Donor antenna design, headend siting, fiber and coax distribution network design, remote unit placement, multi-carrier coordination, and PIM analysis for outdoor distributed antenna system deployments — stadiums, urban corridors, campuses, and transit infrastructure. All 50 U.S. states. MBE-certified.
A distributed antenna system (DAS) is a network of spatially separated antenna nodes connected to a common source — a headend — that distributes the RF signal across a coverage area. Outdoor DAS is deployed where macro cell coverage is insufficient due to signal blockage, capacity constraints, or where reliable cellular coverage is required across a defined area such as a stadium campus, transit corridor, or dense urban zone.
The engineering of an outdoor DAS system involves RF coverage analysis, donor antenna and signal source design, headend location selection, fiber or coax distribution network design from the headend to each remote unit, remote antenna unit (RAU) placement and mounting, power coordination, and multi-carrier integration for systems serving multiple operators. DAS is increasingly deployed as a neutral host system — a single infrastructure serving multiple carrier tenants — which requires RF design that accommodates multiple frequency bands and power levels simultaneously.
Draftech's OSP engineering background is directly applicable to the distribution network design. The fiber runs from headend to remote units are outside plant engineering work — with the same route planning, conduit design, splice documentation, and handhole placement as any other fiber distribution network. Designing the RF system and the fiber distribution under one team eliminates the coordination gap that creates schedule delays and construction conflicts when these disciplines are separated.
Draftech delivers complete outdoor DAS engineering — from RF coverage analysis and donor antenna design through headend siting, fiber distribution, remote unit placement, and PIM analysis for multi-carrier systems.
Signal propagation modeling for the outdoor coverage area, carrier frequency band analysis, coverage gap identification, and remote unit placement design to achieve target RSRP and SINR across the deployment zone.
Signal source selection and design — donor antenna placement on the nearest macro site, BDA (bi-directional amplifier) specifications, and signal level budget from donor to headend.
Headend location selection, equipment room or cabinet specifications, power requirements, cooling design, and multi-carrier rack configuration for neutral host systems.
Fiber route design from headend to each remote unit location — aerial and underground routing, splice plan, conduit specifications, handhole placement, and cable schedule.
RAU mounting location design, pole or structure attachment specifications, mounting detail drawings, and power coordination for each remote node location.
Passive intermodulation (PIM) analysis for multi-carrier systems, frequency plan coordination across carrier tenants, and interference mitigation design.
Outdoor DAS deployments serve four primary environments where macro signal penetration, coverage consistency, or capacity demand makes traditional small cell or macro infrastructure insufficient:
Operators building shared DAS infrastructure to serve multiple carrier tenants — requiring multi-carrier RF design and fiber distribution for neutral host systems. Single infrastructure, multiple revenue streams.
AT&T, Verizon, T-Mobile deploying carrier-specific outdoor DAS for coverage and capacity in high-demand outdoor environments where macro cells and small cells cannot deliver adequate performance.
Sports teams, entertainment companies, and venue management organizations requiring outdoor coverage solutions for campus-scale events. End-to-end DAS design that meets carrier program requirements.
Metropolitan transit agencies and rail operators requiring reliable outdoor cellular coverage across stations and transit corridors. Coverage design to meet carrier SLA requirements and passenger service standards.
Small cells are standalone low-power nodes — each has its own radio unit, antenna, and connection to the network. An outdoor DAS is a distributed system where a central headend feeds signal through a distribution network of passive or active components to multiple remote antenna units. DAS is generally used where a defined coverage zone needs to be served with consistent signal quality and capacity, and where the signal distribution can be more efficiently handled through a central headend than through individually connected small cells. Neutral host DAS is particularly suited to stadium campuses and transit environments where multiple carriers need coverage from the same infrastructure.
Yes. The fiber runs from headend to remote antenna units are outside plant engineering — the same route planning, conduit design, splice documentation, and ROW permitting work that Draftech performs for fiber networks and wireless backhaul. Designing both the RF system and the fiber distribution under one team eliminates the coordination gap between wireless design and OSP design that creates schedule delays and construction conflicts.
Passive intermodulation (PIM) occurs when two or more RF signals mix in a passive component — a connector, cable, or antenna — and generate interference at frequencies that fall within an active receive band. PIM is a significant issue in multi-carrier DAS systems where multiple frequency bands are present in the same distribution network. Draftech's DAS design includes PIM analysis to identify potential intermodulation products and specify connector and component quality standards that minimize PIM risk.
Whether you're building a neutral host DAS for a stadium campus, deploying outdoor coverage for a transit corridor, or solving coverage gaps in a dense urban environment, Draftech delivers complete outdoor DAS engineering — RF design through fiber distribution. All 50 U.S. states. MBE-certified.
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