Methods for Encoding and Decoding based on Partitioned Complementary Sequences


Reference #: 01512

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Orthogonal frequency division multiplexing (OFDM) waveform utilized in 4G, 5G, and Wi-Fi has peaky signal characteristics. Hence, the waveform is often distorted under a non-linear power amplifier of a practical radio. To avoid this distortion, either the transmit power is reduced, i.e., a shorter communication range, or an expensive power amplifier is employed at the radio to handle the large instantaneous peak power of OFDM transmission, which typically increases the power consumption of the radio (i.e., shorter life for a battery-operated radio).

Invention Description:

Among many other PAPR mitigation methods, complementary sequences (CSs) allow one to limit the peak instantaneous power of OFDM signals without any optimization method. However, a low-PAPR encoder based on CSs is not a straightforward task since a set of different CSs in the prior-art is typically restricted in terms of size, sequence length, and alphabet. In this invention, to address these issues, we disclose a set of methods for encoding and decoding based on "partitioned" CSs and exploit the gaps between the parts of a partitioned CS to encode information bits. The technology addresses the high peak-to-average-power ratio (PAPR) problem of a coded orthogonal frequency division multiplexing (OFDM) transmission (i.e., the waveform utilized in 4G, 5G, and Wi-Fi).

Potential Applications:

A large market considering the chipsets utilized in communication devices such as mobile phones, particularly, for next-generation networks, e.g., 6G and millimeter-wave based networks. The energy problem of 5G NR, which is directly related to the PAPR of the transmission, has been mentioned several times in the literature.

Advantages and Benefits:

The main benefits of the disclosed method are to 1) increase communication range, 2) reduce the cost of radio due to the power amplifier, and 3) increase the battery life of radio operated on battery.

Patent Information:
For Information, Contact:
Technology Commercialization
University of South Carolina
Alphan Sahin
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