Mojtaba Mahdavi treats need for speed and reliability with hardware friendly algorithms
New applications set new demands on the data-rate, reliability, and latency of wireless communication systems in 5G and beyond, pushing forward technology developments. The thesis work of Mojtaba Mahdavi has been oriented towards the domain of...
New applications set new demands on the data-rate, reliability, and latency of wireless communication systems in 5G and beyond, pushing forward technology developments. The thesis work of Mojtaba Mahdavi has been oriented towards the domain of hardware-efficient realisation of components in the baseband. The focus has been on the design and implementation of the OFDM* demodulator, massive MIMO detector, and channel decoder. September 24 at 9.15 he defends his PhD thesis ?Baseband Processing for 5G and Beyond: Algorithms, VLSI Architectures, and Co-design? at LTH, Lund University. Read more about the dissertation. Download the thesis (PDF) Applications such as remote surgery and self-driving cars have great demands on the reliability and latency since any failure in such cases would result in a disaster. In these applications, the data transmission should be performed in less than 5 ms with a success rate of 99.999%. Other applications like video streaming and augmented reality rely upon fast and high-volume data transmission. Massive connectivity is another demand, which is required in smart cities and smart homes such that more than 100,000 devices per km2 should be able to communicate.
?I did my master thesis in the field of baseband processing for 4G wireless systems in the Sharif University of Technology in Teheran. I found the interdisciplinary research of wireless communication and digital hardware design very interesting, and I wanted to learn more about this field. Thus, I decided to pursue PhD studies at the Department for Electrical and Information Technology at Lund University, which has been one of the main pioneers and contributors in the development of 5G systems.? What is the most fascinating or interesting with your thesis subject?
?One of the most fascinating aspects of my thesis work is the realisation of very complex algorithms and mathematical equations in the real hardware using simple circuits. It is interesting to investigate how the system-level features can be utilised to make these algorithms more hardware friendly and develop efficient hardware architectures to perform complicated processing.? What will happen with the findings?
?An important outcome of my research is to demonstrate how system, algorithm, and architecture levels can be co-optimised to improve the efficiency of the final design. This approach can be employed to design and implement the baseband processor for the current and upcoming wireless communication systems in a more efficient way. In this thesis, we have used this design approach for the key functional blocks in the baseband processing of 5G systems and presented that the hardware cost, latency, reliability, and data rate are significantly improved.? ------------- * OFDM: Orthogonal frequency-division multiplexing. Get an overview at Wikipedia.org.
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Why are you doing a PhD ? and why Lund?¬?I looked for local opportunities in Lund and started to study engineering physics. Over the years, I got increasingly motivated by the subject and being offered a doctoral studentship felt like proof that I had actually performed well. When I met Lars-Erik [Wernersson] and heard about how successful his former students were, it became even more obvious that I should pursue a doctoral degree. The mixture of lab work and theoretical study was also an attraction.?
Competing against giantsAdam explains that it is becoming increasingly expensive to develop and produce electronic components such as transistors on the nano scale. This in turn has entailed the consolidation of a large part of commercial production to a few stakeholders operating on a global level. ?So there are only a few producers in the world, such as Samsung, Intel, GlobalFoundries, that produce pretty much all components. And in that context, I am proud that we, in Lund, can compete against these giants and actually beat them when it comes to certain performance indicators.?
What will happen to your research findings??I like to say that research is successful if its findings are used. I have tried to write my doctoral thesis in such a way as to inspire other doctoral students in similar subjects to continue the work in the same spirit. When it comes to commercialisation, the hurdle is a little higher. But it is possible that the technology could end up in processors or high frequency amplifiers within ten years or so. For memory circuits, a lot of commercialisation is already underway in the form of Static Random-Access-Memory (SRAM).?
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