公开(公告)号：WO1997031428A1

公开(公告)日：1997-08-28

申请号：PCT/US1997001154

申请日：1997-01-27

Applicant: LOCKHEED MARTIN CORPORATION

Inventor： LOCKHEED MARTIN CORPORATION ,  KINGSTON, Samuel, C. ,  GIALLORENZI, Thomas, R. ,  SYLVESTER, Randal, R. ,  MATOLAK, David, W. ,  SMITH, Patrick

IPC: H04B01/707

CPC classification number: H04B1/70755 ,  H04B1/70753 ,  H04B1/7103 ,  H04B2201/709709

Abstract: Disclosed are methods for acquiring a forward channel in a point-to-multipoint CDMA system. One method includes the steps of (a) despreading a received CDMA signal with a first pn code that is known to be present in the received CDMA signal and obtaining a first measure of received signal level; (b) despreading the received CDMA signal with a second pn code that is known not to be present in the received CDMA signal and obtaining a second measure of received signal level; and (c) synchronizing to a desired channel using a difference between the first and second signal levels. In this method the first step of despreading despreads a continuously transmitted side-channel, and the step of synchronizing synchronizes to the side-channel. Also, the step of obtaining a first measure of received signal level obtains a correlation peak, and the step of obtaining a second measure of received signal level obtains a correlation null. Preferably, the steps of despreading and obtaining are accomplished iteratively over a range of n first pn code phase states and over a range of n second pn code phase states.

Abstract translation: 公开了用于在点对多点CDMA系统中获取前向信道的方法。 一种方法包括以下步骤：（a）用已知存在于所接收的CDMA信号中的第一pn码解扩接收的CDMA信号，并获得接收信号电平的第一测量值; （b）用已知不存在于所接收的CDMA信号中的第二pn码解扩接收的CDMA信号，并获得接收信号电平的第二测量值; 和（c）使用第一和第二信号电平之间的差异来同步到期望的信道。 在该方法中，解扩的第一步骤对连续发送的侧信道进行解扩，并且同步步骤与侧信道同步。 此外，获得接收信号电平的第一测量的步骤获得相关峰值，并且获得接收信号电平的第二测量的步骤获得相关无效。 优选地，解扩和获得的步骤在n个第一pn码相位状态的范围内以及在n个第二pn码相位状态的范围上迭代地完成。