The invention claimed is:1. A method of transmitting and receiving a signal of a base station to a user equipment (UE) full duplex in a wireless communication system, the method comprising:transmitting a first resource element (RE) set including two REs to the UE based on different precoders to the two REs of the first RE set; andreceiving a second RE set including two REs from a plurality of UEs including the UE while the first RE set is transmitted based on different post-coders to the two REs of the second RE set,wherein code division multiplexing (CDM) codes are applied to the first RE set transmitted from the base station to the UE in downlink and the second RE set transmitted from the UE to the base station in uplink,wherein each of the different precoders is a 2L*L precoding matrix, where L is a number of layers, andwherein the different precoders are respectively applied to the two REs of the first RE set by jointly precoding 2L*1 transmission symbols in the first RE through two 2L*L precoding matrices.2. The method of claim 1, wherein the different precoders are linearly independent.3. The method of claim 1, wherein 2L data is transmitted in each of the two REs of the first RE set.4. The method of claim 1, wherein the number of plurality of UEs is 2L.5. The method of claim 4, wherein a number of antennas of the base station is equal to or greater than 2L.6. The method of claim 1, wherein the base station has L radio frequency (RF) chains.7. The method of claim 1, wherein the first RE set and the second RE set are preset or indicated through higher layer signaling.8. A method of transmitting and receiving a signal of a user equipment (UE) supporting full duplex to a base station in a wireless communication system, the method comprising:receiving, from the base station, a first resource element (RE) set including two REs, to which different precoders are applied; andtransmitting, to the base station, a second RE set including two REs while the first RE set is transmitted,wherein code division multiplexing (CDM) codes are respectively applied to the first RE set transmitted from the base station to the UE in downlink and the second RE set transmitted from the UE to the base station in uplink,wherein each of the different precoders is a 2L*L precoding matrix, where L is a number of layers, andwherein the different precoders are respectively applied to the two REs of the first RE set by jointly precoding 2L*1 transmission symbols in the first RE through two 2L*L precoding matrices.9. A base station apparatus supporting full duplex in a wireless communication system, the base station apparatus comprising:a memory; anda processor connected to the memory,wherein the processor is configured totransmit a first resource element (RE) set including two REs to the UE based on different precoders to the two REs of the first RE set, andreceive a second RE set including two REs from a plurality of UEs including the UE while the first RE set is transmitted based on different post-coders to the two REs of the second RE set,wherein code division multiplexing (CDM) codes are respectively applied to the first RE set transmitted from the base station to the UE in downlink and the second RE set transmitted from the UE to the base station in uplink,wherein each of the different precoders is a 2L*L precoding matrix, where L is a number of layers, andwherein the different precoders are respectively applied to the two REs of the first RE set by jointly precoding 2L*1 transmission symbols in the first RE through two 2L*L precoding matrices.
