Reference signal generation method, reference signal detection method, and communications apparatus

A reference signal detection method, comprising:

• receiving a reference signal, to obtain a first sequence;
• obtaining a second sequence based on a pseudo-random sequence initial factor cinit;
• and
• performing correlation detection on the first sequence and the second sequence, wherein
• the pseudo-random sequence initial factor cinit is represented by using 31 bits;
• 10 least significant bits in the 31 bits represent nID mod 1024;
• 21 most significant bits in the 31 bits represent (Nsymbslotns, fμ+l+1)(2(nID mod 1024)+1);
• and
• d bits in the 21 most significant bits represent
• ⌊
• n
• I
• ⁢
• D
• 1
• ⁢
• 0
• ⁢
• 2
• ⁢
• 4
• ⌋
• ,
• and a value of d is related to a maximum value of nID, wherein:
• Nsymbslot represents a quantity of orthogonal frequency-division multiplexing (OFDM) symbols in a slot,
• └ ┘ represents rounding down,
• ns, fμ represents an index of a slot in a frame,
• l represents an index of an OFDM symbol in a slot,
• nID represents a reference signal sequence ID,
• μ represents a parameter related to a subcarrier spacing, and
• mod represents a modulo operation.

A communications apparatus, comprising at least one processor and a memory coupled with the at least one processor, wherein the at least one processor is configured to:

• obtain a reference signal sequence based on a pseudo-random sequence initial factor cinit;
• and
• map the sequence to one or more orthogonal frequency-division multiplexing (OFDM) symbols,
• and wherein:
• the pseudo-random sequence initial factor cinit is represented by using 31 bits;
• 10 least significant bits in the 31 bits represent nID mod 1024;
• 21 most significant bits in the 31 bits represent (Nsymbslotns, fμ+l+1)(2(nID mod 1024)+1);
• and
• d bits in the 21 most significant bits represent
• ⌊
• n
• I
• ⁢
• D
• 1
• ⁢
• 0
• ⁢
• 2
• ⁢
• 4
• ⌋
• ,
• and a value of d is related to a maximum value of nID, wherein:
• Nsymbslot represents a quantity of OFDM symbols in a slot,
• └ ┘ represents rounding down,
• ns, fμ represents an index of a slot in a frame,
• l represents an index of an OFDM symbol in a slot,
• nID represents a reference signal sequence ID,
• μ represents a parameter related to a subcarrier spacing, and
• mod represents a modulo operation.

A communications apparatus, comprising at least one processor and a memory coupled with the at least one processor, wherein the at least one processor is configured to:

• receive a reference signal;
• obtain a first sequence based on the reference signal;
• obtain a second sequence based on a pseudo-random sequence initial factor cinit;
• and
• perform correlation detection on the first sequence and the second sequence, wherein:
• the pseudo-random sequence initial factor cinit is represented by using 31 bits;
• 10 least significant bits in the 31 bits represent nID mod 1024;
• 21 most significant bits in the 31 bits represent (Nsymbslotns, fμ+l+1)(2(nID mod 1024)+1);
• and
• d bits in the 21 most significant bits represent
• ⌊
• n
• I
• ⁢
• D
• 1
• ⁢
• 0
• ⁢
• 2
• ⁢
• 4
• ⌋
• ,
• and a value of d is related to a maximum value of nID, wherein:
• A T slot
• Nsymbslot represents a quantity of orthogonal frequency-division multiplexing (OFDM) symbols in a slot,
• └ ┘ represents rounding down,
• ns, fμ represents an index of a slot in a frame,
• l represents an index of an OFDM symbol in a slot,
• nID represents a reference signal sequence ID,
• μ represents a parameter related to a subcarrier spacing, and
• mod represents a modulo operation.