Modem parameters further practical considerations Sample Clauses

Modem parameters further practical considerations. The required bandwidth to achieve the throughputs which are green-coloured in Table 1 using a single carrier modem type of implementation is shown in Figure 2. The assumptions for this calculation are listed in Table 2. From the conditions in Table 2, the CNR at the receiver can be calculated. The baud rate is 1/1.2 times of bandwidth assuming 20% of roll-of-factor. Also, assuming around 4 dB coding gain of FEC, the best modulation scheme (efficiency) can be selected. The throughputs are calculated from the baud rate, the payload rate, and modulation scheme (efficiency). The throughput is not proportional to the bandwidth since the bandwidth expansion causes SNR degradation. According to Figure 2, around 30 GHz bandwidth is necessary for over 100 Gbps. The 30 GHz bandwidth is available in 300 GHz-band. In the following discussion, 30 GHz bandwidth is assumed. Figure 2 Bandwidth vs. Throughput for the best efficiency (single carrier modem) Table 2 Assumptions for Throughput Calculation Parameter Value Remarks RF Frequency [GHz] 300 Baud Rate [Gbaud] BW/1.2 due to 20% roll-off, BW in GHz units NF [dB] 10 T=300 K TX Power [dBm] 10 Link Distance [m] 1000 Antenna Gain [dBi] 50 Common for both TX and RX Payload Rate 0.9 Payload/Frame length Currently, such a wide-band modem as described in Table 2 is not available since it requires ultra- high speed data converters (DAC, ADC) and a digital signal processor. A multi-carrier configuration, a combination of multiple current V or E-band modems can be applied to ThoR project by combining them together as an FDMA signal. The total throughput is calculated as a summation of all of the individual single carrier modem throughputs. As a result, in the terahertz band, over 100 Gbps throughput can be achieved using available modems. For the scenario of identical TX-power, multi-carrier configuration combined via a single amplifier, the peak factor, i.e. ratio of peak power and average power (PAPR) increases. This increase is in the worst case (i.e. at a point where all the carriers have similar phase) proportional to the number of carriers. For example, in case of two carriers, the average power increases 3 dB, however the peak power increases 6 dB when the maximum amplitude appears for the both carriers at the same time. Therefore, the peak factor increases by 3 dB. This is the mathematical worst case. The time rate of the worst state is extremely small due to the randomness of the transmitted data. The TX power may have t...
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