Dear Nizar Sghaier ,

I think one major challenge is the intercoupling between the adjacent antennas as they are closed packed as possible in order to accommodate as large number of antennas as possible in the smallest possible space.

This problem gets more acute in the receiver.

An other problem is to control the radiation nulls and the the direction of the major loop for antenna arrays.

We tried to treat the problem of coupling in the following paper:Article Design of a Planar MIMO Antenna for LTE-Advanced

Dear Nizar Sghaier ,

I think one major challenge is the intercoupling between the adjacent antennas as they are closed packed as possible in order to accommodate as large number of antennas as possible in the smallest possible space.

This problem gets more acute in the receiver.

An other problem is to control the radiation nulls and the the direction of the major loop for antenna arrays.

We tried to treat the problem of coupling in the following paper:Article Design of a Planar MIMO Antenna for LTE-Advanced

Dear Nizar Sghaier

As mentioned above by professor Zekry, the separation between the antennas in the millimeter(mm) band is very small as well as the dimensions of the antenna elements are small too. In addition, the antenna element edges should be fabricated accurately as smooth as possible in order to avoid the unintended radiation caused by the very short wavelength of the mm waves.

The great challenges are faced in the fabrication process because the mm wave design requires a very precise engraving machines.

Good Luck.

In my opinion, more specific design challenges for MIMO antenna in 5G has Massive MIMO digital antenna arrays. Particularly, need to say about communication lines, distribution of Analog-to-Digital converters signals. In this regard, I think that need implemented radio photonics concept of such antenna arrays.

On the other hand, very important is identical characteristics of antenna elements and receiver channels and decreasing of jitter.

For additional information, you can read these articles:

Conference Paper LIMITING DEPTH OF JAMMER'S SUPPRESSION IN A DIGITAL ANTENNA ...

Article Influence of jitter in ADC on precision of direction-finding...

Patent Method for correction of inter-channel and quadrature non-id...

The design challenge depends on the fundamental parameters like, Coupling and distance between the single elements calculations.

Frequency bands Though 4G LTE already operates on established frequency bands below 6GHz, 5G requires frequencies —  all the way up to 300GHz. Some are better known as mmWave. Those bands can carry far more capacity and deliver ultra-fast speeds that deliver a 20-fold increase over LTE’s fastest theoretical throughput.

Wireless carriers still need to bid for the higher spectrum bands as they build and roll out their respective 5G networks. In Canada, for example, the federal government held a spectrum auction for 600MHz in 2019, with 3500MHz ongoing for 2020 and 1GHz currently planned for 2021. More are likely to follow after that. In the US, millimeter wave (mmWave) spectrum auctions netted $4.47 billion (US) — the largest single total in the country’s history — as of the spring in 2020.

2Deployment and coverage Despite 5G offering a significant increase in speed and bandwidth, its more limited range will require further infrastructure. Higher frequencies enable highly directional radio waves, meaning they can be targeted or aimed — a practice called beamforming. The challenge is that 5G antennas, while able to handle more users and data, beam out over shorter distances.

Even with antennas and base stations getting smaller in this scenario, more of them would likely have to be installed on buildings or homes. Cities will probably need to install extra repeaters to spread out the waves for extended range, while also maintaining consistent speeds in denser population areas. It’s likely carriers will continue to use lower-frequency bands to cover wider areas until the 5G network matures.

In the future, it may mean that modems and Wi-Fi routers are replaced with 5G small cells or other hardware to bring 5G connections into homes and businesses, thus doing away with wired internet connections as we know them today. Spreading out access to rural areas will be as much of a challenge as it was with LTE.

3Cost to build, cost to buy Building a network is expensive, and carriers will raise the money to do it by increasing customer revenue. Much like LTE plans incurred a higher initial cost, 5G will probably follow a similar path. And it’s not just building a layer on top of an existing network — it’s laying the groundwork for something new altogether.

According to Heavy Reading’s Mobile Operator 5G Capex, total global spending on 5G is set to reach $88 billion by 2023. Once it becomes truly viable, certain device segments will be connected in entirely new ways, particularly vehicles, appliances, robots and city infrastructure.

📷

Now that 5G-enabled smartphones and other devices are trickling into the market, networks are evolving in various countries across the globe. Autonomous vehicle technology is already in the market in limited forms, but fully autonomous vehicles are years away, and would otherwise drive blind without a super-fast network like 5G to communicate.

The concept behind the Internet of Things (IoT) is predicated on a fast network that can tie devices and services together. That is one of the promises analysts have forecasted for 5G’s potential, but people will first want to see how much the additional speed will enrich their lives.

4Regulations and standards Government regulators will figure into 5G deployment, particularly with the additional infrastructure required to spread out the network. Providers will need to install new antennas, base stations and repeaters.

Beyond that, regulators will need to tackle 5G services in waves across multiple vertical sectors. These can include spectrum availability, EMF radiation regulations, infrastructure sharing, and cybersecurity. A Research and Markets report dives into the various facets and challenges involved in getting there.

Canada’s largest telecom operators have committed to building out their respective networks within regulated limits set by Innovation, Science and Economic Development Canada (ISED), the Canadian Radio-television and Telecommunications Commission (CRTC) and Health Canada.

See also📷

The role of 5G in autonomous vehicles

The Politics

In the U.S., all four major carriers are running 5G networks with limited connectivity to select markets. The Federal Communications Commission (FCC) opted not to change RF frequency limits nor alter regulations related to 5G rollout. That may also open doors for smaller players and new entrants to offer regional and local services. 

In Europe, carriers in the U.K. have already acted on their respective plans to expand in 2020, despite pushback and attacks on telecom workers and towers. The country’s communications regulator has deemed 5G signals to be within internationally-approved guidelines. 

For its part, the European Union has actively promoted 5G development as part of its economic growth plans and released details on how member countries will approach research and standards. Spectrum auctions that were postponed due to the pandemic may take place before the end of 2020.

Meanwhile, China already has 50 million 5G phone subscribers, with the country on track to reach 70 percent of 5G smartphone contracts by the end of 2020. South Korea lags behind but is intent on expanding its own network, while Thailand is on pace to lead the way for countries in Southeast Asia.

5Security and privacy This would be a challenge with any data-driven technology, but the 5G rollout will have to contend with both standard and sophisticated cybersecurity threats. Though 5G falls under the Authentication and Key Agreement (AKA), a system designed to establish trust between networks, it would currently be possible to track people nearby using their phones.  They could even eavesdrop on live phone calls.

Much like it is now, the onus will be on the carriers and network consortiums to provide a digital safety net for customers, except user complacency could be equally problematic.

With data speeds expected to be magnitudes faster than current levels, so too will connectivity increase. It will force cloud-based and data virtualization services to be as airtight as possible to protect user data and privacy. On the same token, their users will have to be more careful and vigilant as stewards of their data.

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