Stream And Segment Parsing for Unequal MIMO Spatial Modulation
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Solution Overview
Problem
Existing wireless communication technologies lack defined methods for parsing streams of input bits into spatial streams for unequal modulation (UEQM) to adapt to signal quality, which affects system throughput and reliability, particularly in MIMO channels with large channel condition numbers.
Innovation Solution
Implementing stream and segment parser designs that encode input bits into coded bits and parse them into multiple spatial streams with unequal modulation, applying different modulations to each stream to improve throughput and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If equal modulation is used for all spatial streams, then device complexity is reduced, but system throughput and reliability deteriorate due to inability to adapt to signal quality variations
Solution Approach 1:
The patent divides the bit stream into multiple segments and assigns different modulation schemes to different spatial streams based on signal quality. The stream parser and segment parser separately manage bit allocation to enable unequal modulation while maintaining manageable complexity through structured segmentation.
Solution Approach 2:
The patent applies different modulation qualities to different spatial streams according to their individual signal conditions. Each spatial stream receives customized modulation parameters (QPSK, 16QAM, 64QAM) based on its channel conditions, optimizing performance for each stream rather than using uniform modulation.
2Productivity
If unequal modulation is applied to adapt to signal quality, then system throughput improves, but device complexity increases due to need for stream and segment parsers
Solution Approach 1:
The patent implements segmentation by dividing the bit stream into multiple segments and using separate stream parser and segment parser functions. This structured approach manages complexity through functional separation while enabling flexible bit allocation for unequal modulation across spatial streams.
Solution Approach 2:
The patent employs dynamic bit allocation where the number of bits assigned to each spatial stream varies based on signal quality. The stream parser dynamically determines bit distribution patterns (e.g., 2:2:2:2, 3:3:1:1) to optimize throughput while managing complexity through algorithmic flexibility rather than hardware complexity.
3Reliability
If bits are allocated equally across spatial streams, then device complexity is minimized, but reliability deteriorates due to inability to optimize for individual stream conditions
Solution Approach 1:
The patent applies local quality optimization by assigning different modulation schemes to different spatial streams based on their individual signal conditions. Each stream receives customized modulation parameters matched to its channel quality, maximizing reliability for each stream while the parser manages allocation complexity through standardized algorithms.
Data Source
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AI summary
Various schemes pertaining to stream parser and segment parser designs for unequal modulation, UEQM, of spatial streams in wireless communications are described. An apparatus, e.g., an access point, AP, station, STA, or non-AP STA, processes a stream of bits by: -a- encoding the stream of bits into a stream of coded bits; and -b-parsing the stream of coded bits into a plurality of streams of coded bits (1010). The apparatus then transmits the plurality of streams of coded bits with UEQM in a plurality of spatial streams (1020).