Layered Division Multiplexing Broadcast Signal Transceiver with MIMO
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current broadcast signal transceiving technologies face challenges in efficiently combining Layered Division Multiplexing (LDM) with Multiple-Input Single-Output (MISO) or Multiple-Input Multiple-Output (MIMO) schemes, particularly when using Alamouti encoding and Transmit Diversity Code Filter Set (TDCFS), leading to increased complexity and performance degradation, especially in networks with three or more transmitters.
Innovation Solution
The proposed solution involves an apparatus and method that generate enhanced-layer signals through Bit-Interleaved Coded Modulation (BICM) and MIMO precoding, combining core-layer and enhanced-layer signals at different power levels, and using Alamouti encoding and TDCFS for transmitting and receiving broadcast signals across multiple antennas, while maintaining orthogonality and reducing correlation between signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Layered Division Multiplexing is combined with MISO or MIMO schemes, then broadcast signal transceiving performance is improved, but receiver complexity increases
Solution Approach 1:
The patent segments the signal processing into distinct core layer and enhanced layer processing paths. The core layer handles basic signal reception while the enhanced layer processes additional signals with higher power levels. This segmentation allows the receiver to handle multiple signals systematically without overwhelming complexity, as each layer can be processed independently with dedicated processing resources.
Solution Approach 2:
The patent introduces a power level dimension to differentiate between core layer and enhanced layer signals. By arranging signals at different power levels (core layer at lower power, enhanced layer at higher power), the system creates a hierarchical structure that simplifies receiver processing. The receiver can first decode the robust core layer signal and then process the enhanced layer signal, effectively managing complexity through dimensional organization.
2Reliability
If multiple antenna schemes are used to improve signal robustness, then spatial diversity gain is achieved, but signal degradation occurs in certain areas due to multipath conditions
Solution Approach 1:
The patent applies different processing qualities to different signal layers. The core layer signal receives standard processing while the enhanced layer signal receives enhanced processing with higher power levels. This local quality differentiation allows the system to optimize for specific reception conditions, providing robustness where needed while maintaining simplicity elsewhere, thereby managing multipath interference effects selectively.
Solution Approach 2:
The patent changes the power level parameter to differentiate between core layer and enhanced layer signals. By adjusting power levels as a key parameter, the system creates distinct signal characteristics that help the receiver identify and process each layer appropriately. This parameter change enables the receiver to handle multipath conditions more effectively by processing signals at different power levels with appropriate processing techniques.
3Productivity
If Alamouti encoding and TDCFS techniques are applied, then spatial multiplexing gain is achieved, but receiver complexity increases when three or more transmitters are involved
Solution Approach 1:
The patent segments the encoding process into core layer and enhanced layer components. The core layer uses standard encoding while the enhanced layer applies additional encoding techniques. This segmentation allows the receiver to process signals in stages, first handling the core layer and then the enhanced layer, which reduces the immediate complexity burden when three or more transmitters are involved while still achieving spatial multiplexing gain.
Solution Approach 2:
The patent applies encoding techniques selectively rather than uniformly. The enhanced layer receives additional encoding processing beyond what the core layer receives. This partial application of excessive action (additional encoding) only where needed allows the system to achieve spatial multiplexing gain for the enhanced layer while keeping the core layer processing simple, thereby managing overall receiver complexity.
Data Source
AI summary
Disclosed herein are a method for transceiving a broadcast signal using a combination of multiple antenna schemes with layered division multiplexing and an apparatus for the method. A method for receiving a broadcast signal includes generating received signals based on signals that are received through multiple receiving antennas, estimating channels between the receiving antennas and transmitting antennas, restoring a core-layer signal corresponding to the received signals, and restoring an enhanced-layer signal based on a cancellation process, wherein the cancellation process corresponds to the core-layer signal and is separately performed for the individual receiving antennas.