概述
USRP N210在OAI平台上应用需要考虑的问题
先看看N210的Spec吧,
• Two 100 MS/s 14-bit analog to digital converters
• Two 400 MS/s 16-bit digital to analog converters
• Digital down-converters with programmable decimation rates
• Digital up-converters with programmable interpolation rates
而我们知道,LTE的采样频率一般为7.68,15.36,30.72 Ms/s在不同的带宽下。
因此,需要在发送端通过FFT变换,把采样点转换成适用于N210的采样点。
举个例子,在5MHz带宽的信道下,每帧有7680个采样点,为了适用N210,可以通过7680FFT+5000FFT的混合基进行变换。
下面是OAI maillist里的一段话。
For example, in a 5 MHz channel we generate 7680 samples per subframe. On the N210, this could be compressed to 5000 using a 7680-point FFT followed by a 5000 point IFFT with input compression (zero-removal). Today we don't have these mixed-radix FFTs, but it can be done, say with FFTW (initially) or later by adding them to the fixed-point tools in OAI. For the other sampling multiply the DFT sizes by 2 and 4.
最后
以上就是忧虑高山为你收集整理的USRP N210在OAI平台上应用需要考虑的问题的全部内容,希望文章能够帮你解决USRP N210在OAI平台上应用需要考虑的问题所遇到的程序开发问题。
如果觉得靠谱客网站的内容还不错,欢迎将靠谱客网站推荐给程序员好友。
发表评论 取消回复