Fundamental limits on EMC

Radio Systems Parameters and Performance Criteria Concerning Computation and Mitigation of EMI Effects

“…The OOK modulation method, is common in radar but not in radio communica tion systems [4,14]. The OOK modulation method, is common in radar but not in radio communica tion systems [4,14].…”

“…AI is obtained by a weighting of signal and noise values over segments of the audio frequency baseband [19]. The marginal threshold for degrada tion of intelligibility corresponds to AI = 0.7 and the unacceptable threshold for an unus able signal corresponds to AI = 0.3, as shown in Figure 3 [14,17]. A three-grade indica tor for voice system performance includes the minimum interference acceptable threshold (MINIT), which indicates the boundary for a detectable interference which corresponds to AI = 1.0.…”

“…The Comité Consultatif International de Radio (CCIR; 15-Rec 562-2, Rep 520-1 and 405) introduces five-and sixgrade scales for speech quality and impair ment and a seven-grade comparison scale. From Figure 3, it is clear that a SIR of 10 dB provides satisfactory performance, AI > 0.4, for all presented cases even for an SNR of 20 dB [8,14]. For a carefully done test the AS is repeatable 68% of the time with a 2-dB spread [17,20].…”

“…The quality magnitude is generally expressed as picowatts at a point of zero relative level with psophometric weighting (PWop) or as decibels of a C-message weighted noise at 1 kHz above a refer ence noise level of -9 0 dBm in (OdBrncO) units [18,22]. In other analog systems, mean square or root-mean-square (rms) errors between the in put and output waveforms may be a suitable performance valuation parameter indicating a fidelity criterion [14]. For instance [8-(CCIR Ree.…”

“…The main Tx discrete spurious sources, shown in Figure 5, are as follows: carrier fre quency harmonics f H , master oscillator har monics, forward and back IMP, and in a few cases subharmonics at frequencies lower than the carrier [14,37].…”