Fair resource allocation and DF relay selection for multiuser OFDMA-based cooperative networks

Alazemi, Hamed M. K.; Uddin, Mohammad Faisal

doi:10.1007/s11276-013-0546-4

Cited by 5 publications

(7 citation statements)

References 27 publications

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“…The total transmission power is equally shared among all subchannels. We assume that all required channel gains among BS and all UEs, and among UEs and user-relays are available perfectly at the BS where RA algorithms are performed as in user-relay assisted OFDMA systems [32][33][34][35][36][37][38] as well as fixed-relay assisted OFDMA systems [19][20][21][22][23][24][25][26][27][28][29]. The communication links between BS and userrelays and user-relays and UEs use the same subchannel at different time slots as in [32,37,38].…”

Section: System Modelmentioning

confidence: 99%

“…The problem formulation may differ significantly in optimization objectives (rate maximization, power minimization), optimization constraints (fairness, load balancing), relaying protocols (amplify and forward (AF), decode and forward (DF)), relaying modes (full-duplex, half-duplex), relay types (fixed, mobile), antenna numbers of the source, destination and relay (single antenna/multiple antennas) and system architectures (downlink/uplink, single-cell/multi-cell). The RRM problem has been examined in numerous research works for OFDMA-based fixed relay networks [19][20][21][22][23][24][25][26][27][28][29]. The opportunities and challenges of the OFDMA-based fixed relay networks have been discussed in detail in [19,20].…”

Section: Introductionmentioning

confidence: 99%

“…The fairness issue has been considered in [23][24][25] contrary to given studies earlier and heuristic RRM algorithms have been presented. In [26,27], the joint relay selection and RA problem have been investigated for the uplink single-cell OFDMA-based system. In [28,29], the RRM problem has been adapted for the multi-cell scenario.…”

Section: Introductionmentioning

confidence: 99%

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Radio resource management for user-relay assisted OFDMA-based wireless networks

Baştürk

Özbek

2016

AEU - International Journal of Electronics and Communications

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a b s t r a c tOrthogonal frequency division multiple access (OFDMA) based relay assisted networks are important for current and next-generation wireless networks since they have great potential to provide high data rate to users at anywhere, anytime. Towards that end, fixed relay assisted OFDMA networks are commonly utilized by the operators. However, they require supplementary costly infrastructure. User-relay assisted OFDMA-based networks are promising candidates to fulfill the demanding coverage and capacity requirements of future wireless networks in a cost efficient way. Thus, they have become popular as a complementary solution to fixed relay networks. Generic frame structure that divides the resource allocation frame into two subframes is mostly used in the literature for fixed and user-relay assisted networks in which it is assumed that a user can act as a destination and a relay simultaneously. However, it may be difficult to apply this assumption to practical systems because of the limitations of the current transceiver design. Thus, we propose a novel frame structure for user-relay assisted OFDMA-based wireless networks in order to cope with these drawbacks. The efficient radio resource management algorithms including relay selection and resource allocation are developed in order to exploit the opportunities of the proposed frame structure.

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Section: System Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Radio resource management for user-relay assisted OFDMA-based wireless networks

Baştürk

Özbek

2016

AEU - International Journal of Electronics and Communications

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“…The use of cooperative diversity in multiple‐access systems is a promising solution for combating fading impairments and creating virtual antenna array by using other mobile user's antennas [1–3]. For this purpose, several studies in the literature have focused on the performance of multiple‐access systems by using the cooperative diversity such as cooperative code‐division multiple‐access (CDMA) networks and orthogonal frequency DMA (OFDMA) networks [4–9]. A multi‐user detection approach for an uplink multi‐user cooperative diversity communication system using direct‐sequence CDMA (DS‐CDMA) relaying was proposed and joint estimation of spatial signatures, channel gains and transmitted symbols of all users for cooperative DS‐CDMA system was presented [4].…”

Section: Introductionmentioning

confidence: 99%

“…Along the same lines, Kapucu et al [8] studied the bit‐error rate (BER) analysis of cooperative DS‐CDMA systems over Weibull/Rayleigh asymmetric fading channels. Against the cooperative DS‐CDMA background in [9], the joint problem of power and subcarrier allocation with relay selection for multi‐user multi‐relay OFDMA systems was addressed and they formulated the optimal problem using Boolean‐convex optimisation with the objective of improving the average network capacity for the considered system.…”

Section: Introductionmentioning

confidence: 99%

Cooperative IDMA systems with regenerative relays over Weibull fading channels: outage probability and error analysis

2017

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Channel and queue aware joint relay selection and resource allocation for MISO-OFDMA based user-relay assisted cellular networks

Baştürk

Özbek

2017

Telecommun Syst

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User-relay assisted orthogonal frequency division multiple access (OFDMA) networks are cost-effective solutions to meet the growing capacity and coverage demands of the next generation cellular networks. These networks can be used with multiple antennas technology in order to obtain a diversity gain to combat signal fading and to obtain more capacity gain without increasing the bandwidth or transmit power. Efficient relay selection and resource allocation are crucial in such a multi-user, multi-relay and multi-antenna environment to fully exploit the benefits of the combination of user-relaying and multiple antennas technology. Thus, we propose a channel and queue aware joint relay selection and resource allocation algorithm for multiple-input singleoutput (MISO)-OFDMA based user-relay assisted downlink cellular networks. Since, the proposed algorithm is not only channel but also queue-aware, the system resources are allocated efficiently among the users. The proposed algorithm for the MISO-OFDMA based user-relay assisted scheme is compared to existing MISO-OFDMA based non-relaying and fixed relay assisted schemes and it is also compared with the existing single-input single-output (SISO)-OFDMA based user-relay assisted scheme. Simulation results revealed that the proposed scheme outperforms the existing schemes in terms of cell-edge users' total data rate, average backlog and average delay.

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Fair resource allocation and DF relay selection for multiuser OFDMA-based cooperative networks

Cited by 5 publications

References 27 publications

Radio resource management for user-relay assisted OFDMA-based wireless networks

Radio resource management for user-relay assisted OFDMA-based wireless networks

Cooperative IDMA systems with regenerative relays over Weibull fading channels: outage probability and error analysis

Channel and queue aware joint relay selection and resource allocation for MISO-OFDMA based user-relay assisted cellular networks

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