Space–Time Coding for Multiuser Ultra-Wideband Communications

Ultra Wideband Systems with MIMO

“…In [251], the performance of a space-time trellis code for a 2 × 2 UWB-MIMO system is evaluated. For general IR-based UWB systems, the STC method was provided in [6,7,8,225]. For OFDM-based UWB systems, [227] presented an STC method which was essentially similar to the STC for wideband OFDM.…”

“…The measurements were performed in an office environment in IMST GmbH 8 The frequency response of the channel (including the transmit and receive antennas as a part of the whole channel) is measured by a VNA across the frequency range from f 1 = 1 GHz to f m = 11 GHz with a sampling interval f = 6.25 MHz. The inverse Fourier transform is used to obtain the channel impulse response.…”

“…A few papers have addressed the issue of exploiting transmit diversity for IR-based UWB systems; for example, see [8,258,260,273]. In [260], the performance of pulseamplitude-modulated signals in a UWB-MIMO channel is evaluated.…”

“…The STC scheme in [273] is similar to the Alamouti STC scheme for narrowband systems, which is easy to implement. In [8], a general STC scheme for M-ary PAM and PPM UWB systems is proposed based on cyclic division algebra theory. However, it was shown that energy-efficient codes are possible only for two transmit antennas.…”

Multiple-Input Multiple-Output Antennas for Ultra Wideband Communications

“…Hence, using MIMO together with UWB helps in extending the communication range as well as offers higher link reliability. The benefits of UWB-MIMO can be summarized as following [7]- [8]: interference mitigation/suppression, higher data rates, improved link quality, extended coverage, reduced analog hardware requirements, and concurrent localization. Apart from these benefits, there are also challenges for the joint implementation of UWB and MIMO.…”