A NEW IR-UWB PULSE FOR THE COMPATIBILITY OF IEEE802.11.a WLAN AND IR-UWB SYSTEMS

Abstract

A new ultra wideband (UWB) pulse shape is proposed to mitigate coexistence issues of IEEE802.11.a WLAN and impulse radio UWB (IR-UWB) systems. The proposed method is applicable to the reduction of mutual interference of UWB and any given narrowband (NB) systems. This pulse shape is based on frequency up-converting of the first derivative of the Gaussian pulse which has an adjustable null in power spectral density (PSD) depending on the up-converting frequency. Analytical and simulation results show that both UWB and WLAN systems have noticeable improved performance when using the proposed pulse in comparison with using conventional modulated Gaussian (MG) pulse in UWB system. The new pulse does not reduce the throughput of the UWB system and does not require modification of the NB system. The proposed transmitter circuit block diagram has been presented at the conclusion.

A new UHF/ultra wideband‐radio frequency identification system to solve coexistence issues of ultra wideband‐radio frequency identification and other in‐band narrowband systems

“…In the proposed architecture, a monocycle pulse (Figure 1A) is up‐converted to f tx using a mixer (Figure 1B), where f tx is the local frequency of the transmitter. Therefore, an adjustable null is created in the frequency spectrum 29 . Time and frequency domain plots of the monocycle and UCM pulses are depicted in Figure 1C.…”

“…Shown in Reference 29, using the UCM pulse can mitigate the mutual interference between in‐band UWB and NB systems around 40 dB (Figure 3). In the figure, the UCM and up‐conversion of the Gaussian pulses are noted as modulated monocycle (MM) and modulated Gaussian (MG) pulses, respectively.…”

“…BER performance of UWB system when using up‐conversion of the Gaussian pulse (noted as MG pulse) and UCM pulse (noted as MM pulse) in presence of WLAN interference 29 …”

“…In this paper, a new architecture for the UHF/UWB hybrid RFID system is presented that can reduce the coexistence issues of UHF/UWB hybrid RFID and other NB band systems, like IEEE802.11.a WLAN. This architecture is based on the UCM pulse proposed in References 29,30. Also, we show analytically that the reader's frequency in a phase‐locked loop (PLL) can lock on the null frequency of the input signal, transmitted by tag.…”

“…The first derivative of the Gaussian pulse is the so‐called monocycle. Up‐conversion of the monocycle (UCM) pulse, which contains a null in spectrum, was proposed in Reference 29. It was shown that using this pulse, UWB, and WLAN systems improved their performance (about 40 dB) compared to a conventional modulated Gaussian pulse.…”