Performance Evaluation of SFBC MIMO–OFDM Using FrFT Under TWDP Fading Channel

Chawla, Tanvi; Kansal, Ankush

doi:10.1007/s11277-018-6072-z

Cited by 4 publications

(2 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Instantaneous SNR is γ k = γ s | H k | l ; H K is independent and identically distributed Jakes' model based Rayleigh faded channel, | H k | l is chi‐square pdf with l degree of freedom. For FrFT, | H α ( k )| l is chi‐square distribution; in this case, it has been investigated that the expectation of chi‐square pdf of fractional channel and Fourier channel is not exactly equal; i.e., E (| H ( k )| 2 ) ≠ E (| H α ( k )| 2 ) 22 . Consider that they differ by a factor of T which can be defined as

\frac{E ((), {(||, H_{α} ((), k))}^{2})}{E ((), {(||, H ((), k))}^{2})} = T

; the near to optimal value of α is selected for which the factor T is maximum as in equation

italicmax (||, \frac{E ({|{normalH}_{normalα} (normalk)|}^{2})}{E ({|H (normalk)|}^{2})}) = T_{α}

.…”

Section: Closed Form Bit Error Rate Expression For Multiuser Massive mentioning

confidence: 99%

Intercarrier interference analysis for massive MIMO fractional Fourier transform‐OFDM systems over time‐varying channels

Chawla

Kansal

2020

Int J Communication

View full text Add to dashboard Cite

SummaryMassive multiple‐input multiple‐output orthogonal frequency division multiplexing (MIMO‐OFDM) system is an approach to increase data rate and spectral efficiency of 5G wireless communication systems. It's easy to analyze the performance of any system with the assumption of immobile users, but if the user is moving with varying velocity, then the communication between user and base station (BS) is very difficult to maintain. Under high mobility, rapidly fading, doubly dispersive, and nonstationary environment, the conventional system fails to respond and leads to the problem of intercarrier interference (ICI). To overcome these problems, fractional Fourier transform (FrFT) has been used in place of Fourier transform (FT) to increase the correlation coefficient, to mitigate effect of ICI, and to improve bit error rate. In this paper, novel formulae for correlation coefficient, average power of ICI, and closed form bit error expression have been derived for the proposed system by considering fast‐fading model and imperfect channel state information. Finally, the comparison of both the systems conventional and proposed proved that the proposed system has improved bit error rate by 40% and intercarrier interference cancelation by 70%.

show abstract

\frac{E ((), {(||, H_{α} ((), k))}^{2})}{E ((), {(||, H ((), k))}^{2})} = T

; the near to optimal value of α is selected for which the factor T is maximum as in equation

italicmax (||, \frac{E ({|{normalH}_{normalα} (normalk)|}^{2})}{E ({|H (normalk)|}^{2})}) = T_{α}

.…”

Section: Closed Form Bit Error Rate Expression For Multiuser Massive mentioning

confidence: 99%

Intercarrier interference analysis for massive MIMO fractional Fourier transform‐OFDM systems over time‐varying channels

Chawla

Kansal

2020

Int J Communication

View full text Add to dashboard Cite

show abstract

“…In MIMO-OFDM systems, the symbols are uniformly extended to eliminate unwanted interference in the channel. 14 The presence of a cyclic prefix (CP) can transform the transmitted signal with linear convolution into cyclic convolution, so the generated transfer function is diagonalized using Fourier transform techniques on both the transmitter and receiver sides. 15 But, the system capacity gets limited; hence, the channel quality needs to be enhanced in the case of wireless networks.…”

mentioning

confidence: 99%

A novel Block Bi‐diagonalization based pre‐coding scheme for bit error reduction in mutiple input multiple output‐orthogonal frequency division multiplexing

Paul

Roy

Bhattacharjee

2023

Int J Communication

View full text Add to dashboard Cite

The MIMO-OFDM increases spectral efficiency without the use of channel state information (CSI). However, the bit error rate (BER) in the MIMO-OFDM model increases dramatically due to the increase in nonlinear distortion in the power amplifier (PA). In this research, a novel pre-coder integrated MIMO-OFDM technology is designed for effective BER reduction, and its performance is analyzed. The discrete wavelet-based OFDM system is one of the key ideas to present good orthogonal by emphasizing orthogonal wavelets. It helps to mitigate inter-symbol interference (ISI) and noise within the channel by extending the bandwidth (BW) compared to conventional OFDM systems. But, DWT-OFDM highly suffered due to downsampling, which degrades system efficiency. To overcome this, a redundant discrete wavelet transform (RDWT) is proposed in this article to enhance spectral efficiency. For modulation, 16-bit quadrature amplitude modulation (QAM) is introduced in this work. In addition to this, a block bi-diagonalization (BBD) pre-coder technique is proposed to mitigate unwanted noise and interference in the MIMO-OFDM system. The performance measures such as ergodic sum capacity, BER, throughput, average jitter noise power, mean square error (MSE), and power consumption are analyzed using the MATLAB platform. The proposed method obtains the ergodic sum capacity of 6.25 bps/Hz, a BER of 0.021, a throughput of 95.2%, MSE of À0.47, and a power consumption of 1.15 μW. The simulative results prove the efficacy of the proposed method.16-bit QAM, bit error rate reduction, block bi-diagonalization pre-coder, MIMO-OFDM, redundant discrete wavelet transform | INTRODUCTIONThe design of the future wireless system is one of the key areas of interest for researchers and scientists. 1 Nowadays, the number of users increases due to the tremendous growth of wireless applications. Hence, an effective communication system is highly required under cost and low hardware complexity. The MIMO model is one of the efficient communication systems that can integrate multiple users and allocate effective channels for smooth communication. The MIMO antenna consists of multiple transmitting and receiving antennas widely used in wireless communications

show abstract

Performance analysis of uncoded and SFBC OFDM system over composite fading channels

Shankar

Kansal

2020

Physical Communication

View full text Add to dashboard Cite

Performance Evaluation of SFBC MIMO–OFDM Using FrFT Under TWDP Fading Channel

Cited by 4 publications

References 17 publications

Intercarrier interference analysis for massive MIMO fractional Fourier transform‐OFDM systems over time‐varying channels

Intercarrier interference analysis for massive MIMO fractional Fourier transform‐OFDM systems over time‐varying channels

A novel Block Bi‐diagonalization based pre‐coding scheme for bit error reduction in mutiple input multiple output‐orthogonal frequency division multiplexing

Performance analysis of uncoded and SFBC OFDM system over composite fading channels

Contact Info

Product

Resources

About