Performance analysis of relay‐multiplexing scheme in cellular systems employing massive multiple‐input multiple‐output antennas

Akhlaq, Assad; Sulyman, Ahmed Iyanda; Hassanein, Hossam S.; Alsanie, Abdulhameed; Alshebeili, Saleh A.

doi:10.1049/iet-com.2013.1000

Cited by 8 publications

(2 citation statements)

References 23 publications

(31 reference statements)

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“…Microwave photonic filters (MPF) have attracted much research attention due to their advantages such as large bandwidth, low loss, immunity to electromagnetic interference, good tunability and reconfigurability and so on, which are difficult to be achieved with traditional electronic technology [1][2][3][4][5]. Fifth generation (5G) cellular systems are required to provide gigabit wireless data rate, supporting bandwidth-intensive applications such as streaming and cloud computing, on mobile devices [6].…”

Section: Introductionmentioning

confidence: 99%

Microwave Photonic Filter by Using Recirculating Frequency Shifter to Generate Optical Frequency Comb

et al. 2021

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In this paper, a continuously tunable microwave photonic filter (MPF) with optical frequency comb (OFC) generated by recirculating frequency shifter (RFS) based on an inphase/quadrature (I/Q) modulator is proposed and experimentally demonstrated. A chirped fiber Bragg grating (CFBG) is inserted into the RFS loop to act as an optical bandpass filter. The central frequencies of two passbands of the MPF in 20 GHz range have been tuned linearly from 7.67 GHz to 9.04 GHz, and 15.34 GHz to 18.03 GHz, respectively by changing the frequency of the driving microwave signal onto the I/Q modulator from 20 GHz to 17 GHz. When the frequency of the driving microwave signal is decreased, OFC with smaller tone spacing is generated, and then the MPF's passbands move to higher frequency. So that, the proposed MPF's passbands with high frequencies can be achieved by applying driving microwave signal with low frequency to generate the OFC. By varying the bandwidth of the CFBG, the number of comb lines can be changed, which results in different bandwidth of the MPF's passband. Furthermore, in our experiment by carefully adjusting bias voltage of the Mach-Zenhder modulator, when the frequencies of driving microwave signal onto the I/Q modulator is 20 GHz and 18 GHz, one passband in the 20 GHz range can be suppressed at the frequency of 15.34 GHz, and 8.52 GHz, respectively.

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Section: Introductionmentioning

confidence: 99%

Microwave Photonic Filter by Using Recirculating Frequency Shifter to Generate Optical Frequency Comb

et al. 2021

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“…Massive multiuser multiple input multiple output (MIMO) systems have gained significant research attentions lately because they provide significant boost in the capacity of MIMO systems [1][2][3]. Multiuser MIMO systems have been investigated for long time now.…”

Section: Introductionmentioning

confidence: 99%

Spatial Modulation Concept for Massive Multiuser MIMO Systems

Humadi¹,

Sulyman

Alsanie³

2014

International Journal of Antennas and Propagation

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This paper presents the concept of spatial modulation (SM) scheme for massive multiuser MIMO (MU-MIMO) system. We consider a MU-MIMO system whereKusers, each equipped with multiple antennas, are jointly serviced by a multiantenna base station transmitter (BSTx) using appropriate precoding scheme at the BSTx. The main idea introduced here is the utilization of the user’s subchannel index corresponding to the precoding matrix used at the BSTx, to convey extra useful information. This idea has not been explored, and it provides significant throughput enhancements in a multiuser system with large number of users. We examine the performance of the proposed scheme by numerical simulations. The results show that as the number of users and the receiving antennas for each user increase, the overall system throughput gets better, albeit at the cost of some degradation in the BER performance due to interantenna interference (IAI) experienced at the receiver. We then explore zero-padding approach that helps to remove these IAI, in order to alleviate the BER degradations.

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