A Novel Equalizer Structure for Direct Sequence Ultra Wideband (DS-UWB) System

Ren, Jin; Lim, Myoung-Seob

doi:10.1109/portable.2007.44

Cited by 2 publications

(4 citation statements)

References 6 publications

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“…L and M denote the number of clusters and its rays, respectively. In addition, the amplitude |α m,l | has a lognormal distribution while the phase ∠ α m,l is equal to {0, π} with equiprobability [30]. According to the conclusions in [32], there are four typical multipath channel models of different channel characteristics, namely CM1-CM4.…”

Section: Introductionmentioning

confidence: 95%

“…First, we consider a K-user synchronous DS-UWB system under the additive white Gaussian noise (AWGN) channel and each user employs the BPSK direct sequence spread spectrum modulation [30]. Then, the kth user's transmitted signal can be expressed in the following form [31]:…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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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“…A negative effect of incoherent summation is that the signal at the receiving point acts as an interference on itself, which raises the question of developing various methods for equalizing the channel response. Actually, equalization is also a kind of digital filtering [32][33][34][35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Filtering and Detection of Ultra-Wideband Chaotic Radio Pulses with a Matched Frequency-Selective Circuit

Kuzmin

Ефремова

2023

Electronics

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An approach is proposed to the filtering of an additive mixture of ultra-wideband chaotic signals and white Gaussian noise, in order to retrieve the useful signal in the receiver. The role of the filter is performed by a passive frequency-selective circuit, identical to the one involved in the formation of oscillations in the chaos generator. A mathematical model of a modulating chaos generator, detecting and receiving a sequence of ultra-wideband chaotic radio pulses in a noisy channel is designed. For the receiver of sequences of symbols encoded by chaotic radio pulses with 2- and 4-position modulation, the bit error ratio as a function of the noise level and the pulse duration is estimated numerically.

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A Novel Equalizer Structure for Direct Sequence Ultra Wideband (DS-UWB) System

Cited by 2 publications

References 6 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

Filtering and Detection of Ultra-Wideband Chaotic Radio Pulses with a Matched Frequency-Selective Circuit

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