A Novel ZF-Based MAI Cancellation Scheme in the Time Domain for SC-FDMA System

2013 ◽  
Vol 427-429 ◽  
pp. 2432-2435
Author(s):  
Yu Lei Zhang ◽  
Tian Yuan Zhang ◽  
Shu Xin Guo
Keyword(s):  
Time Domain ◽  
Carrier Frequency ◽  
Multiple Access ◽  
Carrier Frequency Offset ◽  
Frequency Division ◽  
Single Carrier ◽  
Error Ratio ◽  
Bit Error Ratio ◽  
The Time Domain ◽  
Multi Access

Similar to the orthogonal frequency division multiple access (OFDMA) system, the carrier frequency offset (CFO) is a challenging problem in the single carrier frequency division multiple access (SC-FDMA) system, which can destroy the orthogonality among the subcarriers. As a consequence, multi-access interference (MAI) along with serious performance degradation will be induced. In this paper, a zero forcing (ZF)-based MAI cancellation scheme is proposed. Compared with other cancellation schemes, the proposed one mitigates the interferences in the time domain instead of the frequency domain. Simulation results show that the proposed method can significantly reduce the degradation and enhance the Bit Error Ratio (BER) performance.

scholarly journals Eigenvalue Decomposition Precoded Faster-Than-Nyquist Transmission of Index Modulated Symbols

2021 ◽  
Author(s):  
Prakash Chaki ◽  
Takumi Ishihara ◽  
Shinya Sugiura
Keyword(s):  
Time Domain ◽  
Eigenvalue Decomposition ◽  
Single Carrier ◽  
Error Ratio ◽  
Nyquist Criterion ◽  
Bit Error Ratio ◽  
Personal Use ◽  
Constrained Capacity ◽  
Criterion Time ◽  
Ieee International Symposium

Postprint accepted on 30 April 2021 for publication in IEEE International Symposium on Information Theory (ISIT), 2021. (c) 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.<div>In this paper, we propose a precoded faster-than-Nyquist (FTN) signaling technique for time-domain single-carrier index modulated (IM) symbol transmission. More precisely, eigenvalue decomposition precoding is adopted for the FTN transmission of data bits modulated by single-carrier time-domain IM. While the FTN scheme increases the spectral efficiency and data rate by packing more transmit symbols per block duration than those defined in the Nyquist criterion, time-domain IM works towards the same objective while maintaining symbol sparsity. We analytically derive the constrained capacity of the proposed system. Our simulation results show that the proposed scheme has better bit error ratio (BER) performance over the conventional FTN-IM scheme, particularly for the scenario of a higher packing ratio. In the proposed scheme, $2.5$-dB performance gain is observed at the BER of 10<sup>-4</sup>, employing the packing ratio of $0.7$ and the roll-off factor of $0.5$ in a channel-uncoded scenario.<br></div>

scholarly journals Performance analysis of OFDMA and SC-FDMA

2017 ◽  
Vol 8 (2) ◽  
pp. 113-116 ◽  
Author(s):  
M. Al-Rawi
Keyword(s):  
Carrier Frequency ◽  
Orthogonal Frequency Division Multiplexing ◽  
Multiple Access ◽  
High Speed ◽  
Minimum Mean Square Error ◽  
Frequency Division ◽  
International Telecommunication Union ◽  
Single Carrier ◽  
Main Challenge ◽  
Better Than

The main challenge in any high-speed digital communication system is how to maximize the data rate with minimizing the bit error rate. Several techniques have been developed to achieve this point. Some of these techniques are orthogonal frequency division multiplexing (OFDM), single-carrier frequency domain equalization (SC-FDE), orthogonal frequency division multiple access (OFDMA), and single-carrier frequency division multiple access (SC-FDMA). These four techniques are described briefly in this paper. Also, the paper measures the performances of OFDMA and SC-FDMA systems over international telecommunication union (ITU) vehicular-A channel using minimum mean square error (MMSE) equalization. Simulation results show that the performances with interleaved mapping outperform that with localized mapping. Also, the performances with quadrature phase shift keying (QPSK) are better than that with 16-ary quadrature amplitude modulation (16QAM). In addition, the performance of SC-FDMA is better than that of OFDMA, when QPSK is used, but the latter is little bit better than that of SC-FDMA when 16QAM is used.

Sign in / Sign up

Export Citation Format

Share Document