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Microwave Basics

după Brock Spencer

Pitch

după Jess Staveley

My favorite things in life.

după nicolas suarez

CHAPTER 1: Elements of Interpersonal Communication

după Fakhirah Kamarudin

Inteelligesurfaces

Metamaterla surfaces software controlled

Low phase noise local oscilator

Ongoing research

https://sci-hub.hkvisa.net/10.1038/s41566-021-00790-2

Phase noise resistant modulation

NOMA

Power domain NOMA has recently been excluded from the 3GPP standard because of many problems related to its low performance compared to other competitive methods, receiver complexity, security vulnerability, and signaling overhead. To address these problems, we have developed new types of NOMA that can be found in this paper https://rs-ojict.pubpub.org/pub/tphonik9/

In downlink NOMA, a user doesn’t need to know the channel of anyone else since all signals reach the user over the same channel. However, the user must know the modulation and coding scheme of the co-users.

Fucked up with mimo. The way noma is interesting in mimo situation is when we have multiple users at the same time in the Line of sight of the antenna. In this case, the multiple antennas acts like a single one and NOMA can be better in this case

Main examples are for 2 or 4 users

Main use is power domain NOMA

6g

The World's Oceans

• 71% of the Earth's surface is covered by water
• The oceans contain 97% of the earth's water
• All oceans and seas are actually one continuous body of water
• Oceanographers are scientist who study the ocean and its processes.

Need to manage a lot of device peper m2

Needs for Small transfer with massive number of users

Massive mimo, spacial multiplexing

New modulation schemes

SDMA

SDMA based on MU–LP

Although MU–LP is suboptimal for the multi-antenna BC, it achieves a near-capacity performance when CSIT is perfect and the user channels are nearly orthogonal with similar channel strengths or similar long-term signal-to-noise ratios (SNRs) [8]. SDMA based on MU–LP1 is therefore an integral part of numerous 4G and 5G transmission schemes such as multi-user MIMO (MU–MIMO), networked MIMO, coordinated multi-point (CoMP), massive MIMO, and millimeterwave (mmWave) MIMO. Linear precoding schemes, such as zero-forcing beamforming (ZFBF) [8], minimum mean square error (MMSE), regularized ZFBF (R-ZF) [6], block 1 In the rest of the paper, for simplicity, we use “SDMA” when we want to refer to “SDMA based on MU–LP”. 4 diagonalization (BD) [9], maximum ratio transmission (MRT) [10], and maximum signal-to-leakage-and-noise ratio (SLNR) transmission [11] have been extensively used in practical

https://arxiv.org/pdf/2201.03192.pdf

Rate multiplexing ?/RSMA?

https://sci-hub.hkvisa.net/10.1109/vtc2020-fall49728.2020.9348672

good results in papers

Seems to be lobbied ?

FBMC

Energy Transfer and Harvesting

Very lowpower communications is especially required in Internet-ofThings (IoT) nodes with non-replaceable batteries

Need for higher bandwidth

mmWaves

300ghz

Phase noise

lower reach of the waves and more distance related issues

More dense network

multiple antennas beamforming

Needs for high precision positionning

hybrid beamforming

How to detect position of users

Use of ai?

Channel estimation?

track user movement

Use of multi antennas ?

for backhaul routing