Pre-DFT RS/Data Multiplexing in Shaped MIMO DFT-s-OFDM
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Solution Overview
Problem
Existing 5G-NR communication standards face challenges in achieving extremely low latency, high data rates, and high-power efficiency due to the requirement of a two-symbol structure for data and reference symbols, which doubles latency and increases RS overhead, making it unsuitable for future 6G communications.
Innovation Solution
A method involving time-multiplexing data and reference sequences to generate a filtered-extended bandwidth DFT-s-OFDM symbol, allowing transmission in a single OFDM symbol, with optional spectrum shaping to reduce PAPR and increase power efficiency, and supporting multiple antennas or users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional DFT-S-OFDM uses separate data symbol and reference symbol transmission, then channel estimation accuracy is improved, but transmission latency is doubled and RS overhead increases to 50%
Solution Approach 1:
The patent combines reference sequences and data sequences into a single multiplexed sequence that is transmitted in one OFDM symbol. The reference sequences are embedded within the data sequence at specific positions, allowing the receiver to perform channel estimation and data detection simultaneously from the same transmitted symbol, thereby eliminating the need for separate reference symbols and reducing latency.
Solution Approach 2:
The single OFDM symbol serves multiple functions: it carries both reference information for channel estimation and data information for communication. The multiplexed sequence structure enables the same transmitted symbol to provide both channel state information and user data, making the transmission more efficient and reducing the overall number of symbols required.
2Reliability
If conventional DFT-S-OFDM uses separate data and reference symbols, then channel estimation is reliable, but RS overhead increases to 50%
Solution Approach 1:
The patent merges reference sequences with data sequences in a single multiplexed structure. By embedding reference sequences at specific positions within the data sequence and using appropriate multiplexing patterns, the system achieves reliable channel estimation while significantly reducing the proportion of resources dedicated to reference symbols compared to conventional separate transmission.
Solution Approach 2:
The patent places reference sequences at specific local positions within the multiplexed sequence where they can effectively serve the surrounding data regions. This localized placement optimizes the reference sequence distribution to provide sufficient channel estimation accuracy for adjacent data while minimizing overall reference sequence overhead.
3Loss of energy
If spectrum shaping filter is applied to filtered-extended bandwidth DFT-s-OFDM symbol, then PAPR is reduced and power efficiency is improved, but computational complexity increases
Solution Approach 1:
The patent applies spectrum shaping filters to modify the frequency domain characteristics of the DFT-s-OFDM signal. By changing the spectral parameters through filtering operations, the signal exhibits reduced peak-to-average power ratio, which improves power amplifier efficiency and reduces energy loss while maintaining the essential signal properties needed for reliable communication.
Data Source
AI summary
Embodiments of the present disclosure are related, in general to communication, but exclusively related to methods and systems methods for transmitting a waveform. The waveform is a pre-DFT RS and data multiplexed DFT-S-OFDM with excess bandwidth shaping and MIMO. Also, embodiments of the present disclosure relate to methods of detecting the received data. The method for transmitting a waveform, comprising generating, by one or more transmitters, at least one data sequence and at least one reference sequence (RS). Also, the method comprises time-multiplexing the at least one data sequence with the at least one RS, to generate a multiplexed sequence. Further, the method comprises generating a filtered-extended bandwidth DFT-s-OFDM symbol using the multiplexed sequence. The filtered-extended bandwidth DFT-s-OFDM symbol generated by the one or more transmitters is transmitted in an OFDM symbol.