Data processing method and apparatus

A data processing apparatus, comprising:

• an interpolating and filtering circuit, configured to receive a first data flow, wherein the first data flow is a 1× symbol rate data flow obtained after a 2× symbol rate quadrature phase shift keying (QPSK) modulation signal undergoes frame synchronization adjustment, balancing, data extraction, and constellation position determining, and to perform interpolation into the first data flow to obtain a second data flow;
• a receiving circuit, configured to receive a third data flow, wherein the third data flow is a 2× symbol rate data flow obtained after the 2× symbol rate QPSK modulation signal undergoes frame synchronization adjustment and balancing;
• a calculating circuit, configured to calculate a data flow signal quality difference between the third data flow and the second data flow;
• and
• an obtaining circuit, configured to obtain a digital pre-distortion (DPD) non-linear distortion compensation coefficient according to the data flow signal quality difference and the third data flow or the second data flow.

A receiving device, comprising at least a frame synchronization circuit, a balancer, an extracting circuit, a hard decision circuit, and a data processing apparatus, wherein:

• the frame synchronization circuit is configured to perform symbol clock recovery and frame header alignment for a received data flow;
• the balancer is configured to perform distortion compensation for the data flow processed by the frame synchronization module;
• the extracting circuit is configured to perform data extraction for the data flow processed by the balancer;
• the hard decision circuit is configured to determine a constellation point for a symbol corresponding to the data flow processed by the extracting module to obtain the first data flow;
• and
• the data processing apparatus is configured to:
• receive a first data flow, wherein the first data flow is a 1× symbol rate data flow obtained after a 2× symbol rate quadrature phase shift keying (QPSK) modulation signal undergoes frame synchronization adjustment, balancing, data extraction, and constellation position determining, and to perform interpolation into the first data flow to obtain a second data flow;
• receive a third data flow, wherein the third data flow is a 2× symbol rate data flow obtained after the 2× symbol rate QPSK modulation signal undergoes frame synchronization adjustment and balancing;
• calculate a data flow signal quality difference between the third data flow and the second data flow;
• and
• obtain a digital pre-distortion (DPD) non-linear distortion compensation coefficient according to the data flow signal quality difference and the third data flow or the second data flow.

A data processing system, comprising at least a sending device and a receiving device, wherein:

• the sending device is configured to receive a DPD non-linear distortion compensation coefficient sent by the receiving device, convert the DPD non-linear distortion compensation coefficient into a data flow for implementing pre-distortion compensation, amplify power of the data flow, and output the amplified data flow;
• and
• the receiving device is configured to:
• perform symbol clock recovery and frame header alignment for a received data flow;
• perform distortion compensation for the data flow processed by the frame synchronization module;
• perform data extraction for the data flow processed by the balancer;
• determine a constellation point for a symbol corresponding to the data flow processed by the extracting module to obtain the first data flow;
• receive a first data flow, wherein the first data flow is a 1× symbol rate data flow obtained after a 2× symbol rate quadrature phase shift keying (QPSK) modulation signal undergoes frame synchronization adjustment, balancing, data extraction, and constellation position determining, and to perform interpolation into the first data flow to obtain a second data flow;
• receive a third data flow, wherein the third data flow is a 2× symbol rate data flow obtained after the 2× symbol rate QPSK modulation signal undergoes frame synchronization adjustment and balancing;
• calculate a data flow signal quality difference between the third data flow and the second data flow;
• and
• obtain a digital pre-distortion (DPD) non-linear distortion compensation coefficient according to the data flow signal quality difference and the third data flow or the second data flow.