Analysis and rate optimization of GFDM‐based cognitive radios

Mohammadian, Amirhossein; Baghani, Mina; Tellambura, Chintha

doi:10.1002/ett.3435

Cited by 6 publications

(4 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Practical RF impairments and active SI cancellation in both analog and digital domain for fullduplex transceivers should be considered. Furthermore, this exact system model but for the half-duplex GFDM was studied in [19], [35]. These works developed an optimal power allocation for maximizing the secondary sum rate.…”

Section: A Problem Tackled In This Workmentioning

confidence: 99%

“…While there are several cognitive radio modes, the simplest option is to allow secondary users (SUs) to access a spectrum hole [18]. A spectrum hole is an unused frequency band at a specific time or location in which primary users (PUs) are not transmitting [19]. In this work, we integrate the above three technologies; namely full-duplex GFDM transceivers operating over a spectrum hole.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Cognitive GFDM Full-Duplex Radios With RF Impairments and ACI Constraints

Mohammadian

Tellambura

2020

IEEE Open J. Commun. Soc.

Self Cite

View full text Add to dashboard Cite

We investigate the problem of sum-rate maximization of a secondary link of full-duplex generalized frequency division multiplexing (GFDM) radios operating over a spectrum hole, which is surrounded by two active primary adjacent channels. Thus, the secondary transmissions must be below an adjacent channel interference (ACI) threshold. In-band distortions and several interference terms are also caused by phase noise, in-phase (I) and quadrature (Q) imbalance, carrier frequency offset (CFO) and the nonlinear power amplifier (PA). Analog domain and digital domain self-interference (SI) cancellation is also considered. We study the two cases of two independent oscillators for local transmitter and receiver and one common shared oscillator. We derive the powers of residual SI, desired signal, interference signal and noise, signal-to-interference-plus noise ratio (SINR) and the power spectral density (PSD) of the transmit signal. By using successive convex approximations, we solve the sum-rate maximization problem. Finally, we show that in full-duplex radios under certain RF impairments, GFDM may double the sum rate compared to that of orthogonal frequency division multiplexing (OFDM). INDEX TERMS Full-duplex radios, generalized frequency division multiplexing (GFDM), cognitive radio, spectrum hole, radio frequency (RF) impairments, rate optimization.

show abstract

Section: A Problem Tackled In This Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cognitive GFDM Full-Duplex Radios With RF Impairments and ACI Constraints

Mohammadian

Tellambura

2020

IEEE Open J. Commun. Soc.

Self Cite

View full text Add to dashboard Cite

show abstract

“…In recent two decades, generalized frequency division multiplexing (GFDM) has been received increasing attention as the most suitable waveform supporting the requirements of next-generation wireless systems, which achieves lower out-of-band (OOB) emission, higher spectral efficiency, and stronger robustness against time and frequency offsets than orthogonal frequency division multiplexing (OFDM). 1,2 However, GFDM systems still suffer from some drawbacks such as inherent self-interference due to nonorthogonality arising from GFDM prototype filters, 3,4 and the high peak-to-average power ratio (PAPR) due to randomly coherent superposition of modulated subcarriers in multi-carrier modulation schemes. 5,6 In the case of the latter problem, several PAPR reduction approaches have been proposed to overcome this difficulty of various multi-carrier schemes such as References 7-11.…”

Section: Introductionmentioning

confidence: 99%

Linear precoder design for peak‐to‐average power ratio reduction of generalized frequency division multiplexing signal using gradient descent methods

Sheikh‐Hosseini

Hasheminejad

Rahdari

2022

Trans Emerging Tel Tech

View full text Add to dashboard Cite

This article addresses linear precoder design for the peak‐to‐average power ratio (PAPR) reduction of the generalized frequency division multiplexing (GFDM) scheme. This design relies on minimizing various statistical parameters of the instantaneous power of the GFDM signal—including variance, second and third moments—using gradient‐based optimization methods. In this regard, a general framework of four different scenarios, which employs the steepest descent and conjugate‐gradient methods and utilizes two different approaches of fixed and dynamic step‐sizing, is proposed. In the case of fixed step‐sizing, the results demonstrate that the algorithm diverges in some scenarios and provides low‐speed convergence for the others due to its inability in meeting the terminating threshold regarding minimizing objective function to a desirable level. However, dynamic step‐sizing using the Wolf line search rule circumvents these drawbacks, outperforms the existing research, and converges in all scenarios to a precoder providing advantages in terms of design speed and achievable PAPR, while keeping the symbol error rate and out‐of‐band emissions at the ranges of the un‐precoded GFDM systems. Moreover, the results confirm the comprehensiveness of the proposed framework in adapting to various GFDM statistical parameters and gradient methods.

show abstract

“…Optimal filter design for a GFDM transceiver in presence of CFO is presented in [14]. GFDM performance in cognitive radio is studied in [15], [16] and effects of the nonlinear power amplifier are investigated for that. Digital interference cancellation scheme for an FD GFDM transceiver is proposed in [17] and SI power is calculated as well.…”

Section: Introductionmentioning

confidence: 99%

Full-Duplex GFDM Radio Transceivers in the Presence of Phase Noise, CFO and IQ Imbalance

Mohammadian

Tellambura

2019

ICC 2019 - 2019 IEEE International Conference on Communications (ICC)

Self Cite

View full text Add to dashboard Cite

This paper addresses the performance of a fullduplex (FD) generalized frequency division multiplexing (GFDM) transceiver in the presence of radio frequency (RF) impairments including phase noise, carrier frequency offset (CFO) and inphase (I) and quadrature (Q) imbalance. We study analog and digital self-interference (SI) cancellation and develop a complementary SI suppression method. Closed-form solutions for the residual SI power and the desired signal power and signalto-interference ratio (SIR) are provided. Simulation results show that the RF impairments degrade SI cancellation and FD GFDM is more sensitive to them compares to FD orthogonal frequency division multiplexing (OFDM). Hence, we propose an FD GFDM receiver filter for maximizing the SIR. Significantly, it achieves 25 dB higher SIR than FD OFDM transceiver.Index Terms-Full-duplex radios, generalized frequency division multiplexing (GFDM), radio frequency (RF) impairments, signal-to-interference ratio (SIR), filter design.

show abstract

Analysis and rate optimization of GFDM‐based cognitive radios

Cited by 6 publications

References 40 publications

Cognitive GFDM Full-Duplex Radios With RF Impairments and ACI Constraints

Cognitive GFDM Full-Duplex Radios With RF Impairments and ACI Constraints

Linear precoder design for peak‐to‐average power ratio reduction of generalized frequency division multiplexing signal using gradient descent methods

Full-Duplex GFDM Radio Transceivers in the Presence of Phase Noise, CFO and IQ Imbalance

Contact Info

Product

Resources

About