Abstract
Fifth-generation (5G) mobile systems are a necessary step toward successfully achieving further increases in data rates. As the use of higher-order quadrature amplitude modulation (QAM) is expected to increase data rates within a limited bandwidth, we propose a method for orthogonal frequency division multiplexing (OFDM)-based 1024- and 4096-QAM transmission with soft-decision Viterbi decoding for use in 5G mobile systems. Through evaluation of the transmission performance of the proposed method over multipath fading channels using link-level simulations, we determine the bit error rate (BER) performance of OFDM-based 1024- and 4096-QAM as a function of coding rate under two multipath fading channel models: extended pedestrian A (EPA) and extended vehicular A (EVA). We also demonstrate the influence of phase error on OFDM-based 1024- and 4096-QAM and clarify the relationship between phase error and the signal-to-noise ratio (SNR) penalty required to achieve a BER of 1 × 10−2. This work provides an effective solution for introducing higher-order modulation schemes in 5G and beyond.
Highlights
Fifth-generation (5G) mobile systems are being developed worldwide with the objectives of increasing system capacity and data rates, achieving low latency, improving user throughput, and supporting “Internet of Things” services
As the use of higher-order quadrature amplitude modulation (QAM) is expected to increase data rates within a limited bandwidth, we propose a method for orthogonal frequency division multiplexing (OFDM)-based 1024- and 4096-QAM transmission with soft-decision Viterbi decoding for use in 5G mobile systems
We demonstrate the influence of phase error on OFDM-based 1024- and 4096-QAM and clarify the relationship between phase error and the signal-to-noise ratio (SNR) penalty required to achieve a bit error rate (BER) of 1 × 10−2
Summary
Fifth-generation (5G) mobile systems are being developed worldwide with the objectives of increasing system capacity and data rates, achieving low latency, improving user throughput, and supporting “Internet of Things” services. Relay systems are an alternative approach to denser infrastructures that are primarily useful in improving cell edge performance in macro-cells [17,18,19] In this scheme, a relay node (RN) installed at a macro-cell edge where the received signal power from the serving eNB is low can transmit a strengthened signal to the UE. The use of 3D beamforming by MIMO antennas enables directs signal transmission toward a target UE, potentially increasing the received signal-to-noise ratio (SNR) or signal-to-interference plus noise ratio (SINR) while reducing the interference directed to adjacent cells and other UEs [20,21,22] New technologies such as the small-cell strategy, HetNets, relay systems, and 3D beamforming that improve the received SINR will enhance the introduction of higher-order QAM schemes.
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