Abstract
This paper presents rain attenuation effects on the performance of the full-duplex link in a tropical region based on one-year measurement data at 73.5- and 83.5-GHz E-band for distances of 1.8 km (longer links) and 300 m (shorter links). The measured rain attenuations were analyzed for four links, and the throughput degradation due to rain was investigated. The findings from this work showed that the rain attenuation for both frequencies (73.5 and 83.5 GHz) of E-band links are the same. The rain rates above 108 and 193 mm/h caused an outage for the longer and shorter links, respectively. The 73.5 and 83.5 GHz bands can support the full-duplex wireless back-haul link under rainy conditions with outage probability of 2.9×10−4 and 6×10−5 for the longer and shorter links, respectively. This work also finds that the heavy rain with rain rates above 80 mm/h for long link and 110 mm/h for short link causes about 94% and 0.90% degradation of maximum throughput. The application of these findings would help improve the architecture and service of full-duplex wireless E-band links that are established at other sites and in other tropical areas.
Highlights
For ultra-high capacity point-to-point communications, the 71–76 and 81–86 GHz bands are worldwide licensed, and are capable of up to 5-GHz full-duplex bidirectional transmission
The largest deviation between the cumulative distribution function (CDF) of the measured rain rate and the ITU-R model appears at low percentage of time (0.001%) with around 60 mm/h difference
For the long link of 1.8-km LOS path, Figure 7 shows that the rain rates above 5 mm/h and below 32 mm/h degrade the throughput by 1 Gbps
Summary
For ultra-high capacity point-to-point communications, the 71–76 and 81–86 GHz bands (mostly known as the “E-band”) are worldwide licensed, and are capable of up to 5-GHz full-duplex bidirectional transmission. The ITU-R models [2,3,4,5] for rain attenuation have been used to ensure the planned radio links meet the quality requirements These models for conventional microwave bands are well examined in different temporal and tropical regions around the world [6,7,8,9], there are less empirical data for the E-band. In Malaysia, the rainfall rate statistics and rain attenuation were investigated based on a one-year measurement data at 21.8 and 73.5 GHz in [17,18]. The performance of full-duplex E-band wireless back-haul link along 1.8-km and 300-m distances is investigated based on the one-year outage probability under rain effects.
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