阅读说明：本技术 相位回复电路及其操作方法 (Phase recovery circuit and operation method thereof ) 是由 刘甄诒 廖懿颖 于 2018-07-27 设计创作，主要内容包括：本发明揭露一种相位回复电路,用以对一卫星信号进行相位回复。卫星信号包含多个码框。相位回复电路包含一第一相位估算单元、一第二相位估算单元及一控制单元。控制单元耦接至第一相位估算单元及第二相位估算单元,用以根据该多个码框中一码框的一码框格式,选择第一相位估算单元与第二相位估算单元的其中之一,来估算该码框中多个符元的多个相位。码框格式为领航开启、领航关闭与虚设中之一。(The invention discloses a phase recovery circuit for performing phase recovery on a satellite signal. The satellite signal contains a plurality of frames. The phase recovery circuit comprises a first phase estimation unit, a second phase estimation unit and a control unit. The control unit is coupled to the first phase estimation unit and the second phase estimation unit, and is configured to select one of the first phase estimation unit and the second phase estimation unit according to a frame format of one of the frames to estimate a plurality of phases of the symbols in the frame. The frame format is one of pilot on, pilot off and dummy.)

1. A phase recovery circuit for performing phase recovery on a satellite signal, the satellite signal comprising a plurality of frames, the phase recovery circuit comprising:

a first phase estimation unit;

a second phase estimation unit; and

a control unit, coupled to the first phase estimation unit and the second phase estimation unit, for selecting one of the first phase estimation unit and the second phase estimation unit to estimate a plurality of phases of a plurality of symbols in the frame according to a frame format of one of the plurality of frames;

wherein the frame format is one of pilot on, pilot off and dummy.

2. The phase recovery circuit of claim 1, wherein the first phase estimation unit performs phase estimation using a pilot-assisted forward and backward loop algorithm, and the second phase estimation unit performs phase estimation using a pilot-assisted forward loop algorithm.

3. The phase recovery circuit of claim 2 wherein the control unit selects the first phase estimation unit to estimate the phases of the symbols in the frame when the frame format of the frame is pilot on.

4. The phase recovery circuit of claim 2, wherein the control unit selects the second phase estimation unit to estimate the phases of the symbols in the frame when the frame format of the frame is pilot off.

5. The phase recovery circuit of claim 2, wherein the control unit selects the second phase estimation unit to estimate the phases of the symbols in the frame when the frame format of the frame is dummy.

6. The phase recovery circuit of claim 2, wherein the control unit comprises:

a first multiplexer coupled to the first phase estimation unit and the second phase estimation unit; and a controller, coupled to the first multiplexer, for operating the first multiplexer according to the frame format to select one of the first phase estimation unit and the second phase estimation unit to input the satellite signal.

7. The phase recovery circuit of claim 6, wherein the control unit further comprises:

a second multiplexer coupled to the controller, the first phase estimation unit and the second phase estimation unit;

wherein the controller is further configured to operate the second multiplexer according to the frame format to select the phases of the symbols in the frame to be output from one of the first phase estimation unit and the second phase estimation unit.

8. The phase recovery circuit of claim 2, further comprising:

a buffer coupled to the first multiplexer for temporarily storing the satellite signal.

9. The phase recovery circuit of claim 8, wherein the pilot-on frame format comprises a header block, a plurality of pilot blocks, and a plurality of data blocks, and a buffer length of the buffer is greater than or equal to a sum of lengths of the header block, a single pilot block, and a single data block.

10. A method of operating a phase recovery circuit for phase recovering a satellite signal, the satellite signal comprising a plurality of frames, the method comprising:

providing the satellite signal;

selecting one of a first phase estimation unit and a second phase estimation unit according to a frame format of one of the frames; and

the selected first phase estimation unit or the selected second phase estimation unit estimates a plurality of phases of a plurality of symbols in the frame,

wherein the frame format is one of a frame format with navigation opened, a frame format with navigation closed and a dummy frame format.

11. The method of claim 10, wherein the first phase estimation unit performs phase estimation using a pilot-assisted forward and backward loop algorithm, and the second phase estimation unit performs phase estimation using a pilot-assisted forward loop algorithm.

12. The method of claim 11, wherein the first phase estimation unit is selected to estimate the phases of the symbols in the frame when the frame format of the frame is pilot on.

13. The method of claim 11, wherein the second phase estimation unit is selected to estimate the phases of the symbols in the frame when the frame format of the frame is pilot off.

14. The method of claim 11, wherein the second phase estimation unit is selected to estimate the phases of the symbols in the frame when the frame format of the frame is dummy.

15. The method of operation of claim 11, further comprising:

the satellite signal is temporarily stored in a buffer.