Abstract
LP-FBMC (low peak-to-average power ratio filter bank multicarrier) was recently proposed to ameliorate the high peak-to-average power ratio (PAPR) issue of filter bank multicarrier (FBMC). The previous simulation study showed that LP-FBMC achieves a similar PAPR as that of single carrier frequency division multiple access (SC-FDMA) while being very robust to inter-user timing/frequency offsets. However, the simulation results that were obtained assuming the stereotyped channel model and the simple nonlinearity model of analog circuits substantially differ from the performance results in a real channel with a real transceiver. To address this, the main purpose of this work is to compare the performances of three waveforms, i.e., SC-FDMA, FBMC, and LP-FBMC, in a real uplink indoor channel. We investigate how the bit error rate (BER) performance gaps of three waveforms in the indoor channels change by the system parameters, such as the carrier frequency within sub-3.5 GHz band and the number of sub-carriers or the sub-carrier spacing, which was not found in the previous simulation study. Our investigation confirms that LP-FBMC is a suitable waveform for real indoor applications.
Highlights
The single-carrier frequency division multiple access (SC-FDMA) scheme was adopted as the uplink scheme in 4G and 5G wireless networks [1]
We intensively analysed the performance of SC-FDMA, filter bank multicarrier (FBMC), and Low PAPR FBMC (LP-FBMC) via field test using software defined radio (SDR) devices in the real indoor wireless environments
The benefits of LP-FBMC over FBMC and SC-FDMA, i.e., low peak-to-average power ratio (PAPR), and the robustness against inter-user synchronization errors were confirmed in our field test
Summary
The single-carrier frequency division multiple access (SC-FDMA) scheme was adopted as the uplink scheme in 4G and 5G wireless networks [1]. As an alternative to SC-FDMA for next-generation networks, various modulation waveforms are being considered, such as the filtered orthogonal frequency division multiplexing (f-OFDM), filter bank multicarrier (FBMC), universal filtered multicarrier (UFMC), and generalized frequency division multiplexing (GFDM) schemes Among those waveforms, FBMC has the lowest OOB emission and, inter-user interference that is caused by inter-user timing/frequency offsets can be eliminated using only one guard subcarrier. Inter-carrier interference that is caused by a multipath fading channel can be overcome without using a cyclic prefix (CP) [6,7] Because of these benefits, FBMC has been considered to be a promising candidate for multiple access schemes of next-generation communications. An enhanced version of FBMC, called LP-FBMC (low PAPR FBMC), was proposed to reduce the PAPR of the conventional FBMC by applying discrete Fourier transform (DFT) spreading with special conditions [8,9,10]
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