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add post josh-dsp-1&2; update image watermark

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josh
2023-04-14 22:22:06 +08:00
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source/_posts/2020-11-27-matlab-awgn.md
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@@ -60,9 +60,7 @@ plot(t,[x y])
legend('Original Signal','Signal with AWGN')
```
<div align="center">
<img src="https://josh-blog-1257563604.cos.ap-beijing.myqcloud.com/img/2020-11-27-matlab-awgn/2020-11-27-matlab-awgn-010-AddAWGNToSawtoothSignalExample-01.png?imageMogr2/thumbnail/!100p|watermark/2/text/QEpvc2ggR2Fv/fontsize/15/dissolve/60/gravity/southeast/dx/5/dy/5"/>
</div>
![ ](https://josh-blog-1257563604.cos.ap-beijing.myqcloud.com/img/2020-11-27-matlab-awgn/2020-11-27-matlab-awgn-010-AddAWGNToSawtoothSignalExample-01.png?imageMogr2/thumbnail/!100p|watermark/2/text/QEpvc2ggR2Fv/font/YWhyb25iZC50dGY=/fontsize/14/dissolve/20/gravity/southeast/dx/5/dy/5)
## AWGN 信道中的常规 QAM 调制<span id="Examples-02"></span>
@@ -103,9 +101,7 @@ grid
hold off
```
<div align="center">
<img src="https://josh-blog-1257563604.cos.ap-beijing.myqcloud.com/img/2020-11-27-matlab-awgn/2020-11-27-matlab-awgn-020-GeneralQAMModulationInAnAWGNChannelExample-01.png?imageMogr2/thumbnail/!100p|watermark/2/text/QEpvc2ggR2Fv/fontsize/15/dissolve/60/gravity/southeast/dx/5/dy/5"/>
</div>
![ ](https://josh-blog-1257563604.cos.ap-beijing.myqcloud.com/img/2020-11-27-matlab-awgn/2020-11-27-matlab-awgn-020-GeneralQAMModulationInAnAWGNChannelExample-01.png?imageMogr2/thumbnail/!100p|watermark/2/text/QEpvc2ggR2Fv/fontsize/15/dissolve/60/gravity/southeast/dx/5/dy/5)
使用 `genqamdemod` 函数解调接收到的信号。计算误符号数和误符号率。