VHDL设计（载波同步）
时间：10-02
整理：3721RD
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本人在扩频载波同步中（已经伪码同步），利用锁相环进行载波相位的跟踪，思路是是用利用I路、Q路相关累加后，用coridc进行了atan得出相位差。现在问题是怎么我看到有人是在atan之前先对I路、Q路相关累值进行了变换处理。如下：
process(clk)
begin
if (clk'event and clk='1') then
if (correlation_I(20) = '1') then --correlation_I(20)是符号位
correlation_I_cordic <= (not correlation_I)+'1';
correlation_Q_cordic <= correlation_Q;
else
correlation_I_cordic <= correlation_I;
correlation_Q_cordic <= (not correlation_Q)+'1';
end if;
end if;
end process;
请问各位高手，这是怎么会事?
谢谢了
process(clk)
begin
if (clk'event and clk='1') then
if (correlation_I(20) = '1') then --correlation_I(20)是符号位
correlation_I_cordic <= (not correlation_I)+'1';
correlation_Q_cordic <= correlation_Q;
else
correlation_I_cordic <= correlation_I;
correlation_Q_cordic <= (not correlation_Q)+'1';
end if;
end if;
end process;
请问各位高手，这是怎么会事?
谢谢了
我也想了解