Elektrik - Elektronik Mühendisliği Bölümü Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12469/47

Browse

Browsing Elektrik - Elektronik Mühendisliği Bölümü Koleksiyonu by Journal "2011 IEEE International Conference on Ultra-Wideband (ICUWB)"

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • Thumbnail Image
    Conference Object
    Citation - WoS: 6
    Citation - Scopus: 9
    The Effect of Channel Models on Compressed Sensing Based Uwb Channel Estimation
    (IEEE, 2011) Başaran, Mehmet; Erküçük, Serhat; Çırpan, Hakan Ali
    Ultra-wideband (UWB) multipath channels are assumed to have a sparse structure as the received consecutive pulses arrive with a considerable time delay and can be resolved individually at the receiver. Due to this sparse structure there has been a significant amount of interest in applying the compressive sensing (CS) theory to UWB channel estimation. There are various implementations of the CS theory for the UWB channel estimation based on the assumption that the UWB channels are sparse. However the sparsity of a UWB channel mainly depends on the channel environment. Motivated by this in this study we investigate the effect of UWB channel environments on the CS based UWB channel estimation. Particularly we consider the standardized IEEE 802.15.4a UWB channel models and study the channel estimation performance from a practical implementation point of view. The study shows that while UWB channel models for residential environments (e. g. CM1 and CM2) exhibit a sparse structure yielding a reasonable channel estimation performance channel models for industrial environments (e. g. CM8) may not be treated as having a sparse structure due to multipaths arriving densely. The results of this study are important as it determines the suitability of different channel models to be used with the CS theory.
  • Thumbnail Image
    Conference Object
    Citation - WoS: 1
    Citation - Scopus: 1
    Performance of Ieee 802.15.4a Systems in the Presence of Narrowband Interference
    (IEEE, 2011) Fındıklı, Çağlar; Erküçük, Serhat; Çelebi, Mehmet Ertuğrul
    The regulatory agencies in Europe and Japan require the implementation of avoidance techniques in some bands to reduce interference to licensed systems. Accordingly ultra-wideband impulse radio (UWB-IR) based Wireless Personal Area Network (WPAN) standard IEEE 802.15.4a has suggested using linear combination of pulses to reduce interference to coexisting primary systems. In this paper we consider the implementation of linear combination of pulses for a peaceful coexistence and assess the UWB-IR system performance in the presence of an active narrowband system. For that we study the possible transmitter and receiver structures that can be adapted for the physical layer of the IEEE 802.15.4a standard. The study shows that while the bit-error rate (BER) performances of coherent and noncoherent receiving structures may be slightly degraded with the use of linear combination of pulses when there is no active primary system the performances can be significantly improved with appropriate filtering techniques at the receiver when the primary system is active.