Abstract
This work explores the performances of Space-Time and Space Frequency Coded Orthogonal Frequency Division Multiplexing (OFDM) with simple two branches transmit diversity scheme. The combination of multiple-antenna and orthogonal frequency division multiplexing (OFDM) provides reliable communications over frequency selective fading channels. We focus on the application of space-time block codes (STBC) and space-frequency block codes (SFBC) in OFDM systems over time-varying and frequency-selective channels. SFBC transmitter shows superior performance in fast varying channels while STBC shows better performance in frequency selective channels. A switching technique is presented that selects an appropriate transmission scheme between the STBC and SFBC assuming Rayleigh fading model.
Highlights
Future Wireless communication systems have to be designed to integrate high data rates and high quality of service and multimedia wireless communications
We focus on the application of space-time block codes (STBC) and space-frequency block codes (SFBC) in Orthogonal Frequency Division Multiplexing (OFDM) systems over time-varying and frequency-selective channels
An effective way of providing diversity is through STBC; usually multiple transmissions are done over the two dimensions of space and time, STBC system assume that the channel is constant over time for the whole duration of the STBC block, as the performance is degraded if the channel is varying over successive time slots
Summary
Future Wireless communication systems have to be designed to integrate high data rates and high quality of service and multimedia wireless communications. In Space Diversity scheme, Space-Time Block Coding (STBC) and Maximal Ratio Combining (MRC) can be used to exploit the maximum spatial diversity available in the channel [1]. A simple receiver, with a linear combiner and a single antenna, can extract an order of diversity equal to 2 if the assumption of constant channel over two time slots is met. The combination of Multiple Input Multiple Output (MIMO) with Orthogonal Frequency Division Multiplexing (OFDM) has gained significant interest and is considered as one of the most promising techniques for present and future wireless communication systems [4]. This paper is focused on the analysis of the performances of Space-Time and Space Frequency Coded MIMOOFDM with simple two branches transmit diversity scheme over time frequency selective channels.
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