Golay Sequence Guard Intervals for MIMO Signal Integrity
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Solution Overview
Problem
Current wireless communication systems, particularly in the millimeter wave frequency band, face challenges in maintaining signal integrity due to channel distortions, which affect data transmission rates and reliability, especially in multi-antenna systems.
Innovation Solution
The use of Golay complementary sequences and Golay Sequence Sets (GSSs) for channel estimation and guard interval design in Multiple Input Multiple Output (MIMO) transmissions, which include generating Golay sequences of varying lengths to mitigate inter-symbol interference and adapt to different channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional guard intervals are used in millimeter wave wireless networks, then device compatibility is maintained, but signal integrity deteriorates due to channel distortions and inter-symbol interference
Solution Approach 1:
The patent changes the parameter of guard interval structure by incorporating Golay complementary sequences with specific autocorrelation properties. These sequences provide enhanced correlation characteristics that mitigate inter-symbol interference caused by millimeter wave channel distortions, while maintaining compatibility through standardized sequence lengths and structures that legacy devices can process
Solution Approach 2:
The patent creates a composite guard interval structure by combining Golay complementary sequences with traditional guard interval formats. This composite approach integrates the interference-mitigation properties of Golay sequences with the compatibility features of conventional guard intervals, achieving both improved signal integrity and legacy device support
2Productivity
If Multiple Input Multiple Output (MIMO) techniques are implemented to increase data transmission rate, then productivity improves, but device complexity increases
Solution Approach 1:
The patent segments the MIMO transmission signal into multiple independent Golay complementary sequences, each assigned to different spatial streams. This segmentation allows each sequence to be processed independently through the complex MIMO channel, simplifying the receiver's ability to separate and decode multiple simultaneous transmissions while maintaining high data rates
Solution Approach 2:
The patent utilizes the autocorrelation properties of Golay sequences as an inherent feedback mechanism. The sequences' mathematical properties provide automatic signal characterization that aids the receiver in estimating channel conditions and adjusting equalization parameters, reducing the complexity of explicit feedback channels in MIMO systems
3Measurement precision
If channel estimation is performed to mitigate channel distortions, then measurement precision improves, but loss of time increases due to additional processing
Solution Approach 1:
The patent performs preliminary channel estimation using the known Golay complementary sequences embedded in the guard intervals before main data transmission processing. The autocorrelation properties of these sequences enable rapid initial channel characterization, providing accurate enough estimates for equalization without requiring extensive additional processing time during active data transmission
Data Source
AI summary
This disclosure describes methods, apparatus, and systems to increase the transmission data rate in wireless networks, for example, by using one or more Multiple Input Multiple Output (MIMO) and/or channel bonding techniques. In one embodiment, the disclosure describes the use of Golay Sequence Sets (GSS) to define guard intervals (GIs) for single carrier (SC) single channel bonding and multiple input multiple output (MIMO) transmission. In various embodiments, the disclosure describes the design of guard interval sequence for 3 types of guard intervals having lengths that can be classified as short, medium, and long. In another embodiment, the disclosure defines the guard interval for single channel transmission channel bonding and for MIMO transmission.