Uplink Control Information Transmission in OFDMA Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current OFDMA communication systems face challenges in transmitting uplink control information efficiently due to limited frequency-time axis resources, leading to increased error rates and degraded channel estimation performance, especially when using binary channel encoding and coherent modulation.
Innovation Solution
Implementing an M-ary channel encoding scheme combined with non-coherent modulation to enhance reliability and reduce overhead rates, allowing for efficient transmission of uplink control information using a smaller number of pilot tones and optimizing system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If binary channel encoding and coherent modulation are used for uplink control information transmission, then the transmission method is simple and compatible with existing systems, but the error rate increases and channel estimation performance degrades due to limited frequency-time axis resources
Solution Approach 1:
The patent changes the fundamental parameters of channel encoding (from binary to M-ary where M≥2) and modulation schemes (from coherent to non-coherent), transforming the transmission methodology to achieve better reliability under resource constraints while maintaining practical implementability
Solution Approach 2:
The patent introduces dynamic adaptation by allowing the system to select different M-ary encoding orders and non-coherent modulation schemes based on channel conditions and resource availability, enabling flexible optimization of transmission reliability without requiring complex coherent detection infrastructure
2Reliability
If more frequency-time axis resources are allocated for uplink control information to reduce error rates, then transmission reliability improves, but overhead rates increase and system throughput decreases
Solution Approach 1:
By changing from binary encoding to M-ary encoding (M≥2) and using non-coherent modulation, the patent increases the information carrying capacity per resource element, allowing reliable transmission with fewer allocated resources and thus reducing overhead while maintaining or improving throughput
Solution Approach 2:
The patent creates a more efficient representation of control information through M-ary encoding, where multiple bits are encoded into fewer symbols, effectively compressing the control information transmission and reducing the resource overhead required
Data Source
AI summary
Disclosed are an apparatus and a method for transmitting uplink control information in an OFDMA communication system. The method, in which the uplink control information is transmitted using an ACK channel in the OFDMA communication system, includes the steps of receiving data bits of the uplink control information, outputting transmit symbols of sub-carriers by performing orthogonal modulation with respect to symbols for codewords of the received data bits, and inverse fast fourier transforming and transmitting a transmit signal including bundles of sub-carriers allocated the modulated transmit symbols.