Method for mapping and demapping resource in a wireless communication system and an apparatus thereof
A method and apparatus for mapping/demapping a resource efficiently in a wireless communication system are provided. A resource mapping method of a transmitter in a wireless communication system includes precoding pairs of symbols, arranging the pairs of precoded symbols adjacently in a resource block, and transmitting the pairs of precoded symbols in the resource block.
1. A method for receiving data in a wireless communication system using transmission diversity, the method comprising:
receiving, by a receiver, a signal including precoded data symbols on a plurality of resource blocks, each resource block comprising Orthogonal Frequency Division Multiplexing (OFDM) symbols and one OFDM symbol from among the OFDM symbols comprising a plurality of first resource elements and a plurality of second resource elements;
determining, by a resource element demapper, whether the precoded data symbols are mapped to the plurality of first resource elements in the one OFDM symbol;
demapping, by the resource element demapper, a precoded data symbol from one resource element from among the plurality of first resource elements of the one OFDM symbol if the precoded data symbol is mapped to the one resource element from among the plurality of first resource elements in the one OFDM symbol; and
decoding, by a decoder, the precoded data symbol according to a symbol precoding scheme,
wherein at least one resource element from among the plurality of first resource elements in the one OFDM symbol is muted if a separation between two resource elements which are available to assign the at least one pair of precoded data symbols in the one OFDM symbol is three or more subcarrier indices,
wherein the at least one muted resource element is located in the one OFDM symbol having the two resource elements, the separation between the two resource elements which are available to assign the at least one pair of precoded data symbols is the three or more subcarrier indices,
wherein the demapping of the precoded data symbol is skipped for each resource element that is muted, and
wherein reference signals are mapped to the plurality of second resource elements in the one OFDM symbol.
2. The method of claim 1 , wherein a Channel State Information Reference Signal (CSI-RS) is mapped to one of the plurality of second resource elements in the one OFDM symbol of the resource block.
3. The method of claim 1 , wherein the symbol precoding scheme is transmit diversity comprising at least one of space frequency block coding (SFBC) and frequency switched transmit diversity (FSTD).
4. The method of claim 1 , wherein a Physical Broadcast Channel (PBCH), synchronization signals, and a Physical Downlink Control Channel (PDCCH) are further mapped to the plurality of second resource elements.
5. The method of claim 1 , wherein the precoded data symbols are mapped to the plurality of first resource elements from a first subcarrier of the one OFDM symbol to a last subcarrier of the one OFDM symbol in a sequence.
6. An apparatus for receiving data in a wireless communication system using transmission diversity, the apparatus comprising:
an antenna configured to receive a signal including precoded data symbols on a plurality of resource blocks, each resource block comprising Orthogonal Frequency Division Multiplexing (OFDM) symbols and one OFDM symbol from among the OFDM symbols comprising a plurality of first resource elements and a plurality of second resource elements;
a resource element demapper configured to:
determine whether the precoded data symbols are mapped to the plurality of first resource elements in the one OFDM symbol, and
demap a precoded data symbol from one resource element from among the plurality of first resource elements of the one OFDM symbol if the precoded data symbol is mapped to the one resource element from among the plurality of first resource elements; and
a decoder configured to decode the precoded data symbol according to a symbol precoding scheme,
wherein at least one resource element from among the plurality of first resource elements in the one OFDM symbol is muted if a separation between two resource elements which are available to assign the at least one pair of precoded data symbols in the one OFDM symbol is three or more subcarrier indices,
wherein the at least one muted resource element is located in the one OFDM symbol having the two resource elements, the separation between the two resource elements which are available to assign the at least one pair of precoded data symbols is the three or more subcarrier indices,
wherein the demapping of the precoded data symbol is skipped for each resource element that is muted, and
wherein reference signals are mapped to the plurality of second resource elements.
7. The apparatus of claim 6 , wherein a Channel State Information Reference Signal (CSI-RS) is mapped to one of the plurality of second resource elements in the one OFDM symbol of the resource block.
8. The apparatus of claim 6 , wherein the symbol precoding scheme is transmit diversity comprising at least one of space frequency block coding (SFBC) and frequency switched transmit diversity (FSTD).
9. The apparatus of claim 6 , wherein a Physical Broadcast Channel (PBCH), synchronization signals, and a Physical Downlink Control Channel (PDCCH) are further mapped to the plurality of second resource elements.
10. The apparatus of claim 6 , wherein the precoded data symbols are mapped to the plurality of first resource elements from a first subcarrier of the one OFDM symbol to a last subcarrier of the one OFDM symbol in a sequence.