Diversity Agent for MIMO-OFDM Spatial Frequency Interleaving
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Solution Overview
Problem
Wireless systems face limitations in spatial diversity and frequency diversity, which restrict their performance enhancement capabilities.
Innovation Solution
Implementing a diversity agent that performs symbol level spatial interleaving and space-frequency techniques, such as cyclic shifting, to map coded information onto multiple antennas and OFDM tones, providing enhanced spatial and frequency diversity in MIMO-OFDM systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spatial diversity or frequency diversity is used to improve wireless system performance, then range or throughput is improved, but the amount of diversity available is limited
Solution Approach 1:
The patent extends traditional frequency diversity by introducing space-frequency interleaving that operates across both frequency subcarriers and spatial antenna dimensions. This creates an additional diversity dimension by mapping coded bits across multiple antennas and frequency subcarriers simultaneously, thereby increasing the total amount of diversity available beyond what frequency diversity alone can provide.
2Reliability
If spatial diversity or frequency diversity is used to improve wireless system performance, then range or throughput is improved, but system complexity increases
Solution Approach 1:
The patent segments the coded bit stream into multiple portions and distributes them across different spatial streams and frequency subcarriers through space-frequency interleaving. This segmentation approach enables diversity gain by ensuring that redundant information is spread across multiple independent channels, improving reliability while maintaining manageable system complexity through structured distribution.
3Productivity
If multiple antennas are used to provide spatial diversity, then range or throughput is improved, but the system requires more complex signal processing
Solution Approach 1:
The patent applies space-frequency interleaving at the transmitter before signal transmission, preliminarily distributing coded bits across multiple antennas and frequency subcarriers. This preliminary action ensures that diversity is built into the transmitted signal structure, allowing the receiver to benefit from diversity gain without requiring complex iterative processing or advanced signal separation techniques.
Data Source
AI summary
A system, apparatus, method and article to manage diversity for a wireless multicarrier communication system are described. An apparatus may include a diversity agent to couple to a transmitter, the diversity agent to convert a determined number of input bits into symbols, interleave the symbols across multiple spatial streams, and map the symbols to tones for each spatial stream. Other embodiments are described and claimed.