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We propose a Widely Linear Multistage Wiener Filter (WL-MSWF) receiver to suppress the multi-user interference and the inter/intra-symbol interference in a high data rate Direct Sequence Ultra Wideband (DS-UWB) system. To this end, a non-circular modulation, e.g., Binary Phase Shift Keying (BPSK), is applied. We develop reduced-rank versions of the Least Mean Square (LMS) and the Recursive Least Squares...
A novel Narrowband Interference (NBI) suppression scheme using a Soft Limiter (SLM) is proposed for a digital noncoherent receiver in Time-Hopping Pulse Position Modulation Ultra Wideband (TH-PPM-UWB) communications. The NBI suppression is carried out in the analog domain (before the digital processing) via a feedforward structure. The suitability of this NBI suppression concept is confirmed by the...
We propose a b-bit non-coherent receiver based on a Digital Code Matched Filter (DCMF) for a low data rate Time- Hopping Pulse Position Modulation Ultra Wide Band (TH-PPMUWB) system. The DCMF follows after a high-speed but lowresolution (b-bit, 1 ≤ b ≤ 4) Analog-to-Digital Convertor (ADC) and is employed before the non-coherent detection. It is matched to the user-specific sequence and restricts the...
We consider a low data rate non-coherent impulse radio ultra-wideband (IR-UWB) system based on binary pulse position modulation (2-PPM), which applies sparse codes to enable code division multiple access (CDMA). The suitability of sparse codes (i.e., codes with a low code weight) is investigated considering multi-user interference (MUI) and multipath propagation. The decoding of the particular CDMA...
For UWB impulse radio transmission based on orthogonal pulse-position modulation, signal detection with non-coherent path diversity combing is analyzed. The performance of single- window and weighted sub-window combing is compared with the performance bound of non-coherent detection. This performance bound is derived using the maximum-likelihood decision rule. For numerical evaluations, measured UWB...
Wireless communications based on ultra-wide band and on infrared signals exhibit a number of similarities. From an application point of view, both techniques are attractive for short range indoor transmissions; from a technical one, IR and UWB show more analogies than one may expect. In this contribution we compare basic physical properties of both media. Non-directed IR transmission is always based...
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