Abstract
This paper presents the design and the experimental demonstration of transmission of spectrally efficient frequency division multiplexing (SEFDM) signals, using a single 5-GHz channel, from 81 to 86 GHz in the E-band frequency allocation. A purpose-built E-band SEFDM experimental demonstrator, consisting of transmitter and receiver GaAs microwave integrated circuits, along with a complete chain of digital signal processing is explained. Solutions are proposed to solve the channel and phase offset estimation and equalization issues, which arise from the well-known intercarrier interference between the SEFDM signal subcarriers. This paper shows the highest transmission rate of 12 Gb/s over a bandwidth varying between 2.67 to 4 GHz depending on the compression level of the SEFDM signals, which results in a spectral efficiency improvement by up to 50%, compared to the conventional orthogonal frequency division multiplexing modulation format.
Highlights
T HE continuous growth of data-hungry services pushes the current microwave spectrum toward saturation
To evaluate the system performance and prove its viability, the analysis of the system setup and results are divided into four categories: simulation results; spectral efficiency gain; the advantage of orthogonal frequency division multiplexing (OFDM) pilot over spectrally efficient frequency division multiplexing (SEFDM) pilot; and SEFDM error performance
The error performance of baseband OFDM and SEFDM signals transmission over a flat additive white Gaussian noise (AWGN) channel is simulated using the digital baseband transmitter shown in Fig. 6 and the receiver in [28]
Summary
T HE continuous growth of data-hungry services pushes the current microwave spectrum toward saturation. A new robust channel frequency response (CFR) estimation scheme for SEFDM signals was proposed in [31], and it will be experimentally demonstrated in this paper for the first time. In this estimation scheme, the pilot symbol uses the same number of subcarriers and the same frequency spacing of SEFDM signals used to transmit data, while maintaining the orthogonality. This paper, and for the first time, presents an experimental demonstration of SEFDM signal wireless transmission at a rate of 12 Gb/s over the E-band (81–86 GHz) frequency range.
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