System and method for detecting ternary sequences

An apparatus comprising:

• a receiver configured to receive an Orthogonal Frequency Division Multiplexing (OFDM) signal comprising a plurality of OFDM Resource Elements (REs);
• and
• a processor coupled to the receiver, wherein the processor is configured to detect a presence of a known ternary sequence in the received OFDM signal, wherein the known ternary sequence is defined via a ternary alphabet of −1, 0, and +1, and wherein the processor is configured to detect the known ternary sequence at least by
• determining a correlation between (i) a first set of the OFDM REs, and (ii) a first set of symbols of the known ternary sequence, the first set of symbols having values of −1 or +1, and the first set of the OFDM REs having time-frequency slot positions that correspond to positions of the first set of symbols in the known ternary sequence,
• determining an absolute value of each RE of a second set of the OFDM REs, the second set of the OFDM REs having time-frequency slot positions that correspond to positions of symbols in the known ternary sequence having a value of 0,
• squaring each of the absolute values,
• determining a sum of the squared absolute values,
• scaling the determined correlation by a factor of two,
• combining the scaled correlation and the sum to determine a detection value, and
• determining that the known ternary sequence is present in the received OFDM signal based on a determination that the detection value is greater than or equal to a predetermined threshold.

A method comprising:

• receiving an Orthogonal Frequency Division Multiplexing (OFDM) signal comprising a plurality of OFDM Resource Elements (REs);
• and
• detecting a presence of a known ternary sequence in the received OFDM signal, wherein the known ternary sequence is defined via a ternary alphabet of −1, 0, and +1, and wherein detecting the presence of the known ternary sequence in the received OFDM signal includes
• determining a correlation between (i) a first set of the OFDM REs, and (ii) a first set of symbols of the known ternary sequence,
• determining a power of each RE of a second set of the OFDM REs,
• determining a sum of the powers,
• determining a detection value based on the correlation and the sum, and
• determining that the known ternary sequence is present in the received OFDM signal based on a comparison of the detection value to a predetermined threshold.