CP-OFDM Uplink Pilot Mapping for Waveform Multiplexing
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Solution Overview
Problem
Current wireless communication systems lack a solution for transmitting pilots using the CP-OFDM waveform and multiplexing different waveforms over the same resource in uplink transmission, leading to inefficiencies in pilot transmission and resource utilization.
Innovation Solution
A method for determining and mapping pilots onto a pilot transmission symbol using a comb interval and frequency-domain start position, allowing terminals supporting CP-OFDM to transmit pilots efficiently, and enabling multiplexing of different waveforms over the same resource, improving resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DFT-S-OFDM waveform is used in uplink transmission, then single-carrier characteristic is guaranteed, but pilot overhead is significant when transmission length is small
Solution Approach 1:
The patent changes the parameter of waveform type from DFT-S-OFDM to CP-OFDM for uplink transmission. This allows flexible configuration of pilot patterns and positions, enabling optimization of pilot overhead while maintaining reliable transmission. The base station can configure different pilot patterns adaptively based on transmission conditions.
2Device complexity
If only DFT-S-OFDM waveform is supported in uplink, then implementation is simple, but resource utilization ratio is low when multiple waveforms are needed
Solution Approach 1:
The patent makes the uplink transmission system universal by supporting both DFT-S-OFDM and CP-OFDM waveforms. The base station can configure different waveforms for different terminals or different transmission scenarios, enabling flexible resource allocation and improved utilization. Terminals can be configured with appropriate waveforms based on their capabilities and channel conditions.
Solution Approach 2:
The patent introduces dynamic waveform selection and configuration capability. The base station can dynamically configure which waveform a terminal uses for uplink transmission based on real-time requirements. This dynamic adaptation allows the system to optimize resource utilization by selecting the most appropriate waveform for each transmission scenario.
3Productivity
If pilots are transmitted in adjacent short TTIs using same symbol, then resource utilization improves, but waveform multiplexing solution is absent
Solution Approach 1:
The patent segments the uplink transmission resources by introducing different pilot patterns for different waveforms. CP-OFDM uses frequency-domain comb-based pilot patterns while DFT-S-OFDM uses time-domain pilot patterns. This segmentation allows multiple waveforms to share the same time-frequency resources without interference, enabling waveform multiplexing and improving resource utilization.
Data Source
AI summary
The present invention relates to the technical field of communications, and specifically relates to an uplink transmission method, terminal, and base station, used for providing a pilot frequency transmission solution for a terminal supporting an CP-OFDM waveform, and comprising: a terminal determines a frequency domain starting position of a pilot frequency, the terminal being a terminal using CP-OFDM to perform uplink transmission; on the basis of a comb-type interval and the determined frequency domain starting position, mapping the pilot frequency onto a transmission pilot frequency symbol; and sending the pilot frequency mapped onto the symbol to a base station.