Abstract
Recently, research on sixth-generation (6G) networks has gained significant interest. 6G is expected to enable a wide-range of applications that fifth-generation (5G) networks will not be able to serve reliably, such as tactile Internet. Additionally, 6G is expected to offer Terabits per second (Tbps) data rates, 10 times lower latency, and near 100% coverage, compared to 5G. Thus, 6G is expected to expand across all available spectrums including terahertz (THz) and optical frequency bands. In this manuscript, mixed-carrier communication (MCC) is investigated as a novel physical layer (PHY) design for 6G networks. The proposed MCC version in this study is based on visible light communication (VLC). MCC enables a unified transmission PHY design to connect devices with different complexities, simultaneously. The design trade-offs and the required signal-to-noise ratio (SNR) per individual modulation schemes embedded within MCC are investigated. The complexity analysis shows that a conventional optical OFDM receiver can capture the high-speed bit-stream embedded within MCC. For a forward error correction (FEC) bit-error-rate (BER) threshold of 3.8×10−3, MCC is optimized to maximize the spectral efficiency by embedding 2-beacon phase-shift keying (2-BnPSK) within an MCC envelope on top of 12 bits per beacon position modulation (BPM) symbol.
Highlights
Enhanced Mobile BroadBand, massive-Machine Type Communications, and Ultra-Reliable and Low-Latency Communications (URLLC) have gained the most significant interest in the fifth-generation (5G) networks era
mixed-carrier communication (MCC) enables transmission by design to highspeed receivers based on multi-carrier orthogonal frequency division multiplexing (OFDM), as well as limited power Internet of Things (IoT) sensors without trading off spectral efficiency
pulse width modulation (PWM)-sampled beacon is composed of reshaped ACO-OFDM samples to formulate a PWMlike envelope as shown in Equation (4)
Summary
Enhanced Mobile BroadBand (eMBB), massive-Machine Type Communications (mMTC), and Ultra-Reliable and Low-Latency Communications (URLLC) have gained the most significant interest in the fifth-generation (5G) networks era. Another example is the HACO-OFDM which achieves the same spectral efficiency as DCO-OFDM It combines both ACO-OFDM and pulse amplitude modulated discrete multitone (PAM-DMT) signals, a more complex transmitter and receiver design is required to generate and process both signals separately. MCC enables transmission by design to highspeed receivers based on multi-carrier OFDM, as well as limited power IoT sensors without trading off spectral efficiency. This means MCC offers simultaneous broadband access, lowrate IoT connectivity, device-free sensing, and device-based localization [7,19,20].
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