Integrated Wireless-pon access Network Architectures Milos Milosavljevic

Figure 4-8: High power amplifier (HPA) modelling

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Chapter 4
To that extent, limiter amplitudes of 0.68V and 
figures, the maximum allowed for 64
performed based on back
wireless channel. The obtained spectrum at the output of the amplifier is shown 
clearly demonstrating the HPA 
of 31 dB [2].
4.4 Wireless Channel Modelling
Accurate implementation
propagation. Parameters that affect signal transmission across the air are typically 
and multipath delay spread. Therefore, the model must be carefully designed to account for 
these parameters if it was to 
established models for evaluating the performance of wireless channels
each designed for different scenarios and operational frequencies.
The most widely used sub
cellular environments is the Hata
Chapter 4 FDM Simulation Platform with Wireless Compatibility
77 
limiter amplitudes of 0.68V and -0.68V were required to 
maximum allowed for 64-QAM modulation in WiMAX 
performed based on back-to-back transmission of the OFDM signal in the absence of the 
wireless channel. The obtained spectrum at the output of the amplifier is shown 
the HPA signal distortion corresponding to a maximum achievable SNR 
Figure 4-9: Output spectrum from HPA 
 
4.4 Wireless Channel Modelling 
Accurate implementation of the wireless channel is fundamental in evaluating w
. Parameters that affect signal transmission across the air are typically 
and multipath delay spread. Therefore, the model must be carefully designed to account for 
if it was to implement realistic network scenarios. 
established models for evaluating the performance of wireless channels
each designed for different scenarios and operational frequencies. 
The most widely used sub-urban model for signal strength prediction and simulation in
cellular environments is the Hata-Okumura model [10]. This model applies only to