Analytical Expression for the Bit Error Rate of a Filtered Multitone Modulation Scheme (FMT) through a Multipath Fading Channel

2021 ◽  
Vol 19 (4) ◽  
pp. 643-651
Author(s):  
Mauricio Ramirez ◽  
Susana Molano
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Fading Channel ◽  
Multipath Fading ◽  
Modulation Scheme ◽  
Multipath Fading Channel ◽  
Analytical Expression

scholarly journals Analysis of Bit Error Rate on M-ary QAM over Gaussian and Rayleigh Fading Channel

2020 ◽  
Vol 9 (6) ◽  
pp. 482-485
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Fading Channel ◽  
Rayleigh Fading ◽  
Multipath Fading ◽  
Rayleigh Fading Channel ◽  
Signal Quality ◽  
Long Distance ◽  
Multipath Fading Channel ◽  
Modulation Techniques

Transmission of signal over long distance through the channel will result in poor signal quality reception at the receiver. The Signal quality is affected by means of fading and it can be minimized by using effective modulation techniques. Mary QAM is one of the effective modulation techniques as it has higher efficiency and effective form of modulation for data. MQAM is a modulation where data bit selects M combinations of amplitude and phase shifts that are applied to carrier. The analysis carried out based on Bit Error Rate on various M - Quadrature Amplitude Modulation schemes like 16 -QAM, 64- QAM and 256- QAM over Gaussian and Rayleigh Fading channel. The input data entered into QAM modulator then transmits over Gaussian channel and the QAM demodulator is performed at the receiver. The same process repeated over Rayleigh fading channel for M-QAM. Rayleigh fading is multipath fading channel will vary randomly according to the Rayleigh distribution. The MATLAB simulation is carried out to get experimental results on M-QAM and compared. The analysis shows that improved Bit Error Rate in 16-QAM over Gaussian and Rayleigh fading channel.

A Study on Turbo Codes and Rake Received Mixed Algorithm in Multipath Fading Environment

2013 ◽  
Vol 321-324 ◽  
pp. 2877-2882
Author(s):  
Jin Peng Wang ◽  
Qi Ming Zhu ◽  
Fan Cao ◽  
Ping Li ◽  
Nian Yu Zou
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Turbo Codes ◽  
System Performance ◽  
Fading Channel ◽  
Network Performance ◽  
Multipath Fading ◽  
Transmission Power ◽  
Multipath Fading Channel ◽  
The Impact

In this paper, a Turbo codes and Rake received mixed algorithm in multipath fading environment is proposed to solve the problems in signal reception in a fading environment of the mobile communication system. Compared to the traditional multi-path reception methods, the advantage of the algorithm can significantly improve system performance; reduce the system error rate by approximately 2.5dB. Moreover, the performance of the system will be improved a lot if the antenna power is equal. Firstly a mixed algorithm in AWGN channel and multipath fading channel is introduced and derived theoretically and then a computer simulation is carried out and the impact of various parameters on network performance is anglicized. The results show that the algorithm can effectively reduce the effects of multipath fading environment on the transmission power attenuation, lower bit error rate, and improve the effectiveness to resistance to multipath fading significantly.

scholarly journals Performance evaluation of chaotic spreading codes in massive MIMO OFDM system

2020 ◽  
Vol 13 (42) ◽  
pp. 4374-4385
Author(s):  
K Chidananda Murthy ◽  
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Communication System ◽  
Massive Mimo ◽  
Communication Systems ◽  
Multipath Fading ◽  
Modulation Scheme ◽  
Ofdm System ◽  
Spreading Factor ◽  
Mimo Ofdm

Background/Objectives: Wireless communication systems are growing towards the implementation of 5G communication systems to satisfy the demand of services in future. OFDMA has some shortcoming like one or more subcarriers of OFDM are completely affected due to the characteristic of the transmission channel. Spreading scheme has been introduced to combat the aforementioned issue. Furthermore, communication channels are affected by multipath fading which changes the amplitude of the received signal. This fading severely affects the communication systems. Therefore, it is essential to develop a more robust technique for higher data transmission and larger throughput. The main objective of this study is to design a massive MIMOOFDM system for secure transmission of data. Chaos based sequence is used to spread the data before transmission which will solve intercell interference and improve the security of data. Methods: This study presents a chaos based massive MIMO-OFDM communication system. The proposed chaos based massive MIMO-OFDM system is implemented and its efficacy is evaluated by computing bit error rate. The effectiveness of the proposed system is investigated by varying the parameters including modulation methods such as PSK and QAM, number of users 10, 20 and 30 and spreading factor of 5, 10 and 15. Findings: Results clearly proved that the proposed system provides exceptional performance with 16QAM modulation scheme, 10 users at high spreading factor value of 15. Novelty: The uniqueness of the proposed system is with enhanced performance and usage of novel modulation scheme by varying the spreading factor value, when compared to its peers. Keywords: Communication system; spreading code; chaotic code; massive MIMO-OFDM; bit error rate

scholarly journals Performances of BICM-ID system using CRSC code in optical transmissions

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Hocine Fekih ◽  
Boubakar Seddik Bouazza ◽  
Keltoum Nouri
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Iterative Decoding ◽  
Optical Transmission ◽  
Coded Modulation ◽  
Modulation Scheme ◽  
Coding Gain ◽  
Decoding Algorithms ◽  
Qam Modulation ◽  
Short Code

AbstractRecently, using iterative decoding algorithms to achieve an interesting bit error rate for spectrally efficient modulation become a necessity for optical transmission, in this paper, we propose a coded modulation scheme based on bit interleaving circular recursive systematic convolutional (CRSC) code and 16-QAM modulation. The proposal system considered as a serial concatenation of a channel encoder, a bit interleaver and M-ary modulator can be flexible easy to implement using a short code length. For a spectral efficiency $\eta =3\text{bit}/s/Hz$, the coding gain at a bit error rate of 10−6 is about 8 dB.

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