Symbol mapping method for repetition channel coding
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 a signal at a base station in a mobile communication system, the method comprising:
performing repetition coding on an information bit to generate a plurality of codeword bits;
obtaining a plurality of modulation symbols from the plurality of codeword bits;
mapping the plurality of modulation symbols to one or more resource-element groups; and
transmitting the plurality of mapped modulation symbols,
wherein at least two of the plurality of modulation symbols are mapped separately from each other in the frequency domain within a same time duration.
2. The method of claim 1 , wherein the plurality of mapped modulation symbols are transmitted via a control channel.
3. The method of claim 1 , wherein the at least two of the plurality of modulation symbols are mapped separately from each other in the frequency domain within the same time duration when the plurality of modulation symbols are mapped to two OFDM symbols.
4. A base station comprising a processor and memory, the memory including computer instructions that, when executed by the processor, cause the processor to:
perform repetition coding on an information bit to generate a plurality of codeword bits;
obtain a plurality of modulation symbols from the plurality of codeword bits;
map the plurality of modulation symbols to one or more resource-element groups; and
transmit the plurality of mapped modulation symbols, wherein at least two of the plurality of modulation symbols are mapped separately from each other in the frequency domain within a same time duration.
5. The base station of claim 4 , wherein the plurality of mapped modulation symbols are transmitted via a control channel.
6. The base station of claim 4 , wherein the at least two of the plurality of modulation symbols are mapped separately from each other within the same time duration when the plurality of modulation symbols are mapped to two OFDM symbols.