Method of setting spread code series and communication apparatus using spread spectrum communication method

• US 5,764,685 A
• Filed: 04/20/1995
• Issued: 06/09/1998
• Est. Priority Date: 04/26/1994
• Status: Expired due to Term

• Current Assignee: Uniden Corporation (Cornwall Capital Management LP)
• Original Assignee: Uniden Corporation (Cornwall Capital Management LP)
• Inventors: Tanaka, Kiyoshi, Zuo, Hong
• Primary Examiner(s): Bocure, Tesfaldet
• Application Number:
  US08/425,501
• Time in Patent Office: 1,146 Days
• Field of Search: 375/200, 375/257, 375/259, 375/208, 375/205, 375/206, 375/209, 375/210, 375/343, 379/61, 379/62, 455/426, 455/410
• US Class Current: 375/130
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04J 13/00 Code division multiplex systems for frequency hopping H04B1/713

Abstract

A spread code series setting apparatus which sets a spread code series used in a radio or radio communication system capable of performing communication according to spread spectrum method, and has a stationary communication unit such as the master unit of a cordless telephone, capable of setting a spread code series each time a predetermined condition is met and outputting resultant spread code series setting information, in addition to which said apparatus also has a movable unit such as a subordinate unit of a cordless telephone, capable of setting a spread code series based on the spread code series setting information transmitted from the stationary communication unit in which spread code series is set in accordance with a method which has a transmitting step in which a spread code series is set in a stationary communication unit each time a predetermined condition is met and the spread code series setting information concerning the set spread code series is transmitted, and a receiving step in which spread code series, derived from the spread code series setting information, is set in the movable unit.

Claims

1. A spread code series setting apparatus for setting a spread code series used in a radio communication system capable of performing communication according to spread spectrum, the spread code series setting apparatus comprising:

a stationary communication unit including a first spread code series memory for storing a plurality of spread code series, an address generating element for generating an address for said first spread code series memory, and a spread code series address outputting circuit for outputting said address; and

a movable unit including a second spread code series memory for storing the plurality of spread code series, a spread code series address receiving circuit for receiving said address outputted by said spread code series address outputting circuit, and a spread code series producing element for reading the received addressed from said second spread code series memory and producing a spread code series;

wherein said first and second spread code series memory have the same spread code series in the same address.

2. A spread code series setting apparatus according to claim 1, wherein said spread code series address outputting circuit outputs said address to said spread code series address receiving circuit through a connection between a terminal of said movable unit and a terminal of said stationary communication unit.

3. A spread code series setting apparatus according to claim 2, wherein the connection between the terminal of said movable unit and the terminal of said stationary communication unit is a part of a charging circuit for charging a battery of said movable unit from a power supply of said stationary communication unit.

4. A spread code series setting apparatus according to claim 1, wherein said spread code series address outputting circuit outputs said address to said spread code series address receiving circuit through a radio link.

5. A spread code series setting apparatus according to claim 1, wherein said spread code series producing element includes an arithmetic processing device which generates M spread code series by means of software using a generated polynomial.

6. A spread code series setting apparatus according to claim 1, wherein said address generating element generates the address based on a random number.

7. A spread code series setting apparatus according to claim 1, wherein said address generating element includes an arithmetic processing device which selects said predetermined address by generating said random number by software using generated polynomial.

8. A spread code series setting apparatus according to claim 1, wherein said address generating element includes a generating circuit which generates a random number, and wherein said generating circuit has a plurality of shift registers and an exclusive OR circuit.

9. A spread code series setting apparatus for setting a spread code series used in a radio communication system capable of performing communication according to spread spectrum, the spread code series setting apparatus comprising:

a stationary communication unit including a spread code series memory for storing the spread code series and a spread code series outputting circuit for outputting a spread code series data when detecting that a current spread code series is to be substituted for another spread code series, which is used for setting said spread code series; and

a movable unit including a spread code series receiving circuit for receiving said spread code series data, a spread code series producing element for producing a spread code series on the basis of the received spread code series data, a spread code series memory for storing the obtained spread code series and a control unit for controlling said spread code series producing element and said spread code series memory;

wherein said spread code series outputting circuit and said spread code series receiving circuit perform communication through either a radio link or a connection between a terminal of said stationary communication unit and a terminal of said movable unit;

wherein said control unit compares a first spread code series data through said radio link with a second spread code series data through said connection between the terminal of said stationary communication unit and the terminal of said movable unit and demands to transmit said spread code series data again when there is a discordance between said first spread code series data and said second spread code series data; and

wherein said spread code series producing element generates the spread code series when said first spread code series data is identical to said second spread code series data.

10. A spread code series setting apparatus according to claim 9, wherein said control unit compares the first spread code series data through said radio link with the second spread code series data through said connection between the terminal of said stationary communication unit and demands to transmit said spread code series data again of said stationary communication unit when there is a discordance between said first spread code series data and said second spread code series data.

11. A spread code series setting apparatus according to claim 9, wherein said spread code series memory of said stationary communication unit and said spread code series memory of said movable unit have the same spread code series in the same address and said spread code series data is an address of said spread code series memories.

12. A spread code series setting apparatus according to claim 9, wherein said stationary communication unit further comprises:

a detecting element for detecting that said current spread code series is to be substituted for another spread code series and generating a detection signal; and

a generating element for generating said another spread code series when said detecting element has detected that said current spread code series is to be substituted for another spread code series, and wherein said spread code series memory of said stationary communication unit stores the generated spread code series, and wherein said spread code series outputting circuit outputs said generated spread code series as said spread code series data.

13. A spread code series setting apparatus according to claim 12, wherein said detecting element of said stationary communication unit generates said detection signal in the case of detecting charging current supplied through a charging terminal to batteries of said movable unit.

14. A spread code series setting apparatus according to claim 12, wherein said detecting element of said stationary communication unit generates said detection signal when beginning or finishing a communication between said stationary communication unit and said movable unit.

15. A spread code series setting apparatus according to claim 12, wherein said spread code series producing element includes a generating circuit having, in combination, a plurality of shift registers and an exclusive OR circuit.

16. A spread code series setting apparatus for setting a spread code series used in a radio communication system capable of performing communication according to spread spectrum, the spread code series setting apparatus comprising:

a stationary communication unit including a detecting element for detecting that a current spread code series is to be substituted for another spread code series and generating a detection signal, a generating element for generating said spread code series when said detecting element has detected that the current spread code series is to be substituted for another spread code series, a first memory for storing the generated spread code series, a second memory for storing a basic spread code series, a spreading element for spreading said generated spread code series by said basic spread code series, and a spread code series outputting circuit for outputting a spread code series data which is spread by said spread element and;

a movable unit including a spread code series receiving circuit for receiving said spread code series data from said spread code series outputting circuit, a spread code series producing element for producing a spread code series on the basis of the received spread code series data, a spread code series memory for storing the obtained spread code series, and a control unit for controlling said spread code series producing element and said spread code series memory.

17. A spread code series setting apparatus according to claim 16, wherein said movable unit further comprises a memory for storing the same basic spread code series that said second memory of said stationary communication unit stores,

wherein said spread code series producing element despreading said received spread code series data by said same basic spread code series stored in said memory and producing said spread code series.

18. A spread code series setting method for setting spread code series to be used in a radio communication system capable of performing communication according to spread spectrum method, said setting method comprising:

a transmitting step including an address generating step for generating an address of a first spread code series memory which stores a plurality of spread code series and a spread code series address outputting step for outputting said address; and

a receiving step including a spread code series address receiving step for receiving said address outputted by said spread code series address outputting step and a spread code series producing step for producing a spread code series by reading a data from a second spread code series memory which stores a plurality of spread code series on the basis of said received address,

wherein said first and second spread code series memory have the same spread code series in the same address.

19. A spread code series setting method according to claim 18, wherein said generating step generates the address based on a random number, and wherein said transmitting step performs communication through a radio link.

20. A spread code series setting method according to claim 18, wherein said generating step generates the address based on a random number, and wherein said transmitting step performs communication through a connection between terminals.

21. A spread code series setting method for setting spread code series to be used in a radio communication system capable of performing communication according to spread spectrum method, said setting method comprising:

a transmitting step including a spread code series outputting step for outputting a spread code series data which is used for setting said spread code series when a current spread code series stored in a first spread code series memory is to be substituted for another spread code series; and

a receiving step including a spread code series receiving step for receiving said spread code series data, a spread code series producing step for producing a spread code series on the basis of said received spread code series data, a storing step for storing the obtained spread code series in a second spread code series memory, a resending step for demanding to transmit said spread code series data again and a control step for controlling said resending step,

wherein the communication is performed through both a radio link and a connection between terminals in said spread code series outputting step and said spread code series receiving step, and said control step compares a first spread code series data through said radio link with a second spread code series data through said connection between the terminals and demands to resend to said resending step when there is a discordance between said first spread code series data.

22. A spread code series setting method for setting spread code series to be used in a radio communication system capable of performing communication according to spread spectrum method, said setting method comprising:

a transmitting step including a detecting step for detecting that the current spread code series is to be substituted for another spread code series and generating a detection signal, a generating step for generating said another spread code series when said detecting step has detected that the current spread code series is to be substituted for another spread code series, a first storing step for storing the generated spread code series, a second storing step for storing a basic spread code series, a spreading step for spreading said generated spread code series by said basic spread code series and a spread code series outputting step for outputting a resultant spread code series data which is spread by said spreading step;

a receiving step including a spread code series receiving step for receiving said spread code series data, spread code series producing step for producing a spread code series on the basis of the received spread code series data and a spread code series storing step for storing the thus-obtained spread code series.

23. A spread code series setting method according to claim 22, wherein said transmitting step performs communication through a connection between terminals.

24. A spread code series setting method according to claim 22, wherein said transmitting step performs communication through a radio link.