Coding apparatus and method in a CDMA mobile communication system

• US 20030095532A1
• Filed: 11/21/2002
• Published: 05/22/2003
• Est. Priority Date: 11/21/2001
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Hwang, Sung-Oh, Kim, Jae-Yoel, Lee, Hyun-Woo
• Granted Patent: US 7,333,546 B2
• Time in Patent Office: Days
• US Class Current: 370/342
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04J 13/10 Code generation
• CPC Class Codes: H04L 1/0028 Formatting
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0045 Arrangements at the receiver end
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/0069 Puncturing patterns
• CPC Class Codes: H04L 1/0073 Special arrangements for feedback channel
• CPC Class Codes: H04L 1/16 in which the return channel carries supervisory signals, e.g. repetition request signals
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]

Abstract

In a mobile communication system, a coding apparatus receives 5 information bits and generates a code symbol stream comprised of 20 coded symbols. The coding apparatus generates 5 coded symbol streams having a length 32 by encoding the 5 individual information bits with different Walsh codes having a length 32, and generates a coded symbol stream comprised of 32 coded symbols by XORing the 5 coded symbol streams in a symbol unit. Further, the coding apparatus generates a code symbol stream comprised of 20 coded symbols by puncturing 2^nd, 4^th, 5^th, 6^th, 8^th, 9^th, 10^th, 11^th, 12^th, 13^th, 14^th, and 30^th coded symbols among the 32 coded symbols.

Claims

1. A coding method in a mobile communication system, for receiving 5 information bits and generating a coded symbol stream comprised of 20 coded symbols, the coding method comprising the steps of:

generating 5 coded symbol streams having a length 32 by encoding each of the 5 information bits with a different Walsh code each having a length 32, and generating a coded symbol stream comprised of 32 coded symbols by XORing the 5 coded symbol streams in a symbol unit; and

generating a coded symbol stream comprised of 20 coded symbols by puncturing 2^nd, 4^th, 5^th, 6^th, 8^th, 9^th, 10^th, 11^th, 12^th, 13^th, 14^th, and 30^th coded symbols among the 32 coded symbols.

2. The coding method of claim 1, wherein the information bits include information indicating a condition of a downlink channel supporting high-speed downlink packet access (HSDPA).

3. The coding method of claim 1, wherein the information bits include information indicating a modulation technique and a data rate, mapped according to a condition of a downlink channel supporting HSDPA.

4. The coding method of claim 1, wherein the code symbol stream comprised of 20 coded symbols is transmitted over a secondary uplink dedicated physical control channel (S-UL_DPCCH) along with a 10-bit response signal responsive to packet data received over the downlink channel.

5. The coding method of claim 4, wherein the downlink channel is a downlink dedicated physical channel.

6. A coding apparatus in a mobile communication system, for receiving 5 input information bits, generating 5 coded symbol streams having a length 32 by encoding each of the 5 input information bits with a different Walsh code each having a length 32, and generating a coded symbol stream comprised of 32 coded symbols by XORing the 5 coded symbol streams in a symbol unit, thereby to generate a code symbol stream comprised of 20 coded symbols, the coding apparatus comprising:

a puncturer for generating a code symbol stream comprised of 20 coded symbols by puncturing 2^nd, 4^th, 5^th, 6^th, 8^th, 9^th, 10^th, 11^th, 12^th, 13^th, 14^th, and 30^th coded symbols among the 32 coded symbols.

7. The coding apparatus of claim 6, wherein the information bits include information indicating a condition of a downlink channel supporting high-speed downlink packet access (HSDPA).

8. The coding apparatus of claim 6, wherein the information bits include information indicating a modulation technique and a data rate, mapped according to a condition of a downlink channel supporting HSDPA.

9. The coding apparatus of claim 6, wherein the coded symbol stream comprised of 20 coded symbols is transmitted over a secondary uplink dedicated physical control channel (S-UL_DPCCH) along with a 10-bit response signal responsive to packet data received over the downlink channel.

10. The coding apparatus of claim 9, wherein the downlink channel is a downlink dedicated physical channel.

11. A decoding method in a mobile communication system, for receiving a code symbol stream comprised of 20 coded symbols and generating 5 information bits from the coded symbol stream, the decoding method comprising the steps of:

generating a code symbol stream comprised of 32 coded symbols by inserting 0s into positions of 2^nd, 4^th, 5^th, 6^th, 8^th, 9^th, 10^th, 11^th, 12^th, 13^th, 14^th, and 30^th coded symbols of the coded symbol stream;

measuring correlation values between each of Walsh codes W1, W2, W4, W8 and W16 having a length 32, and the 0-inserted coded symbol stream; and

generating the information bits from the measured correlation values.

12. The decoding method of claim 11, wherein the information bits include information indicating a condition of a downlink channel supporting high-speed downlink packet access (HSDPA).

13. The decoding method of claim 11, wherein the information bits include information indicating a modulation technique and a data rate, mapped according to a condition of a downlink channel supporting HSDPA.

14. The decoding method of claim 11, wherein the coded symbol stream comprised of 20 coded symbols is transmitted over a secondary uplink dedicated physical control channel (S-UL_DPCCH) along with a 10-bit response signal responsive to packet data received over the downlink channel.

15. The decoding method of claim 14, wherein the downlink channel is a downlink dedicated physical channel.

16. A decoding apparatus in a mobile communication system, for receiving a coded symbol stream comprised of 20 coded symbols and generating 5 information bits from the coded symbol stream, the decoding apparatus comprising:

a zero (0) inserter for generating a coded symbol stream comprised of 32 coded symbols by inserting 0s into positions of 2^nd, 4^th, 5^th, 6^th, 8^th, 9^th, 10^th, 11^th, 12^th, 13^th, 14^th, and 30^th coded symbols of the coded symbol stream;

a correlation calculator for measuring correlation values between individual Walsh codes W1, W2, W4, W8 and W16 having a length 32, and the 0-inserted coded symbol stream; and

a correlation comparator for generating the information bits from the measured correlation values.

17. The decoding apparatus of claim 16, wherein the information bits include information indicating a condition of a downlink channel supporting high-speed downlink packet access (HSDPA).

18. The decoding apparatus of claim 16, wherein the information bits include information indicating a modulation technique and a data rate, mapped according to a condition of a downlink channel supporting HSDPA.

19. The decoding apparatus of claim 16, wherein the code symbol stream comprised of 20 coded symbols is transmitted over a secondary uplink dedicated physical control channel (S-UL DPCCH) along with a 10-bit response signal responsive to packet data received over the downlink channel.

20. The decoding apparatus of claim 19, wherein the downlink channel is a downlink dedicated physical channel.

21. A coding method in a mobile communication system, for receiving 5 information bits indicating a quality of a downlink channel supporting high-speed downlink packet access (HSDPA) and generating a coded symbol stream comprised of 20 coded symbols, the coding method comprising the steps of:

generating 5 code symbol streams having a length 32 by encoding each of the 5 information bits with a different Walsh code W1, W2, W4, W8 and W16, and generating a coded symbol stream comprised of 32 coded symbols by XORing the 5 coded symbol streams in a symbol unit; and

generating a code symbol stream comprised of 20 coded symbols by puncturing 2^nd, 4^th, 5^th, 6^th, 8^th, 9^th, 10^th, 11^th, 12^th, 13^th, 14^th, and 30^th coded symbols among the 32 coded symbols.

22. A decoding method in a mobile communication system, for receiving a coded symbol stream comprised of 20 coded symbols and generating 5 information bits indicating a quality of a downlink channel supporting high-speed downlink packet access (HSDPA) from the coded symbol stream, the decoding method comprising the steps of:

generating a code symbol stream comprised of 32 coded symbols by inserting 0s into positions of 2^nd, 4^th, 5^th, 6^th, 8^th, 9^th, 10^th, 11^th, 12^th, 13^th, 14^th, and 30^th coded symbols of the code symbol stream;

measuring correlation values between individual Walsh codes W1, W2, W4, W8 and W16 having a length 32, and the 0-inserted coded symbol stream; and

generating the information bits from the measured correlation values.