The paper analyzes and compares the performance of some space-time codes applied to the forward link of a WCDMA multi-satellite UMTS environment. Space-time trellis codes (STTrC) have been considered as a first comparison with already implemented transmit diversity schemes, such as maximal ratio combining (MRC), space-time block codes (STBC) and selection transmit diversity (STD). Furthermore, in order to improve their performance, convolutional codes (CC) have been added as outer encoders to MRC, STBC and STD, while for STTrC, a CC plus iterative decoding has been considered in order to perform space-time turbo coded modulation (STTuCM). All these schemes have been implemented in a multi-satellite environment. An intra- and inter-cell interference model is presented in order to evaluate the performance of these schemes for a loaded system. The effect of a feedback delay and errors in channel state identification have been introduced in order to have a real behavior of closed-loop schemes.
SPACE-TIME MMSE TRANSMIT DIVERSITY IN MULTI-SATELLITE SYSTEMS / L. MUCCHI; T. PALANDRI; E. DEL RE; R. FANTACCI. - STAMPA. - 2:(2003), pp. 1-5. (Intervento presentato al convegno IASTED International Conference on Wireless and Optical Communications tenutosi a BANFF - CANADA nel 14-16 JULY 2003).
SPACE-TIME MMSE TRANSMIT DIVERSITY IN MULTI-SATELLITE SYSTEMS
MUCCHI, LORENZO
;DEL RE, ENRICO;FANTACCI, ROMANO
2003
Abstract
The paper analyzes and compares the performance of some space-time codes applied to the forward link of a WCDMA multi-satellite UMTS environment. Space-time trellis codes (STTrC) have been considered as a first comparison with already implemented transmit diversity schemes, such as maximal ratio combining (MRC), space-time block codes (STBC) and selection transmit diversity (STD). Furthermore, in order to improve their performance, convolutional codes (CC) have been added as outer encoders to MRC, STBC and STD, while for STTrC, a CC plus iterative decoding has been considered in order to perform space-time turbo coded modulation (STTuCM). All these schemes have been implemented in a multi-satellite environment. An intra- and inter-cell interference model is presented in order to evaluate the performance of these schemes for a loaded system. The effect of a feedback delay and errors in channel state identification have been introduced in order to have a real behavior of closed-loop schemes.
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