Suppose your handset has a receive half-wave dipole antenna with G_r=2 (or 3.01 dBi )…. 1 answer below »

Suppose your handset has a receive half-wave dipole antenna with G_r=2 (or 3.01 dBi ). The base station (BS) transmits 500 mWatts of power using a transmit antenna with gain G_t=3 and the carrier frequency is 900 MHz. a) What is the ideal free space path loss at d =100m? b) Suppose that a technician takes the measurements along the circle at 100m away from the base station and got the average path loss to be around 68dB. Explain why does this number different from the answer in part a. c) Now, the base station is 1km from you, what is the received power in dBm? Should you use results in part (a) or part (b) to compute this? Explain. (Assume path loss exponent is 4) d) If the signal bandwidth is 1.25 MHz, what is the thermal noise power at the receiver with a BW=1.25 MHz and what is the SNR (Signal power to Noise power Ratio). For your information, the Boltzmann Constant is 1.38*10-23 Watt per Kevin per Hz and the temperature is 27°C. e) If the information bit rate is 1.25Mbps, what is the Eb/N0 (energy per bit over noise power spectral density level)? 2) Base Station (BS) A has three nearest neighbors, Cell B1,Cell B2 and Cell B3, using the same frequency channels. There is a mobile user (user A) in Cell A connected to the network via BS A. User A is 1km away from BS A and 5 km away from B1, B2 and B3. Consider the forward (or downlink) communication only and assume that the transmit power levels of BS A and all other 3 BSs are the same (500mWatts ) and that the PL(d0) when d0 = 100meter are also the same for all 4 cells. However, the path loss exponents of the paths connecting the mobile user A with Cell A and with Cell B3 are both equal to n=2 while the path loss exponents for other cells are n=3. Moreover, assume that the bandwidth is 200kHz, the temperature is 27°C (or 300K) and the mobile user A is using a receiver with a noise figure of 2.5dB. For your information, the Boltzmann Constant is 1.38*10-23 Watt per Kevin per Hz. a) What is the signal-power-to-interference-power ratio (SIR) experienced by mobile user A? b) Does the answer in part a) depends on the transmit power level? Why? c) What is the minimum transmit power level of Cell A if the minimum required SNIR of the handset is 10dB, assuming that the PL(100meter) = 85dB? d) If the bandwidth is 400 KHz instead, is there any change in SIR? SNIR? 3) Please determine if the following statement is true, false, or depends and provide the main reasons to support your answer. a) If the path loss model predicts that the path loss for download link is 50dB, the path loss predicted for the uplink should also be 50dB. b) Your cordless phone (working in 2.4GHz) is not working well due to interference from your WLAN (IEEE 802.11b) devices. This problem can be reduced by buying a more powerful antenna for your cordless





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