Method and system for broadcasting via phase-shift keying modulation with multiple transmit antennas

• US 7,283,783 B2
• Filed: 11/26/2003
• Issued: 10/16/2007
• Est. Priority Date: 11/26/2002
• Status: Expired due to Fees

• Current Assignee: University of Florida (State University System of Florida)
• Original Assignee: University of Florida Research Foundation, Incorporated (State University System of Florida)
• Inventors: Wong, Wing Hin, Larsson, Erik G.
• Primary Examiner(s): Urban; Edward F.
• Assistant Examiner(s): Lee; John J.
• Application Number:
  US10/723,783
• Publication Number:
  US 20040161050A1
• Time in Patent Office: 1,420 Days
• Field of Search: 455/12.1, 455/13.2, 455/13.3, 455/15, 455/3.01, 455/414.4, 455/417, 455/24, 455/66.1, 455/562.1, 455/126, 455/3.06, 455/19, 455/500, 455/502, 455/507, 455/509, 455/561, 455/418, 370/389, 370/465, 370/395, 375/259, 375/267
• US Class Current: 455/3.01
• CPC Class Codes: H04L 1/0618 Space-time coding
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint
• CPC Class Codes: H04L 27/345 Modifications of the signal space to allow the transmission of additional information

Abstract

A method of broadcasting multi-layered information in a multi-antenna broadcasting system can include identifying at least a first and second layer of information to be transmitted. The first layer of information can be encoded for transmission using a first unitary code matrix and the second layer of information can be encoded for transmission using a second unitary code matrix. The first and second layers of the multi-layered information can be transmitted with the multi-antenna broadcasting system.

Claims

1. A method of broadcasting multi-layered information in a multi-antenna broadcasting system comprising:

identifying at least a first and second layer of information to be transmitted;

encoding the first layer of information for transmission, wherein encoding the first layer of information comprises differentially encoding a product of the first layer of information and a first unitary code matrix, U_b representing the first unitary code matrix and being selected from the set

$X_b=\left\{\left[\begin{array}{cc}1& 0\\ 0& 1\end{array}\right],\left[\begin{array}{cc}0& -1\\ 1& 0\end{array}\right],\left[\begin{array}{cc}0& 1\\ -1& 0\end{array}\right],\left[\begin{array}{cc}-1& 0\\ 0& -1\end{array}\right]\right\}$

such that the product of the first layer of information and the first unitary code matrix is defined by U_bε

X_b;

encoding the second layer of information for transmission, wherein the second layer of information is encoded using a second unitary code matrix different from the first unitary code matrix; and

transmitting the first and second layers of the multi-layered information with the multi-antenna broadcasting system.

2. The method of claim 1, said step of encoding the second layer of information comprising differentially encoding a product of the second layer of information and the second unitary code matrix.

3. The method of claim 2, wherein U_a represents the second unitary code matrix and is selected from the set

$X_a=\left\{\left[\begin{array}{cc}{\mathrm{e\; <li></li>}}^{\mathrm{i\pi <br><br>}<br><br><br><br>\mathrm{\lambda <br><br>}}& 0\\ 0& {\mathrm{e<br><br>}}^{\mathrm{i\pi <br><br>}<br><br><br><br>\mathrm{\gamma <br><br>}}\end{array}\right],\left[\begin{array}{cc}{\mathrm{e<br><br>}}^{\mathrm{i\pi <br><br>}<br><br><br><br>\mathrm{\gamma <br><br>}}& 0\\ 0& {\mathrm{e<br><br>}}^{\mathrm{i\pi <br><br>}<br><br><br><br>\mathrm{\lambda <br><br>}}\end{array}\right],\left[\begin{array}{cc}{\mathrm{e<br><br>}}^{-\mathrm{i\pi <br><br>}<br><br><br><br>\mathrm{\lambda <br><br>}}& 0\\ 0& {\mathrm{e<br><br>}}^{-\mathrm{i\pi <br><br>}<br><br><br><br>\mathrm{\gamma <br><br>}}\end{array}\right],\left[\begin{array}{cc}{\mathrm{e<br><br>}}^{-\mathrm{i\pi <br><br>}<br><br><br><br>\mathrm{\gamma <br><br>}}& 0\\ 0& {\mathrm{e<br><br>}}^{-\mathrm{i\pi <br><br>}<br><br><br><br>\mathrm{\lambda <br><br>}}\end{array}\right]\right\}$

such that the product of the second layer of information and the second unitary code matrix is defined by U_aε

χ

_a.

4. The method of claim 3, wherein the transmitted signal X at a time t is defined by X(t)=X(t−

1)U_b(t)U_a(t).

5. A multi-antenna system for broadcasting multi-layered information comprising:

means for identifying at least a first and second layer of information to be transmitted;

means for encoding the first layer of information for transmission, said means for encoding the first layer of information comprising means for differentially encoding a product of the first layer of information and a first unitary code matrix, U_b representing the first unitary code matrix and being selected from the set

$X_b=\left\{\left[\begin{array}{cc}1& 0\\ 0& 1\end{array}\right],\left[\begin{array}{cc}0& -1\\ 1& 0\end{array}\right],\left[\begin{array}{cc}0& 1\\ -1& 0\end{array}\right],\left[\begin{array}{cc}-1& 0\\ 0& -1\end{array}\right]\right\}$

such that the product of the first layer of information and the first unitary code matrix is defined by U_bε

χ

_b;

means for encoding the second layer of information for transmission, wherein the means for encoding the second layer of information encodes the second layer of information using a second unitary code matrix different from the first unitary code matrix; and

means for transmitting the first and second layers of the multi-layered information with the multi-antenna broadcasting system.

6. The system of claim 5, said means for encoding the second layer of information comprising means for differentially encoding a product of the second layer of information and the second unitary code matrix.

7. The system of claim 6, wherein U_a represents the second unitary code matrix and is selected from the set

$X_a=\left\{\left[\begin{array}{cc}{\mathrm{e\; <li></li>}}^{\mathrm{i<br><br>\pi <br><br>\lambda <br><br>}}& 0\\ 0& {\mathrm{e<br><br>}}^{\mathrm{i<br><br>\pi <br><br>\gamma <br><br>}}\end{array}\right],\left[\begin{array}{cc}{\mathrm{e<br><br>}}^{\mathrm{i<br><br>\pi <br><br>\gamma <br><br>}}& 0\\ 0& {\mathrm{e<br><br>}}^{\mathrm{i<br><br>\pi <br><br>\lambda <br><br>}}\end{array}\right],\left[\begin{array}{cc}{\mathrm{e<br><br>}}^{-\mathrm{i<br><br>\pi <br><br>\lambda <br><br>}}& 0\\ 0& {\mathrm{e<br><br>}}^{-\mathrm{i<br><br>\pi <br><br>\gamma <br><br>}}\end{array}\right],\left[\begin{array}{cc}{\mathrm{e<br><br>}}^{-\mathrm{i<br><br>\pi <br><br>\gamma <br><br>}}& 0\\ 0& {\mathrm{e<br><br>}}^{-\mathrm{i<br><br>\pi <br><br>\lambda <br><br>}}\end{array}\right]\right\}$

such that the product of the second layer of information and the second unitary code matrix is defined by U_aε

χ

_a.

8. The system of claim 7, wherein the transmitted signal X at a time t is defined by X(t)=X(t−

1)U_b(t)U_a(t).

9. A computer readable medium, having stored thereon a computer program having a plurality of code sections executable by a machine for causing the machine to perform the steps of:

identifying at least a first and second layer of information to be transmitted;

encoding the first layer of information for transmission using a first unitary code matrix;

said step of encoding the first layer of information comprising differentially encoding a product of the first layer of information and a first unitary code matrix, U_b representing the first unitary code matrix and being selected from the set

$X_b=\left\{\left[\begin{array}{cc}1& 0\\ 0& 1\end{array}\right],\left[\begin{array}{cc}0& -1\\ 1& 0\end{array}\right],\left[\begin{array}{cc}0& 1\\ -1& 0\end{array}\right],\left[\begin{array}{cc}-1& 0\\ 0& -1\end{array}\right]\right\}$

such that the product of the first layer of information and the first unitary code matrix is defined by U_bε

χ

_b;

encoding the second layer of information for transmission using a second unitary code matrix;

wherein the second layer of information is encoded using a second unitary code matrix different from the first unitary code matrix; and

transmitting the first and second layers of the multi-layered information with the multi-antenna broadcasting system.

10. The computer readable medium of claim 9, said step of encoding the second layer of information comprising differentially encoding a product of the second layer of information and the second unitary code matrix.

11. The computer readable medium of claim 10, wherein U_a represents the second unitary code matrix and is selected from the set

$X_a=\left\{\left[\begin{array}{cc}{\mathrm{e\; <li></li>}}^{\mathrm{i<br><br>\pi <br><br>\lambda <br><br>}}& 0\\ 0& {\mathrm{e<br><br>}}^{\mathrm{i<br><br>\pi <br><br>\gamma <br><br>}}\end{array}\right],\left[\begin{array}{cc}{\mathrm{e<br><br>}}^{\mathrm{i<br><br>\pi <br><br>\gamma <br><br>}}& 0\\ 0& {\mathrm{e<br><br>}}^{\mathrm{i<br><br>\pi <br><br>\lambda <br><br>}}\end{array}\right],\left[\begin{array}{cc}{\mathrm{e<br><br>}}^{-\mathrm{i<br><br>\pi <br><br>\lambda <br><br>}}& 0\\ 0& {\mathrm{e<br><br>}}^{-\mathrm{i<br><br>\pi <br><br>\gamma <br><br>}}\end{array}\right],\left[\begin{array}{cc}{\mathrm{e<br><br>}}^{-\mathrm{i<br><br>\pi <br><br>\gamma <br><br>}}& 0\\ 0& {\mathrm{e<br><br>}}^{-\mathrm{i<br><br>\pi <br><br>\lambda <br><br>}}\end{array}\right]\right\}$

such that the product of the second layer of information and the second unitary code matrix is defined by U_aε

χ

_a.

12. The computer readable medium of claim 11, wherein the transmitted signal X at a time t is defined by X(t)=X(t−

1)U_b(t)U_a(t).

13. A method of processing multi-layered information received from a multi-antenna broadcasting system comprising:

receiving a wireless transmission comprised of multi-layered information, wherein each layer of the information is encoded;

decoding at least a first layer of information from the wireless transmission, wherein decoding the first layer of information comprises differentially decoding a product of the first layer of information and a first unitary code matrix, U_b representing the first unitary code matrix and being selected from the set

$X_b=\left\{\left[\begin{array}{cc}1& 0\\ 0& 1\end{array}\right],\left[\begin{array}{cc}0& -1\\ 1& 0\end{array}\right],\left[\begin{array}{cc}0& 1\\ -1& 0\end{array}\right],\left[\begin{array}{cc}-1& 0\\ 0& -1\end{array}\right]\right\}$

such that the product of the first layer of information and the first unitary code matrix is defined by U_bε

χ

_b;

decoding a second layer of information from the wireless transmission;

wherein the second layer of information is decoded using a second unitary code matrix different from the first unitary code matrix; and

presenting the decoded information.

14. The method of claim 13, said step of decoding the second layer of information comprising differentially decoding a product of the second layer of information and the second unitary code matrix.

15. The method of claim 14, wherein U_a represents the unitary code matrix and is selected from the set

$X_a=\left\{\left[\begin{array}{cc}{\mathrm{e\; <li></li>}}^{\mathrm{i<br><br>\pi <br><br>\lambda <br><br>}}& 0\\ 0& {\mathrm{e<br><br>}}^{\mathrm{i<br><br>\pi <br><br>\gamma <br><br>}}\end{array}\right],\left[\begin{array}{cc}{\mathrm{e<br><br>}}^{\mathrm{i<br><br>\pi <br><br>\gamma <br><br>}}& 0\\ 0& {\mathrm{e<br><br>}}^{\mathrm{i<br><br>\pi <br><br>\lambda <br><br>}}\end{array}\right],\left[\begin{array}{cc}{\mathrm{e<br><br>}}^{-\mathrm{i<br><br>\pi <br><br>\lambda <br><br>}}& 0\\ 0& {\mathrm{e<br><br>}}^{-\mathrm{i<br><br>\pi <br><br>\gamma <br><br>}}\end{array}\right],\left[\begin{array}{cc}{\mathrm{e<br><br>}}^{-\mathrm{i<br><br>\pi <br><br>\gamma <br><br>}}& 0\\ 0& {\mathrm{e<br><br>}}^{-\mathrm{i<br><br>\pi <br><br>\lambda <br><br>}}\end{array}\right]\right\}$

such that the product of the second layer of information and the second unitary code matrix is defined by U_aε

χ

_a.

16. The method of claim 15, wherein the wireless transmission X at a time t is defined by X(t)=X(t−

1)U_b(t)U_a(t).

17. A system for processing multi-layered information received from a multi-antenna broadcasting system comprising:

means for receiving a wireless transmission comprised of multi-layered information, wherein each layer of the information is encoded;

means for decoding at least a first layer of information from the wireless transmission, said means for decoding the first layer of information comprising means for differentially decoding a product of the first layer of information and a first unitary code matrix, U_b representing the first unitary code matrix and being selected from the set

$X_b=\left\{\left[\begin{array}{cc}1& 0\\ 0& 1\end{array}\right],\left[\begin{array}{cc}0& -1\\ 1& 0\end{array}\right],\left[\begin{array}{cc}0& 1\\ -1& 0\end{array}\right],\left[\begin{array}{cc}-1& 0\\ 0& -1\end{array}\right]\right\}$

such that the product of the first layer of information and the first unitary code matrix is defined by U_bε

χ

_b;

means for decoding a second layer of information from the wireless transmission, wherein the second layer of information is decoded using a second unitary code matrix different from the first unitary code matrix; and

means for presenting the decoded information.

18. The system of claim 17, said means for decoding the second layer of information comprising means for differentially decoding a product of the second layer of information and the second unitary code matrix.

19. The system of claim 18, wherein U_a represents the second unitary code matrix and is selected from the set

$X_a=\left\{\left[\begin{array}{cc}{\mathrm{e\; <li></li>}}^{\mathrm{i<br><br>\pi <br><br>\lambda <br><br>}}& 0\\ 0& {\mathrm{e<br><br>}}^{\mathrm{i<br><br>\pi <br><br>\gamma <br><br>}}\end{array}\right],\left[\begin{array}{cc}{\mathrm{e<br><br>}}^{\mathrm{i<br><br>\pi <br><br>\gamma <br><br>}}& 0\\ 0& {\mathrm{e<br><br>}}^{\mathrm{i<br><br>\pi <br><br>\lambda <br><br>}}\end{array}\right],\left[\begin{array}{cc}{\mathrm{e<br><br>}}^{-\mathrm{i<br><br>\pi <br><br>\lambda <br><br>}}& 0\\ 0& {\mathrm{e<br><br>}}^{-\mathrm{i<br><br>\pi <br><br>\gamma <br><br>}}\end{array}\right],\left[\begin{array}{cc}{\mathrm{e<br><br>}}^{-\mathrm{i<br><br>\pi <br><br>\gamma <br><br>}}& 0\\ 0& {\mathrm{e<br><br>}}^{-\mathrm{i<br><br>\pi <br><br>\lambda <br><br>}}\end{array}\right]\right\}$

such that the product of the second layer of information and the second unitary code matrix is defined by U_aε

χ

_a.

20. The system of claim 19, wherein the wireless transmission X at a time t is defined by X(t)=X(t−

1)U_b(t)U_a(t).

21. A computer readable medium, having stored thereon a computer program having a plurality of code sections executable by a machine for causing the machine to perform the steps of:

receiving a wireless transmission comprised of multi-layered information, wherein each layer of the information is encoded;

decoding at least a first layer of information from the wireless transmission, wherein the first layer of information is decoded using a first unitary code matrix decoding the first layer of information comprising differentially decoding a product of the first layer of information and a first unitary code matrix, U_b representing the unitary code matrix and being selected from the set

$X_b=\left\{\left[\begin{array}{cc}1& 0\\ 0& 1\end{array}\right],\left[\begin{array}{cc}0& -1\\ 1& 0\end{array}\right],\left[\begin{array}{cc}0& 1\\ -1& 0\end{array}\right],\left[\begin{array}{cc}-1& 0\\ 0& -1\end{array}\right]\right\}$

such that the product of the first layer of information and the first unitary code matrix is defined U_bε

χ

_b;

decoding a second layer of information from the wireless transmission, wherein the second layer of information is decoded using a second unitary code matrix different from the first unitary code matrix; and

presenting the decoded information.

22. The computer readable medium of claim 21, said step of decoding the second layer of information comprising differentially decoding a product of the second layer of information and the second unitary code matrix.

23. The computer readable medium of claim 22, wherein U_a represents the second unitary code matrix and is selected from the set

$X_a=\left\{\left[\begin{array}{cc}{\mathrm{e\; <li></li>}}^{\mathrm{i<br><br>\pi <br><br>\lambda <br><br>}}& 0\\ 0& {\mathrm{e<br><br>}}^{\mathrm{i<br><br>\pi <br><br>\gamma <br><br>}}\end{array}\right],\left[\begin{array}{cc}{\mathrm{e<br><br>}}^{\mathrm{i<br><br>\pi <br><br>\gamma <br><br>}}& 0\\ 0& {\mathrm{e<br><br>}}^{\mathrm{i<br><br>\pi <br><br>\lambda <br><br>}}\end{array}\right],\left[\begin{array}{cc}{\mathrm{e<br><br>}}^{-\mathrm{i<br><br>\pi <br><br>\lambda <br><br>}}& 0\\ 0& {\mathrm{e<br><br>}}^{-\mathrm{i<br><br>\pi <br><br>\gamma <br><br>}}\end{array}\right],\left[\begin{array}{cc}{\mathrm{e<br><br>}}^{-\mathrm{i<br><br>\pi <br><br>\gamma <br><br>}}& 0\\ 0& {\mathrm{e<br><br>}}^{-\mathrm{i<br><br>\pi <br><br>\lambda <br><br>}}\end{array}\right]\right\}$

such that the product of the second layer of information and the second unitary code matrix is defined by U_aε

χ

_a.

24. The computer readable medium of claim 23, wherein the wireless transmission X at a time t is defined by X(t)=X(t−

1)U_b(t)U_a(t).