Bit-Interleaved MIMO OFDM Transmission for Multipath Channels
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Solution Overview
Problem
Current orthogonal frequency division multiplexing (OFDM) and multiple-input multiple-output (MIMO) techniques lack a comprehensive system design to effectively combine and support high data rate wireless services, particularly in multipath environments, leading to inefficiencies and incompatibilities in link-level design.
Innovation Solution
The proposed solution involves bit-interleaving data streams across multiple transmitters and subcarriers with minimal correlation, using multiple antennas and convolutional encoding, and employing MIMO and OFDM modulation to enhance spectral efficiency and data throughput, while also incorporating turbo-like codes for robustness against channel disruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If OFDM and MIMO techniques are combined to increase spectral efficiency and data throughput, then data transmission rate and spectral efficiency are improved, but system design complexity and implementation difficulty increase due to lack of complete system design and link-level design compatibility
Solution Approach 1:
The patent segments the data stream into multiple parallel streams for transmission over multiple subcarriers and antennas. The bit-interleaved structure divides the original data into N parallel streams, each transmitted over a different subcarrier-antenna combination, thereby managing complexity through systematic decomposition of the transmission task
Solution Approach 2:
The patent extends the transmission from traditional single-antenna or simple MIMO configurations to a multi-dimensional structure involving multiple antennas, multiple subcarriers, and bit-interleaving across these dimensions. This creates a systematic framework that manages complexity by organizing transmission resources across multiple dimensions
2Reliability
If bit-interleaving is applied across multiple transmitters and subcarriers to minimize correlation, then resilience to channel disruptions is improved, but processing complexity and computational requirements increase
Solution Approach 1:
The patent applies bit-interleaving as a preliminary processing step before transmission, organizing the data bits into an N×M interleaved matrix that distributes consecutive bits across different subcarriers and antennas. This preliminary arrangement ensures diversity protection before the signal encounters channel disruptions, reducing the need for complex post-processing
Solution Approach 2:
The patent changes the organizational parameters of the data stream by transforming it from a sequential structure to an interleaved matrix structure. This parameter change in data organization distributes correlation across different transmission resources, improving reliability without requiring complex adaptive processing during transmission
3Productivity
If multiple antennas and subcarriers are used simultaneously to increase spectral efficiency, then data transmission capacity is improved, but compatibility and integration difficulty increase due to lack of complete system design
Solution Approach 1:
The patent creates a universal bit-interleaved transmission framework that can accommodate multiple antennas and subcarriers in a systematic manner. The N×M interleaved structure provides a flexible template that can be adapted to different numbers of antennas and subcarriers, ensuring compatibility across various system configurations
Solution Approach 2:
The patent employs dynamic resource allocation within the bit-interleaved framework, where the mapping of bits to subcarrier-antenna combinations can be flexibly configured based on channel conditions and system requirements. This dynamic approach enhances compatibility by allowing the system to adapt to different operational scenarios
Data Source
AI summary
A datastream of bits (which may itself be comprised of a plurality of datastreams as derived from a plurality of sources) are coded (21) and then interleaved (12) across a plurality of transmitters (25 and 26) and a plurality of subcarriers (27) as supported and shared by the transmitters. If desired, the bits can be mapped to corresponding symbols prior to transmission. The resultant information is transmitted simultaneously by the transmitters using the shared channel of subcarriers. Upon reception, the received signals are de-interleaved and decoded to recover the original datastream for each sources.