Channel-sounding method using a plurality of antennas, and apparatus for same

A method for a base station (BS) to process sounding reference signals in a wireless communication system, the method comprising:

• receiving the sounding reference sequences for the multiple antenna ports of the UE on a symbol of a slot, wherein each of the received sounding reference sequences is corresponding to a respective antenna port and defined using a base sequence number and a cyclic shift value;
• and
• de-mapping the received sounding reference sequences from subcarriers of the symbol of the slot,
• wherein cyclic shift values for the multiple antenna ports are determined based on a signaled single value and one or more offsets,
• wherein a first set of the sounding reference sequences are mapped to a first set of every nth subcarriers, and a second set of the sounding reference sequences are mapped to a second set of every mth subcarriers, the second set of every nth subcarriers being different from the first set of every mth subcarriers, and
• wherein n is a multiple of 2, and m is a multiple of 2.

A user equipment (UE) used for a wireless communication system, the UE comprising:

• a memory;
• a radio frequency (RF) unit;
• and
• a processor electronically connected with the memory and the RF unit,
• wherein the processor is configured to:
• map sounding reference sequences for the multiple antenna ports to subcarriers on a symbol of a slot, wherein each of the sounding reference sequences is corresponding to a respective antenna port and defined using a base sequence number and a cyclic shift value, and
• transmit the mapped sounding reference sequences for the multiple antenna ports within the symbol of the slot,
• wherein cyclic shift values for the multiple antenna ports are determined based on a signaled single value and one or more offsets,
• wherein a first set of the sounding reference sequences are mapped to a first set of every nth subcarriers, and a second set of the sounding reference sequences are mapped to a second set of every mth subcarriers, the second set of every nth subcarriers being different from the first set of every mth subcarriers, and
• wherein n is a multiple of 2, and m is a multiple of 2.

A base station (BS) used for a wireless communication system, the communication apparatus comprising:

• a memory;
• a radio frequency (RF) unit;
• and
• a processor electronically connected with the memory and the RF unit,
• wherein the processor is configured to:
• receive the sounding reference sequences for the multiple antenna ports of the UE on a symbol of a slot, wherein each of the received sounding reference sequences is corresponding to a respective antenna port and defined using a base sequence number and a cyclic shift value, and
• de-map the received sounding reference sequences from subcarriers of the symbol of the slot,
• wherein cyclic shift values for the multiple antenna ports are determined based on a signaled single value and one or more offsets,
• wherein a first set of the sounding reference sequences are mapped to a first set of every nth subcarriers, and a second set of the sounding reference sequences are mapped to a second set of every mth subcarriers, the second set of every nth subcarriers being different from the first set of every mth subcarriers, and
• wherein n is a multiple of 2, and m is a multiple of 2.