the technical constraints in estimating the channel state and keeping in mind the wide spectrum gap between 3.5GHz band and the unlicensed 60GHz band, would the idea be unrealistic?
have a look at our recent paper. You'll get your answer.
Conference Paper Analysis of the Cell Association for Decoupled Wireless Acce...
Dear Bethelhem,
welcome,
The answer of your question needs a thesis. However, one can give some pros and contras for using double bands, the microwave frequency 3.5 GHz band and the 60 GHz mmwave band.
The props are:
- The up link and down link communication data rate is unsymmetrical. In the sense that one needs much higher down load speed than up load speed.
- The power of the base station can be much higher than the user equipment as it is fixed and the user terminal is mobile. It is so that the mmwave may need much higher power to travel the same distance than the microwave frequency as the it has much higher transmission losses. However, one can use larger antenna size.
- The interference between the up link and down link will be very small since the two bands are far separated from each other
The contras are:
- More complex communication transceivers since they will operate on two separate band
- The electronics of the mmwave are still under development and not mature as at the microwave frequencies
- In case of mimo it is advantageous for channel estimation to work in half duplex mode where the transmitter and receiver operates on the same frequency. This reduces the burden of the channel estimation which is very necessary for successful communication.
There may be other pros and contras that other colleagues may add.
Best wishes
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