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This paper addresses the robustness of FM-UWB BAN radio to frequency-selective multipath and interference. Examples of the FM-UWB radio performance with IEEE802.15.6 BAN channel models are given. Robustness to interference is demonstrated and interference mitigation solutions at the physical layer of the receiver front-end are presented and illustrated with simulation results.
This paper presents an ultra-wideband (UWB) bandpass filter for UWB applications and notch filter for the purpose of reducing interference from the WLAN (802.11a) when it coexist with UWB radio system. The bandpass filter consists of a hexagonal shaped multiple mode resonator (MMR) with interdigital coupling at both sides. The notch filter consists of four identical open ended stubs nearby the MMR...
Electromagnetic interference can disrupt mobile satellite communications in both military and commercial mobile applications. Not only is this true when a high-power terrestrial source is in close proximity to a mobile satellite receiver, but it can be especially problematic when the vehicle or nearby vehicle has its own onboard interference source that overpowers the desired satellite signal. This...
A sub-band based ultra wideband (SUWB) system is proposed for energy efficient short range wireless communications. The proposed technique divides the bandwidth of 500 MHz into number of sub-bands that may be utilized for higher data rate or higher reliability or multi user access depending on system requirements. The energy efficiency is achieved by reducing the sampling rate requirements and also...
Since the coherent receivers are not feasible to implement low-cost ultra-wideband (UWB) impulse radio (IR) devices featuring extremely low power consumption, energy detector-based (ED-based) noncoherent receivers are more and more frequently chosen. The Pulse Polarity Modulation (PPM) scheme with a threshold compensated receiver is a promising candidate for the implementation of cheap and robust...
A sub-band based ultra wideband (SUWB) system is proposed. The technique provides scope for using the ultra wideband bandwidth efficiently by exploiting the available link margin for short range communications. The bandwidth of 500 MHz or more is divided into a fixed number of sub-bands. The data transmission scheme over multiple sub-bands can be designed to achieve higher data rate, higher reliability...
Ultra-wideband (UWB) communication systems are usually implemented by baseband spreading schemes relying either on time hopping (TH) or direct sequence (DS) codes. However these schemes are not suitable to cancel narrow band interference (NBI). Other approaches rely on digital single carrier spreading (SC) or multi-carrier (MC) spreading codes, offering flexibility in NBI cancellation.
Ultra Wide Band (UWB) communication systems are considered to be ideally suited for future indoor and short-range wireless communications with high-speed data rate, as they operate at low power, provide high capacity in dense multipath environments. Combining the energy received over multipath, RAKE receiver usually holds good performances in the UWB communications environment. However, interferences...
In this paper we consider the coexistence issue between OFDM-based WLANs of the 802.11a family and time-hopping ultra wideband (TH-UWB) systems. A general analytical expression is provided for the bit error rate (BER) of the OFDM transceiver operating in the presence of UWB interference and the interferences caused by the multipath propagation phenomenon on the 802.11a OFDM signal, comprising intersymbol...
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