A PAPR reduction scheme of OFDM system using a selected partial companding technique for logging signals

Abstract

Due to the restrictions on the size of instruments and temperature of working environment, the transmission scheme of the well logging systems must be simple. Most of the latest well logging systems have adopted the orthogonal frequency division multiplexing (OFDM) as the modulation and demodulation scheme. To reduce the peak-to-average-power ratio of OFDM, we propose a selected partial companding method based tone reservation in this paper. According to the feature of logging data, firstly we concentrate the signals that have large power into a range in time label with tone reservation method. Then, the signals would be compressed in the transmitter side, and the inverse transformation expansion would be performed in the receiver side. In this paper, we also propose a method to get the optimal companding coefficient. We have also simulated the scheme with Matlab. The result shows that the method is simple but effective for well logging data.

Keywords:

• OFDM
• PAPR
• companding
• TR
• well logging

Funding

This work was supported by Major Projects of Oil and Gas of Chinese 12th 5-year National Science Technology Planning [grant number 2009ZX05009-005].

Disclosure statement

No potential conflict of interest was reported by the authors.