Joint Sequence Design for Robust Channel Estimation and PAPR Reduction for MIMO-OFDM Systems

Abstract

A joint superimposed sequence design, known as SuperImposed sequence for PAPR Reduction, or SIPR, using per-tone affine precoding technique is proposed to jointly estimate MIMO-OFDM channels and reduce the peak-to-average power ratio (PAPR) for MIMO-OFDM systems. The proposed technique optimizes the trade-off between BER, MSE of the channel estimate, and PAPR reduction performance. Moreover, it does not require side information to be transmitted for the removal of the sequence at the receiver, and the transmit redundancy can be as small as 1 symbol/subcarrier. The superimposed sequence is designed by solving a convex quadratically constrained quadratic programming problem and has a computational complexity comparable to previous technique using linear programming. It is shown that SIPR can be regarded as a generalization of the popular tone reservation (TR) technique, and thus, is able to outperform TR in terms PAPR reduction performance, with less transmit overhead. Simulation results and transmit redundancy analysis of SIPR and TR are shown to illustrate the efficacy of the proposed scheme.

An Efficient Selection Method of a Transmitted OFDM Signal Sequence for Various SLM Schemes

“…x(1) can be generated by computing the seven 'dashed pentagon' nodes. Clearly, x(5), x (3), and x(7) are generated, similar to the case of x(4), x (2), and x (6). Generally, in an N-point IFFT, the OFDM signal components…”

“…Clearly, x(0) is generated by computing the seven 'dashed circle' nodes. Then x(4) is generated by additionally computing only one more 'dashed square' node, and then x(2) is generated by computing three more 'dashed triangle' nodes, and then x (6) is generated by computing one more 'dashed star' node.…”

“…Over the last few decades, various schemes to reduce the PAPR of OFDM signal sequences have been proposed such as clipping [3], [4], coding [5], [6], active constella- † † The author is with Samsung Electronics, Hwasung, Korea. † † † The author is with the Department of Electronic Engineering, Hanyang University, Seoul, 133-791, Korea.…”