Integrated Wireless-pon access Network Architectures Milos Milosavljevic


Chapter 6 Multi-Wavelength WiMAX-PONs with Overlapping Cells



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Chapter 6 Multi-Wavelength WiMAX-PONs with Overlapping Cells 
119 
6.3 Modified Network Models 
Similar to the previous chapter, a physical layer simulation test-bed was implemented using 
VPI, enriched in functionalities with MATLAB programming, to build an integrated simulation 
platform for the transmission of frequency shifted wireless channels over a multi-wavelength 
GPON with overlapping cells. Performance evaluation measures included EVM estimations at 
the remote antenna inputs for two base stations, and measurements of the WiMAX received 
power at the radio receiver in downstream and ONU/BS in upstream versus recorded BERs for 
various transmission distances of the proposed micro-cellular overlapping links. 
6.3.1 WiMAX Power Budget Analysis 
As described in chapter 4, the WiMAX transceivers are modeled to include the effect of 
wireless channel path loss based on data sheet parameters used in practical deployment 
scenarios. The power budget parameters of the implemented links for the transmission across 
the air are given in Table 6-1. The effective isotropic radiated power (EIRP), which is given by 
the maximum power from the power amplifier plus the antenna gain taking into consideration 
cable losses, is 40 dBm and 35 dBm for downstream and upstream respectively. The wireless 
channel propagation losses are varied between 100-120 dB to estimate the maximum 
transmission distance with respect to the calculated receiver sensitivity as it will be analysed in 
following sections.


Chapter 6 Multi-Wavelength WiMAX-PONs with Overlapping Cells 
120 
Table 6-1: Modeling parameters for practical wireless signals 
IEEE 802.16d WiMAX [13] 
Transmitters DW/UP 
Receivers DW/UP 
Modulation 
64- / 16-QAM 
SS_antenna gain 
17 dB 
Channel Bandwidth
20 / 10 MHz 
SS_cable loss 
1 dB 
RCE 
39 / 25 dB 
Noise figure 
4 dB 
Power at amplifier output 
25 / 20 dBm 
Noise in BW
-100.1 / -104 dBm 
BS_antenna gain 
17 dB 
SS noise floor 
-96.1 / -100 dBm 
BS_cable loss 
2 dB 
SNR_required 
24.4 / 18.2 dB 
BS_antenna height 
30 m 
Rx sensitivity for 
BER=1E-6
-71.7 / -81.8 dBm 
EIRP 
40 / 35 dBm 
Shadow margin 
8 dB 
Propagation Loss with Cat. 
B [14] 
100-120 dB 
6.3.2 OLT 
Specified by the OLT model in Figure 6-1, MZM were used to externally modulate 
commercially available DFB laser sources, having parameters as detailed in previous chapters, 
with WiMAX channels applied at modulator’s RF input. The DFBs output powers were set to 
account for various optical component losses, as shown in Table 6-2, producing the maximum 
lunched power of +3.2 dBm into the fiber [15]. 

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