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On Coordinated Multi-Point Transmission for Cellular Environments

Current and emergent services are demanding higher data rates, improved spectral e±ciency and increased network capacity. To face these new requirements, it is important to ¯nd schemes able to reduce the e®ects of fading and to exploit new types of diversity. Coordinated Multi-Point transmission (CoMP) comprises the coordinated transmission of signals from adjacent base stations (BS), and the corresponding rece...

Receptor no Domínio da Frequência para Modulações SC-FDE com STBC

São apresentados métodos para suportar transmissões baseadas na técnica de Transmissão com Portadora Única, com Igualação no Domínio da Frequência (SC-FDE), utilizando diversidade de transmissão, com codificação no espaço e no tempo. O objectivo do sistema proposto consiste em permitir a difusão de informação a partir de terminais de comunicações móveis, conseguindo-se uma melhor eficiência de desempenho e/ou d...

Transmission Techniques for 4G Systems

Fourth Generation wireless communication systems (4G) aim to allow peak data rates in the range of 1 Gbps for nomadic access and 100 Mbps for vehicular mobility. 4G aim to support current and emergent multimedia services, such as mobile TV, social networks and gaming, high definition television and video teleconference, multimedia messaging service, using the all over IP concept and with improved quality of ser...

Transmission Techniques for Emergent Multicast and Broadcast Systems

Multimedia Broadcast and Multicast Service (MBMS) as video broadcast or mobile television is intended to use spectrum-efficient multimedia services, by transmitting data over a common radio channel, where the bottleneck is placed to a large group of users. This book proposes and studies several advances in transmission techniques and receivers to support emergent wireless needs for MBMS requirements. These new...

Frequency-Domain Receivers for Rate-1 Space-Time Block Codes

This paper considers iterative frequency-domain receivers for block transmission techniques with rate-1 Space Time Block Coding (STBC) for two and four transmit antennas using both Orthogonal Frequency Division Multiplexing (OFDM) and Single-Carrier (SC) schemes. The proposed receiver includes an interference canceller which enhances the performance of the non-orthogonal STBC scheme with 4 transmit antennas, a...

On transmission techniques for multi-antenna W-CDMA systems

In this paper we present and evaluate a new pre-processing scheme for Multiple Input Multiple Output (MIMO) channels. Its performance is compared with other MIMO schemes proposed for the downlink of Wideband-Code Division Multiple Access (W-CDMA) systems, namely a variation of the Beam Forming (BF), entitled Beam-Selective Transmit Diversity (BSTD) or post-processing schemes, such as the Alamouti-like MIMO or t...

Interference Suppression Consisting of Pre-Distortion Filtering and Selective T...

In this paper we present and evaluate a pre-distortion (PD) scheme for the downlink of Wideband-code division multiple access (W-CDMA) systems considering a Rake in the receiver in order to exploit multipath diversity. Its performance is compared with schemes without the PD at the base station (BS), and combined with a transmit diversity (TD) scheme to improve the performance by exploiting spatial diversity. It...

Relatório quinquenal (2000-2005)

Joint multi-user detection and intersymbol interference cancellation for WCDMA ...

In this work we present two different intersymbol interference (ISI) cancellation systems, namely the commutation signaling (CS) and orthogonal code-division transmit diversity (O-CDTD) in combination with satellite path diversity, which leads to a high diversity order. The ISI is due to the use of satellite path diversity (in order to introduce multipath diversity artificially). This work combines the proposed...