研究目的
To study the difference between the uplink and downlink channels of short-range slant free-space optical wireless communication using massive MIMO linear arrays, including modeling atmospheric loss, scintillation, beam spreading, and pointing error, and analyzing their variations with distance and wavelength.
研究成果
The study concludes that uplink and downlink atmospheric losses are identical, but uplink receiver beamwidth is larger, while downlink spatial coherence length and pointing error variance are larger. These parameters change monotonically with wavelength and propagation distance. The relative mean square error has non-monotonic trends with extreme points depending on wavelength, and uplink bit error rate is higher than downlink, increasing with wavelength and SNR. The findings highlight non-reciprocity in channels due to atmospheric turbulence effects.
研究不足
The research is limited to short-range communication (up to 4000 m) and specific wavelengths (632 nm, 850 nm, 1550 nm). It assumes independent channels with atmospheric correlation length less than transmitter/receiver spacing, and does not account for channel correlation at longer distances or different array arrangements (e.g., plane arrays). Further study is needed for propagation distances above 4000 m and other turbulence conditions.
1：Experimental Design and Method Selection:
The study uses theoretical modeling and simulation based on Kolmogorov turbulence spectrum to construct uplink and downlink channel models for optical wireless communication with massive MIMO linear arrays. Methods include approximations for spherical waves and derivations of atmospheric loss, scintillation, beam spreading, and pointing error models.
2：Sample Selection and Data Sources:
Simulations are performed using parameters such as number of antennas, receive aperture width, beamwidth, spacing, zenith angle, distance, wavelength, and noise variance as specified in Table 1. Data is generated through mathematical models rather than empirical measurements.
3：Data is generated through mathematical models rather than empirical measurements.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: No specific physical equipment is mentioned; the study is simulation-based using computational tools.
4：Experimental Procedures and Operational Workflow:
The workflow involves deriving mathematical expressions for channel components, simulating their behavior under varying conditions (e.g., distance and wavelength), and analyzing results through plots and comparisons.
5：Data Analysis Methods:
Analysis includes comparing uplink and downlink parameters, calculating bit error rate and relative mean square error using derived expressions, and interpreting simulation results to draw conclusions.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
