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High-fidelity and low-latency mobile fronthaul based on segment-wise TDM and MIMO-interleaved arraying
Optics Express
|February 7, 2018
Summary
This study introduces a novel segment-wise Time Division Multiplexing (TDM) arraying scheme for analog mobile fronthaul systems. This method enhances signal fidelity and supports higher-order modulation like 256-QAM with low latency.
Area of Science:
- Telecommunications Engineering
- Signal Processing
- Wireless Communication Systems
Background:
- Analog mobile fronthaul systems face challenges in maintaining signal fidelity due to bandwidth limitations.
- Existing Time Division Multiplexing (TDM) schemes require optimization for higher bandwidth efficiency and lower latency.
Purpose of the Study:
- To propose and validate an advanced arraying scheme for TDM-based analog mobile fronthaul systems.
- To enhance signal fidelity and reduce multiplexed signal bandwidth without additional processing.
Main Methods:
- Developed a segment-wise TDM aggregation scheme using antenna carrier signal (AxC) segments as the granularity.
- Conducted theoretical analysis and experimental validation with ~7-GHz bandwidth and 20 8x8 MIMO group signals.
- Employed digital signal processing (DSP) for system realization.
Main Results:
- The segment-wise TDM scheme is compatible with MIMO-interleaved arraying, improving bandwidth efficiency.
- The proposed scheme meets 5G latency requirements and significantly reduces multiplexed signal bandwidth.
- Experimental results demonstrated support for 256-Quadrature Amplitude Modulation (QAM) with 250-ns latency, surpassing ordinary TDM's 64-QAM capability.
Conclusions:
- The segment-wise TDM arraying scheme offers superior signal fidelity and performance in bandwidth-limited mobile fronthaul systems.
- This approach provides a practical solution for achieving high-order modulation and low latency essential for 5G networks.
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