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In a communication system using microwave waves (microwave links), noise and multipath fading can reduce and reduce the performance of the communication system. The propagation of microwaves is influenced by several things in the reception system, apart from having to LOS (Line Of Sight), there is a signal reflection from the surface that causes interference (multipath signal). By using the technique of maximum diversity ratio combining on systems that are exposed to noise and fading is used through BER (Bit Error Rate) analysis. Research on BER in AWGN channel with QPSK modulation using MRC technique for 3 times treatment with BER value of 20.05 dB, 14.86 dB, 12.12 dB. BER testing concludes that MRC technique can improve performance on microwaves Intisari— Pada system komunikasi menggunakan gelombang microwave ( link microwave ), adanya noise serta multipath fading dapat mengurangi dan menurunkan kinerja system komunikasi. Perambatan gelombang mikro dipengaruhi beberapa hal pada system penerimaan selain harus LOS ( Line Of Sight ) terdapat sinyal pantulan dari permukaan yang sangat menimbulkan interferensi ( sinyal multipath ). Dengan menggunakan teknik diversity maximal ratio combining pada system yang terkena noise dan fading digunakan melalui analisa BER ( Bit Error Rate ). Penelitian BER di kanal AWGN dengan modulasi QPSK menggunakan teknik MRC sebanyak 3 kali perlakuan nilai BER sebesar 20.05 dB, 14.86 dB, 12.12 dB. Pengujian BER memberikan kesimpulan teknik MRC mampu meningkatkan kinerja pada gelombang mikro. Kata Kunci — Maximal Ratio Combining, Noise, Multipath Fading, BER

Peningkatan Unjuk Kerja Pada Link Microwave Menggunakan Teknik Diversity Maximal Ratio Combining