What is the difference between single cell and multicell massive MIMO? Is there any difference available apart from inter cell interference or pilot contamination?
In single cell,the issue of co-tier and cross-tier problem does not arise but in multicell it does arise.I hope it helps.
Nusrat Hussain Fatema: In the single-cell case there is no interference from other cells and it is possible to give each user a unique pilot sequence. The performance will be much better in this case, due to the lack of both pilot contamination and inter-cell interference. The main question is: In which practical deployment scenarios is it reasonable to use a single-cell model.
Omid m.kandelusy: Sure, it works. There is a real-time testbed implementation at Lund University. I've seen it myself :)
You can find a lot of papers on massive MIMO at this page: http://massivemimo.eu/research-library There is even a special category called "Implementation and demos" that might be of interest to you.
When it comes to the economical feasibility, it is far to early answer this. The testbed that I mentioned above is built using off the shelf hardware components that anyone could buy if they have enough money... An important and active research topic is how to design hardware that is tailored for massive MIMO. Small compact dipole antennas with a compact builtin RF chains.
Thank you Sir Emil Bjornson...
But I have little confusion regarding the advantages of Multi cell Massive MIMO over Single cell one. Despite of having inter-cell interference & pilot contamination, why would we still prefer Multi cell massive MIMO environment? Is it due to higher throughput/ gain?
Again in Multi cell Massive MIMO scenarios Base station can work cooperatively (connected to blackhaul network and controlled centrally) or independently, what are the differences between them?
If you have a system with multiple cells, it is usually better to let all transmit simultaneously in a multicell massive MIMO fashion, than letting the cells take turns in using the spectrum. The total throughput will be much higher.
Base stations can certainly cooperate and the performance will be better than when they operate independently. There is a concept called cell-free massive MIMO that describes the extreme case where all Base stations cooperate.
Here is a paper on cell-free Massive MIMO: http://arxiv.org/abs/1505.02617
Dear Prof. Bjornson,
You have raised a question in your response that "The main question is: In which practical deployment scenarios is it reasonable to use a single-cell model. "
Would you please let me know what is your answer to this crucial question? Also I have seen that you have some papers on single-cell scenario. Would you kindly let me know what is the motivation behind considering the single-cell model as it dose not seem a relist scenario?
Dear Mohammadali Mohammadi.
A good research methodology is to first consider a simple model, to learn how it behaves, and then gradually improve the model. If you start with the most advanced system model there is a risk that you will get stuck immediately.
I have written papers on massive MIMO that focus on the single-cell case, because the main focus was not to describe how inter-cell interference affects the system but other aspects (e.g., the impact of imperfect hardware or how to achieve high energy efficiency).
From a practical perspective, the single-cell scenario is realistic when there is no or very little inter-cell interference. Suppose that you want to provide coverage to an indoor exhibition hall or outdoor concert at a stadium. Walls will provide a natural separation from the rest of the world. Single-cell analysis will then be appropriate.
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