Power Allocation Schemes

Cooperative communication provides most of the advantages as multi-antenna systems due to availability of independent propagation paths between mobile terminals and the base station. In this paper we investigate the performance of Multi-carrier Two-way Two-hop (TW-TH) cooperative communication network in the presence of Rayleigh fading channel. We analyze a simple relay selection diversity scheme in TW-TH cooperative network. The two power allocation schemes with relay selection are discussed. Performance analysis shows that relay selection diversity scheme provides better performance than fixed relaying regardless of the availability of direct path between users.

Cooperative communication provides most of the advantages as multi-antenna systems due to availability of independent propagation paths between mobile terminals and the base station. In this paper we investigate the performance of Multi-carrier Two-way Two-hop (TW-TH) cooperative communication network in the presence of Rayleigh fading channel. We analyze a simple relay selection diversity scheme in TW-TH cooperative network. The two power allocation schemes with relay selection are discussed. Performance analysis shows that relay selection diversity scheme provides better performance than fixed relaying regardless of the availability of direct path between users.

Cooperative communication provides most of the advantages as multi-antenna systems due to availability of independent propagation paths between mobile terminals and the base station. In this paper we investigate the performance of Multi-carrier Two-way Two-hop (TW-TH) cooperative communication network in the presence of Rayleigh fading channel. We analyze a simple relay selection diversity scheme in TW-TH cooperative network. The two power allocation schemes with relay selection are discussed. Performance analysis shows that relay selection diversity scheme provides better performance than fixed relaying regardless of the availability of direct path between users.

Cooperative communication provides most of the advantages as multi-antenna systems due to availability of independent propagation paths between mobile terminals and the base station. In this paper we investigate the performance of Multi-carrier Two-way Two-hop (TW-TH) cooperative communication network in the presence of Rayleigh fading channel. We analyze a simple relay selection diversity scheme in TW-TH cooperative network. The two power allocation schemes with relay selection are discussed. Performance analysis shows that relay selection diversity scheme provides better performance than fixed relaying regardless of the availability of direct path between users.

Cooperative communication provides most of the advantages as multi-antenna systems due to availability of independent propagation paths between mobile terminals and the base station. In this paper we investigate the performance of Multi-carrier Two-way Two-hop (TW-TH) cooperative communication network in the presence of Rayleigh fading channel. We analyze a simple relay selection diversity scheme in TW-TH cooperative network. The two power allocation schemes with relay selection are discussed. Performance analysis shows that relay selection diversity scheme provides better performance than fixed relaying regardless of the availability of direct path between users.

Cooperative communication provides most of the advantages as multi-antenna systems due to availability of independent propagation paths between mobile terminals and the base station. In this paper we investigate the performance of Multi-carrier Two-way Two-hop (TW-TH) cooperative communication network in the presence of Rayleigh fading channel. We analyze a simple relay selection diversity scheme in TW-TH cooperative network. The two power allocation schemes with relay selection are discussed. Performance analysis shows that relay selection diversity scheme provides better performance than fixed relaying regardless of the availability of direct path between users.

This paper presents a Generalized Power Allocation (GPA) scheme for different users in Non-Orthogonal Multiple Access (NOMA) based wireless communication system. The power allocation to the users becomes complex with the increased number of users. There are some conventional schemes for power allocation in NOMA but they have to optimize some parameters arbitrarily. In this paper, a simple but effective power allocation scheme has been formulated and tested by simulations. The proposed GPA scheme does not need any parameter adjustment. Theoretical power distribution to different users of NOMA has been calculated using the proposed GPA technique. The calculated powers of individual users with the proposed scheme are different and more distributed than the arbitrary power allocation scheme which satisfies the basic condition of NOMA. The total of calculated powers with GPA scheme shows only 01% variation with the arbitrary power allocation scheme which shows the consistency of GPA scheme with other schemes. The performance of NOMA based wireless communication system with GPA scheme has been simulated under various conditions using Matlab. The simulated BER performance for NOMA based wireless communication system using different modulation techniques show similar results with other conventional schemes which validates the formulation of GPA scheme.

Cooperative communication provides most of the advantages as multi-antenna systems due to availability of independent propagation paths between mobile terminals and the base station. In this paper we investigate the performance of Multi-carrier Two-way Two-hop (TW-TH) cooperative communication network in the presence of Rayleigh fading channel. We analyze a simple relay selection diversity scheme in TW-TH cooperative network. The two power allocation schemes with relay selection are discussed. Performance analysis shows that relay selection diversity scheme provides better performance than fixed relaying regardless of the availability of direct path between users.

Cooperative communication provides most of the advantages as multi-antenna systems due to availability of independent propagation paths between mobile terminals and the base station. In this paper we investigate the performance of Multi-carrier Two-way Two-hop (TW-TH) cooperative communication network in the presence of Rayleigh fading channel. We analyze a simple relay selection diversity scheme in TW-TH cooperative network. The two power allocation schemes with relay selection are discussed. Performance analysis shows that relay selection diversity scheme provides better performance than fixed relaying regardless of the availability of direct path between users.

Cooperative communication provides most of the advantages as multi-antenna systems due to availability of independent propagation paths between mobile terminals and the base station. In this paper we investigate the performance of Multi-carrier Two-way Two-hop (TW-TH) cooperative communication network in the presence of Rayleigh fading channel. We analyze a simple relay selection diversity scheme in TW-TH cooperative network. The two power allocation schemes with relay selection are discussed. Performance analysis shows that relay selection diversity scheme provides better performance than fixed relaying regardless of the availability of direct path between users.

Cooperative communication provides most of the advantages as multi-antenna systems due to availability of independent propagation paths between mobile terminals and the base station. In this paper we investigate the performance of Multi-carrier Two-way Two-hop (TW-TH) cooperative communication network in the presence of Rayleigh fading channel. We analyze a simple relay selection diversity scheme in TW-TH cooperative network. The two power allocation schemes with relay selection are discussed. Performance analysis shows that relay selection diversity scheme provides better performance than fixed relaying regardless of the availability of direct path between users.

Cooperative communication provides most of the advantages as multi-antenna systems due to availability of independent propagation paths between mobile terminals and the base station. In this paper we investigate the performance of Multi-carrier Two-way Two-hop (TW-TH) cooperative communication network in the presence of Rayleigh fading channel. We analyze a simple relay selection diversity scheme in TW-TH cooperative network. The two power allocation schemes with relay selection are discussed. Performance analysis shows that relay selection diversity scheme provides better performance than fixed relaying regardless of the availability of direct path between users.

Cooperative communication provides most of the advantages as multi-antenna systems due to availability of independent propagation paths between mobile terminals and the base station. In this paper we investigate the performance of Multi-carrier Two-way Two-hop (TW-TH) cooperative communication network in the presence of Rayleigh fading channel. We analyze a simple relay selection diversity scheme in TW-TH cooperative network. The two power allocation schemes with relay selection are discussed. Performance analysis shows that relay selection diversity scheme provides better performance than fixed relaying regardless of the availability of direct path between users.

With increasing enormous interests have been attracted in theory area due to various technological merits of cooperative communication, particularly the issue of wireless systems are not able to support various antennas due to direction, size and other restrictions (Laneman, Tse &Wornell, 2004). Relay station can help the base station to communicate with a mobile station which is far away from the base station. Therefore, according to this property of relay station, which are generally used in a cellular system in order to extend the cell coverage of a mobile station. Relay station (RS) is fairly lower-cost and occupies smaller area in the real life and it can solve efficiently the issue of cell coverage. Relay station is one of the most significant factor to solve a number of legacy problems in an existing wireless network. This essay discusses relays from several aspects and related techniques. The concepts of relays initially would be mentioned to help reader understand relays' practical functions. In the theory field, it has been proposed transmission strategies and various cooperative diversity protocols which have the potential to improve cooperative techniques between the base stations of cellular systems. Osama, Sara, and Lutz (2012) insists that to guarantee the maximum possible the improvement of limitations by optimizing relays combined with designing other system parameters which is practically encouraged in systems adaptability. Finally, the placement of relay should have significantly considered into as important factors which is able to guarantee the the requirements of a communication link. For instance, the application of the optimal relay station would obviously affect the system performance that are kinds of achieving the improvement and development of diversity gain (Nosratinia, Hunter, & Hedayat, 2004). Concepts In the case of cell coverage extension scenario, the MS is not able to receive the signal of the BS as the MS is located out of the coverage of the BS. This must lead to the BS does not

In this paper, a novel Multi-relay Adaptive Random Selection (MARS) strategy in a dual-hop multi-relay OFDM sys tem is proposed. In this strategy, the relays cooperate according to contribution factors suggested by each relay. The selection of the OFDM sub-channels is based on uniform random distribution where the thresholds of the uniform random variable are asso ciated with the contribution factors. This approach guarantees fairness in allocating the resources in each relay. The approach is compared with static allocation of the OFDM sub-channels. The MARS strategy is tested in a multi relay system over flat and selective Rayleigh fading channels. Simulation results show the superiority of the proposed scheme in improving the OFDM system performance in terms of BER. The performance is achieved by creating a virtual diversity by randomizing the allocation where no channel information is required.

Cooperative communication provides most of the advantages as multi-antenna systems due to availability of independent propagation paths between mobile terminals and the base station. In this paper we investigate the performance of Multi-carrier Two-way Two-hop (TW-TH) cooperative communication network in the presence of Rayleigh fading channel. We analyze a simple relay selection diversity scheme in TW-TH cooperative network. The two power allocation schemes with relay selection are discussed. Performance analysis shows that relay selection diversity scheme provides better performance than fixed relaying regardless of the availability of direct path between users.