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In this paper, a new companding transform for reduction in peak to average power ratio of OFDM signals is proposed. Linearity and existence of inflection points, which are key features of two previous works, are maintained in the proposed transform. However, unlike the previous works, the proposed transform does not cause abrupt jumps in the signal, hence leads to better spectral characteristics....
OFDM (orthogonal frequency division multiplexing) is an attractive technique for wireless high-bit-rate transmission due to the minimizing effects of frequency-selective fading and its high bandwidth efficiency. But OFDM has the high peak-to-average power ratio. In order to enhance the quality of transmission, there are many methods of reducing the PAPR value of OFDM system. The most recently, method...
In the IEEE802.11a WLAN standard, orthogonal frequency division multiplexing (OFDM) modulation is employed. Diversity techniques are usually utilized to overcome fading channels in OFDM systems. Furthermore, a diversity technique with one antenna is desirable because the form factor of the terminal is important. Fractional sampling (FS) scheme is one of the diversity techniques with a single antenna...
Orthogonal frequency division multiplexing (OFDM) has been proposed for use in ultra-wideband (UWB) communication systems. In a UWB-OFDM transceiver, resource efficient FFT/IFFT hardware is a necessity due to minimal silicon area and low power requirements. Resource requirements can be reduced by using finite precision arithmetic in the FFT/IFFT algorithms. However, this introduces round-off and overflow...
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