A Multiuser Detection Algorithm for Random Access Procedure With the Presence of Carrier Frequency Offsets in LTE Systems

Wang, Qiwei; Ren, Guangliang; Wu, Jueying

doi:10.1109/tcomm.2015.2460241

Cited by 17 publications

(6 citation statements)

References 20 publications

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“…The maximum number of SIC iterations max I is 15, which is the same to CRDSA/IRSA scheme. The predefined preamble detection threshold pre γ is 3.2, which is determined by a false alarm probability [15]. The detailed parameters can be shown in Table 1.…”

Section: Simulation Resultsmentioning

confidence: 99%

Enhancing Irregular Repetition Slotted ALOHA with Polarization Diversity in LEO Satellite Networks

Su¹,

Ren²,

Zhao³

et al. 2020

KSII TIIS

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An enhanced irregular repetition slotted ALOHA (IRSA) protocol is proposed by using polarization characteristic of satellite link and MIMO detection in low earth orbit (LEO) satellite networks, which is dubbed polarized MIMO IRSA (PM-IRSA). In the proposed scheme, one or two packets in one slot can be decoded by employing polarized MIMO detection, and more than two collided packets in multiple slots which can construct the virtual MIMO model can be decoded by the MIMO detection algorithm. The performance of the proposed scheme is analyzed with the density evolution (DE) approach and the degree distribution is optimized to maximize the system throughput by using a differential evolution. Numerical results certify our analysis and show that the normalized throughput of the proposed PM-IRSA can achieve 1.89 bits/symbol.

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Section: Simulation Resultsmentioning

confidence: 99%

Enhancing Irregular Repetition Slotted ALOHA with Polarization Diversity in LEO Satellite Networks

Su¹,

Ren²,

Zhao³

et al. 2020

KSII TIIS

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“…Then, due to Doppler effect, the CFO would be significantly higher. A hybrid algorithm for joint CFO estimation and user detection is proposed in [20]. Unfortunately, it's user detection performance is very sensitive to channel SNR variation (see [7,Figure 2]).…”

Section: Challenges In Ius Problemmentioning

confidence: 99%

“…The first one is the MS-HMUD algorithm proposed in [20], the second one is the SIC algorithm in [7], and the third one is the Block-SIC method of [11]. In Figure 12a we plot the miss-detection rates of the proposed algorithm, SIC method [7], Block-SIC [11], and MS-HMUD [20] as functions of SNR min . The In Figure 12b we plot the miss-detection of different methods as functions of CFO for different numbers of users.…”

Section: Numerical Case Studiesmentioning

confidence: 99%

A New Perspective on the Initial Uplink Synchronization Problem

Mahata

Hyder

2020

IEEE Access

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We explore the frequency domain properties of the signal model associated with the initial uplink synchronization (IUS) problem, and provide some new insights. We show that the adverse effects of carrier frequency offset (CFO) are confined in a small region in the frequency domain. We present a new code design approach that avoids the above mentioned region to cancel the adverse effects of CFO. In this design the codes of different users occupy mutually disjoint intervals on the frequency axis. In this way we minimize the interference between different codes, and thereby, allow considerably large number of simultaneous IUS users in the system. For the proposed codes, we design a simple energy detector. This detector relies on classical results from statistical detection theory. We also propose a simple timing offset estimation technique, which requires us to locate the maximum in a periodogram. The resulting detectionestimation algorithms are simple, non-iterative, fast and accurate. The utility of the proposed design is illustrated using numerical simulation results.

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“…By doing so, eNB coverts the physical sequence to a preamble ID, which represents the additional information as well as the UE-specific ID. We used the multi-user detection scheme in [35].…”

Section: Proposed Preamble Detectionmentioning

confidence: 99%

Low Latency Random Access for Small Cell Toward Future Cellular Networks

Kim

Kim²,

Kim

et al. 2019

IEEE Access

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In future cellular networks, performance target includes not only increasing data rate, but also reducing latency. The current LTE-Advanced systems require four message exchanges in the random access and uplink transmission procedure, thus inducing high latency. In this paper, we propose a 2-way random access scheme which effectively reduces the latency. The proposed 2-way random access requires only two messages to complete the procedure at the cost of increased number of preambles. We study how to generate such preambles and how to utilize them. According to extensive simulation results, the proposed random access scheme significantly outperforms conventional schemes by reducing latency by up to 43%. We also demonstrate that computational complexity slightly increases in the proposed scheme, while network load is reduced more than a half compared to the conventional schemes. INDEX TERMS 5G, low latency, random access, small cell, uplink transmission.

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A Multiuser Detection Algorithm for Random Access Procedure With the Presence of Carrier Frequency Offsets in LTE Systems

Cited by 17 publications

References 20 publications

Enhancing Irregular Repetition Slotted ALOHA with Polarization Diversity in LEO Satellite Networks

Enhancing Irregular Repetition Slotted ALOHA with Polarization Diversity in LEO Satellite Networks

A New Perspective on the Initial Uplink Synchronization Problem

Low Latency Random Access for Small Cell Toward Future Cellular Networks

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