Abstract
The high peak-to-average (PAPR) is one of the serious problems in the application of OFDM technology. The com-panding transform approach is a very attractive technique to reduce PAPR, but large PAPR reduction leads to a high bit error rate (BER) by the available companding transform techniques. In this paper, a joint reduction in PAPR of the OFDM signals based on combining the discrete cosine transform (DCT) with companding is proposed. In the first step of the proposed scheme, the data are transformed by a DCT into new modified data. In the second step, the proposed scheme utilizes the companding technique to further reduce the PAPR of the OFDM signal. The performance of the PAPR is evaluated using a computer simulation. The simulation results indicate that the proposed scheme may obtain about 1 dB PAPR reduction compared with the conventional companding algorithm.
Highlights
OFDM is a promising technique that is able to provide high data rates over multipath fading channels
We present the results of computer simulations used to evaluate peak-toaverage power ratio (PAPR) reduction capability and bit error rate (BER) of the proposed scheme
We can evaluate the performance of the PAPR reduction scheme using the complementary cumulative distribution (CCDF) of the PAPR of the OFDM signal
Summary
OFDM (orthogonal-frequency-division multiplexing) is a promising technique that is able to provide high data rates over multipath fading channels. To reduce the PAPR, many techniques have been proposed, such as clipping, coding, partial transmit sequence (PTS), selected mapping (SLM) [1,2,3], nonlinear companding transforms [4,5], and Hadamard transforms [6]. These schemes are primarily signal scrambling techniques, such as PTS, and signal distortion techniques such as the clipping and companding techniques. Companding algorithm is applied further to reduce the PAPR of the OFDM signal after the IFFT operation This scheme will be compared with the original system with companding technique for reduction PAPR.
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