Methods and apparatus for providing non-uniform de-multiplexing in a multi-carrier wide band CDMA system

• US 6,353,626 B1
• Filed: 05/04/1998
• Issued: 03/05/2002
• Est. Priority Date: 05/04/1998
• Status: Expired due to Fees

• Current Assignee: Nokia Mobile Phones UK Limited (Nokia Corporation)
• Original Assignee: Nokia Mobile Phones UK Limited (Nokia Corporation)
• Inventors: Sunay, Oguz, Kahtava, Jussi
• Primary Examiner(s): Pham, Chi
• Assistant Examiner(s): Tran, Khai
• Application Number:
  US09/072,217
• Time in Patent Office: 1,401 Days
• Field of Search: 375/130, 375/146, 375/131, 370/335, 370/342, 370/468, 455/442, 455/436
• US Class Current: 375/130
• CPC Class Codes: H04L 5/026 using code division
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks

Abstract

A wireless telecommunications system that includes at least one base station, at least one mobile station, and a data distribution system in the base station for non-uniformly distributing data amongst a plurality of subchannels that are overlaid upon underlying channels before transmission of the plurality of subchannels to the mobile station. The data distribution system non-uniformly distributes the data in accordance with a total load that is already present in each of the subchannels due to the presence of the underlying channels.

Claims

1. A wideband spread spectrum code division multiple access wireless telecommunications system, comprising:

at least one base station;

at least one mobile station; and

a data distribution system in said base station for non-uniformly distributing data amongst a plurality of subchannels that are overlaid upon narrower bandwidth underlying channels before transmission of said plurality of subchannels to said mobile station, said data distribution system non-uniformly distributing the data in accordance with a total load that is already present in each of the subchannels due to the presence of the underlying channels.

2. A multi-channel wireless communication system of a type utilizing a first spread spectrum communication subsystem with a plurality of subchannels capable of being overlaid upon one or more channels of a second spread spectrum communication subsystem, comprising in a transmission station thereof:

a data distributor for distributing information signals non-uniformly amongst said subchannels based upon a plurality of criteria; and

coupled to outputs of said data distributor, circuitry for spreading and transmitting said information signals to said plurality of subchannels;

wherein said plurality of criteria are comprised of a first noise-related factor N₀ and a plurality of second noise-related factors N_2G, wherein the first noise-related factor N₀ is independent of information signals transmitted within said overlaid channels, and wherein individual ones of the plurality of second factors N_2G are dependent upon information signals transmitted within individual ones of said overlaid channels.

3. A multi-channel wireless communication system as in claim 2, wherein said first spread spectrum subsystem has a wider transmission bandwidth than said second spread spectrum subsystem.

4. A multi-channel wireless communication system as in claim 2, wherein said plurality of subchannels have a set of carrier frequencies with bandwidth overlapping one another.

5. A multi-channel wireless communication system as in claim 2, wherein said plurality of subchannels have a set of carrier frequencies with bandwidth that do not overlap one another. $f_i=\frac{r·}{}$

(N0+1M-1

 



∑

j=1M

N2

G-j)(M·

N0+∑

j=1M

N2

G-j)

6. A multi-channel wireless communication system as in claim 2, wherein said data distributor is controlled by a controller that operates with static criteria over an interval of time.

7. A multi-channel wireless communication system as in claim 2, wherein said data distributor is controlled by a controller that operates with dynamic criteria that vary as the loading of said overlaid channels varies over an interval of time.

8. A multi-channel wireless communication system of a type utilizing a first spread spectrum communication subsystem with a plurality of subchannels capable of being overlaid upon one or more channels of a second spread spectrum communication subsystem, comprising in a transmission station thereof:

a data distributor for distributing information signals non-uniformly amongst said subchannels based upon a plurality of criteria, wherein said data distributor operates with a set of symbol transmission rates f_i for an ith channel, which is dependent upon;

a positive integer M which denotes a total number of subchannels, said first noise related factor N₀, said second factors N_2G, and a desired total transmission rate r, in accordance with $f_i=\frac{r·<br><br>\left(N_0+\frac{1}{M-1}<br><br>\text{\hspace{1em}<br><br>}<br><br>\underset{j=1}{\overset{M}{\sum <br><br>}}<br><br>N_{2<br><br>G-j}\right)}{\left(M·<br><br>N_0+\underset{j=1}{\overset{M}{\sum <br><br>}}<br><br>N_{2<br><br>G-j}\right)}$

wherein in the summation constituting part of the numerator, the j'"'"'s do not include i; and

coupled to outputs of said data distributor, circuitry for spreading and transmitting said information signals to said plurality of subchannels;

wherein said plurality of criteria are comprised of a first noise-related factor N₀ and a plurality of second noise-related factors N_2G, wherein the first noise-related factor N₀ is independent of information signals transmitted within said overlaid channels, and wherein individual ones of the plurality of second factors N_2G are dependent upon information signals transmitted within individual ones of said overlaid channels.

9. A method for use in a multi-channel wireless communication system of a type utilizing a first spread spectrum communication subsystem with a plurality of subchannels capable of being overlaid upon channels of a second spread spectrum communication subsystem, comprising steps of:

distributing information signals non-uniformly amongst said subchannels based upon a plurality of criteria; and

spreading and transmitting said information signals to said plurality of subchannels;

wherein said plurality of criteria are comprised of a first noise-related factor N₀ and said second noise-related factor N_2G, wherein the first noise-related factor N₀ is independent of information signals transmitted within said overlaid channels, and wherein the second factor N_2G is dependent upon information signals transmitted within said overlaid channels.

10. A method as in claim 9, wherein said first spread spectrum subsystem has wider transmission bandwidth than said second spread spectrum subsystem.

11. A method as in claim 9, wherein said plurality of subchannels have a set of carrier frequencies with bandwidth overlapping one another.

12. A method as in claim 9, wherein said plurality of subchannels have a set of carrier frequencies with bandwidth that do not overlap one another.

13. A method as in claim 9, wherein said step of distributing operates with static criteria over an interval of time.

14. A method as in claim 9, wherein said step of distributing operates with dynamic criteria that vary as the loading of said overlaid channels varies over an interval of time.

15. A method for use in a multi-channel wireless communication system of a type utilizing a first spread spectrum communication subsystem with a plurality of subchannels capable of being overlaid upon channels of a second spread spectrum communication subsystem, comprising steps of:

distributing information signals non-uniformly amongst said subchannels based upon a plurality of criteria, wherein the step of distributing operates with a set of symbol transmission rates f_i for an ith channel, which is dependent upon;

a positive integer M which denotes denotes a total number of subchannels, said first noise related factor N₀, said second factor N_2G, and a desired total transmission rate r, in accordance with $f_i=\frac{r·<br><br>\left(N_0+\frac{1}{M-1}<br><br>\text{\hspace{1em}<br><br>}<br><br>\underset{j=1}{\overset{M}{\sum <br><br>}}<br><br>N_{2<br><br>G-j}\right)}{\left(M·<br><br>N_0+\underset{j=1}{\overset{M}{\sum <br><br>}}<br><br>N_{2<br><br>G-j}\right)}$

wherein in the summation constituting part of the numerator, the j'"'"'s do not include i; and

spreading and transmitting said information signals to said plurality of subchannels;

wherein said plurality of criteria are comprised of a first noise-related factor N₀ and said second noise-related factor N_2G, wherein the first noise-related factor N₀ is independent of information signals transmitted within said overlaid channels, and wherein the second factor N_2G is dependent upon information signals transmitted within said overlaid channels.

16. A spread spectrum code division multiple access wireless telecommunications system, comprising:

at least one base station;

a plurality of mobile stations located in a region served by said at least one base station; and

a transmitted data distribution system in said base station for non-uniformly distributing information bits to be transmitted amongst X first spread spectrum system channels, at least one of said X channels coexisting with a second spread spectrum system channel, said data distribution system non-uniformly distributing the information bits in accordance with a first noise factor that is substantially independent of transmitted information bits and X second noise factors individual ones of which are associated with information bits being transmitted in one of said X first spread spectrum channels.