The Needs of In-building and Outdoor DAS
In today’s high speed LTE networks, a low level of passive intermodulation (PIM) distortion is becoming increasingly important in both macrocellular and in-building networks. PIM issues occur when co-locating carriers install new equipment, or when overlaying new carriers run into old antennas. PIM lowers the reliability, capacity, and data rate of cellular networks by limiting receiver sensitivity, which increases bit-error-rate (BER), and causes more dropped calls. If there is a data connection, interference from PIM creates more data resends, which lowers overall throughput. In extreme cases, high PIM levels can cause receiver blocking, shutting down the sector.
With LTE’s high speed data connections, the peak power produced by the modulation schemes increases dramatically when compared to legacy protocols, which exacerbates PIM problems. Low-PIM is a serious concern for mobile network operators w...
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