BER Performance of CDMA Pilot Interference Cancellation Receivers

Initial Phase ◽

Multiple Input Multiple Output ◽

Cdma System ◽

Gold Codes ◽

Output Code ◽

Input Multiple Output ◽

Code Division Multiple ◽

This paper describes a new approach to improve the bit error rate (BER) performance of a multiple-input multiple-output code-division multiple-access (MIMO-CDMA) system over quasi-static Rayleigh fading channels. The system considered employs robust space-time successive interference cancellation detectors and initial-phase optimized Gold codes for the improvement. The results clearly indicate that the use of initial-phase optimized Gold codes can significantly improve the BER performance of the system compared to the performance of a multiuser MIMO-CDMA system with conventional nonoptimized Gold codes. Furthermore, this performance improvement is achieved without any increase in system complexity.

Interference Cancellation for Underwater Environment

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.b1032.0782s419 ◽

2019 ◽

Vol 8 (2S4) ◽

pp. 174-176

Keyword(s):

Optical Communication ◽

Spatial Diversity ◽

Ofdm Systems ◽

Ofdm System ◽

Wireless Optical Communication ◽

Underwater Environment ◽

Mimo Ofdm ◽

Environment Regulation ◽

In this paper, Performance of MIMO-OFDM systems in underwater wireless optical communication are studied. The execution of MIMO underwater environment regulation is examined. To alleviate turbulence induced fading, spatial diversity over underwater environment link is used. Furthermore, scattering and absorption are considered in the analysis. Analytical BER computations are fundamentally the same as simulated results. Interference cancellation inclusion in OFDM system has better BER performance than conventional method. So, by IC can accomplish high BER productivity than conventional system. Moreover, simulated results demonstrate that OFDM using IC plot has better BER execution for underwater environment.

LDM-Ex-FDM: A Novel Multi-Service Transmission Scheme for the ATSC 3.0 System

Applied Sciences ◽

10.3390/app11073178 ◽

2021 ◽

Vol 11 (7) ◽

pp. 3178

Author(s):

Xianzheng Deng ◽

Xin Bian ◽

Mingqi Li

Keyword(s):

Computational Complexity ◽

Signal To Noise Ratio ◽

Core Layer ◽

Mobile Service ◽

Transmission Scheme ◽

Equal Interval ◽

High Modulation ◽

Simulation Results ◽

In order to improve system coverage performance, in this paper, a multi-service transmission scheme on the basis of the puncturing technique, namely layered division multiplexing extension frequency-division multiplexing (LDM-Ex-FDM), is proposed. The key idea of the proposed scheme is that the symbols punctured from the enhanced layer (EL) of fixed services will be independently transmitted on a certain number of subcarriers orthogonal to the LDM signal of the core layer (CL) and most of the EL. By doing so, the punctured symbols will be demodulated with a higher signal-to-noise ratio (SNR) on the receiver side and can be recovered well, thus improving the reception performance of the EL fixed services. Moreover, two puncturing strategies based on bit-interleaved coded modulation (BICM) symbols of the LDM-Ex-FDM scheme, namely equal interval symbol puncturing (EISP) and non-equal interval symbol puncturing (NEISP), are developed to improve the performance of the EL services. Simulation results are given to show that, when the puncturing rate in the LDM-Ex-FDM scheme is configured as 1/12, the performance of the fixed service can be improved by 1.8 dB, meanwhile the bit error rate (BER) performance of the mobile service is not affected. Thus, the overall system coverage performance can be improved. Furthermore, to reduce the computational complexity and the demodulation delay of fixed service carried in the EL, at the receiver, a direct interference cancellation (DIC) detector is proposed as well. Simulation results are given to show that, under high injection level and high modulation order, the proposed DIC scheme is able to achieve almost the same BER performance as that of the traditional successive interference cancellation (SIC) scheme while with lower computational complexity.

Efficient NOMA Design without Channel Phase Information using Amplitude-Coherent Detection

10.36227/techrxiv.12195999 ◽

2020 ◽

Author(s):

Arafat Al-Dweik ◽

Youssef Iraqi ◽

Mohammad Al-Jarrah ◽

E Alsusa ◽

Mohamed-Slim Alouini ◽

...

Keyword(s):

Maximum Likelihood ◽

Bit Error Rate ◽

Multiple Access ◽

Coherent Detection ◽

The Other ◽

Phase Information ◽

Multiuser Interference ◽

Alternative Approach ◽

<div>This paper presents the design and bit error rate (BER) analysis of a phase-independent non-orthogonal</div><div>multiple access (NOMA) system. The proposed NOMA system can utilize amplitude-coherent detection</div><div>(ACD) which requires only the channel amplitude for equalization purposes. In what follows, three</div><div>different designs for realizing the detection of the proposed NOMA are investigated. One is based on the</div><div>maximum likelihood (ML) principle, while the other two are based on successive interference cancellation</div><div>(SIC). Closed-form expressions for the BER of all detectors are derived and compared with the BER of</div><div>the coherent ML detector. The obtained results, which are corroborated by simulations, demonstrate that,</div><div>in most scenarios, the BER is dominated by multiuser interference rather than the absence of the channel</div><div>phase information. Consequently, the BER using ML and ACD are comparable for various cases of</div><div>interest. The paper also shows that the SIC detector is just an alternative approach to realize the ML</div><div>detector, and hence, both detectors provide the same BER performance.</div><div><br></div>

The 13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications ◽

BER performance analyses of weighted multistage non-linear parallel interference cancellation based space-time block code

10.1109/pimrc.2002.1047311 ◽

2003 ◽

Author(s):

Tao Xiaofeng ◽

Qin Haiyan ◽

Yu Zhuizhuan ◽

Huang Xiaojun ◽

Zhang Ping ◽

...

Keyword(s):

Block Code ◽

Space Time ◽

Parallel Interference Cancellation ◽

Time Block ◽

Space Time Block Code ◽

Non Linear ◽

Performance Analyses ◽

Efficient NOMA Design without Channel Phase Information using Amplitude-Coherent Detection

10.36227/techrxiv.12195999.v1 ◽

2020 ◽

Author(s):

Arafat Al-Dweik ◽

Youssef Iraqi ◽

Mohammad Al-Jarrah ◽

E Alsusa ◽

Mohamed-Slim Alouini ◽

...

Keyword(s):

Maximum Likelihood ◽

Bit Error Rate ◽

Multiple Access ◽

Coherent Detection ◽

The Other ◽

Phase Information ◽

Multiuser Interference ◽

Alternative Approach ◽

<div>This paper presents the design and bit error rate (BER) analysis of a phase-independent non-orthogonal</div><div>multiple access (NOMA) system. The proposed NOMA system can utilize amplitude-coherent detection</div><div>(ACD) which requires only the channel amplitude for equalization purposes. In what follows, three</div><div>different designs for realizing the detection of the proposed NOMA are investigated. One is based on the</div><div>maximum likelihood (ML) principle, while the other two are based on successive interference cancellation</div><div>(SIC). Closed-form expressions for the BER of all detectors are derived and compared with the BER of</div><div>the coherent ML detector. The obtained results, which are corroborated by simulations, demonstrate that,</div><div>in most scenarios, the BER is dominated by multiuser interference rather than the absence of the channel</div><div>phase information. Consequently, the BER using ML and ACD are comparable for various cases of</div><div>interest. The paper also shows that the SIC detector is just an alternative approach to realize the ML</div><div>detector, and hence, both detectors provide the same BER performance.</div><div><br></div>