By Savo G Glisic

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K0 u + + + + x 1 2 . . . 8 Convolutional encoder. 2 ADAPTIVE AND RECONFIGURABLE CONVOLUTIONAL CODES In order to further increase the coding gain, a new class of codes, known as convolutional codes, is used [71–98]. 8. N blocks, k0 bits each, are used to produce a code word n 0 bits long. For every new input block a new code word is generated. 9) Submatrices Gi , containing k0 rows and n 0 columns, define connectivity of the ith block of the input register with n 0 elements of the output register.

17 A typical ideal received monocycle ωrec (t) at the output of the antenna subsystem as a function of time in nanoseconds. 18 A collection of received pulses in different locations [52]. 17. 18. The Ultra Wide Band radio will be discussed in detail in Chapter 8. In this section we will initially define only a possible signal format. 11) j=−∞ where t (k) is the kth transmitter’s clock time and T f is the pulse repetition time. The transmitted pulse waveform ωtr is referred to as a monocycle. 19 Spectrum of a TH signal.

11) j=−∞ where t (k) is the kth transmitter’s clock time and T f is the pulse repetition time. The transmitted pulse waveform ωtr is referred to as a monocycle. 19 Spectrum of a TH signal. 20 Spectra of (a) pseudorandom DS and (b) random DS signals. called a time-hopping sequence. This provides an additional time shift of c(k) j Tc seconds to the jth monocycle in the pulse train, where Tc is the duration of addressable time delay bins. For a fixed T f , the symbol rate, Rs , determines the number, Ns , of monocycles that are modulated by a given binary symbol as Rs = (1/Ns T f )s −1 .

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