MIMO-OFDM Transceiver Diversity Agent for Channel Resilience
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Solution Overview
Problem
Multicarrier wireless communication systems face challenges such as deep fades and multipath dispersion, which limit achievable rates in wireless local area networks and other applications due to environmental conditions.
Innovation Solution
The introduction of a diversity agent within a MIMO-OFDM transceiver that implements transmit diversity and space-frequency interleaving to map and demap content across multiple antennas and OFDM tones, enhancing channel resilience and code rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmit diversity and space-frequency interleaving are implemented across multiple antennas and OFDM tones, then channel resilience and code rate are enhanced, but device complexity increases
Solution Approach 1:
The patent segments the transmission process into distinct functional components: a diversity agent that performs transmit diversity mapping and a space-frequency interleaver that performs interleaving operations. This segmentation allows each component to be optimized independently while working together to enhance channel resilience through multiple antennas and OFDM tones.
Solution Approach 2:
The patent extends the transmission diversity from traditional spatial dimensions to include the frequency dimension by mapping signals across multiple OFDM tones. This space-frequency approach creates a two-dimensional diversity structure that improves channel resilience by distributing signals across both spatial (antennas) and frequency (tones) domains.
2Reliability
If multiple antennas and OFDM tones are used for transmit diversity, then intersymbol interference is reduced, but the system requires more complex signal processing
Solution Approach 1:
The patent applies preliminary action by performing transmit diversity mapping and space-frequency interleaving at the transmitter side before signal transmission. This pre-processing organizes the signal structure in advance, ensuring that intersymbol interference is mitigated through proper signal distribution across antennas and tones, while the receiver can efficiently reverse the process.
Solution Approach 2:
The diversity agent and interleaver structure act as intermediaries between the data source and the physical channel. These components transform the raw data into a diversity-encoded format that is more resilient to channel impairments, and the receiver's corresponding demapping and deinterleaving operations restore the original data while removing the interference effects.
3Productivity
If code rate is increased through diversity mapping, then throughput is improved, but the mapping complexity across antennas and subcarriers increases
Solution Approach 1:
The patent implements dynamic mapping strategies where the diversity agent and interleaver can adapt their operation based on channel conditions and throughput requirements. The system dynamically adjusts the mapping patterns across antennas and OFDM tones to optimize code rate and throughput while managing complexity through conditional logic and adaptive parameter selection.
Data Source
AI summary
Methods and apparatus to control transmission of a multicarrier wireless communication channel through multiple antennas is generally described.