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By Savo G Glisic

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All of these schemes will be discussed in detail in Chapter 7. 5 Ultra wide band (UWB) signals For the multipath resolution in indoor environments a chip interval of the order of a few nanoseconds is needed. This results in a spread spectrum signal with bandwidth in the order of a few GHz. Such a signal can also be used with no carrier, resulting in what is called impulse radio (IR) or Ultra Wide Band (UWB) radio. 17 A typical ideal received monocycle ωrec (t) at the output of the antenna subsystem as a function of time in nanoseconds.

14 shows the modification to ensure frequency non-selective fading, where TS denotes the original symbol duration, and the original data sequence is first converted into P parallel sequences, and then each sequence is mapped onto G MC subcarriers (NC = P × G MC ). The multicarrier DS-CDMA transmitter spreads the S/P-converted data streams using a given spreading code in the time domain so that the resulting spectrum of each subcarrier can satisfy the orthogonality condition with the minimum frequency separation.

This is the focus of the presentation in this chapter and for the conventional details related to channel coding the reader is referred to the classical references in the field. 1 ADAPTIVE AND RECONFIGURABLE BLOCK CODING The simplest way to improve the probability of correct detection of a bit is to repeat the transmission of the same bit (repetition code) and base the detection of the bit on so-called majority logic. As an example, if each bit is repeated three times, the decoder will base the decision on the observation of the three bits.

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