modulated Johnson noise 通信的数据率瓶颈
问题概述
The article introduces a communication method based on modulated Johnson noise, but practical experiments show extremely low throughput (≈26 bps at 1.5 m, dropping to 22 bps at 4.5 m) and raise doubts about real‑world feasibility due to antenna complexity, power limits, and thermodynamic concerns.
痛点标签
- 在 1.5 m 距离下仅能实现约 26 波特的吞吐量，距离增至 4.5 m 时下降至 22 波特
- 天线和功率受限，需使用特定 RF 开关（如 ADG90x），增加噪声和实现复杂度
- 对能量来源的质疑，涉及热力学第二定律，是否违背基本物理
- 在多发射机真实环境中的干扰和解码难度
- 对实际应用场景的可行性存疑，缺乏明确的商业或工程需求
待验证问题
- 在实际部署中能否提升到至少 100 bps 的数据速率？
- 是否存在成本可接受的天线或 RF 开关方案来降低噪声？
- 在多用户或非理想环境下，系统的解码性能会如何受影响？
证据
原话
26 bps at 1.5 m: And what exactly do we expect to carry with this communication channel? If you add horned antennas it becomes a ridiculous design just to gain a few more bytes. If you add antenna arrays then it's no longer cheap. Your transmitter's output power is basically hard limited by Boltzmann constant, so just increasing range means you will have a bad time decoding it. Digital tricks, cryogenics... maybe a few more bytes, but is it enough?I'm really struggling to see if this can be useful for anything.
原话
Shouldn't this be impossible by the second law of thermodynamics? Receiving more energy when a resistor in thermal equilibrium is connected to an antenna seemingly implies that energy gets transferred from an antenna with a resistor to a an antenna without a resistor, even at thermal equilibrium.
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