Performance of coherent UWB Rake receivers with channel estimators

Mielczarek, B.; Wessman, Matts-Ola; Svensson, Arne

doi:10.1109/vetecf.2003.1285351

Cited by 100 publications

(62 citation statements)

References 7 publications

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“…Notice that all these MUD algorithms introduced above can be applied to the multipath situation easily by Rake receivers with channel estimators [33] (which is outside the scope of this article).…”

Section: Sic Detectormentioning

confidence: 99%

“…However, the multipath channel is in reality used more often, especially in the indoor environment. In this article, IEEE 802.15.3a channel model discussed in [30,32,33] is chosen for the system in discussion. This channel model is slightly modified from the Saleh-Valenzuela model [34], that is, a lognormal distribution hypothesis for the multipath gain magnitude replaces the Rayleigh distribution hypothesis.…”

Section: Introductionmentioning

confidence: 99%

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A complexity-performance-balanced multiuser detector based on artificial fish swarm algorithm for DS-UWB systems in the AWGN and multipath environments

Yin

Zong

Sun

et al. 2012

EURASIP J. Adv. Signal Process.

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In this article, an efficient multiuser detector based on the artificial fish swarm algorithm (AFSA-MUD) is proposed and investigated for direct-sequence ultrawideband systems under different channels: the additive white Gaussian noise channel and the IEEE 802.15.3a multipath channel. From the literature review, the issues that the computational complexity of classical optimum multiuser detection (OMD) rises exponentially with the number of users and the bit error rate (BER) performance of other sub-optimal multiuser detectors is not satisfactory, still need to be solved. This proposed method can make a good tradeoff between complexity and performance through the various behaviors of artificial fishes in the simplified Euclidean solution space, which is constructed by the solutions of some sub-optimal multiuser detectors. Here, these sub-optimal detectors are minimum mean square error detector, decorrelating detector, and successive interference cancellation detector. As a result of this novel scheme, the convergence speed of AFSA-MUD is greatly accelerated and the number of iterations is also significantly reduced. The experimental results demonstrate that the BER performance and the near-far effect resistance of this proposed algorithm are quite close to those of OMD, while its computational complexity is much lower than the traditional OMD. Moreover, as the number of active users increases, the BER performance of AFSA-MUD is almost the same as that of OMD.

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Section: Sic Detectormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A complexity-performance-balanced multiuser detector based on artificial fish swarm algorithm for DS-UWB systems in the AWGN and multipath environments

Yin

Zong

Sun

et al. 2012

EURASIP J. Adv. Signal Process.

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“…A coherent receiver needs to estimate the channel parameters α p,q , T p , τ p,q , for instance by applying the matched filter technique along with a FS-rake receiver and exploiting data aided (DA) channel estimation [13]. Each estimation of the signal h(t) is denoted by h(t) and expressed as…”

Section: B Single Link Configurationmentioning

confidence: 99%

“…For CR, analysis undertaken in [13] points out the FSrake receiver as a good compromise between performance and complexity. It provides acceptable performance, close to ML one, for much lower complexity.…”

Section: A Simulation Parametersmentioning

confidence: 99%

Design and performance analysis of a space-time block coding scheme for single band UWB

Héliot¹,

Ghavami²,

Nakhai³

2006

IEE Proc., Commun.

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Abstract-Ultra wide-band (UWB) systems have recently attracted much research interest owing to their appealing features in short-range mobile communications. These features include high data rates, low power consumption, multiple access communications, and precise positioning capabilities. Space-time coding techniques, such as the block coding scheme or the trellis coding scheme, are known to be simple and practical ways to increase both the spectral efficiency and the capacity in wireless communications. So far, few contributions have looked over multiple inputs multiple outputs UWB systems. In this paper, a method to adapt the space-time block coding technique to single band UWB signalling is proposed. A space-time block codec, based on orthogonal pulses to achieve spatial diversity and collect the multipath diversity is developed. A theoretical analysis is conducted to enlighten the performance enhancements provided by the proposed scheme compared to the classic single link scheme. Simulations support analysis, for various numbers of transmit and receive antennas, several types of channel scenarios, and different detection techniques. In a typical studied UWB environment, the results revealed that our proposed scheme improves the bit error rate performances compared to those of a single link scheme and it provides a strong immunity against timing jitter.

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“…A commonly used model for UWB channels is a block fading channel model [4], where the channel is assumed stationary within a specific block (e.g. for P Q v h v microseconds [5]), and different channel realizations are considered for different blocks. Therefore, the radio channel characteristics vary in the long-term, and they may be assumed stationary in the short-term.…”

Section: Introductionmentioning

confidence: 99%

Joint Parameter Estimation for UWB Energy Detectors Using OOK

Sahin

Güvenç

Arslan

2006

Wireless Pers Commun

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In this paper, joint estimation of the optimal threshold, synchronization point, and integration interval is developed for ultrawideband (UWB) energy detectors employing on-off keying (OOK) modulation. Gaussian approximation of the received signal statistics is shown to enable low complexity solutions at the expense of some performance degradation. The performances of the optimal and suboptimal solutions are evaluated and compared. It is shown that explicit BER minimization is required for parameter optimization. Using simulations, number of training symbols required to converge to ideal parameter estimates is demonstrated to be increasing with increasing SNR.

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Performance of coherent UWB Rake receivers with channel estimators

Cited by 100 publications

References 7 publications

A complexity-performance-balanced multiuser detector based on artificial fish swarm algorithm for DS-UWB systems in the AWGN and multipath environments

A complexity-performance-balanced multiuser detector based on artificial fish swarm algorithm for DS-UWB systems in the AWGN and multipath environments

Design and performance analysis of a space-time block coding scheme for single band UWB

Joint Parameter Estimation for UWB Energy Detectors Using OOK

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