Method and apparatus for decoding transmission signals in a wireless communication system

1. A computer-implemented method for decoding a transmission signal, the method comprising:

receiving, using a computer processor, the transmission signal, which is formed by repeating symbols including downlink frame prefix information, encoding repeated symbols to form encoding blocks, and interleaving the encoding blocks;

deinterleaving, using a computer processor, the received transmission signal;

combining, using a computer processor, symbols at the same positions of deinterleaved encoding blocks among the repeated symbols in the deinterleaved transmission signal; and

decoding, using a computer processor, the combined symbols.

2. A computer-implemented method for decoding a transmission signal, the method comprising:

receiving, using a computer processor, the transmission signal, which is formed by repeating symbols including downlink frame prefix information, encoding repeated symbols to form encoding blocks, and interleaving the encoding blocks;

combining, using a computer processor, symbols at the same combination positions of interleaved encoding blocks among the repeated symbols in the received signal;

deinterleaving, using a computer processor, the combined symbols; and

decoding, using a computer processor, the deinterleaved symbols.

3. The computer-implemented 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 computer-implemented method as claimed in claim 3 , wherein the repeated symbols correspond to information transmitted using a frame control header (FCH).

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

6. The computer-implemented method as claimed in claim 3 , wherein the combining of the repeated symbols comprises adding and averaging the repeated symbols.

7. The computer-implemented method as claimed in claim 6 , further comprising;

repeating the averaged symbols after averaging the repeated symbols.

8. The computer-implemented 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 computer-implemented method as claimed in claim 8 , wherein the IEEE 802.16e-based wireless communication system employs orthogonal frequency division multiplexing access (OFDMA) and time division duplexing (TDD) schemes.

10. A computer-implemented method for transmitting/receiving a downlink signal in a wireless communication system, the method comprising:

forming, using a computer processor, two N-bit blocks by repeating an N-bit block including N symbols including downlink frame prefix information, N being a positive integer;

forming, using a computer processor, an encoded signal of two NM-bit blocks by encoding the two N-bit blocks by a code rate of 1/M, M being a positive real number;

interleaving, using a computer processor, the encoded signal to form an interleaved output of two NM-bit blocks;

allocating, using a computer processor, the interleaved output to an FCH, and transmitting the FCH using the downlink signal;

receiving, using a computer processor, the downlink signal;

forming, using a computer processor, a deinterleaved output of the two NM-bit blocks by deinterleaving the received downlink signal;

combining and averaging, using a computer processor, symbols at the same positions of the two NM-bit blocks of the deinterleaved output;

reconfiguring, using a computer processor, two NM-bit blocks by repeating the averaged symbols;

restoring, using a computer processor, two N-bit blocks by decoding the deinterleaved output of the reconfigured two NM-bit blocks; and

obtaining, using a computer processor, the downlink frame information from the restored N-bit blocks.

11. A computer-implemented method for transmitting/receiving a downlink signal in a wireless communication system, the method comprising:

forming, using a computer processor, two N-bit blocks by repeating an N-bit block including N symbols having downlink frame prefix information, N being a positive integer;

forming, using a computer processor, an encoded signal of two NM-bit blocks by encoding the two N-bit blocks by a code rate of 1/M, M being a positive real number;

interleaving, using a computer processor, the encoded input signal to form an interleaved output of two NM-bit blocks;

allocating, using a computer processor, the interleaved output to an FCH, and transmitting the FCH using the downlink signal;

receiving, using a computer processor, the downlink signal including the FCH to which the two NM-bit blocks are allocated;

combining and averaging, using a computer processor, repeated symbols at the same combination positions in the two NM-bit blocks included in the received downlink signal;

reconfiguring, using a computer processor, two NM-bit blocks by repeating the averaged symbols;

forming, using a computer processor, a deinterleaved output by deinterleaving the reconfigured two NM-bit blocks;

restoring, using a computer processor, two N-bit blocks by decoding the deinterleaved output; and

obtaining, using a computer processor, the downlink frame prefix information from the restored N-bit blocks.

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

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

14. A receiver comprising:

a deinterleaver configured to deinterleave a transmission signal, which is formed by repeating symbols including downlink frame prefix information, encoding repeated symbols to form encoding blocks, and interleaving the encoding blocks;

a combiner configured to combine symbols at the same positions of deinterleaved encoding blocks among the repeated symbols in the deinterleaved signal; and

a decoder configured to decode the combined symbols.

15. A receiver comprising:

a combiner for configured to combine symbols at the same combination positions of interleaved encoding blocks among repeated symbols in a transmission signal, which is formed by repeating symbols including downlink frame prefix information, encoding repeated symbols to form encoding blocks, and interleaving the encoding blocks;

a deinterleaver configured to deinterleave the transmission signal including the combined symbols; and

a decoder configured to decode the deinterleaved transmission signal.

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 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.

23. A wireless communication system comprising:

a transmitter; and

a receiver,

wherein the transmitter comprises:

a repetition unit configured to form two N-bit blocks by repeating an N-bit block including N symbols including downlink frame prefix information, N being a positive integer;

an encoding unit configured to form an encoded signal of two NM-bit blocks by encoding the two N-bit blocks by a code rate of 1/M, M being a positive real number;

an interleaving unit configured to interleave the encoded signal to form an interleaved output of two NM-bit blocks; and

a transmission unit configured to allocate the interleaved output to an FCH, and transmit the FCH using a downlink signal, and

wherein the receiver comprises:

a reception unit configured to receive the downlink signal;

a deinterleaving unit configured to form a deinterleaved output of two NM-bit blocks by deinterleaving the received downlink signal;

a combining unit configured to combine repeated symbols at the same positions of the two NM-bit blocks of the deinterleaved output; and

a decoding unit configured to restore two N-bit blocks by decoding the two combined NM-bit blocks.

24. A wireless communication system comprising:

a transmitter; and

a receiver,

wherein the transmitter comprises:

a repetition unit configured to form two N-bit blocks by repeating an N-bit block including N symbols including downlink frame prefix information, N being a positive integer;

an encoding unit configured to form an encoded signal of two NM-bit blocks by encoding the two N-bit blocks by a code rate of 1/M, M being a positive real number;

an interleaving unit configured to interleave the encoded signal to form an interleaved output of two NM-bit blocks; and

a transmission unit configured to allocate the interleaved output to an FCH, and transmit the FCH using a downlink signal, and

wherein the receiver comprises:

a reception unit configured to receive the downlink signal;

a combining unit configured to combine repeated symbols at the same positions of the two NM-bit blocks included in the received downlink signal;

a deinterleaving unit configured to form a deinterleaved output of two NM-bit blocks by deinterleaving the combined two NM-bit blocks; and

a decoding unit configured to restore two N-bit blocks by decoding the deinterleaved output.

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

26. The wireless communication system as claimed in claim 25 , wherein the combining unit in the receiver 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.