Low Complexity GFDM Receiver for Frequency-Selective Channels

Generalized frequency division multiplexing (GFDM) is a new waveform that can play an important role in some 5th generation (5G) mobile wireless networks scenarios, such as 5G for remote areas. It offers low out-of-band emission, good spectral efficiency and has the flexibility to cover the 5G requirements in remote areas applications. The GFDM receiver implementation complexity poses restrictions to the use of this powerful waveform in constrained resources devices such as the ones used in the Internet of Things (IoT). This letter proposes, an innovative frequency-domain equalizer showing complexity close to the zero-forcing (ZF) receiver while achieving performance close to the Minimum Mean Square Error (MMSE) receiver. The study also evaluates the proposed equalizer performance under frequency selective fading channel for the single-input/single-output (SISO) and multiple-input/multiple-output (MIMO) cases. The results show that with a small increment in complexity a performance gain can be obtained.