Efficient signal design and optimal power allocation for visible light communication attocell systems

Area of Science:

• Wireless Communication
• Optical Engineering

Background:

• Visible light communication (VLC) systems face interference challenges in dense attocell deployments.
• Overlapping attocells in VLC systems necessitate novel interference mitigation techniques.

Purpose of the Study:

• To propose and analyze a novel signal design, time superposition reuse (TSR), for VLC attocell systems.
• To develop an optimal power allocation strategy for the proposed TSR scheme.
• To evaluate the performance benefits of TSR over existing methods.

Main Methods:

• Time superposition reuse (TSR) signal design with overlapping time slots.
• Optimal power allocation strategy based on user position and superposition level.
• Derivation and analysis of optimal Euclidean distance.
• Performance comparison with uniform power allocation and time division multiple access (TDMA).

Main Results:

• TSR allows flexible spectral efficiency and system performance adjustment.
• The optimal power allocation strategy outperforms uniform allocation.
• Optimal Euclidean distance is dependent on signal delay and sampling period.
• TSR significantly improves performance compared to TDMA in VLC attocell systems.

Conclusions:

• TSR is an effective strategy for mitigating interference and enhancing spectral efficiency in VLC attocell systems.
• The proposed optimal power allocation strategy maximizes system performance.
• TSR offers a significant performance advantage over TDMA for users in VLC attocell environments.