Spread spectrum communication system and method using a reference signal and a plurality of message signals

• US 7,020,114 B2
• Filed: 02/08/2002
• Issued: 03/28/2006
• Est. Priority Date: 12/05/1990
• Status: Expired due to Fees

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Schilling, Donald L.
• Primary Examiner(s): HSU, ALPUS
• Application Number:
  US10/071,728
• Publication Number:
  US 20020126638A1
• Time in Patent Office: 1,509 Days
• Field of Search: 370/203, 370/206, 370/208, 370/329, 370/335, 370/342, 375/130, 375/140, 375/141, 375/145, 375/147, 375/149, 380/33, 380/34, 380/44, 380/46, 455/450, 455/451, 455/452, 455/456, 455/509, 455/517, 455/524, 455/67.1, 455/67.6
• US Class Current: 370/335
• CPC Class Codes: G01S 13/82 wherein continuous-type signals are transmitted
• CPC Class Codes: G01S 5/0036 of measured values, i.e. measurement on mobile and position calculation on base station
• CPC Class Codes: G01S 5/14 Determining absolute distances from a plurality of spaced points of known location
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 1/71 the interference being narrowband interference
• CPC Class Codes: H04B 1/7102 with transform to frequency domain
• CPC Class Codes: H04B 2201/70701 featuring pilot assisted reception
• CPC Class Codes: H04B 2201/709709 Methods of preventing interference
• CPC Class Codes: H04B 7/18547 for geolocalisation of a station position fixing by direction or distance determination G01S5/00
• CPC Class Codes: H04B 7/216 Code division or spread-spectrum multiple access [CDMA, SSMA]
• CPC Class Codes: H04B 7/2628 using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] H04B7/2618 takes precedence
• CPC Class Codes: H04B 7/2631 for broadband transmission
• CPC Class Codes: H04J 13/00 Code division multiplex systems for frequency hopping H04B1/713
• CPC Class Codes: H04W 4/12 Messaging; Mailboxes; Announcements
• CPC Class Codes: H04W 4/18 Information format or content conversion, e.g. adaptation by the network of the transmitted or received information for the purpose of wireless delivery to users or terminals
• CPC Class Codes: H04W 52/343 taking into account loading or congestion level
• CPC Class Codes: H04W 52/346 distributing total power among users or channels
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management
• CPC Class Codes: H04W 64/006 with additional information processing, e.g. for direction or speed determination
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 : Access point devices

Abstract

A spread spectrum communication system produces a reference signal. A plurality of message signals are produced. Each message signal has message data. The reference signal and the plurality of message signals are combined as a combined spread spectrum signal. The combined spread spectrum signal is received. The reference signal is detected within the received combined spread spectrum signal. The message data of the plurality of message signals is recovered using the reference signal.

Claims

1. A method for transferring data in a code division multiple access communication system, the method comprising:

generating a generic code to produce a generic spread spectrum signal;

generating a plurality of message codes;

spread spectrum processing data with the plurality of message codes to produce a plurality of spread spectrum message signals;

combining the generic spread spectrum signal and the plurality of spread spectrum message signals to produce a combined spread spectrum signal;

modulating the combined spread spectrum signal to a radio frequency signal with a carrier signal and transmitting the radio frequency signal;

receiving the radio frequency signal;

using a replica of the generic code, recovering the carrier signal from the radio frequency signal;

acquiring and tracking the recovered-carrier signal and synchronizing the replica of the generic code to the recovered carrier signal;

generating a plurality of replicas of the message codes, the replicas of the message codes synchronized to the replica of the generic code; and

despeading the radio frequency signal with the plurality of the replicas of the message codes to produce the data.

2. A code division multiple access receiver comprising:

means for receiving a radio frequency signal;

means using a generic code, for recovering a carrier signal from the radio frequency signal;

means for acquiring and tracking the recovered-carrier signal and synchronizing the generic code to the recovered carrier signal;

means for generating a plurality of message codes, the message codes synchronized to the generic code; and

means for despeading the radio frequency signal with the plurality of the message codes to produce the data.

3. A code division multiple access receiver comprising:

a power splitter receiving a radio frequency signal;

a generic mixer for mixing a generic code with the radio frequency signal to recover a carrier signal from the radio frequency signal;

an acquisition and tracking device for acquiring and tracking the recovered-carrier signal and synchronizing the generic code to the recovered carrier signal;

a plurality of message code generators for generating a plurality of message codes, the message codes synchronized to the generic code; and

a plurality of message code mixers for despeading the radio frequency signal with the plurality of the message codes to produce the data.