Flexible Spectrum Control and Receiver Performance Improvement Technologies for B3G Wireless Systems

Author(s):  
Seiichi Sampei ◽  
Shinsuke Ibi
2012 ◽  
Vol E95.B (8) ◽  
pp. 2631-2637 ◽  
Author(s):  
Xuesong MAO ◽  
Daisuke INOUE ◽  
Hiroyuki MATSUBARA ◽  
Manabu KAGAMI

2014 ◽  
Vol 65 (4) ◽  
pp. 203-212
Author(s):  
David Levy ◽  
Ivan Kotuliak ◽  
Peter Trúchly

Abstract For wireless systems, it is of vital importance to use the scarce radio resources in an efficient way. The main targets are to reduce the power consumption and increase the throughput of wireless devices. Using header compression both throughput can be increased and power can be saved. Using packet overhearing reduction power can be saved. This paper presents the achieved performance improvements when using these two methods. The simulation results are confirmed by analytical calculations. We show that we can achieve up to 35% power save when combining both methods and close to 0.1 additional normalized throughput.


2021 ◽  
Author(s):  
Alston L. Emmanuel ◽  
Xavier N. Fernando

This thesis focuses on transmitted-reference ultra wideband (TR-UWB) systems coexistence with IEEE802.11a WLAN systems. TR-UWB systems can relax the difficult synchronization requirements and can provide a simple receiver architecture that gathers the energy from many resolvable multipath components. However, UWB TR systems are susceptible to interference which comes from other wireless systems. In this thesis, TR-UWB system performance is studied in the presence of strong IEEE 802.11a WLAN interference in both AWGN and IEEE channel model. In order to reduce both the effects of interference by and into UWB signals, we propose a new method in conjunction with a multi-carrier type transmission pulse using wavelet analysis and notch filtering. Using wavelet analysis, spectral density of the transmitted UWB signal around the interfering band is reduced by 60 dB lower than the peak. With the modified TR-UWB receiver, the TR-UWB system shows performance improvement in the presence of strong IEEE 8-2.11a interference in both AWGN and IEEE channel models. The proposed method can be used for the coexistence of different wireless systems with UWB system.


2012 ◽  
Vol 53 (18) ◽  
pp. 7-12
Author(s):  
Gamal MabroukAbdel-Hamid ◽  
Sahar Abdel-Rahman ◽  
Hala Gaber Farrag

2006 ◽  
Vol 16 (1) ◽  
pp. 17-19
Author(s):  
Nenad Milosevic ◽  
Bojan Dimitrijevic ◽  
Zorica Nikolic

The rejection of QPSK interference in a THPPM UWB system using complex adaptive filter and a nonlinear correlation receiver (NCR) with a soft-limiter will be considered in this paper. This system brings a significant performance improvement compared to the system which uses complex adaptive filter and a linear receiver, particularly in the case of high interference power, where its absence leads to the reception loss.


2021 ◽  
Author(s):  
Alston L. Emmanuel ◽  
Xavier N. Fernando

This thesis focuses on transmitted-reference ultra wideband (TR-UWB) systems coexistence with IEEE802.11a WLAN systems. TR-UWB systems can relax the difficult synchronization requirements and can provide a simple receiver architecture that gathers the energy from many resolvable multipath components. However, UWB TR systems are susceptible to interference which comes from other wireless systems. In this thesis, TR-UWB system performance is studied in the presence of strong IEEE 802.11a WLAN interference in both AWGN and IEEE channel model. In order to reduce both the effects of interference by and into UWB signals, we propose a new method in conjunction with a multi-carrier type transmission pulse using wavelet analysis and notch filtering. Using wavelet analysis, spectral density of the transmitted UWB signal around the interfering band is reduced by 60 dB lower than the peak. With the modified TR-UWB receiver, the TR-UWB system shows performance improvement in the presence of strong IEEE 8-2.11a interference in both AWGN and IEEE channel models. The proposed method can be used for the coexistence of different wireless systems with UWB system.


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