公开(公告)号：US20020003814A1

公开(公告)日：2002-01-10

申请号：US09892166

申请日：2001-06-26

Applicant: United Parcel Service of America, Inc.

Inventor： Stephen A. Roth ,  Thomas L. Mosher

IPC: H04J003/06 ,  H04B007/212

CPC classification number: H04L25/062

Abstract: A method is disclosed for optimally adjusting the received bit detection threshold in a digital communication system, such as a TDMA system that is characterized by very short duration burst transmissions. In one embodiment of the invention, a half-duplex radio modem is used for transmission and receipt of messages for airborne and ground-based Automatic Dependent Surveillance-Broadcast (ADS-B) service. A feedback path is provided for in the transmission/receiver unit to provide the transmission signal to the receiver path. A bit detection threshold adjustment circuit receives the transmission signal. The circuit digitizes the analog baseband signal, detects the positive and negative peak values and calculates a peak-to-peak deviation value to define the bit detection threshold value.

Abstract translation: 公开了一种用于最佳地调整数字通信系统中的接收比特检测阈值的方法，诸如以非常短的持续时间突发传输为特征的TDMA系统。 在本发明的一个实施例中，半双工无线调制解调器用于传输和接收用于机载和地面自动相关监视广播（ADS-B）业务的消息。 在发送/接收器单元中提供反馈路径以向接收机路径提供发送信号。 位检测阈值调整电路接收发送信号。 电路对模拟基带信号进行数字化，检测正峰值和负峰值，并计算峰 - 峰偏差值以定义位检测阈值。