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## Footnotes

### Chapter 2

1 The symbol period T is the amount of time over which a single data symbol is transmitted. Hence, the data rate in a digital transmission system is directly proportional to .

2 (·)T denotes the standard transpose operation.

3 For an ideal isotropic radiator, Gt = Gr = 1.

4 A positive real number x representing a ratio of powers can be expressed in dB as X = 10 log10 x dB, and is unitless. If a number y is a power in units of Watts (W) or z in milliwatts (mW), it could also be expressed as Y = 10log10 x dBW or Z = 10log10 x dBm, respectively, where 1 W = 1000 mW so 0 dBW = 30 dBm. Note also that in this lexicon x · y gives ...

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