Carrier phase tracking method and device for orthogonal frequency division multiplexing multi-carrier system

An electronic device, comprising a processor and a memory storing a computer program that is executable on the processor, the computer program, when executed by the processor, causes the processor to perform the following steps:

• performing frequency domain tracking on a received current orthogonal frequency division multiplexing (OFDM) symbol and determining a phase of each subcarrier;
• analyzing a phase curve of all subcarriers and determining an inter-symbol phase average offset, wherein the inter-symbol phase average offset is used to characterize an estimated value of a difference obtained by subtracting a second value from a first value, the first value is a carrier phase value of the current OFDM symbol, and the second value is an estimated value of a carrier phase of a previous OFDM symbol;
• and
• performing time domain tracking by using the inter-symbol phase average offset as an input phase and determining an estimated value of a carrier phase of the current OFDM symbol,
• wherein after determining the estimated value of the carrier phase of the current OFDM symbol, the computer program, when executed by the processor, causes the processor to further perform the steps of:
• compensating the estimated value of the carrier phase of the current OFDM symbol according to a first fixed phase gap and a second fixed phase gap, wherein the first fixed phase gap is a phase gap generated by a frequency domain phase locked loop (PLL), and the frequency domain PLL is used to perform frequency domain tracking on a received OFDM symbol;
• and the second fixed phase gap is a phase gap generated by a time domain PLL, and the time domain PLL is used to perform time domain tracking on an input phase;
• or
• wherein when the electronic device is applied to an OFDM multi-carrier system in a time division duplex (TDD) mode, after determining the estimated value of the carrier phase of the current OFDM symbol, the computer program, when executed by the processor, causes the processor to further perform the steps of:
• compensating the estimated value of the carrier phase of the current OFDM symbol according to an integer ambiguity change, wherein the integer ambiguity change is a difference obtained by subtracting an integer ambiguity of a previous segment downlink received signal from an integer ambiguity of a current segment downlink received signal, and the current segment downlink received signal is a segment of downlink received signal comprising the current OFDM symbol;
• or
• wherein when the electronic device is applied to an OFDM multi-carrier system in the TDD mode, after the determining the estimated value of the carrier phase of the current OFDM symbol, the computer program, when executed by the processor, causes the processor to further perform the steps of:
• compensating the estimated value of the carrier phase of the current OFDM symbol according to a first fixed phase gap, a second fixed phase gap and an integer ambiguity change, wherein the first fixed phase gap is a phase gap generated by a frequency domain PLL, and the frequency domain PLL is used to perform frequency domain tracking on a received OFDM symbol;
• the second fixed phase gap is a phase gap generated by a time domain PLL, and the time domain PLL is used to perform time domain tracking on an input phase;
• and the integer ambiguity change is a difference obtained by subtracting an integer ambiguity of a previous segment downlink received signal from an integer ambiguity of a current segment downlink received signal, and the current segment downlink received signal is a segment of downlink received signal comprising the current OFDM symbol.