Partial Channel State Information and Intersymbol Interference in Low Complexity UWB PPM Detection

Zasowski, T.; Troesch, F.; Wittneben, A.

doi:10.1109/icu.2006.281578

Cited by 21 publications

(8 citation statements)

References 16 publications

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“…A number of algorithms have been developed recently to address the IFI/ISI mitigation problem for noncoherent UWB-IR. These algorithms focus mainly on equalization [4] and multiple symbol detection (MSD) or maximum likelihood sequence estimation (MLSE) [5], [6]. They either need CSI estimation or heavily rely on the post-detection signal processing, both results receivers with relatively high complexity.…”

Section: Introductionmentioning

confidence: 99%

Optimized Block Coded Noncoherent UWB Impulse Radio with IFI and ISI Pre-Mitigation

Gao

et al. 2010

2010 IEEE International Conference on Communications

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Existing inter-frame interference (IFI) and intersymbol interference (ISI) mitigation schemes for noncoherent UWB Impulse Radio (UWB-IR) mainly focus on signal processing after nonlinear autocorrelation receiver (AcR) or energy detector (ED). Steering the wheel, a simple but effective IFI and ISI premitigation scheme is proposed in this paper, which realizes IFI and ISI mitigation before ED. Block coded modulation is adopted and the pre-mitigation scheme relies on optimized block code design. The optimization jointly considers the signal interferencepatterns before ED and the properties of codewords. Thanks to the matching among codes, interference and detection scheme, leaked signal energy is partially used for detection. IFI and ISI mitigation is thus realized. It is showed in simulations that distinct performance improvement is achieved under moderate IFI and ISI.

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Section: Introductionmentioning

confidence: 99%

Optimized Block Coded Noncoherent UWB Impulse Radio with IFI and ISI Pre-Mitigation

Gao

et al. 2010

2010 IEEE International Conference on Communications

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“…The issue of UWB detection under ISI has recently been addressed for coherent receivers in [10], which proposes a modified Rake scheme with optimized finger delays and combining weights. As for the non-coherent receivers, instead, [11] designs a family of maximum likelihood (ML) symbol-wise detectors using different levels of CSI and a two-state postdetection ML sequence estimator (SE) with full knowledge of CSI. A nonlinear second-order Volterra system model prompts the development in [13] of algorithms with ISI mitigation capability, such as a MLSE with decision feedback and an adaptive inverse-modeling equalizer.…”

Section: Introductionmentioning

confidence: 99%

Inter-Symbol Interference Mitigation in High-Data-Rate UWB Systems

Lottici

Wu²,

Tian³

2007

2007 IEEE International Conference on Communications

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The design of ultra-wideband (UWB) impulse radio receivers has to cope with complex signal propagation environments with dense multipath fading, which complicate channel estimation and multipath energy capture. As the date transmission rate increases, additional interference between adjacent symbols arises which may further degrade the detector performance. To address these problems, this paper presents a multi-symbols differential detector that is capable of mitigating inter-symbol interference (ISI) without requiring training or costly channel estimation. A reduced-complexity implementation based on the Viterbi algorithm is proposed, which offers adjustable parameters to balance between performance and complexity. Simulations under typical indoor operating environments demonstrate that the proposed UWB detection scheme is remarkably robust against the effects of both channel noise and ISI.

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“…There are several proposals of energy detection receivers where the integration time is adapted [12], [13], [14], [15], [16]. There are more sophisticated approaches [6], [17], [18], where the authors take advantage of partial channel state information in general for designing the receiver (and not only adapting the integration time). The work in [6] is very similar to the concept of a channel mask that we use in this article.…”

Section: Related Workmentioning

confidence: 99%

Performance Evaluation of an IEEE 802.15.4a Physical Layer with Energy Detection and Multi-User Interference

Flury¹,

Merz

Boudec³

et al. 2007

2007 IEEE International Conference on Ultra-Wideband

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Abstract-We evaluate the performance of an IEEE 802.15.4a ultra-wide band (UWB) physical layer, with an energy-detection receiver, in the presence of multi-user interference (MUI). A complete packet based system is considered. We take into account packet detection and timing acquisition, the estimation of the power delay profile of the channel, and the recovery of the encoded payload. Energy detectors are known to have a low implementation complexity and to allow for avoiding the complex channel estimation needed by a Rake receiver. However, our results show that MUI severely degrades the performance of the energy detection receiver, even at low traffic rate. We demonstrate that using an IEEE 802.15.4a compliant energy detection receiver significantly diminishes one of the most appealing benefits of UWB, namely its robustness to MUI and thus the possibility to allow parallel transmissions. We further find that timing acquisition and data decoding both equally suffer from MUI.

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Partial Channel State Information and Intersymbol Interference in Low Complexity UWB PPM Detection

Cited by 21 publications

References 16 publications

Optimized Block Coded Noncoherent UWB Impulse Radio with IFI and ISI Pre-Mitigation

Optimized Block Coded Noncoherent UWB Impulse Radio with IFI and ISI Pre-Mitigation

Inter-Symbol Interference Mitigation in High-Data-Rate UWB Systems

Performance Evaluation of an IEEE 802.15.4a Physical Layer with Energy Detection and Multi-User Interference

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