SC-FDE

About: SC-FDE is a research topic. Over the lifetime, 438 publications have been published within this topic receiving 7547 citations.

Performance of MIMO single-carrier frequency domain zero-forcing equalizer

Abstract: Single-carrier frequency domain equalization (SC-FDE) has many advantages, but in the MIMO frequency selective channel its performance has not been fully characterized and several important open questions remain. This paper analyzes the diversity of zero-forcing MIMO SC-FDE. It is shown that the diversity of the ZF receiver over this channel is the same as that of the ZF receiver in the frequency-flat channel. To improve the performance, a lattice-reduction (LR) aided ZF equalization is proposed and analyzed. It is shown that the full spatial and temporal diversity is achieved by he LR-aided ZF receiver for the uncoded transmission. This is the first analytical proof for the LR-aided equalization for MIMO frequency selective channel.

SC-FDE with OQPSK-Type Schemes: An Efficient Transmission Technique for Broadband Wireless Systems

Abstract: This paper considers frequency-domain re- ceiver design for OQPSK-type schemes. Since the I-Q interference can lead to significant performance degra- dation we propose an FDE design (Frequency-Domain Equalization) where there is no I-Q interference in the sampling instants for the predominant OQPSK constella- tion. We also propose iterative FDEs with I-Q interference cancelation, as well as the cancelation of unintended OQPSK components.

Hybrid STT/ERT and SC-FDE technique for single carrier transmission with a guard period

Abstract: This paper proposes a hybrid shortened transmission/expanding reception technique and single carrier modulation with a zero forcing frequency domain equalizer when a single carrier modulation with a guard period is transmitted. Regarding single carrier transmission data as shortened OFDM transmission data allows an expanding reception technique and a maximum ratio to be combined in the receiver, and a parallel single carrier modulation with a frequency domain equalizer is used as a secondary receiver. The proposed hybrid scheme does not have channel codec but simulation results show it has better performances in comparison with the coded OFDM algorithm at the expense of algebraic calculations and FFT executions.

An Efficient QAM Detection via Nonlinear Post-distortion for SC-FDE Transmission under PA Impairments with Memory.

Abstract: In this paper, we propose a novel receiver structure for single carrier transmission with frequency domain equalization (FDE) that is exposed to power amplifier (PA) nonlinearities. A two stage approach is adopted, in which linear communication channel is equalized at first stage and it is followed by a post-distortion unit where nonlinear distortion is reduced. In literature, there are some techniques that are proposed for the memoryless compensation of nonlinear distortion together with FDE. However, in this study, we show that even if a memoryless nonlinearity is utilized, received signal is impaired by nonlinear inter-symbol interference (ISI). Therefore, we propose a class of post-distortion techniques, which use neighbouring received symbols to supress the nonlinear interference. Two different, post-distortion techniques, namely Gaussian process regression (GPR) and neural network (NN) based post-distorters, are considered. In addition, a receiver structure, combining outputs of fractional delayed bank of FDE's, is proposed to overcome performance degradation problem of FDE for highly frequency selective channels under nonlinear distortion. Performance of the proposed techniques are compared with that of the state-of-the-art techniques in terms of bit error rate (BER) and achievable information rate (AIR) metrics via simulations. Simulation results demonstrate that GPR and NN based post-distortion methods outperform state-of-the-art techniques. Lastly, it is observed that proposed receiver architecture performs very close to linear system with the help of proposed fractionally delayed FDE bank.