Abstract
This chapter is dedicated to impulse radio as it is a very prominent form of UWB. Initially, impulse radio (IR) is introduced and generic transceiver architecture for IR is presented. Then, common and custom tailored pulse shapes for impulse radios are discussed. Various IR modulation techniques are presented and their performance is analyzed. To enable multiple accesses, a technique known as time hopping (TH) is introduced and it is integrated into various modulation techniques. Finally, the impact of the various antenna types on the transmitted and received UWB signal is investigated.
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Notes
- 1.
Examples of spectral masks are FCC masks presented in Chap. 1.
- 2.
“0” and “1” in case of a binary sources.
- 3.
The frame blocks corresponding to di-bit symbol d 1 d 0 (such as 11,10, 00,01) are given by
$$ \pm a_{i} \mathop \sum \limits_{k = 0}^{N - 1} w(t - kT_{f}) $$where
$$ a_{i} = 2\left( {2d^{1} - 1} \right) + 2d^{0} - 1\quad 1 \le i \le M/2 $$for M = 4.
Similarly, frame blocks corresponding to tri-bit symbol d 2 d 1 d 0 are given by
$$ \pm a_{i} \mathop \sum \limits_{k = 0}^{N - 1} w(t - kT_{f}) $$where
$$ a_{i} = 4\left( {2d^{2} - 1} \right) + 2\left( {2d^{1} - 1} \right) + 2d^{0} - 1\quad 1 \le i \le M/2 $$for M = 8.
As an example, the di-bit to amplitude mapping for M = 4 is shown below.
d 1 d 0
a i
00
−3
01
−1
10
1
11
3
- 4.
Hermitian pulses unlike modified Hermitian pulses (MHP) are not orthogonal.
- 5.
Could be either ‘1’ or ‘0’.
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Emami, S. (2013). Modulation Schemes and Multiple Access for Impulse Radio . In: UWB Communication Systems: Conventional and 60 GHz. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-6753-3_3
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DOI: https://doi.org/10.1007/978-1-4614-6753-3_3
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