signal;

absolute electric field intensity calculating means for calculating absolute electric field intensity of a desired signal based on said ratio between the desired signal and the interference signal and electric field intensity of said received signal; and

gain coefficient calculating means for calculating a gain coefficient based on the relationship between absolute electric field intensity of the desired signal and a preset target value in terms of the value of large and small.

7. A gain controlling means comprising the steps of:

providing automatic gain control to a received signal to be converted to a digital signal;

measuring a ratio between a desired signal and an interference signal based on a signal where an interference signal is removed from said digital signal and said digital signal;

calculating absolute electric field intensity of the desired signal based on said ratio between the desired signal and the interference signal and electric field intensity of said received signal; and

calculating a gain coefficient of a next automatic gain control based on the relationship between absolute electric field intensity of said desired signal and a preset target object in terms of the value of large and small.

8. A gain controlling means comprising the steps of:

providing automatic gain control to a received signal to be converted to a digital signal;

measuring a ratio between a desired signal and an interference signal of each user in a self-cell based on a signal where an interference signal is removed from said digital signal and said digital signal;

calculating a total value of absolute electric field intensity of the desired signals of all users in the self-cell based on said ratio between the desired signal and the interference signal and electric field intensity of said received signal; and

calculating a gain coefficient of a next automatic gain control based on the relationship between said total value and a preset target object in terms of the value of large and small.

9. The gain controlling method according to claim 7, wherein a preset corrected value is added to a previous gain coefficient when absolute electric field intensity of the desired signal is more than the target value and said preset corrected value is subtracted from said previous gain coefficient when absolute electric field intensity of the desired signal is less than the target value.