Modeling of multiple access interference and BER derivation for TH and DS UWB multiple access systems

Niranjayan, S.; Nallanathan, Arumugam; Kannan, B.

doi:10.1109/twc.2006.04530

Cited by 25 publications

(17 citation statements)

References 24 publications

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“…It has been shown in [26] that this integral cannot be solved through analytical methods and numerical approach should be used. So in this work to achieve a semi-closed form, we use the GQR method to approximate E i (ω) with a good precision [19][20][21]. …”

Section: Cross-layer Interferencementioning

confidence: 99%

“…We derive a 'semi-closed-form' expression for the outage probability of an MUE, in the vicinity of some FAPs in a femtocell network employing the described TH technique. To compute the outage probability, we face some complicated integrals and employ the Gaussian quadrature rules (GQRs) for our analytical derivation [19][20][21]. The accuracy of this approach is confirmed by simulations.…”

Section: Introductionmentioning

confidence: 99%

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Downlink performance of two‐tier networks with time‐hopping modulation

Banitalebi¹,

Zeinalpour-Yazdi²

2015

IET Communications

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With growing demand for high data rates, the mobile network has faced excessive traffic and it seems that one of the few long-term solutions to this problem is employing femtocells which improve capacity and indoors coverage. In the typical femtocell networks, co-and cross-layer interferences caused by simultaneous transmission of macrocell base stations and femtocell access points in the same frequency band, results in dead spots especially if femtocells are densely employed. In this study, to mitigate the interference and improve the system's performance, the authors study the application of time-hopping approach. Particularly, the impact of aggressive signals of femto access points on a macro user equipment located in the second tier, that is, the femtocell coverage area, is analysed and the semi-closedform expression for the system outage probability is derived. Based on the analysis, they also simulate the transmission capacity (TC) that represents the total capacity of the co-channel two-tier networks with outage constraints. Next, employing Gaussian approximations, they derive upper and lower bounds on the outage probability. These bounds provide better insight on the effect of system's parameters on its performance. Their numerical results show that the time-hopping technique significantly reduces the outage probability and therefore increases the TC of two-tier networks.

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Section: Cross-layer Interferencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Downlink performance of two‐tier networks with time‐hopping modulation

Banitalebi¹,

Zeinalpour-Yazdi²

2015

IET Communications

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“…, and I pro is the total MAI caused by the K -1 interfering users, (14) Let τ k = a k T f + Δ k and Δ k = b k T p + g k , where a k is the discrete uniformly distributed r.v. in {0, 1, ..., N s -1}; b k is the discrete uniformly distributed r.v.…”

Section: ) Imentioning

confidence: 99%

“…For the conventional TH-UWB systems with binary PAM and/or PPM modulations in asynchronous MA scenarios, the performance analyses have been extensively investigated in [4,[8][9][10][11][12][13][14][15]. For the conventional TH-UWB systems with M-ary orthogonal PPM and N-ary biorthogonal PPM modulations, some relative studies have been reported in [16][17][18][19][20] and [2,21].…”

Section: Introductionmentioning

confidence: 99%

“…Hence, using GA leads to inaccurate error probability analysis and also leads to optimistically overestimate the system performance. By deriving the characteristic functions (CF) of the MAI, the accurate performance analyses of binary PPM/TH, M-ary orthogonal PPM/TH and N-ary BPPM/ TH/DS UWB systems were proposed in [3,[12][13][14]20]. In this article, the analytic CF expression of the MAI is derived and the performance analyses of the proposed TH/DS-UWB system is then obtained.…”

Section: Introductionmentioning

confidence: 99%

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A new time-hopping/direct-sequence biorthogonal PPM UWB communication system

Shen

Ueng

Jeng

2011

J Wireless Com Network

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In order to increase the capacity and diminish the multiple access interference (MAI) of an ultra-wideband (UWB) system, we propose a new time-hopping/direct-sequence (TH/DS) scheme using N-ary biorthogonal pulse position modulation (BPPM). In contrast with the conventional TH/DS systems employing fixed partition of the TH slots (Shen and Ueng, Proceedings of the IEEE VTC-Spring, 2010), the proposed TH/DS system can put the start location of the TH slot in any one of Q available pulse positions within the frame. In the proposed TH/DS system, the modulation level of BPPM can be increased and the multiple access capability can be improved without degrading the system performance. Compared with the existing TH-UWB system that employs the whole frame to carry out TH process (Shen et al. IEEE Trans. Veh. Technol. 59(2), 742-753, 2010), the proposed system has the merits of smooth power spectral density and low receiver complexity. In this article, we also derive the probability distribution of MAI for each correlator's output of the proposed TH/DS system based on the analytic characteristic function technique. In order to verify the correctness of the performance analyses and to demonstrate the effectiveness of the proposed TH/DS system, some simulation results are given in both the additive white Gaussian noise channel and the realistic UWB fading channels. From the simulation results, we find that the proposed TH/DS system outperforms the conventional TH/DS scheme.

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