The research on random access signal detection algorithm in LTE systems

Liang, Bin; He, Zhiqiang; Niu, Kai; Tian, Bo; Sun, Shaojun

doi:10.1109/mape.2013.6689965

Cited by 8 publications

(7 citation statements)

References 1 publication

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“…The conventional correlation based multiuser detection algorithm is discussed in [7]- [10], in which the correlation processing is actually implemented to derive the transformdomain channel taps because 1) ZC codes should be decoded into the transform-domain by using an M -point IDFT, 2) the cyclic-shift of ZC codes facilitates the channel estimation; and 3) an M -point IDFT could significantly reduce the computational complexity instead of an N -point IDFT. The correlation based algorithm is given in Appendix, in which the vector of transform-domain channel taps of a code C v k is defined as…”

Section: A Problem In Conventional Prachmentioning

confidence: 99%

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A Centralized Preamble Detection-Based Random Access Scheme for LTE CoMP Transmission

Wang

Ren

2016

IEEE Trans. Veh. Technol.

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For the coordinated multipoint (CoMP) transmission in LTE systems, its performance is greatly impacted by the estimation of timing offsets (TOs) between cell-edge user equipments and transmit points, which is supposed to be dealt with by using the random access (RA) procedure. Available RA schemes for the CoMP transmission offer poor RA performance in terms of multiuser detection, TO estimation, power estimation, and access delays. To improve the RA performance and fully exploit the CoMP structure, in this work, we propose a novel centralized parallel RA scheme, which performs in threefold. Firstly, a novel RA sub-channel allocation scheme is proposed to suppress mutual interference between coordinated users and non-coordinated users. Secondly, an iterative parallel interference cancellation based multiuser detection and estimation algorithm is proposed on the basis of the space alternating generalized expectation-maximization algorithm. Finally, the coordinated diversity of the system structure could be exploited to implement centralized multiuser detection. Analyses and simulation results show that the proposed RA scheme is able to provide satisfied RA performance compared to existing ones.Index Terms-long term evolution, coordinated multipoint, centralized parallel random access, frequency division multiplexed sub-channels, iterative parallel interference cancellation, coordinated diversity.

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Section: A Problem In Conventional Prachmentioning

confidence: 99%

“…And the conventional correlation based multiuser detection algorithm is utilized to complete the RA procedure [7]- [10]. While for the CoMP transmission, each UE has to complete several RA procedures with all distributed TPs for the CU to obtain the knowledge about TOs and power.…”

Section: Introductionmentioning

confidence: 99%

A Centralized Preamble Detection-Based Random Access Scheme for LTE CoMP Transmission

Wang

Ren

2016

IEEE Trans. Veh. Technol.

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“…In available literature [8]- [11], an implicit assumption has been adopted that frequency uncertainties between transceivers are small enough to be neglected, and that the BS is only required to detect possible preambles and estimate corresponding timing offsets and power levels. By treating other preambles as interference, a single user detection (SUD) algorithm is utilized in the TrD by exploiting a bank of match filters, which correlate the received RA signal with local preambles [8], [9].…”

Section: Introductionmentioning

confidence: 99%

“…By treating other preambles as interference, a single user detection (SUD) algorithm is utilized in the TrD by exploiting a bank of match filters, which correlate the received RA signal with local preambles [8], [9]. If a peak correlation value exceeds a pre-defined threshold, the preamble is deemed as active.…”

Section: Introductionmentioning

confidence: 99%

“…However, in literature [8]- [19], there exist three problems that restrict the development of the LTE RA procedure. Firstly, analyses are only derived for simplicity on the basis of the code division multiple access (CDMA) structure, which is inconsistent with the SC-FDMA structure in LTE uplink, leading to a wide gap between analyses and practical implementations.…”

Section: Introductionmentioning

confidence: 99%

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

Wang

Ren

2015

IEEE Trans. Commun.

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In the LTE system, uplink synchronization can be established through the random access channel, by which timing and frequency offsets between transceivers can be estimated and adjusted. As the single carrier frequency division multiple access (SC-FDMA) structure is utilized in LTE uplink, preambles for the random access channel should be generated and detected in the transform-domain at user equipments and the base station, respectively. However, in available literature, an explicit transformdomain signal model with respect to timing and frequency offsets has not been provided, and the impact of frequency offsets on the transform-domain signal is not analyzed either. Therefore, suffering from unknown interference among multiple user equipments, existing multiuser detection algorithms provide unsatisfied multiuser detection and estimation performance. In this paper, an explicit transform-domain signal model is first derived with respect to both timing and frequency offsets. The characteristic of transform-domain frequency offsets is then analyzed, which indicates that transform-domain frequency offsets behave totally different with time-domain frequency offsets. After that, a multisteps hybrid multiuser detection algorithm is proposed to improve the multiuser detection and estimation performance, and the Cramër-Rao bound to the accuracy of parameters estimation for the random access procedure is finally obtained. Simulation results show that the proposed algorithm is able to significantly improve the multiuser detection and estimation performance compared to existing ones.Index Terms-long term evolution, random access procedure, multiuser detection and estimation, carrier frequency offset. 0090-6778 (c)

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Orthogonal Constant-Amplitude Sequence Families for System Parameter Identification in Spectrally Compact OFDM

Lu,

Chung,

Chen

et al. 2024

Wireless Pers Commun

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The research on random access signal detection algorithm in LTE systems

Cited by 8 publications

References 1 publication

A Centralized Preamble Detection-Based Random Access Scheme for LTE CoMP Transmission

A Centralized Preamble Detection-Based Random Access Scheme for LTE CoMP Transmission

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

Orthogonal Constant-Amplitude Sequence Families for System Parameter Identification in Spectrally Compact OFDM

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