Accurate uplink spectral efficiency for non orthogonal multiple access in Nakagami fading

Sedtheetorn, Pongsatorn; Panyim, Korporn

doi:10.1109/ecticon.2016.7560907

Cited by 4 publications

(1 citation statement)

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“…Their results show that cascade computation can outperform the iterative detection and decoding scheme. Authors in [16] considered a single-cell scenario where active users follow a Poisson Point Process (PPP). All the active users are known at the AP and are scheduled together.…”

Section: A Related Workmentioning

confidence: 99%

Grant-Free Massive NOMA: Outage Probability and Throughput

Abbas,

Shirvanimoghaddam,

et al. 2017

Preprint

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In this paper, we consider a massive uncoordinated non-orthogonal multiple access (NOMA) scheme where devices have strict latency requirements and no retransmission opportunities are available. Each device chooses a pilot sequence from a predetermined set as its signature and transmits its selected pilot and data simultaneously. A collision occurs when two or more devices choose the same pilot sequence. Collisions are treated as interference to the remaining received signals.We consider successive joint decoding (SJD) and successive interference cancellation (SIC) under a Rayleigh fading and path loss channel model. We first derive the expression for the outage probability for the case where devices transmit at the same fixed rate. Then, we derive the expression for the maximum achievable throughput for the case where devices transmit with rateless codes. Thus, their code rate is adaptive to the system conditions, i.e., load, received powers, and interference. Numerical results verify the accuracy of our analytical expressions. For low data rate transmissions, results show that SIC performs close to that of SJD in terms of outage probability for packet arrival rates up to 10 packets per slot. However, SJD can achieve almost double the throughput of SIC and is, thus, far more superior.

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Section: A Related Workmentioning

confidence: 99%