Abstract
Partial transmit sequence (PTS) technique is considered as one of the efficient methods to reduce the high peak-to-average power ratio (PAPR) problem in 4G waveform design such as the orthogonal frequency division multiplexing (OFDM) systems. Filtered-OFDM (F-OFDM) is a new candidate in the 5G waveform development with maintaining a high level of commonality with legacy OFDM systems, but the high PAPR value is still a considerable problem because F-OFDM supports the orthogonal transmission. Although the PTS technique improves the PAPR reduction performance significantly, the high computational complexity level for optimizing the phases of the transmitting signal restricts this technique in practical applications. Therefore, the low computational complexity level of the PTS technique leads to the adoption of this technique for PAPR reduction in the multicarrier systems such as OFDM and F-OFDM. In this paper, a new low complexity algorithm (Gray-PF-PTS) by combining the Gray code and the left feedback shift register operation based on a specific mapping rule has been proposed. The numerical results indicate that the Gray-PF-PTS algorithm extensively reduces the computational complexity level without degradation the PAPR reduction performance compared with the conventional PTS method. Furthermore, the OFDM and F-OFDM systems based on the Gray-PF-PTS algorithm have been compared regarding the PAPR, bit error rate (BER), and power spectrum density (PSD) performances.
Highlights
As one of the most attractive techniques in high-data-rate communication, the orthogonal frequency division multiplexing (OFDM) systems are considered a popular waveform design for many wireless communication standards
The high peak-to-average-power ratio (PAPR) value of the transmitted signals is considered the major drawback of the OFDM system, which drives the OFDM signals to work in the nonlinear region of high-power amplifier (HPA) and this leads to appearing undesirable degradation in the Bit Error Rate (BER) performance [9]
It important to mention that the C-Partial transmit sequence (PTS) method is assumed based on a pseudo-random partitioning scheme, so as the conventional PTS is termed to PR-PTS in this simulation
Summary
As one of the most attractive techniques in high-data-rate communication, the orthogonal frequency division multiplexing (OFDM) systems are considered a popular waveform design for many wireless communication standards. Wang’s algorithm reduces the computational complexity better than C-PTS without degradation in the PAPR performance. It is clear that there is a tradeoff between the PAPR reduction performance and the computational complexity level in the PTS technique. A new phase weighting algorithm for PTS named Gray phase factor PTS (Gray-PF-PTS) has been proposed, which aims to reduce computational complexity and achieve almost the same performance in PAPR reduction compared to C-PTS based on {±1, ±j}. In the F-OFDM system, the filter length is allowed to exceed the cyclic prefix length to fulfill more flexibility for design and to achieve the better balance between the frequency and time localization [40]. The benefits promised by F-OFDM need properly designed filters
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