Performance analysis of low complexity solutions for UWB low data rate impulse radio

2007 IEEE International Conference on Ultra-Wideband

Boudec³

et al. 2007

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.

“…The robustness of an energy detection receiver with an IR-UWB physical layer has been demonstrated in [3], [9]. Both [10] and [3] considered packet detection and timing acquisition.…”

Section: Related Workmentioning

confidence: 99%

“…Both [10] and [3] considered packet detection and timing acquisition. They exposed the excellent trade-off between complexity and performance of an energy detection receiver for IR-UWB.…”

Section: Related Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Flury¹,

2007 IEEE International Conference on Ultra-Wideband

Boudec³

et al. 2007

“…With a reasonable energy consumption and complexity, energy-detection receivers can exploit the multipath resistance of IR-UWB [1] and its ranging capabilities [2]. Hence, energy-detection receivers fit perfectly the objectives of IEEE 802.15.4a [3], which is an amendment to the IEEE 802.15.4 standard for low data-rate devices with an emphasis on very low complexity and power consumption.…”

Section: Introductionmentioning

confidence: 99%

Clock-offset tracking software algorithms for IR-UWB energy-detection receivers

Flury

2009 IEEE International Conference on Ultra-Wideband

Boudec

2009

Abstract-We present a clock-offset tracking algorithm for impulseradio ultra-wide band (IR-UWB) energy-detection receivers. There is a complexity versus performance trade-off for the design of IR-UWB energy-detection receivers: Extremely lowcomplexity energy-detection receivers are built with a large, constant integration duration; they are robust to clock drifts but are sensitive to noise enhancement effects and cannot adapt to channel variations. More sophisticated energy-detection receivers use a shorter integration duration and combine several weighted outputs of the energy collector; they are robust to noise enhancement effects, can adapt to channel variations and offer a much better performance than non-adaptive receivers. However, they become sensitive to clock offsets. Hence, there is a need for lowcomplexity clock-offset tracking solutions to support adaptive energy-detection receivers. Our solution is constructed around the Radon transform, an image processing tool traditionally used to detect line features in images. Our solution is fully compatible with the IEEE 802.15.4a standard, does not increase the hardware complexity of the receiver and reduces the performance loss due to clock offset to less than 0.5 dB.

Robust IEEE 802.15.4a energy detection receiver using statistical interference modeling

Flury

2009 Conference Record of the Forty-Third Asilomar Conference on Signals, Systems and Computers

Boudec

2009

Energy-detection is appealing for IEEE 802.15.4a receivers as it allows to exploit the ranging capabilities and the multipath resistance of impulse-radio UWB at a reasonable complexity. IEEE 802.15.4a receivers operate with interference created by uncontrolled piconets and an uncoordinated medium access control. Prior work showed that the performance of an energydetection based receiver is greatly degraded in such scenarios. Hence, we present an interference mitigation algorithm based on statistical interference modeling for energy-detection receivers. This combines a low complexity architecture and robustness to interference. Our performance evaluation shows that our solution decreases the packet error rate significantly.