NOFDM Subcarrier Squeezing for 5G Data Capacity
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Solution Overview
Problem
The orthogonal frequency-division multiplexing (OFDM) scheme in 5G communication systems has limitations on data transmission due to fixed carrier spacing, restricting the amount of data that can be transmitted per OFDM symbol.
Innovation Solution
Implementing a non-orthogonal frequency-division multiplexing (NOFDM) scheme, where the eNB identifies the use of NOFDM for downlink data transmission and reception, allowing for data transmission through either OFDM or NOFDM, with NOFDM subcarrier spacing determined based on OFDM subcarrier spacing and a squeezing factor, to increase data capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If OFDM scheme is used with fixed carrier spacing, then system reliability is maintained through orthogonal frequency allocation, but data transmission capacity is limited
Solution Approach 1:
The patent applies parameter changes by modifying the carrier spacing parameter from the fixed orthogonal spacing in OFDM to a compressed, non-orthogonal spacing in NOFDM. By changing the subcarrier spacing parameter and using a squeezing factor, the system achieves higher data transmission capacity while managing interference through parameter optimization rather than maintaining strict orthogonality.
2Productivity
If non-orthogonal frequency-division multiplexing (NOFDM) is used, then data transmission capacity is increased by allowing subcarrier spacing smaller than OFDM symbol length, but frequency resource interference increases
Solution Approach 1:
The patent manages frequency resource interference through parameter changes by optimizing the squeezing factor and subcarrier spacing. By carefully adjusting these parameters, the system achieves higher data capacity while controlling the level of interference to acceptable levels through mathematical optimization rather than eliminating interference entirely.
Solution Approach 2:
The patent converts the harmful frequency interference inherent in non-orthogonal spacing into a benefit by using sophisticated signal processing and interference management techniques. The interference is not eliminated but is instead managed and utilized within the system framework to achieve higher spectral efficiency and data capacity beyond what orthogonal spacing allows.
3Productivity
If non-orthogonal frequency-division multiplexing (NOFDM) is used, then spectral efficiency is improved, but system complexity increases due to additional signaling and coordination requirements
Solution Approach 1:
The patent reduces system complexity by designing the NOFDM framework to be compatible with existing 5G NR infrastructure. The base station and user equipment can operate in both OFDM and NOFDM modes, and the system supports dynamic switching between modes. This multi-functionality allows the system to achieve improved spectral efficiency while managing complexity through unified architecture rather than requiring completely separate systems.
Data Source
AI summary
Disclosed are: a communication technique for merging, with IoT technology, a 5G communication system for supporting a data transmission rate higher than that of a 4G system; and a system therefor. The present disclosure can be applied to intelligent services (for example, smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail, security, and safety-related services, and the like) on the basis of 5G communication technology and IoT-related technology. Disclosed are a method and an apparatus for transmitting a signal by using a non-orthogonal frequency division multiplexing (NOFDM) scheme and, particularly, the present invention presents a method and an apparatus for transmitting a control signal and a reference signal by using an OFDM scheme and for transmitting data by using the NOFDM scheme.