Spread spectrum subscriber unit for analyzing multipath components

• US 6,798,824 B2
• Filed: 02/12/2002
• Issued: 09/28/2004
• Est. Priority Date: 03/22/1999
• Status: Expired due to Term

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Mesecher, David K.
• Primary Examiner(s): PHU, PHUONG M
• Application Number:
  US10/074,399
• Publication Number:
  US 20020141484A1
• Time in Patent Office: 959 Days
• Field of Search: 375/130, 375/140-144, 375/148-150, 455/456, 455/457, 455/423, 455/424, 455/522, 455/562, 342/127, 342/457, 342/145
• US Class Current: 375/145
• CPC Class Codes: G01S 5/0218 Multipath in signal reception
• CPC Class Codes: G01S 5/12 by co-ordinating position lines of different shape, e.g. hyperbolic, circular, elliptical or radial
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management

Abstract

A subscriber unit receives a plurality of first spread spectrum signals. Each first spread spectrum signal has a first code. An impulse response of multipath components of each received first spread spectrum signal are analyzed to determine a first received component of that received first spread spectrum signal. In one embodiment, for each received first spread spectrum signal, a second spread spectrum signal having a second chip code time synchronized to the first received component of that received first spread spectrum signal is transmitted. In another embodiment, a code timing difference is determined between the first received components of the received first spread spectrum signals. The code timing difference is transmitted.

Claims

1. A subscriber unit comprising:

means for receiving a plurality of first spread spectrum signals, each first spread spectrum signal having a first code

means for analyzing an impulse response of multipath components of each received first spread spectrum signal to determine a first received component of that received first spread spectrum signal;

means for each received first spread spectrum signal for transmitting a second spread spectrum signal having a second chip code time synchronized to the first received component of that received first spread spectrum signal;

means for determining a code timing difference between the first received components of the received first spread spectrum signals; and

means for transmitting the code timing difference.

2. The subscriber unit of claim 1 wherein the first spread spectrum signal is a pilot signal.