DHT-Based FBMC Receiver for MIMO Integration

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Solution Overview

Problem

Conventional filter bank multicarrier (FBMC) communication systems, particularly FBMC/OQAM, face challenges in extending to multiple-input multiple-output (MIMO) scenarios due to high implementation complexity and inability to directly apply conventional MIMO techniques, leading to suboptimal bit-error-rate (BER) performance and increased complexity in IDFT and DFT operations.

Innovation Solution

The introduction of a DHT-FBMC/QAM system that employs the discrete Hartley transform (DHT) and inverse discrete Hartley transform (IDHT) for both transmitter and receiver, utilizing two prototype filters to minimize self-interference and simplify complex-valued IDFT/DFT computations, enabling easier integration with MIMO techniques.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If FBMC/OQAM uses complex-valued IDFT and DFT operations, then spectral efficiency is improved, but implementation complexity increases

Engineering Contradiction:

Improvespectral efficiencyVSAvoidimplementation complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent replaces the complex-valued IDFT/DFT operations with real-valued Hartley transform operations. The Hartley transform uses only real arithmetic operations instead of complex arithmetic, substituting the computational mechanism while maintaining the spectral efficiency benefits of FBMC/OQAM. This is achieved through the use of prototype filters designed for real-valued operations and modified modulation/demodulation procedures that avoid complex number computations.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Productivity

If conventional MIMO techniques are applied to FBMC/OQAM, then system capacity is improved, but receiver complexity increases

Engineering Contradiction:

Improvesystem capacityVSAvoidreceiver complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent changes the fundamental parameter of the transform domain from complex-valued DFT to real-valued Hartley transform. This parameter change enables direct application of conventional MIMO techniques because the real-valued domain simplifies the mathematical operations required for MIMO processing, reducing receiver complexity while maintaining system capacity improvements.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If FBMC/OQAM uses real field orthogonality, then intersymbol interference is reduced, but adaptability to MIMO scenarios deteriorates

Engineering Contradiction:

Improveintersymbol interference reductionVSAvoidMIMO scenario adaptability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent makes the FBMC/OQAM system universal by enabling it to function effectively in both single-input single-output and multiple-input multiple-output scenarios. The real-valued Hartley transform provides a unified framework that maintains the intersymbol interference reduction benefits of real field orthogonality while simultaneously improving adaptability to MIMO scenarios through simplified computational operations.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS10819549B2Receiver of filter bank multicarrier communication system based on discrete Hartley transform

Publication Date: 2020.10.27 NATIONAL TSING HUA UNIVERSITY

AI summary

A filter bank multicarrier communication system is proposed. The system adopts the real-valued discrete Hartley transform for both multicarrier modulation and demodulation, rather than the complex-valued inverse discrete Fourier transform for multicarrier modulation and the discrete Fourier transform for multicarrier demodulation in conventional filter bank multicarrier schemes, so as to reduce implementation complexity and to enhance system performance.