Improved LTE like initial uplink synchronization via reduced problem dimension

Hyder, Mashud; Mahata, Kaushik

doi:10.1016/j.comcom.2019.05.015

Cited by 2 publications

(5 citation statements)

References 21 publications

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“…SIC algorithms are fast, but their detection performance degrades quickly if the number of simultaneous IUS users is increased. The recent work [11] attempts to resolve this issue to some extent by reducing the underlying problem dimension.…”

Section: B Existing Methodsmentioning

confidence: 99%

“…But it is wellknown that it is difficult to obtain accurate timing offset estimates for these sub-carrier partitioning schemes. The recent contribution in [11] have been able to produce somewhat improved timing offset estimates, and at the same time is able to improve the detection performance in presence of somewhat higher MAI level.…”

Section: Challenges In Ius Problemmentioning

confidence: 98%

“…Unfortunately, it's user detection performance is very sensitive to channel SNR variation (see [7,Figure 2]). The algorithm in [11] works well when the CFO is below 50% of the PRACH subcarrier spacing. But its performance deteriorates rapidly if the CFO increases more than that.…”

Section: Challenges In Ius Problemmentioning

confidence: 99%

“…Next we propose an algorithm to estimate d . This algorithm is motivated by our previous experience in [7], [11], where we found that a correlator type propagation delay estimator is often excellent for practical purposes. In fact in [7], [11] we found that the correlator type methods perform better than rather sophisticated and complex estimation methods.…”

Section: Estimation Of User Attributesmentioning

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%

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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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Section: B Existing Methodsmentioning

confidence: 99%

Section: Challenges In Ius Problemmentioning

confidence: 98%