Abstract
Space-time differential coding (STDC) is an effective technique for exploiting transmitter diversity while it does not require the channel state information at the receiver. However, like conventional differential modulation schemes, it exhibits an error floor in fading channels. In this paper, we develop an STDC decoding technique based on multiple-symbol detection and decision-feedback, which makes use of the second-order statistic of the fading processes and has a very low computational complexity. This decoding method can significantly lower the error floor of the conventional STDC decoding algorithm, especially in fast fading channels. The application of the proposed multiple-symbol decision-feedback STDC decoding technique in orthogonal frequency-division multiplexing (OFDM) system is also discussed.
Highlights
Space-time coding (STC) methodologies, which integrate the techniques of antenna array spatial diversity and channel coding, can provide significant capacity gains in wireless channels
The multiple-symbol decision-feedback STDC decoding algorithm developed in this paper is a generalization of this technique to systems employing multiple transmit antennas and space-time differential coding
We briefly discuss the application of decision-feedback space-time differential decoding in orthogonal frequency-division multiplexing (OFDM) systems
Summary
Space-time coding (STC) methodologies, which integrate the techniques of antenna array spatial diversity and channel coding, can provide significant capacity gains in wireless channels. We develop a multiplesymbol decision-feedback decoding technique for decoding STDC in fading channels, which considerably reduces the error floor, especially in fast fading channels. For systems with single transmit antenna, it is known that multiple-symbol differential detection [9, 10, 11, 12] can eliminate the error floor in fading channels at the expense of increased receiver complexity. The multiple-symbol decision-feedback STDC decoding algorithm developed in this paper is a generalization of this technique to systems employing multiple transmit antennas and space-time differential coding. We will address the application of STDC in OFDM systems and the corresponding multiple-symbol decision-feedback differential receiver.
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