BF-OFDM Modulator Architecture With Constant-Size IDFT

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Solution Overview

Problem

The existing hardware implementation of Block-Filtered OFDM (BF-OFDM) transmitters for 5G communication is complex and resource-intensive, particularly due to varying transmission bands and numbering systems, which complicates FPGA implementation and leads to hardware resource limitations and increased costs.

Innovation Solution

A variant OFDM modulator architecture with a constant-size discrete inverse Fourier transform and a filler module that inserts null carriers independently of parity, along with a decimation and spectrum shifting module, to simplify hardware implementation and maintain orthogonality without data flow interruptions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a variant OFDM modulator architecture with constant-size IDFT and filler module is used, then device complexity is reduced and hardware resources are optimized, but the ability to handle varying transmission bands and numbering systems may be limited

Engineering Contradiction:

Improvehardware implementation complexityVSAvoidadaptability to varying transmission bands

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent changes the parameter of IDFT size from variable to constant, which simplifies the hardware architecture. By fixing the IDFT size and using a filler module to handle variable data lengths, the system achieves consistent hardware resource usage across different transmission bands and numbering configurations, thereby reducing device complexity while maintaining adaptability through parameter standardization.

Inventive Principle:

Principle #35Parameter changes

2Quantity of substance

If hardware resources are reduced for FPGA implementation, then cost and resource requirements decrease, but the system's capability to support diverse 5G applications may be compromised

Engineering Contradiction:

Improvehardware resourcesVSAvoidscalability for diverse applications

Core Design Contradiction:

Quantity of substanceVSAdaptability or versatility

Solution Approach 1:

The patent creates a universal OFDM modulator architecture that can handle multiple 5G applications and transmission scenarios through a standardized constant-size IDFT approach. The filler module and spectrum shifting mechanism enable the same hardware structure to adapt to different transmission bands and numbering systems, providing multi-functionality without requiring additional hardware resources for each specific application scenario.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12015513B2OFDM modulator for block-filtered OFDM transmitter, related block-filtered OFDM transmitter and transceiver system

Publication Date: 2024.06.18 COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES

AI summary

An OFDM modulator including a predistortion module configured to receive the Nc consecutive data carriers and configured to compensate for distortion subsequently introduced by a polyphase filter bank connectable to the output of the OFDM modulator, a transformation module configured to apply a discrete inverse Fourier transform of constant size NIDFT independently of the numbering and transmission band used by the OFDM transmitter including the OFDM modulator, a filling module, the input of which is connected to the output of the predistortion module, and the output of which is connected to the input of the transformation module, and configured to insert (NIDFT−Nc) null carriers in succession to the Nc consecutive data carriers independently of the parity of the index i associated with the OFDM modulator.