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Combining quasi-orthogonal space-time coding and antenna selection in mimo-systems.
| Content Provider | CiteSeerX |
|---|---|
| Author | Badic, Biljana Fuxjaeger, Paul Weinrichter, Hans |
| Abstract | We present a method to combine Quasi-Orthogonal Space-Time Codes (QSTBCs) for 4 transmit antennas with antenna selection [1] to achieve high diversity order with a simple decoding algorithm on uncorrelated and correlated multiple input/multiple output (MIMO) channels. Our selection rule minimizes the average Bit Error Ratio (BER) and improves the system diversity even if only a simple zero-forcing (ZF) receiver is used. We show that using the best antenna subset from more than 4 available transmit antennas we can substantially improve diversity and the coding gain of space-time code compared to the case when only 4 transmit antennas are used. We consider a nt × nr MIMO channel and assume quasi-static flat Rayleigh fading. The channel coefficients hi,j are modelled as complex zero mean Gaussian random variables with unit variance, i.e. hi,j ∼ N(0,1). We assume perfect channel knowledge at the receiver and partial channel knowledge at the transmitter provided by a low feedback rate. For transmission we use the QSTBC for nt = 4 and nr = 1 [2] where four symbols s1 to s4 are transmitted in four time slots: |
| File Format | |
| Access Restriction | Open |
| Subject Keyword | Antenna Selection Quasi-orthogonal Space-time Coding Transmit Antenna Quasi-orthogonal Space-time Code Correlated Multiple Input Multiple Output Simple Decoding Algorithm Channel Coefficient Hi Average Bit Error Ratio High Diversity Order Space-time Code Mean Gaussian Random Variable Selection Rule Quasi-static Flat Rayleigh Fading Time Slot Available Transmit Low Feedback Rate Simple Zero-forcing Unit Variance Perfect Channel Knowledge Nt Nr Mimo Channel System Diversity Antenna Subset Partial Channel Knowledge |
| Content Type | Text |
