Automatic gain control for a time division duplex receiver
AssigneeInterDigital Technology Corporation
InventorsRobert L. Olesen, Timothy A. Axness, Leonid Kazakevich
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Abstract
A method and system for automatic gain control (AGC) in a TDD communication system, wherein each time slot of the communication signal contains a preamble in binary phase shift keying (BPSK) format, located at the beginning of the time slot. The channel estimation by the receiver is improved since the preamble allows AGC to quickly estimate the signal strength and adjust the gain accordingly. This permits all data symbols within the data burst, which follows the preamble, to be correctly received, and results in a midamble channel estimate that is much more accurate. It also allows the AGC circuit within the TDD receiver to be greatly simplified.
Claims4
A TDD wireless communication system, wherein a communication signal is divided into consecutive time slots, each time slot subdivided into sections comprising:
- a preamble, in binary phase shift keying (BPSK) format, located at the beginning of the time slot;
- a midamble at the center of the time slot;
- a pair of data packets;
- two transport format combination indication (TFCI) sections, each positioned between the midamble and one of the data packets;
- and
- a guard period located at the end of the time slot.
A method for automatic gain control (AGC) in a TDD communication system, wherein each time slot of the communication signal contains a BPSK preamble, the method comprising:
- estimating the signal;
- comparing the signal with a predetermined power reference;
- calculating an error signal based on the comparison;
- and
- adjusting the attenuation of the communication signal.
Dependencies are inferred from the claim text.