MIMO-OFDM Bit Power Distribution Optimization
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Solution Overview
Problem
The combination of MIMO-OFDM and AMC techniques in radio communication systems results in a high number of data substreams, leading to a significant increase in the amount of calculation required for determining adaptive transmission parameters and power distribution, making it difficult to implement effectively.
Innovation Solution
A transmission method and apparatus that optimize the distribution of transmission bits and power in the spatial domain by calculating signal-to-interference and noise ratio gains for each data substream, reducing the number of dimensions for distribution and leveraging correlation between adjacent subcarriers to simplify the algorithm and reduce processing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MIMO-OFDM and AMC techniques are combined to improve system performance and information transmission rate, then channel capacity and transmission quality are improved, but the number of data substreams increases significantly (Nc×nT) leading to enormous calculation burden for determining adaptive transmission parameters
Solution Approach 1:
The patent segments the adaptive transmission parameter determination process into two distinct stages: (1) spatial domain optimization for a representative subcarrier, and (2) frequency domain extension to adjacent subcarriers using correlation. This segmentation reduces the calculation burden by avoiding exhaustive optimization across all Nc×nT substreams simultaneously, while still achieving near-optimal system performance through the structured two-stage approach.
2Reliability
If adaptive transmission parameters are optimized for every data substream in the MIMO-OFDM-AMC system, then transmission performance is maximized, but the processing complexity and computational resources required become prohibitively high
Solution Approach 1:
The patent performs preliminary optimization in the spatial domain for a representative subcarrier before extending results to frequency domain. By establishing optimal transmission bit and power distribution parameters in the spatial domain first, the system creates a foundation that can be efficiently extended to adjacent subcarriers using correlation properties, thereby reducing overall processing complexity while maintaining transmission performance.
Solution Approach 2:
The patent utilizes channel correlation information between adjacent subcarriers as feedback to extend optimization results from the representative subcarrier to neighboring subcarriers. This feedback mechanism allows the system to adapt transmission parameters across frequency without performing exhaustive optimization on each subcarrier independently, thus maintaining reliability while reducing processing complexity.
3Productivity
If the number of transmitting antennas and receiving antennas is increased to improve channel capacity, then information transmission rate increases, but the amount of calculation for processing adaptive transmission parameters increases enormously
Solution Approach 1:
The patent changes the dimensionality of the optimization approach by separating spatial domain optimization from frequency domain extension. Instead of optimizing all antenna-subcarrier combinations simultaneously in a high-dimensional space, the system first optimizes spatial parameters independently, then extends to frequency using correlation. This dimensional separation makes the problem tractable even when the number of antennas is large, as the computational complexity no longer scales with the product of antenna count and subcarrier count.
Data Source
AI summary
A transmission bit and transmission power distributing method that can reduce the arithmetic amount in a multiantenna-input/multiantenna-output (MIMO) wireless communication system. This method comprises steps of calculating a signal-to-interference-noise ratio (SINR) gain after MIMO detection of each of transport substreams (S601, S602); optimizing, based on the acquired SINR gain, a transmission bit and transmission power distribution in the space domain for all transport substreams on a particular subcarrier in the frequency domain, thereby deciding a transmission bit and transmission power distribution parameters (S603, S604); and optimizing a transmission bit and transmission power distribution for adjacent subcarriers, by sequentially using the transmission bit and transmission power distribution parameters distributed on the subcarrier for which the transmission bit and transmission power distribution parameters have been decided (S605 to S610).