Transmitter and transmitting method increasing the flexibility of code assignment

Patent metadata

Field	Value
Publication number	US-RE46477-E
Application number	US-201313952971-A
Country	US
Kind code	E1
Filing date	Jul 29, 2013
Priority date	May 15, 1998
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

According to the present invention a transmitter and a transmitting method for communicating data symbols over a communication channel, for example, according to the CDMA system is presented. The transmitter ( 24, 25 ) comprises means ( 9 ) for spreading each data symbol with a respective spreading code, wherein the spreading codes are mutually orthogonal. Means ( 10 ) for scrambling are provided to scramble each spread symbol with a respective scrambling code, the scrambling codes respectively having the same length as the spreading codes. Furthermore, means ( 11 ) for the transmission of the spread and scrambled symbols are provided. According to the present invention the means ( 10 ) for scrambling are provided with a plurality of different scrambling codes, which can be used simultaneously within the same link.

First claim

What is claimed is:

1. Transmitter for communicating data symbols over a communication channel, the transmitter comprising:
means for spreading each data symbol with a respective spreading code, wherein the spreading codes are mutually orthogonal, means for scrambling each spread symbol with a respective scrambling code, the scrambling codes respectively having the same length as the spreading codes, and means for transmitting said spread and scrambled symbols, wherein the means for scrambling are provided with a plurality of different scrambling codes which can be used simultaneously within the same link.

2. Transmitter according to claim 1 , characterized in that the means for scrambling can use different scrambling codes for an uplink communication channel and a downlink communication channel, respectively.

3. Transmitter according claim 1 , characterized in that the spreading codes are obtained by means of a code tree.

4. Transmitter according to claim 1 , characterized in that only in a downlink communication channel different scrambling codes are used, wherein in an uplink channel only one scrambling code is used.

5. Transmitter according to claim 1 , characterized in that the means for scrambling use different scrambling codes within the same link only for channels demanding a high bit rate.

6. Transmitter according to claim 5 , characterized in that the means for scrambling use different scrambling codes within the same link only video channels.

7. Wireless transmission system, comprising:
means for spreading each data symbol with a respective spreading code, wherein the spreading codes are mutually orthogonal, means for scrambling each spread symbol with a respective scrambling code, the scrambling codes respectively having the same length as the spreading codes, and means for transmitting said spread and scrambled symbols, wherein the means for scrambling are provided with a plurality of different scrambling codes which can be used simultaneously within the same link, and wherein a subset of scrambling codes is respectively allocated to a cell of the transmission system.

8. Wireless transmission system according to claim 7 , characterized in that different spreading codes are allocated to adjacent cells of the transmission system.

9. Method for the transmission of data symbols over a communication channel, comprising the following steps:
spreading each data symbol with a respective spreading code, wherein the spreading codes are mutually orthogonal, scrambling each spread symbol with a respective scrambling code, the scrambling codes respectively having the same length as the spreading codes, and transmitting said spread and scrambled symbols, wherein the scrambling step provides a plurality of different scrambling codes which can be used simultaneously within the same link.

10. Method according to claim 9 , characterized in that in the step of scrambling different scrambling codes can be used for an uplink communication channel and a downlink communication channel, respectively.

11. Method according to claim 9 , characterized in that the spreading codes are obtained by means of a code tree.

12. Method according to claim 9 , characterized in that only in a downlink communication channel different scrambling codes are used, wherein in an uplink channel only one scrambling code is used.

13. Method according to claim 9 , characterized in that different scrambling codes within the same link are used only for channels demanding a high bit rate.

14. Method according to claim 13 , characterized in that different scrambling codes within the same link are used only for video channels.

15. A method for transmitting one or more data symbols over first and second communication channels in an uplink or a downlink, comprising:
spreading for the first and second communication channels each of the one or more data symbols using a spreader unit, with one or more associated spreading codes to produce a corresponding spread data symbol for each data symbol for the first and second communication channels, respectively, wherein the one or more associated spreading codes are mutually orthogonal; scrambling, using a scrambling unit, each spread data symbol of the first communication channel with a respective scrambling code to produce corresponding mutually orthogonal scrambled symbols for the first communication channel; scrambling, using a scrambling unit, each spread data symbol of the second communication channel with a respective scrambling code to produce corresponding mutually orthogonal scrambled symbols for the second communication channel; assigning a plurality of mutually orthogonal scrambled codes to one user, wherein different scrambling codes are used for the first and second communication channels in a link for transmitting data symbols at a data bit rate higher than voice data bit rate, and the same scrambling code is used for the first and second communication channels in a link for transmitting data symbols at a voice data bit rate; wherein a resulting data rate is spread over two or more of the plurality of mutually orthogonal scrambled codes in the single communication channel; and transmitting, using a transmitter, each corresponding scrambled symbol.

16. The method according to claim 15, wherein the one or more associated scrambling code does not effect a band rate of the transmission.

17. The method according to claim 15, wherein at least one of the one or more associated scrambling codes has the same length of an associated spreading code.

18. The method according to claim 15, wherein the different scrambling codes are a subset of available scrambling codes.

19. The method according to claim 15, wherein the associated spreading code is based on a data rate.

20. The method according to claim 15, wherein the associated spreading code is based on a service requirement.

Assignees

• Sony Deutschland Gmbh
• Sony Corp

Inventors

• Stirling-Gallacher Richard
• Jürgensen Jens-Uwe

Classifications

• H04B7/2628

  using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] (H04B7/2618 takes precedence) · CPC title

• H04J13/004 Primary

  Orthogonal · CPC title

• H04B1/707

  using direct sequence modulation · CPC title

• H04L25/03866

  using scrambling · CPC title