Abstract
Precoding techniques can be used in multiple input multiple output (MIMO) system to assign resources such as power and information optimally. This paper is concerned with limited feedback in precoded orthogonal space time block code (OSTBC) systems, which is a precoding technique for incomplete channel information response. The conventional approach to design the precoding codebook is based on the discrete Fourier transform (DFT) matrix, which has high computational complexity. In this paper, a new approach to design the precoding codebook for the limited feedback precoded OSTBC systems is proposed, which is based on the discrete fractional sine transform (DFRST) matrix. The proposed DFRST-based precoding codebook design approach has lower computational complexity comparing to that of the DFT-based design with very similar bit error rate (BER) performance.
Highlights
Multiple input multiple output (MIMO) systems are widely used in many practical wireless communications system [1–4]
MIMO systems with precoding for orthogonal STBC (OSTBC) by using limited feedback was proposed in [6] and investigated in [7–10]. This precoding technique for the MIMO system can improve the system performance significantly by using the channel state information (CSI) [11–14] at the transmitter. This system model with limited feedback studied by Love and Heath in [7] has been adopted in many communication systems, such as the Long Term Evolution (LTE) [1–4] and spatial modulation [15, 16]
3 Codebook design approach based on discrete fractional sine transform (DFRST) we propose a new approach to design the precoding codebook P based on the DFRST matrix
Summary
Multiple input multiple output (MIMO) systems are widely used in many practical wireless communications system [1–4]. MIMO systems with precoding for orthogonal STBC (OSTBC) by using limited feedback was proposed in [6] and investigated in [7–10] This precoding technique for the MIMO system can improve the system performance significantly by using the channel state information (CSI) [11–14] at the transmitter. This system model with limited feedback studied by Love and Heath in [7] has been adopted in many communication systems, such as the Long Term Evolution (LTE) [1–4] and spatial modulation [15, 16]. We. Hai et al EURASIP Journal on Wireless Communications and Networking (2017) 2017:103 show that the DFRST-based codebook design approach has lower computational complexity than that of the conventional approach without bit error rate (BER) performance loss. This DFRST matrix will be used in the proposed design approach which has lower computational complexity compared to the conventional approach
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