Wireless Preamble Design for Beamforming and OFDM Interoperability
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Solution Overview
Problem
In millimeter-wave wireless communication systems, existing technologies face challenges in achieving efficient interoperability and interference mitigation between devices using single-carrier and OFDM modulation modes, particularly in the 57 GHz to 66 GHz spectrum, due to limitations in Golay code usage and beamforming techniques.
Innovation Solution
The implementation of extended Golay codes, modified to generate preambles using a Kronecker product of cover sequences and modified Golay sequences, which are transmitted in both quasi-omni and directional patterns to facilitate improved frequency and spatial reuse, and the use of beamforming techniques for channel estimation and interference reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional Golay codes are used for preamble generation in millimeter-wave wireless communication, then device compatibility is maintained, but interference mitigation and frequency reuse efficiency are insufficient
Solution Approach 1:
The patent extends traditional Golay codes to create extended Golay codes with modified parameters. This extension changes the code structure and properties, enabling better interference mitigation through enhanced orthogonality while improving frequency reuse efficiency in millimeter-wave communications
Solution Approach 2:
The patent combines extended Golay codes with Kronecker products of cover sequences to create composite preamble structures. This composite approach integrates multiple code components with different properties, achieving both interference mitigation through orthogonality and improved frequency reuse
2Adaptability or versatility
If single-carrier common mode is used for interoperability between OFDM and single-carrier transceivers, then device compatibility is achieved, but beamforming capability and spatial reuse are limited
Solution Approach 1:
The patent segments the preamble structure into multiple components including extended Golay code portions and Kronecker product components. This segmentation allows different parts to serve different functions: maintaining compatibility while enabling beamforming and improving spatial coverage
Solution Approach 2:
The extended Golay code preamble structure is designed to be universal, serving multiple functions simultaneously. It maintains compatibility with both OFDM and single-carrier transceivers while also enabling beamforming operations and improving spatial reuse, making the same preamble structure adaptable to different transmission modes
3Measurement precision
If Golay codes are used for spreading and matched-filtering, then signal detection is enabled, but orthogonality between piconets is insufficient for interference reduction
Solution Approach 1:
The patent modifies the parameters of traditional Golay codes to create extended versions with enhanced orthogonality properties. This parameter extension maintains the signal detection capability through matched-filtering while adding improved orthogonality between different piconets, thereby reducing inter-piconet interference
Data Source
AI summary
A wireless communications network uses a beamforming process to increase signal quality as well as transmission capabilities and reduction of interference. An improved Golay sequence is also used in the wireless communications network. In one aspect, the processes can be used to communicate regardless of whether the system is on an OFDM mode or a single carrier mode.