METHOD OF UTILIZING AND MANIPULATING WIRELESS RESOURCES FOR EFFICIENT AND EFFECTIVE WIRELESS COMMUNICATION

• US 20070268977A1
• Filed: 05/21/2007
• Published: 11/22/2007
• Est. Priority Date: 05/19/2006
• Status: Abandoned Application

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Sun, Li-Hsiang, Kim, Sang, Wang, Shu, Yoon, Young, Lee, Suk, Kim, Ho, Yi, Byung, Kwon, Soon
• Application Number:
  US11/751,512
• Publication Number:
  US 20070268977A1
• Time in Patent Office: Days
• US Class Current: 375/261
• CPC Class Codes: H04L 27/183 Multiresolution systems
• CPC Class Codes: H04L 27/2604 Multiresolution systems by means of multiresolution subcarriers H04L27/183, H04L27/3488
• CPC Class Codes: H04L 27/3488 Multiresolution systems
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0021 in which codes are applied as a frequency-domain sequences, e.g. MC-CDMA

Abstract

A method of allocating symbols in a wireless communication system is disclosed. More specifically, the method includes receiving at least one data stream from at least one user, grouping the at least one data streams into at least one group, wherein each group is comprised of at least one data stream, preceding each group of data streams in multiple stages, and allocating the precoded symbols.

Claims

1. A method of allocating symbols in a wireless communication system, the method comprising:

receiving at least one data stream from at least one user;

grouping the at least one data streams into at least one group, wherein each group is comprised of at least one data stream;

preceding each group of data streams in multiple stages; and

allocating the precoded symbols.

2. The method of claim 1, wherein the each group of data streams is precoded independently.

3. The method of claim 2, wherein the each group of data stream is precoded independently using independent rotation matrix.

4. The method of claim 1, wherein the each group of data streams is precoded jointly.

5. The method of claim 4, wherein the each group of data streams is precoded jointly using a single rotation matrix.

6. The method of claim 1, wherein the precoding in multiple stages include applying independent spreading matrix to each group.

7. The method of claim 1, wherein the preceding includes at least one of phase adjustment or amplitude adjustment.

8. The method of claim 1, wherein the wireless communication system is any one of orthogonal frequency division multiplexing (OFDM) system, orthogonal frequency division multiple access (OFDMA) system, multi-carrier code division multiplexing (MC-CDM), or multi-carrier code division multiple access (MC-CDMA).

9. The method of claim 1, further comprising modulating the allocated symbols using an inverse fast Fourier transform (IFFT) or an inverse discrete Fourier transform (IDFT).

10. A method of performing hierarchical modulation signal constellation in a wireless communication system, the method comprising allocating multiple symbols according to a bits-to-symbol mapping rule representing different signal constellation points with different bits, wherein the mapping rule represents one (1) or less bit difference between closest two symbols.

11. The method of claim 10, wherein the multiple symbols have different initial modulation phase.

12. The method of claim 10, wherein the hierarchical modulation signal constellation includes one base layer signal constellation and at least one enhancement layer signal constellation.

13. The method of claim 12, wherein the mapping rule applied to the enhancement layer is selected from a pool of all possible enhancement layer mapping rules which is based on each base layer symbol position.

14. The method of claim 10, wherein the hierarchical modulation signal constellation includes one base layer signal constellation and at least one enhancement layer signal constellation and the mapping rule represented by a bit-to-symbol mapping rule.

15. The method of claim 10, further comprising multiplexing the bits for base layer symbol and the bits for enhancement layer symbol using interleaving or concatenating techniques.

16. The method of claim 10, further comprising:

grouping the symbols, each group having the same signal strength; and

selecting the each group from a pool of mapping rules according to the bits-to-symbol mapping rule applied to other groups.

17. The method of claim 10, wherein the modulation schemes include phase shift keying (PSK), rotated-PSK, quadrature phase shift keying (QPSK), rotated-QPSK, 8-PSK, rotated 8-PSK, 16 quadrature amplitude modulation (16 QAM), and rotated-16 QAM.

18. The method of claim 10, wherein the bits-to-symbol mapping m/e is Gray mapping rule.

19. A method of transmitting more than one signal in a wireless communication system, the method comprising:

allocating multiple symbols to a first signal constellation and to a second constellation, wherein the first signal constellation refers to base layer signals and the second signal constellation refers to enhancement layer signals;

modulating the multiple symbols of the first signal constellation and the second signal constellation; and

transmitting the modulated symbols.

20. The method of claim 19, wherein the base layer signals and the enhancement layer signals have initial modulation and transmission phase that are the same.

21. The method of claim 19, wherein the base layer signals and the enhancement layer signals have initial modulation and transmission phase that are different.

22. The method of claim 19, wherein the base layer signals and the enhancement layer signals have the same bits-to-symbol mapping rules.

23. The method of claim 19, wherein the base layer signals and the enhancement layer signals have different bits-to-symbol mapping rules.

24. The method of claim 19, wherein the transmitted modulated symbols apply bits-to-symbol mapping rule where each enhancement layer signal constellation is based on bits-to-symbol mapping rule for the base layer bits-to-symbol mapping rule and other enhancement bits-to-symbol mapping rule.