Equalization for DS-UWB Systems—Part I: BPSK Modulation

Parihar, Ambuj; Lampe, Lutz; Schober, Robert; Leung, Cyril

doi:10.1109/tcomm.2007.898836

Cited by 43 publications

(25 citation statements)

References 28 publications

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“…The proposed positioning system is built based on the time difference of arrival (TDOA) positioning principle [8], BPSK modulation [9], and autocorrelation of spread spectrum (DSSS) technique [10], and can be implemented by the following procedure (as shown in Fig.1 Carrier Figure 1. UHF band narrowband wireless positioning system flow chart.…”

Section: System Modelmentioning

confidence: 99%

Wavelet Autocorrelation and Denoising of Spread Spectrum Signal for Narrowband Wireless Indoor Positioning

Wenyang¹,

Luo²

2017

dtetr

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Abstract. Channel noise is a key factor that affects the measurement accuracy of narrowband wireless indoor positioning. To reduce noise effects, it is often required to effectively filter the received spread spectrum signals. However, current filtering methods in the time or frequency domain can only filter high frequency band noise, making the measurement accuracy low. In this paper, a low frequency band noise reduction algorithm based on the threshold segmentation of the rectangular window is proposed. The method is based on thresholding on time-frequency wavelet domain by variance analysis and signal despreading is achieved by wavelet autocorrelation at low frequency band after denoising with reference to locally generated spread spectrum signal without added noise at the same subband. Simulation results show that compared with other filtering methods, the proposed method by wavelet autocorrelation and denoising can eliminate the noise effects at the receiver, leading to improving the positioning accuracy significantly.

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Section: System Modelmentioning

confidence: 99%

Wavelet Autocorrelation and Denoising of Spread Spectrum Signal for Narrowband Wireless Indoor Positioning

Wenyang¹,

Luo²

2017

dtetr

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“…To combat the effect of ISI, RAKE is followed by an equalizer. In [1], [2] combined RAKE and equalization methods were proposed for DS-UWB systems. The problem is further aggravated in multiuser communications where the desired information is embedded with MUI.…”

Section: Introductionmentioning

confidence: 99%

“…The symbol response for u th user data transmitted on antenna n and received on receiver antenna m is given by (2) [ , .…”

Section: Introductionmentioning

confidence: 99%

Multiuser detection based receivers for diversity enhancing UWB systems

Shamaiah

Srikanth

Viswanath

2011

2011 IEEE International Conference on Ultra-Wideband (ICUWB)

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Ultra-wideband (UWB) transmissions have well-documented advantages for low-power, peer-to-peer, and multiple-access communications. In this paper, we present novel linear receiver algorithms for multiuser detection (MUD) based on minimum mean square error (MMSE) for diversity enhancing UWB multiuser communication systems. The algorithms exploit inherent multipath diversity and mitigate the effects of both inter symbol interference (ISI) and multiuser interference (MUI). Further more, the receiver algorithms also optimally exploit diversity. We also propose a coded transmission scheme for the MIMO-UWB system for exploiting transmit diversity. We provide performance evaluation of the detectors through detailed analysis and simulations for synchronous and asynchronous users. An analytical framework for obtaining closed form expression for the bit error rate (BER) of the above schemes is also discussed.

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“…Compared to tracking in traditional DS scenarios, tracking in UWB communications is much more challenging, because the difficulty of timing error estimation is accentuated due to dense multipath environment and low power consumption. In addition, since coherent RAKE together with equalization technique is generally employed in high rate DS-UWB receivers [3] [4], timing is required to be more accurate than low rate IR-UWB communications, where non-coherent receivers are generally used.…”

Section: Introductionmentioning

confidence: 99%

Periodical-Pilot-Assisted Tracking Loop with RAKE Combining for High Rate DS-UWB Receivers

Jin

Xiao

Zhang

et al. 2010

2010 IEEE International Conference on Communications

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Tracking constitutes a major challenge in UltraWideband (UWB) communications due to dense multipath environment and low power consumption. Most of the existing studies on tracking fall within low rate Impulse Radio UWB (IR-UWB) scope, with the assumption that Inter-Frame Interference (IFI) or Inter-Symbol Interference (ISI) is absent. In this paper, we settle on high rate Direct-Sequence UWB (DS-UWB) systems, in which ISI is inevitable. A Periodical-Pilot-Assisted Tracking Loop with RAKE combining, which we termed PPATL, is proposed for high rate DS-UWB scenario. The proposed tracking loop can effectively combat ISI and capture multipath energy. Analytical expressions of Probability Density Function (PDF) of timing error in locked state, Mean Square Error (MSE, or termed timing jitter) and Mean Time to Lose Lock (MTLL) are derived. Numerical results are presented and then confirmed by means of extensive computer simulation results. These results corroborate our theoretical analysis. Additionally, this proposed PPATL has been used and justified in our realistic DS-UWB system.

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Equalization for DS-UWB Systems—Part I: BPSK Modulation

Cited by 43 publications

References 28 publications

Wavelet Autocorrelation and Denoising of Spread Spectrum Signal for Narrowband Wireless Indoor Positioning

Wavelet Autocorrelation and Denoising of Spread Spectrum Signal for Narrowband Wireless Indoor Positioning

Multiuser detection based receivers for diversity enhancing UWB systems

Periodical-Pilot-Assisted Tracking Loop with RAKE Combining for High Rate DS-UWB Receivers

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