Transmitter and transmitting method increasing the flexibility of code assignment

Patent metadata

Field	Value
Publication number	US-RE46327-E
Application number	US-201313953084-A
Country	US
Kind code	E1
Filing date	Jul 29, 2013
Priority date	May 15, 1998
Publication date	Feb 28, 2017
Grant date	Feb 28, 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 data symbols to one or plural cells over a communication channel, comprising:
spreading each data symbol of the data symbols, using a spreader unit, with a respective associated spreading code generated by a tree structure, thereby producing a corresponding spread data symbol for each data symbol; wherein the associated spreading codes are mutually orthogonal; scrambling, using a scrambling unit, each spread data symbol with a respective associated scrambling code, thereby producing a corresponding scrambled symbol for each spread data symbol; and transmitting, using a transmitter in a cell, said corresponding scrambled symbol for each spread data symbol in different channels in a link, wherein the scrambling step provides a plurality of different scrambling codes in channels for spreading codes of a bit rate higher than voice data bit rate and provides the same scrambling code in channels for spreading codes of a voice data bit rate, the associated scrambling code being configured in conjunction with a set of spreading codes and the associated scrambling code being used in conjunction with said set of spreading codes, wherein the set of spreading codes maintains a different link in each of the plural cells.

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

17. The method according to claim 15, wherein each of a plurality of associated scrambling codes are non-mutually orthogonal.

18. The method according to claim 15, wherein each of a plurality of associated scrambling codes are mutually orthogonal.

19. The method according to claim 15, wherein each of a plurality of associated scrambling codes are generated simultaneously.

20. The method according to claim 15, wherein each of a plurality of associated scrambling codes are generated within the same link.

21. The method according to claim 15, wherein each of a plurality of associated scrambling codes are used with the same link.

Assignees

• Sony Deutschland Gmbh
• Sony Corp

Inventors

• Stirling-Gallacher Richard
• Jürgensen Jens-Uwe

Classifications

• H04B1/707

  using direct sequence modulation · CPC title

• 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

• H04L25/03866

  using scrambling · CPC title