Shared-Resource Multi-User Transmission With Sub-Codeword Feedback
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Solution Overview
Problem
Conventional wireless communication networks face performance degradation and high access delays when managing access requests from a large number of devices, particularly in scenarios with hundreds or thousands of user devices, due to the inefficiencies of contention-based random access procedures.
Innovation Solution
The proposed solution involves a transmitter and receiver architecture that allows user devices to transmit non-orthogonal information-bearing sequences over shared channel resources, using compressed sensing-based detection algorithms and feedback mechanisms to adjust transmission rates and lengths, enabling seamless adaptation to channel conditions and improving detection fidelity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If contention-based random access procedures are used to manage access requests from a large number of devices, then the network can handle basic access requests, but performance degradation and high access delays occur when hundreds or thousands of devices attempt to access simultaneously
Solution Approach 1:
The codeword is divided into multiple sub-codewords that are transmitted sequentially over shared resources. This segmentation allows the system to handle multiple users simultaneously by dividing the transmission into manageable parts, improving network throughput while reducing access delays through parallel processing of different sub-codewords
Solution Approach 2:
The transmission scheme dynamically adjusts the number of sub-codewords transmitted based on feedback from the receiver about successful decoding. This dynamic adaptation allows the system to optimize resource usage and reduce unnecessary retransmissions, thereby improving throughput and reducing access delays
2Productivity
If multiple users transmit data over shared resources simultaneously, then network resource utilization improves, but detection precision and reliability degrade due to interference
Solution Approach 1:
The receiver provides feedback to transmitters about successful decoding of transmitted data. This feedback mechanism allows the system to adjust transmission parameters, retransmit only necessary sub-codewords, and optimize detection accuracy while maintaining high resource utilization through coordinated multi-user transmission
Solution Approach 2:
The system changes transmission parameters such as the number of sub-codewords, transmission power, and resource allocation based on channel conditions and decoding success. These parameter adjustments optimize both resource utilization and detection fidelity by adapting to varying interference levels and channel quality
3Reliability
If conventional request-grant procedures are used for data transmission, then individual user transmission reliability is maintained, but overall network productivity and speed are reduced due to sequential access
Solution Approach 1:
Multiple users merge their transmissions by sending sub-codewords over shared resources simultaneously. The receiver combines these transmissions and provides feedback on successful decoding, enabling parallel processing that improves network throughput while maintaining reliability through the feedback mechanism that ensures correct data reception
4Speed
If the entire codeword is transmitted in a single block, then transmission speed is fast, but reliability decreases when channel conditions are poor or interference is high
Solution Approach 1:
The codeword is segmented into multiple sub-codewords transmitted sequentially. This segmentation allows the receiver to decode successfully received sub-codewords while requesting retransmission of failed ones, thereby maintaining high transmission speed through parallel processing while improving reliability through selective retransmission based on decoding success
Data Source
AI summary
A transmitter for transmitting data to a receiver of a wireless communication network, the transmitter includes at least one antenna, a codebook, an encoder, and a transceiver coupled to the encoder and to the at least one antenna. The codebook includes a plurality of codewords, each codeword being a vector including a plurality of symbols, each symbol to be transmitted over resources of the wireless communication network. The encoder is configured to receive an information message to be transmitted to a receiver of the wireless communication network, to select from the codebook the codeword associated with the received information message, and to divide the selected codeword into a plurality of sub-codewords. The transceiver is configured to transmit via the at least one antenna a first sub-codeword, and to transmit via the at least one antenna a second sub-codeword responsive to an indication that the encoded information message was not successfully decoded at the receiver on the basis of the received first sub-codeword.