Error Rate Performance of SC-FDMA with Channel Dependent Subcarrier Scheduling

Trivedi, Vinay Kumar; Sinha, Madhusudan Kumar; Kumar, Preetam

doi:10.1109/spin.2018.8474049

Cited by 4 publications

(2 citation statements)

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“…Moreover, optimal power allocation can be derived using KKT conditions as outlined in the work of the aforementioned authors and it is not included here due to space limitations. Favorable subcarriers are the ones that have the highest channel gains as per the frequency selective channel discussed in Section 3. Contrary to this, the method in the work of Chen et al treats all the resources as identical, which is not realistic for practical FDMA systems.…”

Section: System and Signal Modelmentioning

confidence: 99%

“…On the other hand, the subcarriers interleaving mode achieves a major diversity gain in a frequency selective channel and it is able to distribute the effect of a deep fade among all users. According to the work of Trivedi et al, channel‐dependent scheduling achieves the maximum diversity gain of the frequency selective channel. In this paper, we take both subcarriers mapping modes into consideration.…”

Section: System and Signal Modelmentioning

confidence: 99%

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Trigonometric transforms and precoding strategies for OFDM‐based uplink hybrid multi‐carrier nonorthogonal multiple access

Trivedi

Ramadan

Kumar

et al. 2019

Trans Emerging Tel Tech

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An uplink hybrid nonorthogonal multiple access (h-NOMA) scheme utilizing power domain multiplexing is adopted in this paper for orthogonal frequencydivision multiplexing (OFDM)-based systems. The OFDM-based NOMA systems can achieve high spectral efficiency with resilience to wireless multipath fading. The h-NOMA maintains a low interference level per resource block or low complexity of multiuser detection (MUD) implementation at the receiver and also achieves consistent fairness performance by restricting the maximum number of users per resource block. An improved user clustering algorithm for OFDM-based h-NOMA system under the assumption of user's distinct data rate requirement is presented here. The proposed algorithm takes into consideration both the channel gain of all activated users and the different data rate requirements of weak channel gain users. High peak-to-average power ratio (PAPR) and performance degradation due to strict frequency synchronization requirements are the main drawbacks of such an OFDM-based uplink h-NOMA system. High PAPR of multicarrier NOMA is addressed here with precoding techniques. An enhanced minimum mean square error (MMSE) receiver performing joint equalization and carrier frequency offset (CFO) compensation using low-complexity banded-matrix implementation is proposed to cancel interference in the frequency domain. The MUD is implemented with low-complexity successive interference cancellation (SIC) using bandedmatrix approximation of the interference matrix in the presence of CFO. Moreover, the possibility of utilizing efficient trigonometric transforms to implement OFDM-based NOMA is studied with CFO and estimation errors. For OFDM-based h-NOMA system, an efficient combination of different trigonometric transform configurations to constitute the multicarrier basis for OFDM with a suitable precoding strategy for PAPR reduction is studied.Trans Emerging Tel Tech. 2019;30:e3694.wileyonlinelibrary.com/journal/ett

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Section: System and Signal Modelmentioning

confidence: 99%

Section: System and Signal Modelmentioning

confidence: 99%