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Spectral Efficiency Enhancement of FM-OFDM Waveform using Offset Modulation Techniques
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- Authors
- Gosan Noh, Wooram Shin, Kyeongpyo Kim, Hanho Wang
- Issue Date
- 2024-05
- Citation
- IEEE Wireless Communications Letters, v.13, no.5, pp.1335-1338
- ISSN
- 2162-2337
- Publisher
- IEEE Communications Society
- Language
- English
- Type
- Journal Article
- Abstract
- This letter proposes two novel modulation schemes aimed at enhancing the spectral efficiency of the frequency modulated-orthogonal frequency division multiplexing (FM-OFDM) waveform. These modulation schemes, namely amplitude offset modulation and phase offset modulation, exploit the confinement of the amplitude or phase of FM-OFDM signal. By applying different levels of amplitude or phase offset in accordance with the additional input bit, it becomes possible to transmit more data alongside the original data inherent in the FM-OFDM signal, without consuming additional wireless resources. The transmitter and receiver structures for processing amplitude and phase offset-based modulation and demodulation are also described. It is shown through simulation that the proposed amplitude and phase offset modulation schemes are quite useful to enhance the spectral efficiency of the FM-OFDM waveform while maintaining the link performance.
- KSP Keywords
- Additional input, Efficiency enhancement, Frequency modulated, Link Performance, Modulation and demodulation, Modulation scheme, OFDM signals, Orthogonal Frequency-Division Multiplexing(OFDM), Phase offset, Spectral efficiency(SE), Transmitter and receiver