如何计算Link Budget
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Calculates wireless link margin comparing transmit power and gains against path loss and noise. Determines link reliability and range.
公式
Path loss = 20 log10(4πd×f/c)
分步指南
- 1Transmit power + antenna gain - cable loss - path loss + receive gain - noise figure = link margin
- 2Path loss = 20 log10(4πd×f/c)
- 3Positive margin = good signal; negative = insufficient range
- 4Typical 10-20 dB margin for reliability
例题解析
输入
Tx 30dBm, path loss 100dB
结果
-70dBm rx
常见错误注意事项
- ✕Not accounting for cable losses (2-3 dB typical)
- ✕Using theoretical max power instead of regulated output
常见问题
What's acceptable link margin?
Minimum 3 dB; 10+ dB good; 20+ dB excellent; accounts for fading and interference.
How do I improve link budget?
Increase transmit power, better antennas, lower frequency, shorter distance, or better receiver.
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