Hello,

I'm doing a path loss calculation for ultrawideband technology to find the required transmit power to reach minimum receiver sensitivity at a
receiver. I'm calculating it as:

Txpower = MIRSdBm - GtdBi - GrdBi + 20

where:

MIRSdBm = -85 GtdBi = 6 GrdBi = 6 freq = 3.5 GHz PLE = 1.5 distance = 3 metres

I'm getting Txpower values of -46.5 dBm or correspondingly .0195 uW. Using this transmit power, I'm calculating the corresponding transmission rate:

R = w

where: w = 500 MHz (using ultrawideband) transmitPower = .0195 uW H = 1.4099e-004 is the channel gain Noise = 3.6900e-021 Interference = 0 (initial condition)

I'm getting rates of over 650 Mbps! I know that ultrawideband rates can reach 500 Mbps so this isn't much of a stretch considering initial state of no interference. However, the parameters that I am using conform to the proposed Zigbee over UWB PHY standard with a maximum data rate of about 27 Mbps. So here there is a huge difference. I don't really know what to make of it.

Can anybody point me in the right direction?

Thanks in advance.

I'm doing a path loss calculation for ultrawideband technology to find the required transmit power to reach minimum receiver sensitivity at a

Txpower = MIRSdBm - GtdBi - GrdBi + 20

***log10(4***pi* (freq) / (3E8)) + 10***PLE***log10(distance)where:

MIRSdBm = -85 GtdBi = 6 GrdBi = 6 freq = 3.5 GHz PLE = 1.5 distance = 3 metres

I'm getting Txpower values of -46.5 dBm or correspondingly .0195 uW. Using this transmit power, I'm calculating the corresponding transmission rate:

R = w

*** log2 (1 + (transmitPower ***H / (w * Noise + Interference))where: w = 500 MHz (using ultrawideband) transmitPower = .0195 uW H = 1.4099e-004 is the channel gain Noise = 3.6900e-021 Interference = 0 (initial condition)

I'm getting rates of over 650 Mbps! I know that ultrawideband rates can reach 500 Mbps so this isn't much of a stretch considering initial state of no interference. However, the parameters that I am using conform to the proposed Zigbee over UWB PHY standard with a maximum data rate of about 27 Mbps. So here there is a huge difference. I don't really know what to make of it.

Can anybody point me in the right direction?

Thanks in advance.