Abstract In the generalized frequency division multiplexing (GFDM) technique, non-orthogonal pulse shapes are used to transmit data symbols on both time and frequency. This procedure causes self-interference among transmitted symbols. Recently, a modified version of GFDM, coded GFDM (CGFDM), has been introduced in which the transmitter matrix is unitary, avoiding the noise enhancement during self-interference cancellation. In this paper, we generalize the CGFDM for the multiuser uplink transmission scenario, and develop a zero-forcing (ZF) receiver to detect the data of multiple users. Simulation results show that the proposed ZF receiver outperforms the conventional ZF based generalized frequency division multiple access (GFDMA) receiver when the prototype filters are less localized and the number of subsymbols is high; however, with an increase in computational complexity. Moreover, a receiver with remarkably lower computational complexity is proposed based on the unitarity of the transmitter matrix in CGFDM and the assumption of relatively low frequency selectivity of the communication channels. This low-complexity receiver provides the same bit error rate (BER) performance of the ZF receiver in the low to mid range SNRs.

中文翻译：

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编码 GFDMA 系统的上行收发器设计

摘要 在广义频分复用（GFDM）技术中，非正交脉冲波形用于在时间和频率上传输数据符号。该过程导致传输符号之间的自干扰。最近，引入了 GFDM 的修改版本，即编码 GFDM (CGFDM)，其中发射机矩阵是单一的，避免了自干扰消除期间的噪声增强。在本文中，我们将 CGFDM 推广到多用户上行传输场景，并开发了一种迫零 (ZF) 接收器来检测多用户的数据。仿真结果表明，当原型滤波器较少局部化且子符号数量较多时，所提出的 ZF 接收器优于传统的基于 ZF 的广义频分多址 (GFDMA) 接收器；然而，随着计算复杂度的增加。此外，基于 CGFDM 中发射机矩阵的单一性和通信信道频率选择性相对较低的假设，提出了一种具有显着较低计算复杂度的接收机。这种低复杂度接收器在中低范围 SNR 中提供与 ZF 接收器相同的误码率 (BER) 性能。