Next generation cellular networks are expected to connect billions of devices through its massive machine-type communication (mMTC) use case. To achieve this, waveforms with improved spectral confinement and high spectral efficiency compared to cyclic-prefix orthogonal division multiplexing (CP-OFDM) are required. In this paper, filter-bank muilticarrier with quadrature amplitude modulation (FBMC-QAM) is studied as an alternative to CP-OFDM for such applications. However, FBMC-QAM presents the challenge of high intrinsic interference due to the loss of complex orthogonality in time-frequency domain. Bit-interleaved coded modulation with iterative decoding (BICM-ID) has been shown to exhibit capacity-approaching decoding performance. Therefore, in this paper, an iterative interference cancellation (IIC) based BICM-ID receiver is designed to cancel the intrinsic interference in FBMC-QAM systems. The proposed receiver consist of an inner decoder, which combines iterative demodulation and interference cancellation, and an outer decoder which is a low density parity check (LDPC) channel decoder. To evaluate the convergence behaviour of the proposed receiver, extrinsic information transfer (EXIT) chart analysis is employed, where EXIT curves for the components of the iterative decoder are derived. Numerical results show that the intrinsic interference in FBMC-QAM systems can be removed by adopting the proposed IIC-based BICM-ID receiver. With a receiver that is able to successfully cancel intrinsic interference, FBMC-QAM becomes an interesting alternative waveform for asynchronous mMTC applications due to its superior frequency localization compared to CP-OFDM. Furthermore, it has been shown that FBMC-QAM with the IIC-based receiver can achieve similar bit-error-rate (BER) performance as a CP-OFDM benchmark under different fading channels. Finally, the complexity of the proposed receiver for FBMC-QAM is analysed and compared to the complexity of the CP-OFDM benchmark.

中文翻译：

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基于IIC的FBMC-QAM系统的BICM-ID接收机的设计和收敛性分析

下一代蜂窝网络有望通过其庞大的机器类型通信（mMTC）用例连接数十亿个设备。为此，需要与循环前缀正交划分多路复用（CP-OFDM）相比具有改善的频谱限制和更高的频谱效率的波形。在本文中，研究了正交幅度调制的滤波器组多载波（FBMC-QAM）作为此类应用中CP-OFDM的替代方案。然而，由于时频域中复杂正交性的丧失，FBMC-QAM面临着高固有干扰的挑战。具有迭代解码的比特交织编码调制（BICM-ID）已显示出具有逼近容量的解码性能。因此，在本文中，基于迭代干扰消除（IIC）的BICM-ID接收器旨在消除FBMC-QAM系统中的固有干扰。拟议的接收机包括一个内部解码器和一个外部解码器，内部解码器结合了迭代解调和干扰消除功能，外部解码器是低密度奇偶校验（LDPC）信道解码器。为了评估所提出的接收器的收敛行为，采用了外部信息传输（EXIT）图分析，其中得出了迭代解码器组件的EXIT曲线。数值结果表明，采用建议的基于IIC的BICM-ID接收机可以消除FBMC-QAM系统中的固有干扰。使用能够成功消除内在干扰的接收器，FBMC-QAM由于与CP-OFDM相比具有优越的频率定位能力，因此成为异步mMTC应用的一种有趣的替代波形。此外，已经表明，具有基于IIC的接收机的FBMC-QAM在不同的衰落信道下可以实现与CP-OFDM基准相似的误码率（BER）性能。最后，分析了针对FBMC-QAM提出的接收机的复杂度，并将其与CP-OFDM基准测试的复杂度进行了比较。