Symbol mapping method for repetition channel coding
View Patent ↗A symbol mapping method for repetition coding is disclosed. The symbol mapping method comprises performing repetition coding on codeword to output repeated codeword symbols, and mapping the repeated codeword symbols with subcarriers located in different localized resource blocks. According to the embodiments of the present invention, it is possible to obtain maximum reliability in a receiving side by mapping codeword bits with subcarriers to reduce the number of bits having low reliability when a transmitting side uses repetition coding. Also, it is possible to improve decoding throughput and obtain channel diversity.
1. A method for transmitting control channel data using time-frequency resources in a mobile communication system employing repetition coding, the method comprising:
performing the repetition coding on the control channel data in order to output a plurality of encoded control channel data at a base station; and
transmitting the plurality of encoded control channel data using the time-frequency resources, wherein the time-frequency resources are defined by a plurality of orthogonal frequency division multiplexing (OFDM) symbols in a time domain and a plurality of subcarriers in a frequency domain,
wherein the plurality of encoded control channel data are transmitted separate from each other in the frequency domain when one of the plurality of OFDM symbols is used for transmitting, and
wherein at least two of the plurality of encoded control channel data are transmitted using one of the plurality of OFDM symbols and the at least two of the plurality of encoded control channel data are transmitted separate from each other in the frequency domain when two of the plurality of OFDM symbols are used for transmitting.
2. The method of claim 1 , further comprising:
performing interleaving on the control channel data prior to performing the repetition coding.
3. The method of claim 1 , further comprising:
a same localized resource block, the at least two of the plurality of encoded control channel data are transmitted in a manner that results in a maximum interval from each other when the at least two of the plurality of encoded control channel data are transmitted using.
4. The method of claim 1 , wherein transmitting the plurality of encoded control channel data comprises determining a start position of the plurality of encoded control channel data within a localized resource block.
5. The method of claim 2 , further comprising generating symbols of the interleaved control channel data by performing channel symbol modulation for the interleaved control channel data prior to performing the repetition coding.
6. The method of claim 2 , further comprising generating symbols of the interleaved control channel data by performing channel symbol modulation for the interleaved control channel data after performing the repetition coding.