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electromagnetic fields are present at the same time. Modes include Transverse Electric (TE), Transverse Magnetic (TM), and Transverse Electromagnetic (TEM). Details on various modes and how they affect field propagation may be found in vendor application notes. A simple rectangular chamber does not produce a uniform field throughout its volume. Wherever the EUT is physically located in the chamber, a different field strength exists, which leads to uncertainty of measurement. Within the chamber are metallic vanes that are inserted from adjacent walls and rotated at different speeds around an axis perpendicular to the wall. The time variation of the chamber geometry along with the rotation of the vanes produces a continuous variation of mode mixing with the same statistical distribution of field modes. Regardless of where the EUT is located within the chamber, the field intensity is uniform. Reverberation chambers are mainly used for military system testing such as Hazards of Electromagnetic Radiation to Ordnance (HERO), automotive applications, and large-EUT hardness testing at high field strengths. They are also used for commercial standards such as the volumetric uniformity requirements of IEC 61000-4-3 (EN 61000-4-3) and commercial avionics test standard RTCA/DO-160D. These chambers provide random, complex, real world conditions similar to the environments found in avionics bays and automobile engine compartments. Figure 4.19 illustrates the basic setup when performing tests within a reverberation chamber [2]. Both emissions and immunity can be performed with the same setup. When performing tests, additional connections must be made to the EUT to monitor its performance level or malfunction.

which relates the signal-to-noise power ratio to the SNR per bit, the spectral density of the additive noise, the data bit rate, and the occupied bandwidth The ratio of the transmission data rate to the occupied bandwidth, = Rb /W , is referred to as the bandwidth ef ciency of the modulation technique The ratio b = Eb /N0 is the SNR per bit, the quantity ordinarily used for calculation of the error rate of the system (The quantity Eb /N0 is sometimes referred to as the energy contrast ratio, because Eb and N0 both have units of energy) The ratio S/N is the received SNR parameter, which provides a measure of the transmitted power The parameters usually examined in evaluations of alternative modulation techniques are (1) the required minimum transmitted power for acceptable performance, and (2) the bandwidth ef ciency of the modulation technique.

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For a modulation technique with a bandwidth ef ciency of = 1 bit/s per hertz, we have S/N = Eb /N0 ; that is, the signal-to-noise power ratio is the same as the ratio of the energy per bit to the spectral density of the additive noise In the communications literature, different combinations of the measures of SNR described above are used, and the reader must have an accurate understanding of the various parameters in order to make proper comparisons among systems For example, the power ratio S/N is generally used in the satellite communications literature and is sometimes referred to as the carrier-to-noise ratio (CNR or C/N ) The energy ratio Es /N0 is the parameter ordinarily used in the literature on voiceband data communications Error Rate as a Performance Criterion.

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The standard performance criterion in digital communications is the probability of the bit error or bit error rate (BER) of a modem Some voiceband modem applications, such as the transfer of nancial data, permit error rates no greater than 10 5 , whereas other applications, such as digitized voice in cellular or mobile radio systems, will tolerate error rates as high as 10 2 to 10 3 Meanwhile, high- delity digital audio systems (eg, compact disk players) demand error rates on the order of 10 8 From the design standpoint, for a given modulation and coding scheme there is a one-to-one correspondence between the BER and the received signalto-noise power ratio S/N .

From a user standpoint, S/N is not the favorite criterion for the performance evaluation of digital communication links, because users measure the quality of a system by the number of errors in the received bits and prefer to avoid the technical details of modulation or coding However, using received S/N rather than BER will allow us to relate our performance criteria to the required transmitted power, which is very important for battery-operated wireless operations For analog communications the received S/N is the usual measure of performance quality An 18-dB S/N is typically required for analog mobile radio systems, and 30-dB S/N is expected in FM broadcasting systems In comparing analog and digital systems, we need to translate these performance criteria into a common basis that makes S/N the convenient criterion for comparing these systems In comparing digital systems with one another, the BER is used most of the time.

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