Method and Apparatus for Decoding Transmission Signals in a Wireless Communication System

• US 20080279297A1
• Filed: 12/29/2006
• Published: 11/13/2008
• Est. Priority Date: 12/29/2005
• Status: Active Grant

• Current Assignee: Technology In Ariscale, LLC
• Original Assignee: Posdata Company Limited
• Inventors: Lee, Kang-Min, Kang, Sung-Jin
• Granted Patent: US 8,139,652 B2
• Time in Patent Office: Days
• US Class Current: 375/260
• CPC Class Codes: H04L 1/0054 Maximum-likelihood or sequential decoding, e.g. Viterbi, Fano, ZJ algorithms
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 1/0072 Error control for data other than payload data, e.g. control data
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01

Abstract

Disclosed is a method and an apparatus for decoding transmission signal. The method includes the steps of: receiving transmission signal including repeated symbols; deinterleaving the received signal; mutually combining the repeated symbols in the deinterleaved signal; and decoding the combined symbols. According to the method, reception performance is improved as compared to a conventional decoding method, and system performance is improved by reducing the loss of frame information included in an FCH.

Claims

1. A method for decoding transmission signal, the method comprising the steps of:

receiving the transmission signal including repeated symbols;

deinterleaving the received signal;

mutually combining the repeated symbols in the deinterleaved signal; and

decoding the combined symbols.

3. The method as claimed in claim 1 or 2, wherein the repeated symbols included in the transmission signal are formed through a repetition process of symbols before encoding in a transmitter.

4. The method as claimed in claim 3, wherein the repeated symbols correspond to information transmitted using an FCH.

5. The method as claimed in claim 4, wherein the repeated symbols include configuration information of a corresponding frame.

6. The method as claimed in claim 3, wherein the step of mutually combining the repeated symbols comprises adding and averaging the repeated symbols each other.

7. The method as claimed in claim 6, further comprising the step of;

repeating the averaged symbols after averaging the repeated symbols.

8. The method as claimed in claim 3, wherein the transmission signal is a downlink signal in an IEEE 802.16e-based wireless communication system.

9. The method as claimed in claim 8, wherein the IEEE 802.16e-based wireless communication system employs OFDMA and TDD schemes.

2. A method for decoding transmission signal, the method comprising the steps of:

receiving transmission signal including repeated symbols;

mutually combining the repeated symbols in the received signal;

deinterleaving the combined symbols; and

decoding the deinterleaved symbols.

10. A method for transmitting/receiving downlink signal in a wireless communication system, the method comprising the steps of:

forming two N-bit blocks by repeating an N-bit block including N (positive integer) symbols including frame configuration information;

forming an encoded signal of two NM-bit blocks by encoding an input signal including the two N-bit blocks by a code rate of 1/M (M is positive real number);

interleaving the encoded signal to form a interleaved output of two NM-bit blocks;

allocating the interleaved output to an FCH, and transmitting the FCH through downlink signal;

receiving the downlink signal;

generating a deinterleaved output of the two NM-bit blocks by deinterleaving the received downlink signal;

mutually combining and averaging repeated symbols of the deinterleaved output;

reconfiguring two NM-bit blocks by repeating the averaged symbols;

restoring two N-bit blocks by decoding the deinterleaved output of the reconfigured two NM-bit blocks; and

obtaining the frame configuration information from the restored N-bit blocks.

12. The method as claimed in claim 10 or 11, wherein the wireless communication system is an IEEE 802.16e-based wireless communication system.

13. The method as claimed in claim 12, wherein the IEEE 802.16e-based wireless communication system employs OFDMA and TDD schemes.

11. A method for transmitting/receiving downlink signal in a wireless communication system, the method comprising the steps of:

forming two N-bit blocks by repeating an N-bit block including N (positive integer) symbols having frame configuration information;

forming an encoded signal of two NM-bit blocks by encoding input signal including the two N-bit blocks by a code rate of 1/M (M is positive real number);

interleaving the encoded input signal to form a interleaved output of two NM-bit blocks;

allocating the interleaved output to an FCH, and transmitting the FCH through downlink signal;

receiving the downlink signal including the FCH to which the two NM-bit blocks are allocated;

mutually combining and averaging repeated symbols in the two NM-bit blocks included in the received downlink signal;

reconfiguring two NM-bit blocks by repeating the averaged symbols;

generating a deinterleaved output of the two repeated NM-bit blocks by deinterleaving the reconfigured two NM-bit blocks;

restoring two N-bit blocks by decoding the deinterleaved output; and

obtaining the frame configuration information from the restored N-bit blocks.

14. A receiver comprising:

a deinterleaver for deinterleaving a transmission signal including repeated symbols;

a combiner for mutually combining the repeated symbols in the deinterleaved signal; and

a decoder for decoding the combined symbols.

16. The receiver as claimed in claim 14 or 15, wherein the repeated symbols included in the transmission signal are formed through a repetition process of symbols before encoding in a transmitter.

17. The receiver as claimed in claim 16, wherein the repeated symbols correspond to information transmitted using an FCH.

18. The receiver as claimed in claim 17, wherein the repeated symbols include configuration information of a corresponding frame.

19. The receiver as claimed in claim 16, wherein the combiner mutually adds and averages the repeated symbols.

20. The receiver as claimed in claim 19, wherein the combiner repeats the averaged symbols.

21. The receiver as claimed in claim 16, wherein the transmission signal is a downlink signal in an IEEE 802.16e-based wireless communication system.

22. The receiver as claimed in claim 21, wherein the IEEE 802.16e-based wireless communication system employs OFDMA and TDD schemes.

15. A receiver comprising:

a combiner for mutually combining repeated symbols in transmission signal including the repeated symbols;

a deinterleaver for deinterleaving the transmission signal including the combined symbols; and

a decoder for decoding the deinterleaved signal.

23. A wireless communication system comprising:

a transmitter; and

a receiver,

wherein the transmitter comprises;

a repetition means for forming two N-bit blocks by repeating an N-bit block including N (positive integer) symbols;

an encoding means for forming encoded signal of two NM-bit blocks by encoding input signal including the two N-bit blocks by a code rate of 1/M (M is positive real number);

an interleaving means for interleaving the encoded input signal to generate interleaved output of two NM-bit blocks; and

a transmission means for allocating the interleaved output to an FCH, and transmitting the FCH through a downlink signal,

wherein the receiver comprises;

a reception means for receiving the downlink signal;

a deinterleaving means for generating deinterleaved output of two NM-bit blocks by deinterleaving the received downlink signal;

a combining means for mutually combining repeated symbols of the deinterleaved output; and

a decoding means for restoring two N-bit blocks by decoding the deinterleaved output of the two combined NM-bit blocks.

25. The wireless communication system as claimed in claim 23 or 24, wherein a block allocated to the FCH and transmitted by the transmission means in the transmitter includes configuration information of a corresponding frame, and the decoding means of the receiver obtains the configuration information from the restored bit blocks.

26. The wireless communication system as claimed in claim 25, wherein the combining means in the receiver mutually adds and averages the repeated symbols, and repeats the averaged symbols.

27. The wireless communication system as claimed in claim 26, wherein the wireless communication system is an IEEE 802.16e-based wireless communication system, and employs OFDMA and TDD schemes.

24. A wireless communication system comprising:

a transmitter; and

a receiver,

wherein the transmitter comprises;

a repetition means for forming two N-bit blocks by repeating an N-bit block including N (positive integer) symbols;

an encoding means for forming encoded signal of two NM-bit blocks by encoding input signal including the two N-bit blocks by a code rate of 1/M (M is positive real number);

an interleaving means for interleaving the encoded input signal to form interleaved output of two NM-bit blocks; and

a transmission means for allocating the interleaved output to an FCH, and transmitting the FCH through downlink signal,

wherein the receiver comprises;

a reception means for receiving the downlink signal;

a combining means for mutually combining repeated symbols in the two NM-bit blocks included in the received downlink signal;

a deinterleaving means for generating deinterleaved output of two NM-bit blocks by deinterleaving the combined two NM-bit blocks; and

a decoding means for restoring two N-bit blocks by decoding the deinterleaved output.