公开(公告)号：US5825835A

公开(公告)日：1998-10-20

申请号：US606285

申请日：1996-02-23

Applicant: Samuel C. Kingston ,  Thomas R. Giallorenzi ,  Robert William Steagall ,  David Matolak

Inventor： Samuel C. Kingston ,  Thomas R. Giallorenzi ,  Robert William Steagall ,  David Matolak

IPC: H04B1/7077 ,  H04B1/7103 ,  H04B7/26 ,  H04L7/00

CPC classification number: H04B1/7077 ,  H04B1/7103 ,  H04B2201/7071 ,  H04B2201/709709 ,  H04W92/10

Abstract: Disclosed are methods and apparatus for use in a synchronous CDMA communications system (10) that employs orthogonal pn spreading codes. The methods are intended for synchronizing transmissions from a subscriber unit (SU 14) to a radio base unit (RBU 12), and include the steps of: (a) transmitting individual ones of a plurality of bursts from the SU to the RBU, each burst being transmitted with a different pn spreading code timing alignment; (b) receiving individual ones of the plurality of bursts with the RBU and determining a power estimate of each received burst; and (c) in response to a determined power estimate of one of the bursts exceeding a threshold, sending a message from the RBU to the SU. The message indicates that the SU is to use for subsequent transmissions the pn spreading code timing alignment that was employed when transmitting the burst that exceeded the threshold. In a preferred embodiment of this invention the step of transmitting transmits an indication of the pn spreading code timing alignment used when transmitting a given one of the bursts. Each burst is transmitted with a pn spreading code timing alignment that differs by 1/2 chip from a previous pn spreading code timing alignment.

Abstract translation: 公开了在采用正交pn扩展码的同步CDMA通信系统（10）中使用的方法和装置。 这些方法用于同步来自用户单元（SU 14）到无线电基站单元（RBU 12）的传输，并且包括以下步骤：（a）将多个突发中的各个从SU发送到RBU，每个突发 以不同的pn扩频码定时对准发送突发; （b）用所述RBU接收所述多个突发中的各个突发并确定每个接收的突发的功率估计; 和（c）响应于超过阈值的突发之一的确定功率估计，将消息从RBU发送到SU。 消息指示SU用于后续传输，当发送超过阈值的突发时采用的pn扩展码定时对准。 在本发明的优选实施例中，发射步骤在发送给定的一个突发时发送使用的pn扩展码定时对准的指示。 每个脉冲串以从先前的pn扩展码定时对准不同的+ n，f 1/2 + EE码元的pn扩展码定时对准来发送。