Abstract
A three-dimensional (3D) orthogonal frequency division multiplexing (OFDM) system with peak-to-average power ratio (PAPR) reduction method for the wireless sensor networks (WSNs) is presented. The transmit power of wireless nodes in an ad hoc network is strictly limited. Thus, high PAPR of the 3D OFDM system is a possible drawback when it is considered as a physical layer transmission scheme for the WSNs. Here, we propose an improved partial transmit sequence (PTS) technique to reduce PAPR of the OFDM system with 3D modulation formats. In the proposed algorithm, the components of 3D signals are assigned to different subblocks using a diagonal rule (DR), increasing randomness of the signals in the disjoint subblocks forcibly. As a result, the proposed method reduces PAPR of the 3D OFDM system significantly without increase in computational complexity. Hence, the proposed algorithm makes the 3D OFDM system be a possible candidate for a physical layer transmission scheme in future WSNs.
Highlights
Nowadays, internet of things technique has been developed rapidly
To reduce peak-to-average power ratio (PAPR) of the 3D orthogonal frequency division multiplexing (OFDM) system efficiently, we proposed a new partition method based on diagonal rule (DR) as shown in Figure 5, where an empty circle represents a zero-padded subchannel
The OFDM system with 3D signal constellations is considered in this paper
Summary
Internet of things technique has been developed rapidly. Some transmission scenarios of wireless network have extensive applications such as wireless ad hoc and sensor networks [1, 2]. With elaborate use of the guard interval, intersymbol interference (ISI) can be removed completely [5] Due to such desirable characteristics, the OFDM has already been exploited to realize a physical layer transmission scheme for high-rate wireless networks such as IEEE 802.11 series [6] and IEEE 802.15.3 [7]. To modulate a lot of 3D subcarrier signals at the same time, a 2D inverse discrete Fourier transform (IDFT) (or a 2D fast Fourier transform for reduction of computational complexity) is adopted Such a new OFDM system has been proved to have better symbol error performance than. DR of signal distribution is followed to generate each subblock based on the conventional SPS methods. The new algorithm with the DR interleaved scheme has remarkable improvement as compared to the adjacent and pseudo-random method Both computational complexity and searching procedure keep the same as the conventional PTS technique.
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