Space-Time Coded OFDM for High Data rate Wireless Communication over Wideband Channels
نویسندگان
چکیده
Assume a STC (space-time codes) OFDM (orthogonal frequency-division multiplexing) scheme the receiver antennas and multiple transmitters on compared time-chosen fading channels and frequency. It has been displayed that the time-selectivity product array is the input parameter to describe the associated fading channel outage capacity. It is considered that space-time codes with huge efficient extents and perfect fixed inter-leaver are very in abusing the natural variety in multipleantenna associated fading channels. The recommend a LDPC (low-density party-check) STC-OFDM of code based scheme. Evaluated with the usual STTC (space-time trellis code), Base on the LDPC significantly increases STC the performance of the system by abusing diversity of selective fading and spatial diversity in wireless channel. Evaluated with the current offered STC system of turbo-code-based based on LDPC STC displays complexity of lower receiver and very flexible extendibility. Propose receiver plan for STC-OFDM of based on LDPC schemes in unidentified fast fading channels and offer a receiver of novel turbo using demodulator of MAP-EM (maximum a posteriori expectation-maximization) and soft decoder LDPC that will extensively decrease the error level in fast fading channels by the complexity of modest computation. With that turbo receiver, the offered STC-OFDM of LDPC-based scheme is a assuring result to more capable data transmission on the wireless channels of selective fading mobile. Key words– OFDM (Orthogonal frequency-division multiplexing),STC (space-time codes),STTC(space-time trellis code) ________________________________________________________________________________________________________
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