Spread spectrum subscriber unit for analyzing multipath components

• US 20020141484A1
• Filed: 02/12/2002
• Published: 10/03/2002
• Est. Priority Date: 03/22/1999
• Status: Active Grant

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Mesecher, David K.
• Granted Patent: US 6,798,824 B2
• Time in Patent Office: Days
• US Class Current: 375/147
• 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; and

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.

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

3. The subscriber unit of claim 1 further comprising:

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.

4. 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 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.

5. The subscriber unit of claim 4 wherein the first spread spectrum signal is a pilot signal.

6. The subscriber unit of claim 4 further comprising:

means for each received first spread spectrum signal for transmitting a second spread spectrum signal having a second chip code time synchronized to that received first spread spectrum signal.