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Performance of Hybrid ARQ for NDMA Access Schemes with Uniform Average Power Control

F. Ganhão1,2, M. Pereira1,2, L. Bernardo(11, R. Dinis1,2, R. Oliveira2, and P. Pinto3
1. CTS, Uninova, Dep.o de Eng.a Electrotécnica, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
2. Instituto de Telecomunicações, Lisboa, Portugal

Abstract—Traditionally, a packet with errors, either due to channel noise or collisions, is discarded and needs to be retransmitted, leading to performance losses. Network Diversity Multiple Access (NDMA) handles collisions by combining a multipacket detection scheme with time diver¬sity. In NDMA, the Base Station (BS) forces mobile terminals (MTs) to transmit P copies of each packet when P MTs collide. Diversity combining is limited to P copies of the packets, not allowing it to adapt to severe errors due to channel noise. This paper considers a multipacket detection scheme recently proposed, which reduces the Packet Error Rate (PER) when more than P packet copies are available.
In this paper, a Hybrid-ARQ NDMA (H-NDMA) access mechanism is proposed. The access mechanism forces MTs with reception errors during a collision resolution epoch to transmit more than P times. Analytical models for Poisson traffic are proposed for the throughput and delay. The proposed system’s performance is evaluated for a Single-Carrier with Frequency Domain Equalization (SC¬FDE) scheme, and compared to classical NDMA. H-NDMA parameter configuration is defined in terms of Quality of Service (QoS) requirements. 12

Index Terms—Multipacket Detection; Network Diversity Multiple Access (NDMA); Hybrid-ARQ; Analytical Perfor¬mance.

Cite:Francisco Ganhão, Miguel Pereira, Luis Bernardo, Rui Dinis, Rodolfo Oliveira, and Paulo Pinto, "Performance of Hybrid ARQ for NDMA Access Schemes with Uniform Average Power Control," Journal of Communications, vol. 6, no.9, pp.691-699, 2011. Doi: 10.4304/jcm.6.9.691-699
 

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