| Paper: | SPCOM-L5.6 | ||
| Session: | Space-Time Coding | ||
| Time: | Thursday, May 20, 17:10 - 17:30 | ||
| Presentation: | Lecture | ||
| Topic: | Signal Processing for Communications: Space-Time Coding and Transmit Diversity | ||
| Title: | OPTIMAL SWITCHING THRESHOLDS FOR SPACE-TIME BLOCK CODED RATE-ADAPTIVE M-QAM | ||
| Authors: | Youngwook Ko; Arizona State University | ||
| Cihan Tepedelenlioğlu; Arizona State University | |||
| Abstract: | Channel state information (CSI) at the transmitter can be used toadapt transmission rate or antenna gains to time-varying fadingchannels in multi-antenna systems. However, the CSI that is fed backwill get outdated if the channel is changing rapidly. We havedeveloped a rate-adaptive M-QAM technique equipped with space-timeblock coding for multi-input multi-output (MIMO) systems andimperfect signal to noise ratio (SNR) feedback as opposed to the morecomplex full channel feedback in [6]. Based on theclosed-form expressions for the average BER and average throughputderived in [6], we deriveherein an optimal switching thresholds which maximize the averagethroughput under average BER constraint for MIMO fadingchannels. Our numerical results illustrate the immunity of our optimalthresholds to error due to time-delayed feedback. | ||
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