Optimal Pilot Design and Error Rate Analysis of Block Transmission Systems in the Presence of Channel State Information (CSI) Estimation Error

This paper concentrates on the designing of a robust Tomlinson-Harashima Precoder (THP) over multiple-input multiple-output (MIMO) channels in wireless communication systems with assumption of imperfect channel state information (CSI) at the transmitter side. With the assumption that the covariance matrix of channel estimation error is available at the transmitter side, we design a THP that presents robustness against channel uncertainties. In the proposed robust THP, the transmit power is further minimized by using the Tilted constellation concept. This power minimization reduces the interchannel Interference (ICI) between subchannels and, furthermore, recovers some part of the THP's power loss. The bit error rate (BER) of the proposed system is further improved by using a power loading technique. Finally, the simulation results compare the performance of our proposed robust THP with a conventional MIMO-THP.

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Optimization of a MIMO amplify-and- forward relay system with channel state information estimation error and feedback delay

EURASIP Journal on Advances in Signal Processing ◽

10.1186/s13634-016-0400-9 ◽

2016 ◽

Vol 2016 (1) ◽

Cited By ~ 3

Author(s):

Ying Zhang ◽

Danni Zhao ◽

Huapeng Zhao ◽

Yinjiang Chen ◽

Ning Kang

Keyword(s):

Channel State Information ◽

Estimation Error ◽

Feedback Delay ◽

Amplify And Forward ◽

Channel State ◽

Relay System ◽

State Information

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Effect of Channel Estimation Error on Coordinated Small-Cells with Block Diagonalization

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.556-562.4501 ◽

2014 ◽

Vol 556-562 ◽

pp. 4501-4504

Author(s):

Soo Young Shin ◽

Toha Ardi Nugraha

Keyword(s):

Channel Estimation ◽

Channel State Information ◽

Cooperative Communication ◽

Estimation Error ◽

Small Cells ◽

Block Diagonalization ◽

Channel State ◽

State Information ◽

The Real ◽

Perfect Channel

This paper investigates the implementation of cooperative communication in small-cells network. Cooperative communication is some cells that in a network can work together, ex. joint transmit power and exchange resource allocation among them. Therefore, cooperative small-cells can be possible to add more multiple input multiple output (MIMO) antennas. But, channel state information (CSI) is required. In practice, perfect channel state information may not be perfect due to the real condition of the real environment such as delay, error, and etc. This paper illustrates cooperative small-cells under error model on the channel estimation. Our propose system is combined by implementing block diagonalization pre-coding and power allocation based on water-filling algorithm. As investigated by simulation results, our proposed coordinated small-cells showed good performances compare to previous algorithm either with perfect channel or with the error channel estimation.

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