Fifth generation of mobile communication networks will support a large set of new services and applications. One important use case is the remote area coverage for broadband Internet access. This use case has significant social and economical impact, since a considerable percentage of the global population living in low populated area does not have Internet access and the communication infrastructure in rural areas can be used to improve agrobusiness productivity. The aim of this paper is to analyze the performance of a 5G for Remote Areas transceiver, implemented on field programmable gate array based hardware for real-time processing. This transceiver employs the latest digital communication techniques, such as generalized frequency division multiplexing waveform combined with 2 by 2 multipleinput multiple-output diversity scheme and polar channel coding. The performance of the prototype is evaluated regarding its outof-band emissions and bit error rate under AWGN channel.
No abstract
Resumo-Maior conectividade e interatividade são os anseios da próxima geração de transmissão digital da indústria de radiodifusão. Além disso, com a redução do espectro das emissoras de TV, concedido para as operadoras celulares, se torna necessário o uso eficiente do espectro na faixa de UHF e uma nova padronização se faz necessária. O ATSCé o padrão de TV utilizado em vários países há mais de 20 anos, dada suas limitações, um novo padrão foi proposto para suprir a necessidade de uma maior interação entre emissoras e usuários, com maior conectividade, qualidade deáudio, vídeo em alta resolução e uma maior flexibilidade para atender usuários fixos e móveis. Vistos estes novos desafios, neste trabalho, a camada física do ATSC 3.0 para o sistema de transmissãoé simulada utilizando o ambiente de simulação MATLAB R , com objetivo de explorar a funcionalidade de cada bloco proposto, assim como servir de referência para implementação e posterior validação do sistema em hardware. Com o intuito de aferir a plataforma de simulação desenvolvida, a mesma foi validada de acordo com vetores de teste compatíveis com a norma existente, fornecidos por um modulador comercial padrão, garantindo a interoperabilidade do sistema.
The foreseen scale of connected autonomous and low power consumption devices in the near future is a challenging aspect for the next generation of mobile communication networks. As the number of available connection resources is limited, frequency‐time multiplexing may not be sufficient to meet the expected demand for capacity, where scheduling solutions might incur in undesired latency levels and also increase the power expenditure to meet a more stringent synchronisation. In this scenario, spatial multiplexing based on multi‐user multiple‐input multiple‐output can extend the uplink capacity at the cost of inter‐antenna interference at the base station, requiring more complex detection schemes. The sphere detector can mitigate the inter‐antenna interference, achieving close‐to‐optimum bit error rate performance with average polynomial complexity that still challenges the field programmable gate array implementation in terms of resources and area. To further reduce the sphere detector complexity, the authors introduce the concept of affine transform modulation, which allows us to describe the received signal in terms of the sequence of transmitted bits per symbol. The authors demonstrate that this approach allows to evaluate the Euclidean distance in the sphere detector algorithm in terms of the transmitted bits, replacing the complex inner product by a complex accumulator in its extensively accessed core function. The approach proposed in this paper leads to a considerable complexity reduction in terms of FLOPs for low‐order modulations while attaining the conventional sphere detector performance.
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