Enhanced Spatial Modulation Throughput Complexity Trade-off
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional Spatial Modulation (SM) systems reduce transmission complexity but compromise data throughput compared to Spatial Multiplexing (SMX) systems, necessitating a method to enhance data transmission efficiency while maintaining reduced system complexity.
Innovation Solution
The method involves selecting multiple transmit modulation schemes and antennae combinations, using interpolated signal constellations to increase the number of bits transmitted per channel use, and ensuring minimum Euclidean distance between signal values, thereby enhancing spatial modulation capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spatial multiplexing is used to transmit parallel independent data streams from different transmit antennae, then data throughput is increased, but system complexity increases due to requiring multiple RF chains
Solution Approach 1:
The patent segments the data stream into multiple sub-streams and assigns them to different spatial modulation modes (first spatial modulation mode and second spatial modulation mode). Each mode uses a different subset of transmit antennae, allowing the system to achieve high throughput while maintaining lower complexity by processing data in segmented portions rather than requiring full parallel processing across all antennae simultaneously.
Solution Approach 2:
The patent dynamically switches between different spatial modulation modes depending on channel conditions and data requirements. The system can transition between first and second spatial modulation modes, adjusting which transmit antennae are active and how data is mapped, thereby optimizing the balance between throughput and complexity for different operational scenarios.
2Device complexity
If conventional spatial modulation is used to reduce the number of RF chains, then system complexity is reduced, but data throughput decreases compared to spatial multiplexing
Solution Approach 1:
The patent merges the advantages of spatial multiplexing and spatial modulation by combining multiple spatial modulation modes with multiple RF chains. The system integrates first and second spatial modulation modes, each utilizing different antenna subsets, while maintaining multiple RF chains to support both modes simultaneously. This merging achieves the throughput benefits of spatial multiplexing while preserving the complexity reduction benefits of spatial modulation.
Solution Approach 2:
The patent introduces an additional dimension to conventional spatial modulation by incorporating multiple spatial modulation modes that differ in their antenna usage patterns and modulation characteristics. Instead of using a single spatial modulation mode, the system employs multiple modes that can be activated based on channel conditions, effectively adding a mode-selection dimension that enhances throughput without proportionally increasing complexity.
3Productivity
If multiple spatial modulation modes are combined to increase data throughput, then information bits transmitted per channel use increases, but the number of combinations to manage increases
Solution Approach 1:
The patent performs preliminary action by pre-configuring multiple spatial modulation modes with different antenna combinations and modulation parameters before actual data transmission. The system prepares a set of predefined modes that can be quickly selected and activated based on channel conditions, avoiding the need to dynamically configure complex antenna combinations in real-time. This preliminary preparation reduces the computational burden of managing multiple modes during active transmission.
Data Source
AI summary
A method of transmitting data comprising choosing a transmit modulation scheme of the transmission, choosing a transmit parameter of the transmission, transmitting the data stream according to the chosen transmit modulation and transmit parameter such that data of the data stream is transmitted by the modulation scheme and the choice of transmit parameter.