Communication apparatus, method, and tangible machine-readable medium thereof for processing ranging interference of an orthogonal frequency division multiplexing signal

A method for removing ranging interference in an orthogonal frequency division multiplexing (OFDM) signal, the OFDM signal comprising a plurality of OFDM symbols, the method comprising the steps of:

• receiving the OFDM signal;
• estimating a time delay and an energy value of at least one ranging code according to the OFDM symbols;
• generating a mask function according to the time delay and the energy value of the at least one ranging code;
• synthesizing the ranging interference in the OFDM signal according to the mask function;
• and
• removing the ranging interference from the OFDM signal;
• wherein the at least one ranging code is a plurality of ranging codes, the mask function is determined according to the following equation:
• w
• ⁡
• (
• n
• )
• =
• ∑
• i
• =
• 1
• M
• ⁢
• ∑
• l
• =
• 1
• L
• ⁢
• C
• il
• ⁢
• U
• ⁡
• (
• t
• il
• -
• n
• )
• wherein w(n) represents the mask function, U(til−n) represents a step function for each of a plurality of paths associated with the ranging codes, Cil represents a weight of each of the step functions, n represents a time index, M represents a number of the ranging codes, L represents a number of the paths for each of the ranging codes, and til represents the time delay parameter of each of the paths associated with the ranging codes.

A communication apparatus for processing an OFDM signal, the OFDM signal comprising a plurality of OFDM symbols, the communication apparatus comprising:

• a receiving unit being configured to receive the OFDM signal;
• a processing unit being configured to estimate a time delay and an energy value of at least one ranging code according to the OFDM symbols;
• and
• a mask generating unit being configured to generate a mask function according to the time delay and the energy value of the at least one ranging code;
• wherein the processing unit synthesizes a ranging interference in the OFDM signal according to the mask function and removes the ranging interference from the OFDM signal, and the at least one ranging code is a plurality of ranging codes, the mask function is determined according to the following equation:
• w
• ⁡
• (
• n
• )
• =
• ∑
• i
• =
• 1
• M
• ⁢
• ∑
• l
• =
• 1
• L
• ⁢
• C
• il
• ⁢
• U
• ⁡
• (
• n
• -
• t
• il
• )
• wherein w(n) represents the mask function, U (n−til) represents a step function for each of a plurality of paths associated the ranging codes, Cil represents a weight of each of the step functions, n represents a time index, M represents a number of the ranging codes, L represents a number of the paths for each of the ranging codes, and til represents the time delay parameter of each of the paths associated with the ranging codes.

A communication apparatus for processing an OFDM signal, the OFDM signal comprising a plurality of OFDM symbols, the communication apparatus comprising:

• a receiving unit being configured to receive the OFDM signal;
• a processing unit being configured to estimate a time delay and an energy value of at least one ranging code according to the OFDM symbols;
• and
• a mask generating unit being configured to generate a mask function according to the time delay and the energy value of the at least one ranging code;
• wherein the processing unit synthesizes a ranging interference in the OFDM signal according to the mask function and removes the ranging interference from the OFDM signal, and the at least one ranging code is a plurality of ranging codes, the mask function is determined according to the following equation:
• w
• ⁡
• (
• n
• )
• =
• ∑
• i
• =
• 1
• M
• ⁢
• ∑
• l
• =
• 1
• L
• ⁢
• C
• il
• ⁢
• U
• ⁡
• (
• t
• il
• -
• n
• )
• wherein w(n) represents the mask function, U(til−n) represents a step function for each of a plurality of paths associated with the ranging codes, Cil represents a weight of each of the step functions, n represents a time index, M represents a number of the ranging codes, L represents a number of the paths for each of the ranging codes, and til represents the time delay parameter of each of the paths associated with the ranging codes.

A tangible non-transitory machine-readable medium having executable code to cause a communication apparatus to perform a method for removing ranging interference of an OFDM signal, the OFDM signal comprising a plurality of OFDM symbols, the method comprising the steps of:

• receiving the OFDM signal;
• estimating a time delay and an energy value of at least one ranging code according to the OFDM symbols;
• generating a mask function according to the time delay and the energy value of the at least one ranging code;
• synthesizing the ranging interference in the OFDM signal according to the mask function;
• and
• removing the ranging interference from the OFDM signal;
• wherein the at least one ranging code is a plurality of ranging codes, the mask function is determined according to the following equation:
• w
• ⁡
• (
• n
• )
• =
• ∑
• i
• =
• 1
• M
• ⁢
• ∑
• l
• =
• 1
• L
• ⁢
• C
• il
• ⁢
• U
• ⁡
• (
• n
• -
• t
• il
• )
• wherein w(n) represents the mask function, U(n−til) represents a step function for each of a plurality of paths associated with the ranging codes, Cil represents a weight of each of the step functions, n represents a time index, M represents a number of the ranging codes, L represents a number of the paths for each of the ranging codes, and til represents the time delay parameter of each of the paths associated with the ranging codes.

A tangible non-transitory machine-readable medium having executable code to cause a communication apparatus to perform a method for removing ranging interference of an OFDM signal, the OFDM signal comprising a plurality of OFDM symbols, the method comprising the steps of:

• receiving the OFDM signal;
• estimating a time delay and an energy value of at least one ranging code according to the OFDM symbols;
• generating a mask function according to the time delay and the energy value of the at least one ranging code;
• synthesizing the ranging interference in the OFDM signal according to the mask function;
• and
• removing the ranging interference from the OFDM signal;
• wherein the at least one ranging code is a plurality of ranging codes, the mask function is determined according to the following equation:
• w
• ⁡
• (
• n
• )
• =
• ∑
• i
• =
• 1
• M
• ⁢
• ∑
• l
• =
• 1
• L
• ⁢
• C
• il
• ⁢
• U
• ⁡
• (
• t
• il
• -
• n
• )
• wherein w(n) represents the mask function, U(til−n) represents a step function for each of a plurality of paths associated with the ranging codes, Cil represents a weight of each of the step functions, n represents a time index, M represents a number of the ranging codes, L represents a number of the paths for each of the ranging codes, and til represents the time delay parameter of each of the paths associated with the ranging codes.