Transform-precoding of a Selective Set of Data for Transmission over a Wireless Communication

Computer Sciences and Information Technology

Signal processing

Market – Next Generation Wireless Communication market size is to grow at 15.4% CAGR by 2027.

Watermarking IP design,

Electronic circuits

Communication at higher frequency bands such as GHz/THz frequencies pose several challenges such as higher Phase Noise (PN), extreme propagation loss, high atmospheric absorption in certain frequencies, lower power amplifier (PA) efficiency, etc.
The waveform adopted in 3GPP standards is Cyclic Prefixed Orthogonal Frequency Division Multiplexing (CP-OFDM) which is composed of superposition of multiple signals transmitted using narrowband orthogonal subcarriers.
However, the superposition of multiple signals results in higher peak to average power ratio (PAPR) values. The cost of PA increases exponentially for every doubling of the power. For reducing the PAPR values, the multiple signals are converted into a single carrier waveform by transform-precoding.

The technology is a method of processing a bit stream for transmission over a wireless communication network. The system comprises mapping by a Base Station (BS), which performs significant processing such as selection of the modulation symbols for transform precoding.
This technique uses a DFT – precoding over a selective set of data while in combination with CP-OFDM targeting lower PAPR, to be used mainly in applications operating in frequencies above 71 GHz and in non-terrestrial networks (NTN).
This technique is applied over every OFDM-symbol based on one or more decision criteria. The PAPR gain achieved by using this technique is proportional to the part of the bandwidth that uses DFT pre-coded transmission.
A signal with lower PAPR can be operated closer to the saturation region, and thereby reduces the cost by efficient utilization of the PA. Therefore, to utilize the PA efficiently, a waveform with low PAPR is required.

Signal with low PAPR leads to reduce the overall cost of managing the PA in higher frequencies (GHz / THz).
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Prof. Bhaskar Ramamurthi

Department of Electrical Engineering

Mr. Dhivagar Baskaran

Centre of Excellence in Wireless Technology

TRL – 2/3

Technology Concept formulated.

Technology Transfer