Encontrados 6 documentos, a visualizar página 1 de 1
New robust iterative minimum mean squared error-based interference alignment al...
Teodoro, Sara; Silva, Adão; Castanheira, Daniel; Dinis, Rui; Gameiro, AtílioInterference alignment (IA) is a promising technique for multiple input multiple output interference channels based systems, achieving the theoretical bound on degrees of freedom. However, these gains are reduced in the presence of imperfect channel state informa- tion (CSI), because of quantisation or channel estimation errors. In this Letter, the authors propose a new robust iterative IA minimum mean squared ...
Set optimization for efficient interference alignment in heterogeneous networks
Castanheira, Daniel; Silva, Adão; Gameiro, AtílioTo increase capacity and offload traffic from the current macro-cell cellular system operators are considering the deployment of small-cells. It is expected that both the small and macro-cells will coexist in the same spectrum resulting in unsustainable levels of interference. Interference alignment is considered as an effective method to deal with such interfer- ence. By using interference alignment the small-...
Robust leakage-based distributed precoder for cooperative multicell systems
Castanheira, Daniel; Silva, Adão; Gameiro, AtílioCoordinated multipoint (CoMP) from long term evolution (LTE)-advanced is a promising technique to enhance the system spectral efficiency. Among the CoMP techniques, joint transmission has high communication requirements, because of the data sharing phase through the backhaul network, and coordinated scheduling and beamforming reduces the backhaul requirements, since no data sharing is necessary. Most of the ava...
Minimum Codebook Size to achieve Maximal Diversity Order for RVQ based MIMO Sys...
Castanheira, Daniel; Silva, Adão; Gameiro, AtílioMultiple antenna systems provide both capacity and diversity gains relatively to single antenna based networks. These gains rely heavily on the availability of channel state information. In this manuscript we assume that the receiver has accurate channel information, which is quantized and fed back to the transmitter. Sufficient conditions for the feedback rate are provided that guarantee no loss of diversity d...
A novel distributed power allocation scheme for coordinated multicell systems
Silva, Adão; Holakouei, Reza; Castanheira, Daniel; Gameiro, Atílio; Dinis, RuiCoordination between base stations (BSs) is a promising solution for cellular wireless systems to mitigate intercell interference, improving system fairness, and increasing capacity in the years to come. The aim of this manuscript is to propose a new distributed power allocation scheme for the downlink of distributed precoded multicell MISO-OFDM systems. By treating the multicell system as a superposition of si...
Interference cancellation for distributed wireless systems
Castanheira, Daniel Filipe MarquesO tema principal desta tese é o problema de cancelamento de interferência para sistemas multi-utilizador, com antenas distribuídas. Como tal, ao iniciar, uma visão geral das principais propriedades de um sistema de antenas distribuídas é apresentada. Esta descrição inclui o estudo analítico do impacto da ligação, dos utilizadores do sistema, a mais antenas distribuídas. Durante essa análise é demonstrado que a ...
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