scholarly journals Comparing f-OFDM and OFDM Performance for MIMO Systems Considering a 5G Scenario

2019 ◽  
Author(s):  
Felipe Augusto Pereira de Figueiredo ◽  
Nathália F. T. Aniceto ◽  
Jorge Seki ◽  
Ingrid Moerman ◽  
Gustavo Fraidenraich
Keyword(s):  
Mobile Communications ◽  
Orthogonal Frequency Division Multiplexing ◽  
Error Probability ◽  
Mimo Systems ◽  
Radio Spectrum ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Primary Users ◽  
Band Emission ◽  
Spectral Localization

The advances mobile communications has seen in recent years has rendered the radio spectrum a limited and, hence, an expensive resource. Therefore, technologies that support unlicensed access to spectrum are needed. Therefore, the adoption of novel modulation schemes becomes of utmost importance to obtain better spectral-localization and reduce the OOBE (\textit{Out of Band Emission}) inherent to OFDM (\textit{Orthogonal Frequency Division Multiplexing}) and, consequently, mitigating the interference between secondary (\textit{unlicensed}) and primary users. In this scenario, we assess the gain in the bit error probability using f-OFDM (\textit{filtered-OFDM}) in MIMO systems, both used in the 5G RANGE project.

scholarly journals Comparing f-OFDM and OFDM Performance for MIMO Systems Considering a 5G Scenario

2019 ◽  
Author(s):  
Felipe Augusto Pereira de Figueiredo ◽  
Nathália F. T. Aniceto ◽  
Jorge Seki ◽  
Ingrid Moerman ◽  
Gustavo Fraidenraich
Keyword(s):  
Mobile Communications ◽  
Orthogonal Frequency Division Multiplexing ◽  
Error Probability ◽  
Mimo Systems ◽  
Radio Spectrum ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Primary Users ◽  
Band Emission ◽  
Spectral Localization

The advances mobile communications has seen in recent years has rendered the radio spectrum a limited and, hence, an expensive resource. Therefore, technologies that support unlicensed access to spectrum are needed. Therefore, the adoption of novel modulation schemes becomes of utmost importance to obtain better spectral-localization and reduce the OOBE (\textit{Out of Band Emission}) inherent to OFDM (\textit{Orthogonal Frequency Division Multiplexing}) and, consequently, mitigating the interference between secondary (\textit{unlicensed}) and primary users. In this scenario, we assess the gain in the bit error probability using f-OFDM (\textit{filtered-OFDM}) in MIMO systems, both used in the 5G RANGE project.

scholarly journals APR Reduction Technique based on OFDM Pilot Filter Bank Limiting for Satellite Mobile Communications

2018 ◽  
Vol 246 ◽  
pp. 03002
Author(s):  
Tianfang Dai
Keyword(s):  
Mobile Communications ◽  
Bit Error Rate ◽  
Error Rate ◽  
Orthogonal Frequency Division Multiplexing ◽  
Filter Bank ◽  
Hardware Implementation ◽  
Reduction Technique ◽  
Papr Reduction ◽  
Frequency Division Multiplexing ◽  
Frequency Division

Combined with OFDM (Orthogonal Frequency Division Multiplexing), satellite mobile communications will effectively achieve on-demand communication in areas with an ultra-low density of users. With OFDM multiple access optimization, the bandwidth utilization efficiency can be increased by 5 to 10 times. However, satellites are power-constrained systems, so higher PAPR requires greater power backoff, resulting in a decline in satellite transmission capacity. To use OFDM technology in satellites, there are problems such as reduced transmission capacity resulted from high PAPR, complication of lowering PAPR, and difficulty in hardware implementation. In order to deal with the problem of high bit error rate and hardware implementation difficulties in PAPR reduction technique of non-orthogonal frequency division multiplexing, this paper proposes a limiting PAPR reduction technique with OFDM pilot filter banks for satellite mobile communications. Firstly, the applicability of OFDM in satellite mobile communications is analyzed, and the influence of high PAPR on satellite power utilization and the influence of frequency shift sensitivity on inter-satellite communication interference are obtained. Then design the PAPR reduction technique based on the pilot filter bank. By setting the tunable filter bank to the pilot, the sideband power suppression in the OFDM frequency domain is realized, and the PAPR of the OFDM signal is reduced. Finally, the experimental results show that the PAPR performance is improved by 3dB without reducing the bit error rate.

Non-linear companding scheme for peak-to-average power ratio (PAPR) reduction in generalized frequency division multiplexing

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Shiv Om Tiwari ◽  
Rajeev Paulus
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Average Power ◽  
Frequency Division Multiplexing ◽  
Power Ratio ◽  
Frequency Division ◽  
Mobile Phone Technology ◽  
Time Frequency ◽  
Band Emission ◽  
Non Linear ◽  
Papr Performance

AbstractDue to the evolution of mobile phone technology which enables the use of Internet, the demand for data rates has increased tremendously. Therefore, current 4G-LTE (long-term evolution) technology needs to be replaced in near future. Hence, currently possible solutions for 5G technology are heavily investigated. Generalized frequency division multiplexing (GFDM) is one such technique which is based on multi-carrier filters and uses time-frequency structure to optimize delay and out-of-band emission (OOB). Still GFDM is very much similar to orthogonal frequency division multiplexing (OFDM) with much improved spectral and peak-to-average power ratio (PAPR) performance. This paper presents a detailed description of GFDM technique, along-with its comparison to OFDM method. This paper further investigates the non-linear companding scheme which can be used to further reduce PAPR. Simulation results are presented to obtain (Power Spectral Density) PSD and PAPR performance.

scholarly journals Filtered-Orthogonal Frequency Division Multiplexing Technique for 5th Generation Mobile Communication

2019 ◽  
Vol 8 (12) ◽  
pp. 3763-3767
Keyword(s):  
Mobile Communication ◽  
Orthogonal Frequency Division Multiplexing ◽  
Low Latency ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Band Emission ◽  
Verbal Exchange ◽  
Overall Performance ◽  
5G Systems ◽  
Modulation Schemes

The imminent 5G cellular verbal exchange machine is expected to own excessive facts fees, low latency and support a massive range of devices. Except for this, gadget type communiqué is anticipated to be treated by way of 5G gadget in a very better and within your means approach. For this reason, forms of waveform applicants are projected. F-OFDM is a few of the projected applicants for 5G systems that extremely resembles to its precursor it's OFDM. The important difference among the two multi carrier waveforms is that the use of a well-designed clear out. F-OFDM as compared with OFDM so provides reduced out of band emission that allows it to utilize the allocated spectrum expeditiously. This analysis paper presents F-OFDM overall performance with absolutely different modulation schemes like QPSK, 16QAM, 64QAM and 256QAM techniques using MATLAB.

scholarly journals Two-Step Multiuser Equalization for Hybrid mmWave Massive MIMO GFDM Systems

Electronics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 1220 ◽  
Author(s):  
Joumana Kassam ◽  
Manar Miri ◽  
Roberto Magueta ◽  
Daniel Castanheira ◽  
Pedro Pedrosa ◽  
...  
Keyword(s):  
Mobile Communications ◽  
Orthogonal Frequency Division Multiplexing ◽  
Analytical Approach ◽  
Hybrid Approach ◽  
Average Power ◽  
Low Complexity ◽  
Base Station ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Digital Architecture

Although millimeter-wave (mmWave) and massive multiple input multiple output (mMIMO) can be considered as promising technologies for future mobile communications (beyond 5G or 6G), some hardware limitations limit their applicability. The hybrid analog-digital architecture has been introduced as a possible solution to avoid such issues. In this paper, we propose a two-step hybrid multi-user (MU) equalizer combined with low complexity hybrid precoder for wideband mmWave mMIMO systems, as well as a semi-analytical approach to evaluate its performance. The new digital non-orthogonal multi carrier modulation scheme generalized frequency division multiplexing (GFDM) is considered owing to its efficient performance in terms of achieving higher spectral efficiency, better control of out-of-band (OOB) emissions, and lower peak to average power ratio (PAPR) when compared with the orthogonal frequency division multiplexing (OFDM) access technique. First, a low complexity analog precoder is applied on the transmitter side. Then, at the base station (BS), the analog coefficients of the hybrid equalizer are obtained by minimizing the mean square error (MSE) between the hybrid approach and the full digital counterpart. For the digital part, zero-forcing (ZF) is used to cancel the MU interference not mitigated by the analog part. The performance results show that the performance gap of the proposed hybrid scheme to the full digital counterpart reduces as the number of radio frequency (RF) chains increases. Moreover, the theoretical curves almost overlap with the simulated ones, which show that the semi-analytical approach is quite accurate.

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