Abstract
This paper proposes intersymbol interference (ISI) and interblock interference (IBI) cancellation schemes at the transmitter and the receiver for the single-carrier block transmission with insufficient cyclic prefix (CP). The proposed scheme at the transmitter can exterminate the interferences by only setting some signals in the transmitted signal block to be the same as those of the previous transmitted signal block. On the other hand, the proposed schemes at the receiver can cancel the interferences without any change in the transmitted signals compared to the conventional method. The IBI components are reduced by using previously detected data signals, while for the ISI cancellation, we firstly change the defective channel matrix into a circulant matrix by using the tentative decisions, which are obtained by our newly derived frequency domain equalization (FDE), and then the conventional FDE is performed to compensate the ISI. Moreover, we propose a pilot signal configuration, which enables us to estimate a channel impulse response whose order is greater than the guard interval (GI). Computer simulations show that the proposed interference cancellation schemes can significantly improve bit error rate (BER) performance, and the validity of the proposed channel estimation scheme is also demonstrated.
Highlights
A block transmission with cyclic prefix (CP), including orthogonal frequency division multiplexing (OFDM) [1, 2] and single-carrier block transmission with the CP (SC-CP) [3, 4], has been drawing much attention as a promising candidate for the 4G (4th generation) mobile communications systems
This means that the CP operation converts a Toeplitz channel matrix into a circulant matrix, the intersymbol interference (ISI) of the received signal can be effectively equalized by a discrete frequency domain equalizer (FDE) using fast Fourier transform (FFT)
We can see that the proposed scheme can improve the bit error rate (BER) performance significantly at the cost of transmission rate, while the performance of the SC-CP system without the proposed scheme is degraded due to the ISI and the interblock interference (IBI) caused by the insufficient guard interval (GI)
Summary
A block transmission with cyclic prefix (CP), including orthogonal frequency division multiplexing (OFDM) [1, 2] and single-carrier block transmission with the CP (SC-CP) [3, 4], has been drawing much attention as a promising candidate for the 4G (4th generation) mobile communications systems. Note that there is a common point among the proposed method with the second approach and the methods proposed in [15,16,17,18] in the sense that all these methods utilize a certain estimate of the interference due to the insufficient GI in order to obtain the same received signal model as the conventional block transmission system with the CP. The work [15] has been proposed for multicarrier transmission and is applied to the SC-CP system in [16], while the iterative processing is required in order to obtain good performance because of the different nature of the interference between the multicarrier and the single-carrier signals.
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