Simultaneous Packet Transmission With Partitioned Constellations
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Solution Overview
Problem
Current communication systems face challenges in increasing throughput without significantly modifying existing modulation, demodulation, coding, and decoding techniques, particularly with constrained interleaved coded modulation (CICM) being limited to smaller block codes or short convolutional codes due to high decoding complexity and memory requirements.
Innovation Solution
The Simultaneous Packet Transmission (SPT) technique, which involves partitioning a signal constellation into distinct constellations to allow for higher code rates and increased throughput by assigning each partitioned constellation to a specific stream, enabling the use of higher rate codes on secondary streams while maintaining high minimum squared Euclidean distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If constrained interleaved coded modulation (CICM) is used to increase throughput, then transmission rate is improved, but decoding complexity and memory requirements increase significantly
Solution Approach 1:
The patent divides the signal constellation into multiple distinct partitioned constellations, each assigned to a specific stream. This segmentation allows independent coding and decoding for each stream, reducing the overall decoding complexity while maintaining high throughput through parallel processing of multiple streams with different code rates.
Solution Approach 2:
The patent applies different code rates to different streams by assigning each partitioned constellation to a specific stream with its own coding parameters. This local quality approach allows secondary streams to use higher code rates for increased throughput while primary streams use more robust coding, optimizing the balance between throughput and decoding complexity locally for each stream.
2Productivity
If higher code rates are used on secondary streams to increase throughput, then transmission rate is improved, but error performance may deteriorate
Solution Approach 1:
The patent segments the communication system into multiple streams with different reliability requirements. Primary streams use lower code rates for high reliability, while secondary streams use higher code rates for increased throughput. The segmentation of constellations and streams allows this differentiated approach without compromising overall system performance.
Solution Approach 2:
The patent changes the code rate parameter for different streams based on their importance and channel conditions. By adjusting the code rate parameter locally for each stream rather than using a uniform code rate, the system optimizes the trade-off between throughput and error performance for each individual stream.
3Productivity
If multiple streams with different code rates are used, then overall throughput is increased, but system complexity increases
Solution Approach 1:
The patent segments the signal constellation into multiple distinct partitioned constellations, where each partition is assigned to a specific stream. This segmentation enables independent processing of each stream with its own code rate, simplifying the overall system architecture while achieving higher throughput through parallel transmission of multiple streams.
Solution Approach 2:
The patent creates a universal framework where a single communication system can handle multiple streams with different code rates using the same physical channel and modulation scheme. The partitioned constellation approach provides a universal mechanism that accommodates varying code rates and stream priorities without requiring separate transmission channels or complex multiplexing infrastructure.
Data Source
AI summary
Methods for simultaneous packet transmission (SPT) may be used to transmit packets simultaneously on a communications link such the orthogonal frequency division multiplexed multiple access (OFDMA) downlink used in used in WiFi and LTE cellular/wireless mobile data applications. A first SPT method may employ multiple data streams and selects a subset of streams to form symbols during every intervals. This allows the use of variable code rates on different streams thereby increasing the overall throughput. A second SPT method may transmit a second data stream implicitly while transmitting a data stream explicitly on a communication channel. These SPT methods may be used either individually or jointly, and may be implemented via software changes at the transmitter and the receiver. Additionally, methods for applying constrained interleaved coded modulation (CICM) to low-density parity check (LDPC) codes and decoding LDPC codes with CICM are presented.