Abstract
The European Commission has recently adopted specific power spectral density masks for ultra wideband (UWB) devices, with detect and avoid capabilities, for coexistence with licensed standards. Under these regulations, a novel approach for analyzing the UWB interference effects on the WiMAX downlink is provided in this paper by means of a novel theoretical computation of the bit error rate (BER), simulation results, and measurements in a conducted modality. New analytical BER expressions for both uncoded and coded WiMAX systems, impaired by a single multiband-OFDM (MB-OFDM) UWB interference signal, are obtained in this paper for a Rayleigh fading channel. The BER is expressed in terms of the characteristic function of the interference signal. The maximum permissible interference levels and the signal-to-interference (SIR) values, which allow the UWB interference effects to be considered negligible, are estimated in this paper from simulation and measurement results. The analysis considers a WiMAX receiver operating at its minimum sensitivity level. The BER, the symbol error probability (SEP), and the error vector magnitude (EVM) of the WiMAX link are the metrics employed to characterize the interference effects for both frequency hopping and nonfrequency hopping UWB interferers.
Highlights
The demand for reliable, fast, and low-cost data communications services for all types of wireless applications and environments has increased rapidly in the last few years
ultra wideband (UWB) technology is established as a viable candidate for future wireless personal area networks (WPANs) that require the processing of information with low-power sources at very high speeds across short distances [1]
In order to correctly assess the effect of the interference signal on the victim service, as the only source of distortion, the additive white Gaussian noise (AWGN) noise contribution is considered negligible in this simulation scenario (SNR → ∞)
Summary
The demand for reliable, fast, and low-cost data communications services for all types of wireless applications and environments has increased rapidly in the last few years. A maximum mean effective isotropic radiated power (EIRP) spectral density of −41.3 dBm/MHz is established over all the 7.5 GHz operation bandwidth Under these initial conditions, UWB devices can cause harmful interference to primary services operating simultaneously in their vicinity. In DAA mode, the UWB device detects and estimates the power level of the WiMAX service and dynamically adapts its EIRP level depending on the zone of operation This coexistence operation is reflected, in which the power threshold levels are between zones −38 dBm and −61 dBm. The maximum mean EIRP spectral density levels are −41.3 dBm/MHz, −65 dBm/MHz and −80 dBm/MHz for zones 1, 2, and 3, respectively. In this paper, (·)∗, E{·}, R{·}, I{·}, P{·}, and ⊗ denote complex conjugation, statistical expectation, the real part of a complex number, the imaginary part of a complex number, the probability of an event, and the convolution operator, respectively
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