Conference Paper

A Pilot Design Technique for Single-Carrier Transmission over Fast Fading Relay Channels

Dept. of Electron. & Electr. Eng., Pohang Univ. of Sci. & Technol., Pohang
DOI: 10.1109/GLOCOM.2008.ECP.903 Conference: Global Telecommunications Conference, 2008. IEEE GLOBECOM 2008. IEEE
Source: IEEE Xplore


Relay-assisted space-time block code (STBC) and space-frequency block code (SFBC) for single carrier frequency-domain equalization (SC-FDE) were presented. They achieve spatial diversity over fading relay channels under the assumption of perfect channel state information (CSI). In this paper, we propose a pilot position selection/detection technique for channel estimation of those systems. Unlike the conventional block-type channel estimation techniques, the proposed scheme superimposes pilots on data-carrying tones whose positions are selected to minimize the distortion of original signals. Without additional pilot overhead, the proposed technique can track the CSI even when the mobile equipment speed is high. The corresponding destination structure and frequency domain equalization are also presented, where the pilot positions are blindly detected and the distorted data symbols are iteratively reconstructed. Simulation results show that the proposed method gives better BER performance than the block-type channel estimation for the distributed SFBC (D-SFBC) SC-FDE over fast fading relay channels, without the loss of spectral efficiency.

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    • "In the proposed system, the effect of timing offset turns into a cyclic shift of the received signal, which corresponds to a phase rotation in the frequency domain. Phase rotated CFR is obtained by the channel estimation method [11], [12]. At the destination, removing the CP, the received signal is given by (11) where is a complex AWGN vector with each entry having a zero-mean and variance of per dimension. "
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    ABSTRACT: Peak-to-average power ratio (PAPR) regrowth after clipping is one disadvantage of space-frequency block coded orthogonal frequency-division multiplexing (SFBC-OFDM). In this letter, we propose an effective PAPR reduction technique of SFBC-OFDM for multinode cooperative transmission. To reduce PAPR at the source (mobile equipment), the relay applies SFBC encoding, which enables the source to transmit clipped single-input single-output (SISO)-OFDM signals without any increase of PAPR. Simulation results show that the clipped signals of proposed scheme are effectively recovered, and the proposed scheme achieves the diversity of SFBC without the complexity of multiple antennas at the source.
    Full-text · Article · Dec 2009 · IEEE Signal Processing Letters
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    • "In the simulations , we assumed perfect channel state information. Highly accurate channel estimation for SC-FDE systems can be done with a frequency-domain multiplexed pilot technique proposed in [10]. Fig. 4. Block error rate performance of STBC, H-BLAST, and proposed MIMO systems for different number of iterations (N = 2;N = 2;N = 256, QPSK, E =N = 6 dB, TU channel). "
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    ABSTRACT: This letter proposes a multiple-input multiple-output (MIMO) technique for single carrier frequency-domain equalization (SC-FDE). The proposed system achieves spatial multiplexing and transmit diversity gains altogether, thus improving error performance and increasing spectral efficiency compared to conventional spatial multiplexing and transmit diversity techniques, respectively. In order to achieve both of the gains, independent data streams are transmitted simultaneously through all transmit antennas with different cyclic delay patterns for each data stream. Corresponding receiver structure is also presented, where a successive interference cancellation (SIC) algorithm without ordering process is introduced. Simulation results show that the proposed system with iterative receiver structure provides considerable performance gains over conventional MIMO techniques.
    Full-text · Article · Aug 2009 · IEEE Signal Processing Letters
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    Full-text · Article · Jan 2009
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