利用高斯拟合函数确定了小发散角LED的类高斯发光模式，并根据光辐射特性和发光模式建立了LED直视信道模型.实际测量了服从朗伯、类高斯发光模式的多种多波段LED的接收光功率与信道参数的关系.实验结果表明，接收光功率的实测值与信道直流增益计算的理论值的平均相对误差小于±6%，该结果验证了本文提出的直视信道模型的正确性.

Gauss fitting function is used to determine the Gauss-like radiation pattern of LED with small divergence angle, and the line-of-sight channel model of LED is established according to the optical radiation characteristics and radiation pattern. The relationship between the received optical power and the channel parameters of various multi-band LEDs obeying the Lambertian and Gauss-like modes is actually measured. The experimental results show that the average relative error between the measured value of received optical power and the theoretical value of channel DC gain calculation is less than ±6%, which verifies the versatility and correctness of the line-of-sight channel model proposed in this paper.