Method for transmitting and receiving downlink signal in wireless communication system, and apparatus therefor

A method of transmitting a downlink signal by a base station (BS) having a cell in which a plurality of beams are multiplexed in a wireless communication system, the method comprising:

• generating a quasi-orthogonal scrambling sequence in consideration of at least one beam through which the downlink signal is to be transmitted among the multiplexed plurality of beams;
• scrambling the downlink signal using the generated quasi-orthogonal scrambling sequence;
• and
• transmitting the downlink signal through at least one beam to a user equipment (UE),
• wherein in the generation of quasi-orthogonal scrambling sequence, the BS initializes the quasi-orthogonal scrambling sequence using a beam-specific parameter corresponding to the at least one beam for transmitting the downlink signal.

A user equipment (UE) for receiving a downlink signal from a cell in which a plurality of beams are multiplexed, the UE comprising:

• a processor to generate a quasi-orthogonal scrambling sequence used for scrambling the downlink signal;
• and
• a receiver to receive the downlink signal through at least one beam among the multiplexed plurality of beams, using the generated quasi-orthogonal scrambling sequence, under control of the processor,
• wherein in the generation of the quasi-orthogonal scrambling sequence, the processor initializes the quasi-orthogonal scrambling sequence using a beam-specific parameter corresponding to the at least one beam for transmitting the downlink signal.

A base station (BS) having a cell in which a plurality of beams are multiplexed, the BS comprising:

• a processor to generate a quasi-orthogonal scrambling sequence in consideration of at least one beam through which a downlink signal is to be transmitted among the multiplexed plurality of beams and to scramble the downlink signal using the generated quasi-orthogonal scrambling sequence;
• and
• a transmitter to transmit the downlink signal through at least one beam to a user equipment (UE) under control of the processor,
• wherein in generation of the quasi-orthogonal scrambling sequence, the processor initializes the quasi-orthogonal scrambling sequence using a beam-specific parameter corresponding to the at least one beam for transmitting the downlink signal.