CC2640R2F采集IQ数据完整性问题

user6245249

Prodigy 30 points

Other Parts Discussed in Thread: CC2640R2F

工程师您好

我们使用CC2640R2F中遇见两个问题，请麻烦指教一下：

问题1：基于蓝牙4.2协议，已经成功提取IQ值，但是只能读取512组IQ采样数据，如何读取payload部分31B的完整IQ值？

问题2：IQ值读取是否与协议版本有关，是否支持蓝牙5协议？

6 年多前

0 Viki Shi 6 年多前

TI__Guru**** 188340 points

The I/Q sampling rate is configurable and can be up to 4 MHz. Each I/Q pair occupies 32 bit space in radio RAM and the radio RAM can only store up to 2KB(2048 bytes).

Therefore with sampling rate 4MHz, there will be 16 I/Q pairs every 4us, which equals to 16 * 4(one I/Q pair takes up 4 bytes space) = 64 bytes per 4us.

That means even if the CTE is 160us long with 4MHz sampling rate, the radio RAM can only store I/Q data for 128us duration. To ensure that I/Q sample are captured till the end of the tone, we should consider decrease the sampling rate to cover this case.

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