Pub Date : 2015-08-28DOI: 10.1109/ISWCS.2015.7454401
J. Zhong, Gaojie Chen, P. Xiao
This paper presents a novel iterative frequency domain equalization (FDE) algorithm for uplink Single Carrier (SC) Frequency Division Multiple Access (FDMA) multiuser MIMO systems. The proposed FDE scheme improves the system performance by taking into consideration the complete second order statistics of the received signal in frequency domain. Our analytical model is in line with 3GPP uplink SC-FDMA transmission with Multi-user (MU) Spatial Division Multiplexing (SDM). The results show that the proposed MU-MIMO with the new FDE significantly improves the bit error rate (BER) performance in comparison with the conventional scheme for the system under consideration.
{"title":"Iterative widely linear equalization for MIMO SC-FDMA systems","authors":"J. Zhong, Gaojie Chen, P. Xiao","doi":"10.1109/ISWCS.2015.7454401","DOIUrl":"https://doi.org/10.1109/ISWCS.2015.7454401","url":null,"abstract":"This paper presents a novel iterative frequency domain equalization (FDE) algorithm for uplink Single Carrier (SC) Frequency Division Multiple Access (FDMA) multiuser MIMO systems. The proposed FDE scheme improves the system performance by taking into consideration the complete second order statistics of the received signal in frequency domain. Our analytical model is in line with 3GPP uplink SC-FDMA transmission with Multi-user (MU) Spatial Division Multiplexing (SDM). The results show that the proposed MU-MIMO with the new FDE significantly improves the bit error rate (BER) performance in comparison with the conventional scheme for the system under consideration.","PeriodicalId":383105,"journal":{"name":"2015 International Symposium on Wireless Communication Systems (ISWCS)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133536072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-08-28DOI: 10.1109/ISWCS.2015.7454410
Mohammed Al-Imari, M. Ghoraishi, P. Xiao
Full-duplex technology has the potential to double the wireless system spectral efficiency by enabling simultaneous transmission and reception at the same time on the same frequency. In this paper, we address the subcarrier and power allocation problem for full-duplex system. The problem is coupled between uplink and downlink channels due to the self-interference and inter-user interference. As the problem is non-convex, a suboptimal algorithm is proposed based on the Frank-Wolfe approach. To this end, a subcarrier and power allocation is first performed for the downlink channel, and then the uplink resource allocation is represented as a D.C. (difference of two convex functions) problem. An approximation is used to convert the D.C. problem into two convex sub-problems, which are solved iteratively to produce a lower bound approximation for the non-convex objective. Simulation results show that the algorithm achieves fast convergence regardless of different initialization points, and can significantly improve the full-duplex performance comparing to the equal resource allocation approach. Furthermore, the full-duplex system with the proposed algorithm can achieve significant gains in spectral efficiency, that reach up to 48%, comparing to half-duplex system.
{"title":"Radio resource allocation for full-duplex multicarrier wireless systems","authors":"Mohammed Al-Imari, M. Ghoraishi, P. Xiao","doi":"10.1109/ISWCS.2015.7454410","DOIUrl":"https://doi.org/10.1109/ISWCS.2015.7454410","url":null,"abstract":"Full-duplex technology has the potential to double the wireless system spectral efficiency by enabling simultaneous transmission and reception at the same time on the same frequency. In this paper, we address the subcarrier and power allocation problem for full-duplex system. The problem is coupled between uplink and downlink channels due to the self-interference and inter-user interference. As the problem is non-convex, a suboptimal algorithm is proposed based on the Frank-Wolfe approach. To this end, a subcarrier and power allocation is first performed for the downlink channel, and then the uplink resource allocation is represented as a D.C. (difference of two convex functions) problem. An approximation is used to convert the D.C. problem into two convex sub-problems, which are solved iteratively to produce a lower bound approximation for the non-convex objective. Simulation results show that the algorithm achieves fast convergence regardless of different initialization points, and can significantly improve the full-duplex performance comparing to the equal resource allocation approach. Furthermore, the full-duplex system with the proposed algorithm can achieve significant gains in spectral efficiency, that reach up to 48%, comparing to half-duplex system.","PeriodicalId":383105,"journal":{"name":"2015 International Symposium on Wireless Communication Systems (ISWCS)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126761487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-08-28DOI: 10.1109/ISWCS.2015.7454317
Mohammed Al-Imari, P. Xiao, M. Imran
Non-Orthogonal Multiple Access (NOMA) is a promising multiple access technique for 5G wireless networks. In uplink NOMA, more than one user can use the same subcarrier, which increases the system throughput and fairness. Due to the non-orthogonality among the users, joint processing is required at the receiver to retrieve the users' signals. In this paper, we propose solutions to optimize the receiver and the radio resource allocation of uplink NOMA. First, we propose an iterative multiuser detection and decoding (MUDD) to improve the performance of the multiuser detector by utilizing the information derived by the channel decoder. In addition, a novel subcarrier and power allocation algorithm is proposed for NOMA scheme that maximizes the users' weighted sum-rate. The link-level performance evaluation has shown that the proposed iterative MUDD approach brings about 4.5 dB and 9.8 dB performance improvements at block error rate equal to 10-2 comparing to conventional multiuser detection, for QPSK and 16QAM modulations, respectively. Furthermore, the system-level results show that the proposed resource allocation algorithm achieves the system spectral efficiency upper-bound, making NOMA significantly outperforms OFDMA in terms of spectral efficiency and fairness.
{"title":"Receiver and resource allocation optimization for uplink NOMA in 5G wireless networks","authors":"Mohammed Al-Imari, P. Xiao, M. Imran","doi":"10.1109/ISWCS.2015.7454317","DOIUrl":"https://doi.org/10.1109/ISWCS.2015.7454317","url":null,"abstract":"Non-Orthogonal Multiple Access (NOMA) is a promising multiple access technique for 5G wireless networks. In uplink NOMA, more than one user can use the same subcarrier, which increases the system throughput and fairness. Due to the non-orthogonality among the users, joint processing is required at the receiver to retrieve the users' signals. In this paper, we propose solutions to optimize the receiver and the radio resource allocation of uplink NOMA. First, we propose an iterative multiuser detection and decoding (MUDD) to improve the performance of the multiuser detector by utilizing the information derived by the channel decoder. In addition, a novel subcarrier and power allocation algorithm is proposed for NOMA scheme that maximizes the users' weighted sum-rate. The link-level performance evaluation has shown that the proposed iterative MUDD approach brings about 4.5 dB and 9.8 dB performance improvements at block error rate equal to 10-2 comparing to conventional multiuser detection, for QPSK and 16QAM modulations, respectively. Furthermore, the system-level results show that the proposed resource allocation algorithm achieves the system spectral efficiency upper-bound, making NOMA significantly outperforms OFDMA in terms of spectral efficiency and fairness.","PeriodicalId":383105,"journal":{"name":"2015 International Symposium on Wireless Communication Systems (ISWCS)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114345031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-08-28DOI: 10.1109/ISWCS.2015.7454319
Gaojie Chen, Dandan Liang, M. Ghoraishi, P. Xiao, R. Tafazolli
This paper studies the optimum user selection scheme in a hybrid-duplex device-to-device (D2D) cellular networks. We derive an analytical integral-form expression of the cumulative distribution function (CDF) for the received signal-to-noise-plus-interference-ratio (SINK) at the D2D node, based on which the closed-form of the outage probability is obtained. Analysis shows that the proposed user selection scheme achieves the best SINK at the D2D node with interference to base station being limited by a pre-defined level. Hybrid duplex D2D can be switched between half and full duplex according to different residual self-interference to enhance the throughput of D2D pair. Simulation results are presented to validate the analysis.
{"title":"Optimum user selection for hybrid-duplex device-to-device in cellular networks","authors":"Gaojie Chen, Dandan Liang, M. Ghoraishi, P. Xiao, R. Tafazolli","doi":"10.1109/ISWCS.2015.7454319","DOIUrl":"https://doi.org/10.1109/ISWCS.2015.7454319","url":null,"abstract":"This paper studies the optimum user selection scheme in a hybrid-duplex device-to-device (D2D) cellular networks. We derive an analytical integral-form expression of the cumulative distribution function (CDF) for the received signal-to-noise-plus-interference-ratio (SINK) at the D2D node, based on which the closed-form of the outage probability is obtained. Analysis shows that the proposed user selection scheme achieves the best SINK at the D2D node with interference to base station being limited by a pre-defined level. Hybrid duplex D2D can be switched between half and full duplex according to different residual self-interference to enhance the throughput of D2D pair. Simulation results are presented to validate the analysis.","PeriodicalId":383105,"journal":{"name":"2015 International Symposium on Wireless Communication Systems (ISWCS)","volume":"280 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132939269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-08-26DOI: 10.1109/ISWCS.2015.7454351
Wenjun Fu, J. Thompson
In this paper, the K-best detection algorithm with an adaptive modulation scheme in multiple input multiple output (MIMO) systems is proposed. A simplified error probability approximation method based on the union bound (UB) of the Maximum-Likelihood detector (MLD) is proposed to predict the bit error rate (BER) of the K-best algorithm. In specific, the simplified approach only uses the minimum Euclidean distance (MED) events which is suitable for the adaptive modulation scheme with much reduced computational complexity. In order to improve the accuracy of prediction, the signal-to-noise ratio (SNR) gaps between the UB with MED events and the full UB are estimated. Finally, simulation results have clearly shown the adaptive K-best algorithm applying the simplified approximation method has much reduced computational complexities while maintaining a promising BER performance.
{"title":"Performance analysis of K-best detection with adaptive modulation","authors":"Wenjun Fu, J. Thompson","doi":"10.1109/ISWCS.2015.7454351","DOIUrl":"https://doi.org/10.1109/ISWCS.2015.7454351","url":null,"abstract":"In this paper, the K-best detection algorithm with an adaptive modulation scheme in multiple input multiple output (MIMO) systems is proposed. A simplified error probability approximation method based on the union bound (UB) of the Maximum-Likelihood detector (MLD) is proposed to predict the bit error rate (BER) of the K-best algorithm. In specific, the simplified approach only uses the minimum Euclidean distance (MED) events which is suitable for the adaptive modulation scheme with much reduced computational complexity. In order to improve the accuracy of prediction, the signal-to-noise ratio (SNR) gaps between the UB with MED events and the full UB are estimated. Finally, simulation results have clearly shown the adaptive K-best algorithm applying the simplified approximation method has much reduced computational complexities while maintaining a promising BER performance.","PeriodicalId":383105,"journal":{"name":"2015 International Symposium on Wireless Communication Systems (ISWCS)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124792168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-08-25DOI: 10.1109/ISWCS.2015.7454316
Pape-Abdoulaye Fam, M. Crussiére, J. Hélard, P. Bretillon, S. Paquelet
An exponential growth of the mobile data traffic is expected in future networks. The reason of this growth is related to the increasing popularity of linear services such as mobile TV, live and sports events, which may lead to the delivery of the same contents to a large audience. Recent studies have shown that network cooperation is a promising candidate to deal with such an issue. This paper investigates, from a planning perspective, the optimization of a hybrid unicast/broadcast network for linear services. We introduce an analytical approach with the aim of stating an optimization problem on the hybrid network configuration, namely in terms of the sharing between the unicast and broadcast modes to deliver a particular service. We show by simulation the existence of an optimal operation point which leads to the maximization of the overall throughput of the hybrid network under the constraint of a minimum service success rate.
{"title":"Global throughput maximization of a hybrid unicast-broadcast network for linear services","authors":"Pape-Abdoulaye Fam, M. Crussiére, J. Hélard, P. Bretillon, S. Paquelet","doi":"10.1109/ISWCS.2015.7454316","DOIUrl":"https://doi.org/10.1109/ISWCS.2015.7454316","url":null,"abstract":"An exponential growth of the mobile data traffic is expected in future networks. The reason of this growth is related to the increasing popularity of linear services such as mobile TV, live and sports events, which may lead to the delivery of the same contents to a large audience. Recent studies have shown that network cooperation is a promising candidate to deal with such an issue. This paper investigates, from a planning perspective, the optimization of a hybrid unicast/broadcast network for linear services. We introduce an analytical approach with the aim of stating an optimization problem on the hybrid network configuration, namely in terms of the sharing between the unicast and broadcast modes to deliver a particular service. We show by simulation the existence of an optimal operation point which leads to the maximization of the overall throughput of the hybrid network under the constraint of a minimum service success rate.","PeriodicalId":383105,"journal":{"name":"2015 International Symposium on Wireless Communication Systems (ISWCS)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123418729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-08-25DOI: 10.1109/ISWCS.2015.7454452
A. Cheaito, J. Hélard, M. Crussiére, Y. Louët
In this paper, we analyse the impact of clipping used as a peak-to-average power ratio reduction technique for multicarrier signals, assuming that a linearization stage is implemented before the power amplifier. Therefore, the expression of the Error Vector Magnitude (EVM) of the output signal is analytically derived. We mainly focus on the effect of clipping in both cases with and without the use of the predistortion stage. We provide analytical expressions of the EVM in the form of a series expansion that depends on the clipping threshold, the transition factors of the power amplifier, the predistortion characteristics and the PAPR of the input signal. We show through simulations that the proposed expressions present very good accuracy, even when limiting the series expansion to an order of 4. Finally, a simple scenario is proposed to demonstrate the benefit of our EVM expressions in controlling the average transmitted power with the aim to guarantee a high quality of service.
{"title":"Impact of clipping on EVM of the predistorted non-linear amplified multicarrier signals","authors":"A. Cheaito, J. Hélard, M. Crussiére, Y. Louët","doi":"10.1109/ISWCS.2015.7454452","DOIUrl":"https://doi.org/10.1109/ISWCS.2015.7454452","url":null,"abstract":"In this paper, we analyse the impact of clipping used as a peak-to-average power ratio reduction technique for multicarrier signals, assuming that a linearization stage is implemented before the power amplifier. Therefore, the expression of the Error Vector Magnitude (EVM) of the output signal is analytically derived. We mainly focus on the effect of clipping in both cases with and without the use of the predistortion stage. We provide analytical expressions of the EVM in the form of a series expansion that depends on the clipping threshold, the transition factors of the power amplifier, the predistortion characteristics and the PAPR of the input signal. We show through simulations that the proposed expressions present very good accuracy, even when limiting the series expansion to an order of 4. Finally, a simple scenario is proposed to demonstrate the benefit of our EVM expressions in controlling the average transmitted power with the aim to guarantee a high quality of service.","PeriodicalId":383105,"journal":{"name":"2015 International Symposium on Wireless Communication Systems (ISWCS)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127002649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-08-25DOI: 10.1109/ISWCS.2015.7454395
A. Nafkha, Malek Naoues, Krzysztof Cichon, Adrian Kliks, Babar Aziz
The dynamic spectrum access is a concept opposite to static frequency spectrum assignment and one of the key elements of cognitive radio (CR). It allows secondary users to access unused licensed frequency bands. In order to detect the presence of primary users, one of the fundamental tasks that a CR equipment has to perform is spectrum sensing process. In this paper, a hybrid spectrum sensing architecture is proposed, which consists of the concatenation of a sequential energy detection (SED) and a cyclostationary-based (CB) detector. The former sensing method is performed to reduce spectrum sensing time, when the SNR is very high (resp. very low), while the latter sensing detector is performed whenever the SED does not guarantee the required quality of detection (i.e. moderate SNR regime). The efficiency of the proposed solution has been verified experimentally using USRP N210 boards under GNURadio environment.
{"title":"Hybrid spectrum sensing experimental analysis using GNU radio and USRP for cognitive radio","authors":"A. Nafkha, Malek Naoues, Krzysztof Cichon, Adrian Kliks, Babar Aziz","doi":"10.1109/ISWCS.2015.7454395","DOIUrl":"https://doi.org/10.1109/ISWCS.2015.7454395","url":null,"abstract":"The dynamic spectrum access is a concept opposite to static frequency spectrum assignment and one of the key elements of cognitive radio (CR). It allows secondary users to access unused licensed frequency bands. In order to detect the presence of primary users, one of the fundamental tasks that a CR equipment has to perform is spectrum sensing process. In this paper, a hybrid spectrum sensing architecture is proposed, which consists of the concatenation of a sequential energy detection (SED) and a cyclostationary-based (CB) detector. The former sensing method is performed to reduce spectrum sensing time, when the SNR is very high (resp. very low), while the latter sensing detector is performed whenever the SED does not guarantee the required quality of detection (i.e. moderate SNR regime). The efficiency of the proposed solution has been verified experimentally using USRP N210 boards under GNURadio environment.","PeriodicalId":383105,"journal":{"name":"2015 International Symposium on Wireless Communication Systems (ISWCS)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131479868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-08-25DOI: 10.1109/ISWCS.2015.7454402
Rémi Chauvat, P. Chevalier, J. Delmas
Widely linear (WL) receivers are able to fulfill single antenna interference cancellation (SAIC) of one rectilinear (R) (ASK, BPSK) or quasi-rectilinear (QR) (MSK, GMSK, OQAM) co-channel interference (CCI), a function which is operational in GSM handsets in particular. However, in most cases, SAIC technology loses its efficiency if the residual frequency offset (FO) of the CCI is above a very small fraction of the baud rate. It may be the case for airborne communications, due to high differential Doppler shifts. It may also be the case if we try to use SAIC or multiple antenna interference cancellation (MAIC) receivers to mitigate intrinsic inter-carrier interference (ICI) of filter-bank multicarrier waveforms coupled with OQAM constellations (FBMC-OQAM), which are candidate for 5G networks, and for which the ICI FO is equal to 50% of the (real) baud rate. In this context, the purpose of this paper is twofold. The first one is to extend, for an arbitrary propagation channel and from a maximum likelihood sequence estimation (MLSE)-based approach, the SAIC/MAIC concept to R or QR signals with differential FO using WL frequency-shifted (FRESH) filtering. The second one is to analyse both analytically and by simulations the impact of the residual CCI FO on the performance of the proposed SAIC/MAIC receiver.
宽线性（WL）接收器能够实现单天线干扰消除（SAIC），消除一个整线（R）（ASK、BPSK）或准整线（QR）（MSK、GMSK、OQAM）共信道干扰（CCI），这一功能尤其适用于 GSM 手机。然而，在大多数情况下，如果 CCI 的残余频率偏移（FO）超过波特率的很小一部分，SAIC 技术就会失去效率。机载通信可能就是这种情况，因为差分多普勒频移较高。如果我们尝试使用 SAIC 或多天线干扰消除（MAIC）接收器来减轻与 OQAM 星群（FBMC-OQAM）耦合的滤波器组多载波波形的固有载波间干扰（ICI），也可能会出现这种情况。在这种情况下，本文有两个目的。首先是针对任意传播信道，从基于最大似然序列估计（MLSE）的方法出发，利用 WL 频移（FRESH）滤波将 SAIC/MAIC 概念扩展到具有差分 FO 的 R 或 QR 信号。其次是分析和模拟残余 CCI FO 对拟议 SAIC/MAIC 接收器性能的影响。
{"title":"Widely linear FRESH receiver for SAIC/MAIC with frequency offsets","authors":"Rémi Chauvat, P. Chevalier, J. Delmas","doi":"10.1109/ISWCS.2015.7454402","DOIUrl":"https://doi.org/10.1109/ISWCS.2015.7454402","url":null,"abstract":"Widely linear (WL) receivers are able to fulfill single antenna interference cancellation (SAIC) of one rectilinear (R) (ASK, BPSK) or quasi-rectilinear (QR) (MSK, GMSK, OQAM) co-channel interference (CCI), a function which is operational in GSM handsets in particular. However, in most cases, SAIC technology loses its efficiency if the residual frequency offset (FO) of the CCI is above a very small fraction of the baud rate. It may be the case for airborne communications, due to high differential Doppler shifts. It may also be the case if we try to use SAIC or multiple antenna interference cancellation (MAIC) receivers to mitigate intrinsic inter-carrier interference (ICI) of filter-bank multicarrier waveforms coupled with OQAM constellations (FBMC-OQAM), which are candidate for 5G networks, and for which the ICI FO is equal to 50% of the (real) baud rate. In this context, the purpose of this paper is twofold. The first one is to extend, for an arbitrary propagation channel and from a maximum likelihood sequence estimation (MLSE)-based approach, the SAIC/MAIC concept to R or QR signals with differential FO using WL frequency-shifted (FRESH) filtering. The second one is to analyse both analytically and by simulations the impact of the residual CCI FO on the performance of the proposed SAIC/MAIC receiver.","PeriodicalId":383105,"journal":{"name":"2015 International Symposium on Wireless Communication Systems (ISWCS)","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127064685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-08-25DOI: 10.1109/ISWCS.2015.7454318
Quoc-Tuan Vien, T. Le, H. Nguyen, M. Karamanoğlu
This paper investigates downlink coverage maximisation in a heterogeneous wireless cellular network (HWCN) taking into account various indoor and outdoor propagation models. By using stochastic geometry modeling of multi-tier cells, the coverage probability of the practical HWCN is firstly derived characterising the impacts of cell density allocation, power allocation at cells, building infrastructures and transmission environment. It is interestingly observed that the increase of cell densities may not result in a higher coverage but causes a higher total power consumption. The coverage optimisation problem is therefore formulated aiming at maximising the coverage probability subject to the constraints on the power available in the HWCN. Specifically, an heuristic cell density allocation algorithm is proposed for the cell allocation at multiple tiers within various propagation models. The proposed scheme is shown to not only achieve a higher coverage region of up to 25% but also save 20% of power consumption when compared to the equal resource allocation mechanism.
{"title":"An energy-efficient resource allocation for optimal downlink coverage in heterogeneous wireless cellular networks","authors":"Quoc-Tuan Vien, T. Le, H. Nguyen, M. Karamanoğlu","doi":"10.1109/ISWCS.2015.7454318","DOIUrl":"https://doi.org/10.1109/ISWCS.2015.7454318","url":null,"abstract":"This paper investigates downlink coverage maximisation in a heterogeneous wireless cellular network (HWCN) taking into account various indoor and outdoor propagation models. By using stochastic geometry modeling of multi-tier cells, the coverage probability of the practical HWCN is firstly derived characterising the impacts of cell density allocation, power allocation at cells, building infrastructures and transmission environment. It is interestingly observed that the increase of cell densities may not result in a higher coverage but causes a higher total power consumption. The coverage optimisation problem is therefore formulated aiming at maximising the coverage probability subject to the constraints on the power available in the HWCN. Specifically, an heuristic cell density allocation algorithm is proposed for the cell allocation at multiple tiers within various propagation models. The proposed scheme is shown to not only achieve a higher coverage region of up to 25% but also save 20% of power consumption when compared to the equal resource allocation mechanism.","PeriodicalId":383105,"journal":{"name":"2015 International Symposium on Wireless Communication Systems (ISWCS)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128950120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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