The SNR is defined as the ratio of symbol power to the noise power, i.e., E s /N0.
In contrast, there is a significant change in pSTRamp/PIIamp ratio (∗ symbol) indicating a specific loss in the pSTR generator, the ganglion cells.
Figure 10 a The ratio τ870/τ720 (symbols) of the τd λdet) measured under quasi-resonant (λexc = 870 nm) and non-resonant (λexc = 720 nm) excitations.
Lemma 2 shows that the recovery probability of each Layer i will increase with N when a certain ratio of symbols are received, as long as the ratio is more than r i.
As B, Ts, and Tb are known constant values in BT, the SNR can directly be referred to the SNR ratios per symbol (γs) and bit (γb), defined as [29] γ s = E s N 0 (3) γ b = E b N 0 (4).
Furthermore, the log-likelihood ratio (LLR) of symbol (mathcal {S} eta)) at each symbol position s k can be expressed as llr(s_{k}=mathcal{S} eta)|mathbf{y})=log left(frac{Pr(s_{k}=mathcal{S} eta)|mathbf{y})}{1-Pr(s_{k}=mathcal{S} eta)|mathbf{y})}right).
We approximate probability p by the actual ratio of each symbol to the number of symbols in the string, p= i/ l, so entropy = − ∑ all symbols (i / l ) log 2 (i / l ).
Instead of implementing the Raptor code as defined in [17], we model it by defining that a Raptor code block can be decoded, if the ratio of received symbols to all symbols in a code block is at least the number of source symbols plus 3% code specific symbol overhead.
The formulas derived above allowed testing of different configurations of the system, including the number of active connections, the ratio of uplink symbols to downlink symbols and the modulation and coding used for the data being sent.
Using the mathematical model we presented in Section "Proposed combined WiMAX/DSRC system", we were able to test different configurations of the system, including the number of active connections, the ratio of uplink symbols to downlink symbols and the modulation and coding used for the data being sent.
Table 2 Simulation parameters in [[10]] Parameter Value BS frequency 2.5 GHz Duplexing mode TDD System bandwidth 5 Mbps DL/UL ratio 2 1 (29:18 OFDM symbol) Frame length 5 ms Cyclic prefix duration 11.43 μ s Basic symbol 91.43 μ s FFT 1,024 PHY OFDMA DL permutation zone PUSC MAC PDU length Variable Fragmentation Enable ARQ and packing Disable DL-UL MAPS Variable.
