# US 2013/0156137 A1 · Receiving apparatus that receives packet signal

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- Number: US 2013/0156137 A1
- Document ID: US20130156137A1
- Status: Published application
- Kind: A1
- Application number: 13/768,791
- Filed: 2013-02-15
- Published: 2013-06-20
- Earliest claimed: 2011-01-27
- Assignees: Sanyo Electric Co., Ltd.
- Inventors: Keisuke HIGUCHI
- Web page: https://patentgrep.com/patent/US20130156137A1

## CPC

- H03G 3/3073: {Circuits generating control signals when no carrier is present, or in SSB, CW or pulse receivers}
- H04B 1/16: Circuits
- H03G: CONTROL OF AMPLIFICATION
- H04B: TRANSMISSION

## Abstract

An RF unit receives predetermined signals. The RF unit amplifies the received signals. A gain control unit controls the gain at the RF unit based on the amplified signal and has the RF unit use the controlled gain. The gain control unit performs different controls on the received signals, depending on the case when the received signal is a known signal placed in the beginning of packet signal and the case when the received signal is a signal other than the packet signal.

## Claims

### Claim 1

A receiving apparatus comprising:
a receiving unit configured to receive a signal;
an amplifier configured to amplify the signal received by the receiving unit; and
a control unit configured to control a gain in the amplifier based on a signal amplified by the amplifier and configured to have the amplifier use the controlled gain,
wherein the control unit performs different controls on the signals received by the receiving unit, depending on a case when the received signal is a known signal placed in the beginning of packet signal or a case when the received signal is a signal other than the packet signal.

### Claim 2 (depends on 1)

A receiving apparatus according to claim 1, the control unit including:
an averaging unit configured to average the magnitude of signals amplified by the amplifier; and
a decision unit configured to determine the gain such that the magnitude averaged by the averaging unit is brought close to a target value,
wherein the averaging unit changes an average period depending on the case when the signal received by the receiving unit is a known signal placed in the beginning of packet signal or the case when the signal received by the receiving unit is a signal other than the packet signal.

### Claim 3 (depends on 2)

A receiving apparatus according to claim 2, wherein the averaging unit sets the average period of the signals received by the receiving unit such that the average period of the signal other than the packet signal is longer than the average period of the known signal placed in the beginning of the packet signal.

### Claim 4 (depends on 1)

A receiving apparatus according to claim 1, the control unit including:
an averaging unit configured to average the magnitude of signals amplified by the amplifier; and
a decision unit configured to determine the gain such that the magnitude thereof averaged by the averaging unit is brought close to a target value,
wherein the decision unit changes the magnitude of the target value, depending on the case when the signal received by the receiving unit is a known signal placed in the beginning of packet signal or the case when the signal received by the receiving unit is a signal other than the packet signal.

### Claim 5 (depends on 4)

A receiving apparatus according to claim 4, wherein the decision unit sets the target value of the signal received by the receiving unit such that the magnitude of the target value of the signal other than the packet signal is smaller than the magnitude of the target value of the known signal placed in the beginning of packet signal.

### Claim 6

A receiving apparatus comprising:
a receiving unit configured to receive a signal;
an amplifier configured to amplify the signal received by the receiving unit; and
a control unit configured to control a gain in the amplifier based on a signal amplified by the amplifier and configured to have the amplifier use the controlled gain,
wherein, when the signal received by the receiving unit is a known signal placed in the beginning of packet signal, the control unit starts to perform control using a predetermined initial value, and
when the receiving unit stops receiving the packet signal, the control unit performs another control using the predetermined initial value.

### Claim 7 (depends on 6)

A receiving apparatus according to claim 6, wherein the control unit uses a final value of the gain used before the packet signal has been received, as the initial value.

### Claim 8

A receiving apparatus comprising:
a receiving unit configured to receive a signal;
an amplifier configured to amplify the signal received by the receiving unit; and
a control unit configured to control a gain in the amplifier based on a signal amplified by the amplifier and configured to have the amplifier use the controlled gain,
wherein the control unit changes frequency, at which the gain is updated, depending on a case when the signal received by the receiving unit is a known signal placed in the beginning of packet signal or a case when the signal received by the receiving unit is a signal other than the packet signal.

### Claim 9 (depends on 8)

A receiving apparatus according to claim 8, wherein the control unit sets the frequency, at which the gain is updated, such that the frequency of update in the signal other than the packet signal is lower than the frequency of update in the known signal placed in the beginning of packet signal.

### Claim 10 (depends on 9)

A receiving apparatus according to claim 9, the control unit including:
an averaging unit configured to average the magnitude of signals amplified by the amplifier;
a decision unit configured to determine the gain such that the magnitude thereof averaged by the averaging unit is brought close to a target value; and
an instruction unit configured to instruct the amplifier to use the gain determined by the decision unit,
wherein, when the signal received by the receiving unit is a known signal placed in the beginning of packet signal, the instruction unit instructs use of the gain for each interval based on an average period in the averaging unit and a response period at the amplifier, and
when the signal received by the receiving unit is the signal other than the packet signal, the instruction unit instructs use of the gain for each interval based on the average period in the averaging unit, the response period at the amplifer and waiting time period at the amplifier.

### Claim 11 (depends on 10)

A receiving apparatus according to claim 10, wherein the averaging unit sets the average period of the signals received by the receiving unit such that the average period of the signal other than the packet signal is longer than the average period of the packet signal having the known signal placed in the beginning.

### Claim 12

A receiving apparatus comprising:
a receiving unit configured to receive a packet signal having a known signal placed in the beginning;
an amplifier configured to amplify the packet signal received by the receiving unit; and
a control unit configured to control a gain in the amplifier based on the known signal in the packet signal amplified by the amplifier and configured to have the amplifier use the controlled gain,
the control unit including:
an averaging unit configured to sequentially average the magnitude of a signal amplified by the amplifier in a period shorter than that of the known period; and
a decision unit configured to adjust the gain until when the magnitude thereof averaged sequentially by the averaging unit lies within a target range and configured to fix the gain when the magnitude thereof averaged sequentially by the averaging unit lies within the target range,
wherein the decision unit sets the widths of the target range such that the width thereof in a case where the gain is smaller than a maximum value differs from that in a case where the gain is the maximum value.

### Claim 13 (depends on 12)

A receiving apparatus according to claim 12, wherein the decision unit sets the widths of the target ranges such that the width thereof in the case where the gain is the maximum value is larger than that in the case where the gain is smaller than the maximum value.

### Claim 14 (depends on 12)

A receiving apparatus according to claim 12, wherein, when the gain is smaller than the maximum value, the decision unit enlarges the width of the target range from the previous target range.