OFDM transmission and reception

Simple SummaryContent extracted from patent full text and abstract with AI.

The patent describes a new method for transmitting and receiving OFDM (Orthogonal Frequency Division Multiplexing) signals using a novel non-systematic mapping approach, specifically for Unique Word (UW) based OFDM. Unlike traditional UW-OFDM that divides subcarriers into data and redundant ones, this invention employs a non-systematic mapping (such as a non-systematic generator matrix) to spread redundancy across all subcarriers. This enhances spectral properties and bit error rate (BER) performance by optimizing how redundancy and data are distributed, resulting in greater transmission efficiency and robustness, particularly in environments with multipath or frequency-selective channels.

Use CasesContent extracted from patent full text and abstract with AI.

• Wireless local area networks (WLAN), such as those based on IEEE 802.11 standards
• Broadband wireless communication systems, including Wi-Fi, LTE, and future 5G/6G networks
• Digital television broadcasting
• Broadband powerline communications
• Any OFDM-based system requiring improved synchronization, channel estimation, or spectral efficiency
• Mission-critical wireless communications needing resilience to multipath fading or frequency-selectivity

BenefitsContent extracted from patent full text and abstract with AI.

• Significantly improves bit error rate (BER) performance over traditional OFDM and previous UW-OFDM approaches, as demonstrated by simulation results.
• Reduces the energy overhead traditionally associated with redundant subcarriers by spreading redundancy across all subcarriers, leading to increased data transmission efficiency.
• Provides better suppression of out-of-band emissions (lower spectral sidelobes), resulting in cleaner spectra and less interference to adjacent frequencies.
• Facilitates more reliable synchronization and channel estimation at the receiver, as the unique word is both deterministic and embedded within the DFT window.
• Supports flexible implementation, allowing adaptation of the mapping matrix based on channel conditions, which can be signaled between transmitter and receiver.
• Can be realized in both hardware and software, suitable for digital and programmable logic devices.
• Offers compatibility with existing OFDM standards, enabling straightforward integration into current communication systems while delivering performance gains.

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Patent Abstract

A more efficient OFDM concept of the UW-OFDM type is obtained, To this end, the systematic subdivision of the frequency domain subcarriers into ones representing redundant subcarriers and ones representing data subcarriers is given up, and a non-systematic mapping function such as a non-systematic generator matrix is used instead in order to map the data symbols onto the frequency domain samples.