Indoor Distributed Antenna Systems Paving Way for 5G Networks in Homes and Offices

The launch of fourth-generation long-term evolution (4G LTE) completely changed mobile device broadband networking. Massive advances in network bandwidth have made it possible for society and consumers in general to undergo enormous transformation into the next generation wireless technology. Broadband network technology advancements have also enabled brand-new ecosystems to develop around the mobile application economy.

Now, the fifth generation (5G) network is set to disrupt nearly every industry. However, a significant shift in supporting architectures of electronics and communication technologies is required for an efficient transition from 4G to 5G. Bringing wireless connectivity indoors presents considerable implementation challenges. For instance, radio frequency (RF) transmissions can be hindered by building materials, necessitating the installation of indoor distributed antenna systems (DAS), repeaters, or small cells to provide appropriate wireless coverage.

The indoor DAS antenna is even necessary for 4G LTE systems today, but it will be considerably harder for the millimeter wave (mmWave) spectrum to provide the high speeds and low-latency connection associated with 5G while covering much smaller areas.

Due to the rapid 5G network advancements, the venue or building owners are inclined toward the 5G distributed antenna system infrastructure that is future-ready and scalable. This article examines how indoor DAS is laying the foundation for 5G networks.

How does the indoor DAS antenna ensure efficient penetration of signals?

In an active indoor DAS antenna, a power supply is required for the components to operate. An active DAS transforms the radio frequency transmissions from the source signal from analog to digital so that they can be transmitted across an ethernet or optical cable. A master unit, which blends the signals from various carriers, performs this conversion.

Figure 1 Indoor DAS antenna

The digital signal is delivered by an active DAS through ethernet or fiber optic cables to radio units (RUs), where it is converted back into an RF signal. These RUs may also occasionally be referred to as nodes or active antennas, depending on the vendor and the system design.

Building owners, property managers, and corporate clients have several options when there is a cellular service issue. Active DAS have historically been the only choice for many businesses. These are the suggested solutions for clients with capacity issues, such as stadiums for sporting events or airports, but they are costly and require months to deploy. It can take a long time to get permission to join a carrier network. Every additional carrier requires a repeat of the process.

Moving forward, the active DAS is being prepared for the advent of the 5G network. The advancements are discussed further in detail.

1.    5G-Based Active Indoor DAS: A 5G active DAS facilitates the transmission of 5G "New Radio" transmissions. A DAS designed for 5G frequently supports newer frequency bands, such as T-n41 Mobile's band and the upcoming n77 C-Band frequencies. Active 5G DAS performs better than aging 2G, 3G, and 4G networks. With this approach, scaling and upgrading are economical, straightforward, and flexible. It is possible to support both 22 and 44 multiple-input multiple-output (MIMO), and full control over the active elements is provided. Active DAS is a more long-term solution since it offers a more flexible option to meet future performance and capacity demands.

However, there are certain drawbacks as well, particularly considering the higher initial investment cost. If operator sharing is even conceivable, it might be challenging. Additionally, new fiber and cabling must be installed in order to deploy new DAS.

2.    5G-Based Active Digital Indoor DAS: A digital indoor DAS divides each carrier's signal into zeros and ones before combining them and sending them through a fiber optic or ethernet connection. As the conversion and combining processes require extensive computing work, digital DAS is much more expensive than analog DAS.

One of the numerous benefits of deploying an active system based on digital 5G is that it is more efficient and far less prone to interference. Another benefit of digital 5G-based active system platforms is the capability to direct the signal sources to different areas of a venue. When a building's capacity varies, as it would if a sizable cafeteria or event space were present at a school, university, or place of business, this is essential.

If the signal source and digital indoor DAS platform both comply with the Common Public Radio Interface (CPRI) specification, it is possible for the baseband unit (BBU) of a signal source to communicate directly with the DAS master unit without passing through the remote units and without any conversion to an analog RF signal.

3.    5G-Based Active Analog Indoor DAS: An analog RF signal is modulated over light and transferred from one end to the other over an optical fiber line in a 5G-based active analog DAS. Before being transmitted, the signal must first be demodulated before being amplified and connected to antennas at the other end. The analog RF signal is initially converted into a digital signal in the active DAS's digital architecture. The signal is then routed to an optical transmitter before being transmitted via optical cable to the optical receiver.

Further, at the optical receiver, the signal is converted back to digital form from its modulated light form. The demodulated signal is received by the DAS, which then restores it to the analog form. This analog signal is boosted and broadcast via an antenna to give 5G service without any non-coverage within areas such as buildings.


It is evident that the introduction of 5G will change the way people live. There will be hundreds of smart towns by 2030 where every wireless device will be linked to the cellular network and to one another. Some of the most striking improvements brought about by the arrival of 5G might be seen in commercial areas, public buildings, and workplaces with the help of indoor DAS antenna systems.

Therefore, driven by increasing mobile data traffic, the growing need for enhanced cellular capacity in public venues, the increasing need for improved coverage in buildings, and the growing demand for enterprise mobility, the global indoor DAS market is expected to grow significantly.

According to the BIS Research report, the global indoor DAS market is projected to reach $17.16 billion by 2031 from $5.79 billion in 2021, growing at a CAGR of 11.66% during the forecast period 2022-2031.

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