# A Novel Bitrate Adaptation Method for Heterogeneous Wireless Body Area Networks
## 5 Simulation Studies and Analysis of the Obtained Results
### Simulation Results
The gains of using the available time-frequency resources, \(\Delta RMS\), by applying the AMASD algorithm, in relation to the second best one, in terms of the efficiency (that should be understood as the useful throughput increase), is \(\Delta RMS_{HE}\ =\ 8\) kbps (12%), \(\Delta RMS_{TO}\ =\ 8.2\) kbps (31%), and \(\Delta RMS_{AB}\ =\ 9.7\) kbps (18%) for the NB interface, and \(\Delta RMS_{HE}\ =\ 369.4\) kbps (37%), \(\Delta RMS_{TO}\ =\ 509.4\) kbps (35%), and \(\Delta RMS_{AB}\ =\ 635.1\) kbps (48%) for the UWB interface. The influence of a rapid change in the system loss, which was detected by the algorithm, is clearly visible and the bitrates of the subsequent transmission were adjusted to the current radio channel parameters. In summary, the results obtained for the variable propagation conditions have proved the usefulness of the proposed AMASD method regardless of the MN placement in the heterogeneous WBAN. It was also indicated that other algorithms (in particular, LA MOD and ARF) can be used  
\begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline \multirow{2}{*}{**NB**} & \multicolumn{3}{c}{**RMS (kbps)**} & \multicolumn{3}{c}{**R\({}_{\text{MEAN (kbps)}}\)**} & \multicolumn{3}{c}{**PER**} \\ \cline{2-10}  & \(\mathbf{HE_{R}}\) & \(\mathbf{TO_{F}}\) & \(\mathbf{AB_{L}}\) & \(\mathbf{HE_{R}}\) & \(\mathbf{TO_{F}}\) & \(\mathbf{AB_{L}}\) & \(\mathbf{HE_{R}}\) & \(\mathbf{TO_{F}}\) & \(\mathbf{AB_{L}}\) \\ \hline
10 kbps & 154.71 & 193.76 & 175.14 & 9.98 & 9.99 & 9.99 & \(1.6\times 10^{-3}\) & \(6.1\times 10^{-4}\) & \(1.5\times 10^{-3}\) \\
48 kbps & 116.49 & 154.83 & 136.65 & 47.68 & 47.94 & 47.87 & \(7.1\times 10^{-3}\) & \(1.3\times 10^{-3}\) & \(2.9\times 10^{-3}\) \\
86 kbps & 81.65 & 115.88 & 99.34 & 81.30 & 85.91 & 84.42 & \(5.7\times 10^{-2}\) & \(1.0\times 10^{-3}\) & \(2.0\times 10^{-2}\) \\
124 kbps & 64.56 & 76.90 & 69.12 & 96.47 & 123.90 & 112.28 & \(2.3\times 10^{-1}\) & \(8.1\times 10^{-4}\) & \(1.0\times 10^{-1}\) \\
162 kbps & 86.22 & 39.31 & 67.98 & 77.31 & 160.54 & 118.14 & \(5.2\cdot 10^{-1}\) & \(9.5\times 10^{-3}\) & \(2.8\times 10^{-1}\) \\
200 kbps & 127.22 & 27.98 & 97.17 & 35.67 & 177.97 & 95.21 & \(8.2\times 10^{-1}\) & \(1.1\times 10^{-1}\) & \(5.3\times 10^{-1}\) \\ ARF & 64.89 & 27.53 & 54.68 & 66.08 & 178.24 & 127.38 & \(2.5\times 10^{-1}\) & \(1.0\times 10^{-1}\) & \(2.2\times 10^{-1}\) \\ LA & 68.14 & 27.65 & 57.01 & 92.93 & 177.63 & 125.45 & \(2.3\times 10^{-1}\) & \(8.2\times 10^{-2}\) & \(1.9\times 10^{-1}\) \\ LA MOD & 65.12 & 26.12 & 54.11 & 95.81 & 178.30 & 127.92 & \(1.2\times 10^{-1}\) & \(5.9\times 10^{-2}\) & \(1.1\times 10^{-1}\) \\ ALBS & 127.09 & 28.26 & 96.71 & 35.81 & 177.54 & 95.82 & \(8.2\times 10^{-1}\) & \(1.1\cdot 10^{-1}\) & \(5.2\times 10^{-1}\) \\ ALBS MOD & 96.22 & 31.31 & 74.87 & 66.15 & 170.26 & 112.19 & \(6.1\times 10^{-1}\) & \(6.4\times 10^{-2}\) & \(3.6\times 10^{-1}\) \\ AMASD & **56.85** & **17.91** & **44.40** & **109.91** & **185.33** & **138.21** & **99.9\(\times 10^{-2}\)** & **3.3\(\times 10^{-2}\)** & **8.0\(\times 10^{-2}\)** \\ \hline \multirow{2}{*}{**UWB**} & \multicolumn{3}{c}{**RMS (kbps)**} & \multicolumn{3}{c}{**R\({}_{\text{MEAN (kbps)}}\)**} & \multicolumn{3}{c}{**PER**} \\ \cline{2-10}  & \(\mathbf{HE_{R}}\) & \(\mathbf{TO_{F}}\) & \(\mathbf{AB_{L}}\) & \(\mathbf{HE_{R}}\) & \(\mathbf{TO_{F}}\) & \(\mathbf{AB_{L}}\) & \(\mathbf{HE_{R}}\) & \(\mathbf{TO_{F}}\) & \(\mathbf{AB_{L}}\) \\ \hline
6800 kbps & 1004.4 & 1515.99 & 1078.99 & 5287.88 & 3755.79 & 4538.67 & \(2.3\times 10^{-1}\) & \(4.5\times 10^{-1}\) & \(3.4\times 10^{-1}\) \\
850 kbps & 5399.1 & 4621.95 & 4972.74 & 819.03 & 798.05 & 801.99 & \(4.0\times 10^{-2}\) & \(6.4\times 10^{-2}\) & \(5.9\times 10^{-2}\) \\ ARF & 1070.2 & 1445.87 & 1330.66 & 5368.00 & **4013.90** & **4634.12** & **9.8\(\times 10^{-2}\)** & **1.9\(\times 10^{-1}\)** & **1.6\(\times 10^{-1}\)** \\ LA & 1188.2 &in these networks interchangeably, depending on the scenario.