OFDM Techniques for MIMO-OFDM System: A Review

Manikandan, C.; Neelamegam, P.; Divya, E.

doi:10.17485/ijst/2015/v8i22/79103

Cited by 15 publications

(3 citation statements)

References 6 publications

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“…The second group transmits using classical modulation such as QPSK. After that, the bits of each group will be assigned together to complete the steps of OFDM, such as IFFT, adding cyclic prefix (CP), and digital to analog converter (DAC) [23], [24]. The value of low power level (L) can be found according to (4) and after knowing the high power level (H) value.…”

Section: System Design Model 21 Transmitter Designmentioning

confidence: 99%

Performance analysis of coded MIMO OFDM with subcarrier power modulation

Fadhel

Harbi

2023

IJEECS

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This study investigates a new technique known as "orthogonal frequency division multiplexing with subcarrier power modulation" (OFDM-SPM) when compounded with a "multiple-input multiple-output" (MIMO) system. This combination of the two wireless technologies offers additional benefits and characteristics, such as increased spectrum efficiency (SE), increased energy efficiency (EE), and decreased transmission latency, among others. However, as compared to a traditional MIMO-OFDM system, the system's bit error rate (BER) show degradation. In this paper, turbo code is proposed as a coding technique to enhance the system performance with three-power reallocation policies (PRPs). The simulation results show that the BER and throughput performance has gotten better, where the throughput is doubled and the BER achieves about 10 dB gain by utilizing the proposed methods and compare to the classical MIMO OFDM, which makes the system more suitable for use in future wireless systems.

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Section: System Design Model 21 Transmitter Designmentioning

confidence: 99%

Performance analysis of coded MIMO OFDM with subcarrier power modulation

Fadhel

Harbi

2023

IJEECS

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“…Wavelength packet transform based OFDM (WPT-OFDM) is another technology proposed in [10], investigates the technology's performance. Simulations of dual-polarization WPT-OFDM transmission are conducted in the proximity of polarization mode dispersion (PMD) and compared with traditional Fourier transform-based optical OFDM (FT-OOFDM).…”

Section: Literature Reviewmentioning

confidence: 99%

Efficacy of Channel Estimation and Efficient use of Spectrum using Optimised Cyclic Prefix CP in MIMO OFDM

Nandi¹,

Pathak²,

Nandi³

2019

IJEAT

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The performance of MIMO-OFDM network gets affected due to problems in the channel estimation which is essential for designing receivers. The issues in MIMO are due to sizable inadequate Cyclic Prefix (CP) in admired Orthogonal frequency division multiplexing (OFDM), a massive amount of detection error and channel estimation problem occurs due to which performance delay turn out. This paper proposes a solution, its implementation and analysis of results. The article uses the BAT and Modified Flower Pollination (MFP) algorithm for optimizing the CP length. Minimum CP length gets considered to achieve better throughput for the same MFP algorithm. This algorithm has been proposed to optimize CP length to achieve minimum error rate of bit (BER) and PAPR-Peak to average power ratio, thereby maximizing the spectrum efficiency. For comparing the efficacy of optimized CP and unoptimized CP, the paper examines the results obtained on studying the performance in the spectrum. The performance of BAT and MFP algorithm are compared with each other to determine the better optimization methodology for the problem.

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“…The paper also proposes a system which is a hybrid scheme-based metric to achieve better BER performance and PAPR reduction. At the end, a comparison between the proposed metric and the metric techniques mentioned in (8) , (9) and (10) is made available for clarification. The OFDM signal is a modulation and as well a multiplexing technique that offers various advantages for transmission channels as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Design and implementation of reconfigurable DCT based adaptive PST techniques in OFDM communication system using interleaver encoder

Shivaji¹

2020

IJST

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Objectives: To propose Reconfigurable Discrete Cosine Transform (RDCT) in Orthogonal Frequency Division Multiplexing (OFDM) high speed communication system to improve efficient spectrum utilization and mitigation of jitter, selective fading effects. The adaptive PTS method reduces Inter-Carrier-Interference (ICI), Inter-Symbol-Interference (ISI), PAPR and the computational intricacy of the communication system. To analyse and compare the performance of proposed Reconfigurable method with existing conventional OFDM communication system. Methods: This proposed technique employs interleaver encoder with both PTS and adaptive PTS with the Reconfigurable Discrete Cosine Transform (RDCT) in OFDM Communication system. Finding: A case study has been carried out and the proposed method is found to be better in CCDF performance, reliability, flexibility and accuracy. To reduce the autocorrelation between every modulated data bit, Forward error Correction in comparison with the conventional OFDM communication system. Novelty: The recent high-speed communication system most commonly using Orthogonal Frequency division multiplexing (OFDM) to enhance the quality of service (QoS) and Bandwidth on demand. Even though the OFDM scheme offers many advantages the signal of OFDM consists of a noise that causes variation in the amplitude resulting in high peak to average power ratio (PAPR) and since OFDM is a multi-carrier system, it is more susceptible to signal drifts. Various methods to reduce the PAPR in OFDM signal are already proposed, in this paper, a technique called interleaver encoder-based Partial Transmit sequence (IEPTS) is reviewed and the new proposed technique employs interleaving encoder utilizing in both PTS and A-PTS with reconfigurable discrete cosine transform (RDCT) in OFDM high-speed communication system.

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OFDM Techniques for MIMO-OFDM System: A Review

Cited by 15 publications

References 6 publications

Performance analysis of coded MIMO OFDM with subcarrier power modulation

Performance analysis of coded MIMO OFDM with subcarrier power modulation

Efficacy of Channel Estimation and Efficient use of Spectrum using Optimised Cyclic Prefix CP in MIMO OFDM

Design and implementation of reconfigurable DCT based adaptive PST techniques in OFDM communication system using interleaver encoder

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