Biomedical Engineering Reference
In-Depth Information
4.5 Conclusion
This chapter gives a brief introduction for some of the commonly used transceiver
architectures used in UWB hardware implementations. Three types of pulse
generators used in UWB transmitter developments are discussed, namely: base
band pulse generators, up-conversion based pulse generators and waveform syn-
thesis pulse generators. Among these three pulse generation methods, up-con-
version based pulse generation method provides significant advantages in terms of
low power consumption and simple design. This method can be considered as a
suitable design technique for UWB transmitters. Waveform synthesis pulse gen-
erators generate pulses directly in the intended frequency range of an UWB
application without using an intermediate base band stage. They are more complex
in design compared to the up-conversion method. This type of pulse generators can
be considered as a suitable design technique for IC based power efficient UWB
hardware designs.
UWB receivers are inherently complex in design compared to UWB trans-
mitters. This is mainly because of the fact that UWB receivers have to receive low
power narrow UWB signals and have to perform functions, such as precise syn-
chronization of narrow UWB pulses. There are two main realizations of UWB
receivers: coherent receivers and non-coherent receivers. Non-coherent UWB
receivers are better suited for WBAN applications mainly due to less complex
hardware design and low power consumption. Out of the non-coherent UWB
receivers, ED receivers are preferable over the AcR receivers, especially for short-
range applications where a strong Line-Of-Sight (LOS) is present. This is mainly
due to the fact that AcR receivers require the synthesis of precise delay lines,
which leads way to complex hardware synthesis.
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