Automatic gain controlling device and method, and radio communication device
First Claim
1. An automatic gain controller which controls the signal strength to a predetermined level in time-division-based multi-slot communications which perform communications in a plurality of time slots in a predetermined frame time, said automatic gain controller comprising:
- received signal strength detecting means for detecting a received signal strength in each of said plurality of time slots;
received signal average strength calculating means for determining whether said detected received signal strength is abnormal, assigning a weight to the received signal strength which is lighter than that assigned to a normal value in case the signal strength value is abnormal, and then calculating a received signal average strength in each time slot;
average multi-slot received strength calculating means for determining whether said calculated received signal average strength is abnormal, assigning a weight to the received signal strength which is lighter than that assigned to a normal value and in case the signal strength is abnormal, and then calculating an average value of a plurality of received signal average strengths in a frame; and
gain control means for controlling the received signal strength to a predetermined level by using a gain control signal which is based on said calculated average multi-slot received strength.
1 Assignment
0 Petitions
Accused Products
Abstract
In a cellular system which is based on the TDMA system performing multi-slot communications, a DSP and a controller detect the received signal strength in each of a plurality of time slots received by an RF input section and, in case the received signal strength is abnormal, assign a weight to the received signal strength which is lighter than that assigned to a normal value thus calculating a received signal average strength in each time slot. In case each of these received signal average strength is abnormal, the DSP and the controller assign a weight to the received signal strength which is lighter than that assigned to a normal value to calculate the average value of a plurality of received signal average strengths in a frame. A gain control signal which is based on the average multi-slot received strength is fed back to an automatic gain control circuit to perform automatic gain control for setting the received signal strength to a predetermined value. This makes it possible to receive signals in a plurality of time slots in a frame by way of a same gain setting in a stable fashion.
-
Citations
6 Claims
-
1. An automatic gain controller which controls the signal strength to a predetermined level in time-division-based multi-slot communications which perform communications in a plurality of time slots in a predetermined frame time, said automatic gain controller comprising:
-
received signal strength detecting means for detecting a received signal strength in each of said plurality of time slots;
received signal average strength calculating means for determining whether said detected received signal strength is abnormal, assigning a weight to the received signal strength which is lighter than that assigned to a normal value in case the signal strength value is abnormal, and then calculating a received signal average strength in each time slot;
average multi-slot received strength calculating means for determining whether said calculated received signal average strength is abnormal, assigning a weight to the received signal strength which is lighter than that assigned to a normal value and in case the signal strength is abnormal, and then calculating an average value of a plurality of received signal average strengths in a frame; and
gain control means for controlling the received signal strength to a predetermined level by using a gain control signal which is based on said calculated average multi-slot received strength. - View Dependent Claims (2, 3)
-
-
4. An automatic gain control method for controlling the signal strength to a predetermined level in time-division-based multi-slot communications which perform communications in a plurality of time slots in a predetermined frame time, said automatic gain control method comprising:
-
a received signal strength detecting step of detecting a received signal strength in each of said plurality of time slots;
a received signal average strength calculating step of determining whether said detected received signal strength is abnormal and in case the signal strength value is abnormal, assigning a weight to the received signal strength which is lighter than that assigned to a normal value thus calculating a received signal average strength in each time slot;
an average multi-slot received strength calculating step of determining whether said calculated received signal average strength is abnormal, assigning a weight to the received signal strength which is lighter than that assigned to a normal value in case the signal strength is abnormal, and calculating an average value of a plurality of received signal average strengths in a frame, and a gain control step of controlling the received signal strength to a predetermined level by using a gain control signal which is based on said calculated average multi-slot received strength. - View Dependent Claims (6)
-
-
5. Radio communications apparatus used for time-division-based multi-slot communications which perform communications in a plurality of time slots in a predetermined frame time, said radio communications apparatus comprising:
-
receiving means for receiving a burst signal in each time slot in synchronization with a plurality of time slots in said frame time;
received signal strength detecting means for detecting a received signal strength in each of said plurality of time slots;
received signal average strength calculating means for determining whether said detected received signal strength is abnormal, assigning a weight to the received signal strength which is lighter than that assigned to a normal value in case the signal strength value is abnormal, and then calculating a received signal average strength in each time slot; and
gain control means for controlling the received signal strength to a predetermined level by using a gain control signal which is based on said calculated average multi-slot received strength.
-
Specification