Distance between Tx and Rx and affect on error rate

We are interested in the typical range figures in Fig31 of the DW1000 datasheet - but it doesn’t indicate what the Bit Error Rate (BER) is at the SPI interface - or even what Packet Error Rate (PER) is assumed. It obviously makes a big difference in range if it is quoted at 10% PER then to get say a usable SPI BER of say 1^10-5 you would have to back off the sensitivity by about 10dB (Figures 5-10 of the same specification) dramatically reducing the range. Anybody know? Many thanks in advance everyone