MIMO for Next Generation Wireless Systems
A special issue of Electronics (ISSN 2079-9292). This special issue belongs to the section "Microwave and Wireless Communications".
Deadline for manuscript submissions: closed (30 November 2021) | Viewed by 5106
Special Issue Editor
Special Issue Information
Dear Colleagues,
With the market penetration of 5G in the 30 GHz band, massive digitally controllable antenna arrays will be deployed worldwide. This trend will be reinforced in beyond 5G systems, where base stations will have a co-location of several compact arrays covering different azimuthal sectors, with hundreds or thousands of antennas per site. Thus, new strategies for antenna deployment, such as extremely large aperture arrays (ELAA) or holographic massive MIMO (HmMIMO), are needed to deploy more than a few hundred antennas per site and to obtain a truly massive MIMO (mMIMO) spatial resolution beyond 5G.
Cell-free mMIMO and radio stripes are among the techniques based on ELAA. One key advantage over mMIMO with compact arrays lies in the wider higher area with high throughput achieved by these techniques. Capacity can even be boosted with the integration of a huge number of antennas in a limited surface aperture as in HmMIMO. However, more antennas implemented in a distributed way means storing and analyzing huge quantities of channel state information (CSI), which is needed to implement interference-rejecting precoding and in combining schemes. Another problem lies in the energy burden due to computational complexity and the front-haul capacity requirements when thousands of antennas share a common centralized processing unit. However, tight latency requirements could lead to solutions where processing is done in a distributed way using local digital baseband processing units located in a base station or user device. Since processing power is limited in such devices, new algorithms are needed to improve efficiency. To deal with increasingly complex optimization problems and the huge amount of traffic generated by these ultra-dense massive MIMO structures, new techniques and network protocols/algorithms are needed to ensure that very low latency requirements are met.
Accordingly, this Special Issue calls for recent advances related to massive MIMO technologies beyond 5G that cover signal processing, hardware and complexity optimization, traffic optimization management, distributed and centralized optimized processing architectures, security, and implementation aspects. Topics of interest in this Special Issue include, but are not limited to, the following:
- Transmitter and receiver techniques for mMIMO;
- Low energy/hardware complexity implementations (analog/digital mMIMO, 1 bit DAC/ADC, NL amplifiers, etc.);
- Channel estimation in mMIMO;
- mMIMO techniques for cell-free mMIMO systems;
- mMIMO for energy harvesting;
- mMIMO large intelligent surfaces, reconfigurable intelligent surfaces, intelligent reflexive surfaces, etc.;
- Radio stripes;
- Machine learning and efficient distributed processing architectures and optimized resource allocation schemes;
- Network and traffic optimization for ultra-dense mMIMO;
- Physical security in mMIMO;
- Proof-of-concept (PoC) and trials.
Prof. Dr. Paulo Montezuma
Guest Editor
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