Spread spectrum base station

• US 6,925,071 B2
• Filed: 02/08/2002
• Issued: 08/02/2005
• 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:
  US10/072,083
• Publication Number:
  US 20020118660A1
• Time in Patent Office: 1,271 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 remote unit produces a message signal having message data. A reference signal is produced. The reference signal is used to recover the message data from a combined spread spectrum signal. The reference signal and the message signal is combined as a combined signal. The combined signal is transmitted as the combined spread spectrum signal.

Claims

1. A spread spectrum base station comprising:

means for receiving a combined spread spectrum signal, the spread spectrum signal including a reference signal and a plurality of message signals, the message signals having message data;

means, including a plurality of detector means and synchronization means, for detecting the reference signal within the received combined spread spectrum signal;

means for generating a base reference signal at the base station;

means to synchronize the base reference signal with the detected reference signal; and

means for recovering the message data of at least one of the message signals using information from the detected reference signal, said means demodulating each of a plurality of message data signals.

2. The base station of claim 1 further comprising:

means for recovering a carrier signal from the spread spectrum signal using the reference signal; and

wherein the message data recovering means uses the recovered carrier signal to recover the message data.

3. The base station of claim 1 wherein the spread spectrum signal is in a code division multiple access format.

4. The base station of claim 1, wherein:

the means for generating a base reference signal at the base station relays the reference signal, the base reference signal transmitted from the base station;

the base station spread-spectrum processes the base message data with the base reference signal, and combines the spread-spectrum-processed base message data with the base-reference signal as a base-CDMA signal; and

the base station transmits the base-CDMA signal over a communications channel to a remote station.

5. The base station of claim 1, wherein:

the means for generating a base reference signal at the base station uses the reference signal to set the timing for a different base reference signal, the base reference signal transmitted from the base station;

the base station spread-spectrum processes the base message data with the base reference signal, and combines the spread-spectrum-processed base message data with the base-reference signal as a base-CDMA signal; and

the base station transmits the base-CDMA signal over a communications channel to a remote station.

6. A spread spectrum base station comprising:

means for receiving a combined spread spectrum signal, the spread spectrum signal including a reference signal and a message signal, the message signal having message data;

means, including a plurality of detector means and synchronization means, for recovering a carrier signal of the combined spread spectrum signal using information from the detected reference signal;

means for generating a base reference signal at the base station;

means to synchronize the base reference signal with the detected reference signal; and

means for recovering the message data using the recovered carrier signal.

7. The base station of claim 6 wherein the spread spectrum signal is in a code division multiple access format.

8. The base station of claim 6, wherein:

the means for generating a base reference signal at the base station relays the reference signal, the base reference signal transmitted from the base station;

the base station spread-spectrum processes the base message data with the base reference signal, and combines the spread-spectrum-processed base message data with the base-reference signal as a base-CDMA signal; and

the base station transmits the base-CDMA signal over a communications channel to a remote station.

9. The base station of claim 6, wherein:

the means for generating a base reference signal at the base station uses the reference signal to set the timing for a different base reference signal, the base reference signal transmitted from the base station;

the base station spread-spectrum processes the base message data with the base reference signal, and combines the spread-spectrum-processed base message data with the base-reference signal as a base-CDMA signal; and

the base station transmits the base-CDMA signal over a communications channel to a remote station.

10. A spread spectrum base station comprising:

means for detecting a remote-generic-chip-code signal;

means for producing a message signal having message data;

means for producing a base-chip-code signal, the base-chip-code signal for use in recovering the message data from a combined spread spectrum signal;

means to produce a base message signal having base message data;

means for combining the base-chip-code signal and the base message signal as a combined signal; and

means for transmitting the combined signal as the combined spread spectrum signal.

11. The base station of claim 10, wherein:

the means for generating a base-chip-code signal at the base station relays the detected chip-code signal, the base-chip-code signal transmitted from the base station;

the base station spread-spectrum processes the base message data with the base-chip-code signal, and combines the spread-spectrum-processed base message data with the base-chip-code signal as a base-CDMA signal; and

the base station transmits the base-CDMA signal over a communications channel to a remote station.

12. The base station of claim 10, wherein:

the means for generating a base-chip-code signal at the base station uses the detected chip-code signal to set the timing for a different base-chip-code signal, the base-chip-code signal transmitted from the base station;

the base station spread-spectrum processes the base message data with the base-chip-code signal, and combines the spread-spectrum-processed base message data with the base-chip-code signal as a base-CDMA signal; and

the base station transmits the base-CDMA signal over a communications channel to a remote station.

13. A spread spectrum base station comprising:

means for detecting a remote-generic-clip-code signal;

means for producing a plurality of message signals, each message signal having message data;

means for producing a base-chip-code signal, the base-chip-code signal for use in recovering the message data from a combined spread spectrum signal;

means to produce a transmitted message signal having base message data;

means for combining the base-chip-code signal and the base message signal as a combined signal; and

means for transmitting the combined signal as the combined spread spectrum signal.

14. The base station of claim 13, wherein:

the means for generating a base reference signal at the base station relays the reference signal, the base reference signal transmitted from the base station;

the base station spread-spectrum processes the base message data with the base reference signal, and combines the spread-spectrum-processed base message data with the base-reference signal as a base-CDMA signal; and

the base station transmits the base-CDMA signal over a communications channel to a remote station.

15. The base station of claim 13, wherein:

the means for generating a base reference signal at the base station uses the reference signal to set the timing for a different base reference signal, the base reference signal transmitted from the base station;

the base station spread-spectrum processes the base message data with the base reference signal, and combines the spread-spectrum-processed base message data with the base-reference signal as a base-CDMA signal; and

the base station transmits the base-CDMA signal over a communications channel to a remote station.