Abstract
Early UWB concepts for communications have almost exclusively relied on impulse radio, where the whole available bandwidth, i.e., up to 7.5 GHz, is covered at once by means of very short pulses which are generated with a low duty cycle. Meanwhile, a bandwidth of 7.5 GHz is only available in the US [1, 3]. In Europe, the spectrum which is available with the same transmit power spectral density of -41.3 dBm/MHz ranges only from 6.0 to 8.5 GHz [4], if no detect and avoid techniques are applied1. A potential UWB system has therefore to be able to ’live’ with a mean transmit power of less than -7.3 dBm.
Highlights
The use of ultra wide band (UWB) signals can offer many advantages for communications
Non-coherent detection is not restricted to low data rates — even orthogonal frequency division multiplex (OFDM) can be combined with non-coherent modulation and detection [19] — we focus our attention on low data rate single carrier transmission
In [10] we have shown that weighted sub-window combining (WSubW-C) with Tsub = 4 ns outperforms single-window combining (SinW-C) by about 0.5 dB, if indoor channels are considered
Summary
The use of ultra wide band (UWB) signals can offer many advantages for communications It can provide a very robust performance even under harsh multipath and interference conditions, the capability of precision ranging and a reduced power consumption. Especially in non-LOS scenarios, a coherent RAKE receiver requires a very large number of RAKE fingers and a precise channel knowledge to efficiently capture the multipath energy. Such a coherent RAKE receiver will be very complex and costly, such that the hardware itself may consume a lot of power. Non-coherent receiver is clearly the dramatically reduced effort which is required for channel estimation, synchronization, and multipath diversity combining. We present well suited solutions for the analog-to-digital conversion, the spread-spectrum code sequences, and the modulation format
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