Abstract
Filter bank multicarrier with offset quadrature amplitude modulation (FBMC-OQAM) can achieve very low out-of-band radiation and is considered to be an important candidate waveform for future communication networks. However, the synchronization sequence design and channel estimation issues are complicated in FBMC-OQAM systems owing to the pulses overlap and the intrinsic interference. In this paper, we propose a new training sequence pattern with a high bandwidth efficiency. A pilot symbol and two auxiliary data symbols are used to generate a conjugate symmetric sequence in the time domain while protecting the pilots from the intrinsic interference. Thus, channel estimation can be performed directly by the pilots, and an auto-correlation symbol timing algorithm is introduced by exploiting the conjugate symmetry property. In addition, a pulse tail truncation method is proposed to improve the bandwidth efficiency for burst-mode transmission. Finally, some numerical simulation results are presented to validate the proposed symbol timing, channel estimation, and truncation methods in various scenarios.
Highlights
In recent years, the filter bank multicarrier (FBMC) was proposed as an important candidate waveform technique to efficiently support the asynchronous and heterogeneous network scenarios expected in the future [1], e.g., massive machine-type communications [2] and cognitive radio (CR) [3]
In this paper, we aim to present a novel FBMC-OQAM training sequence pattern that can perform joint symbol timing and channel estimation with a high bandwidth efficiency
The SNR for the FBMC-OQAM is defined as E |xm,n|2 /(Pω/2) [4]
Summary
The filter bank multicarrier (FBMC) was proposed as an important candidate waveform technique to efficiently support the asynchronous and heterogeneous network scenarios expected in the future [1], e.g., massive machine-type communications (mMTC) [2] and cognitive radio (CR) [3]. One notable FBMC variant is the FBMC with offset quadrature amplitude modulation (FBMC-OQAM). Different from conventional OFDM that transmits complex-valued quadrature amplitude modulation (QAM) symbols at a given symbol rate, the FBMC-OQAM transmits real-valued pulse. Amplitude modulated (PAM) symbols at twice this symbol rate, with the orthogonality of the waveform restricted only to the real field [1]. With this type of modulation, the FBMCOQAM achieves the highest spectral efficiency of an OFDM system without the cyclic prefix while the signal maintains good time-frequency localization (TFL) [1] [6]
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