公开(公告)号：US20020054583A1

公开(公告)日：2002-05-09

申请号：US09974273

申请日：2001-10-10

Applicant: InterDigital Technology Corporation

Inventor： Robert L. Olesen ,  Timothy A. Axness ,  Leonid Kazakevich

IPC: H04L012/26

CPC classification number: H04W52/52 ,  H03G3/3078 ,  H03M1/185 ,  H04B17/318 ,  H04L5/1484

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.

Abstract translation: 一种用于TDD通信系统中的自动增益控制（AGC）的方法和系统，其中通信信号的每个时隙包含位于时隙开头的二进制相移键控（BPSK）格式的前导码。 由于前同步码允许AGC快速估计信号强度并相应地调整增益，所以改善了接收机的信道估计。 这允许正确地接收跟随前导码的数据突发内的所有数据符号，并且导致更准确的中间码信道估计。 它还允许TDD接收机内的AGC电路大大简化。