Receiving apparatus that receives packet signal

Patent metadata

Field	Value
Publication number	US-9553556-B2
Application number	US-201514793588-A
Country	US
Kind code	B2
Filing date	Jul 7, 2015
Priority date	Jan 27, 2011
Publication date	Jan 24, 2017
Grant date	Jan 24, 2017

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.

First claim

What is claimed is:

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;
a control unit configured to control a gain in the amplifier based on the signal amplified by the amplifier and configured to have the amplifier use the controlled gain, the control unit including:
an averaging unit configured to average a magnitude of the signal amplified by the amplifier; and
a decision unit configured to determine the gain such that the magnitude of the signal averaged by the averaging unit is brought close to a target value when the receiving unit receives the signal; and

storage for storing a first initial value, which is a fixed value, to control the gain when the signal received is a packet signal, and a second initial value, which is a variable value, to control the gain when the signal received is a signal other than the packet signal, the second initial value being varied and saved in the storage as a result of controlling the gain for the signal other than the packet signal, wherein when the signal received by the receiving unit is the packet signal, the decision unit starts to control the gain using the first initial value and changes the gain to a value different from the first initial value,
when the signal received by the receiving unit following the packet signal is the signal other than the packet signal, the decision unit starts to control the gain using the second initial value and when the decision unit changes the gain to a value different from the second initial value, the second initial value in the storage is updated by the value different from the second initial value, and
wherein the decision unit changes a 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 the signal or the case when the signal received by the receiving unit is the signal other than the packet signal.

2. The receiving apparatus according to claim 1 , 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 the packet signal.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Higuchi Keisuke

Classifications

• H03G3/3073 Primary

  Circuits generating control signals when no carrier is present, or in SSB, CW or pulse receivers · CPC title

• H04B1/16

  Circuits · CPC title