Joint sector identity and integer part of carrier frequency offset detection by phase‐difference in Long Term Evolution cell search process

Su, Szu Lin; Lin, Yung Chuan; Fan, Yun Jhen

doi:10.1049/iet-com.2012.0307

Cited by 17 publications

(26 citation statements)

References 18 publications

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“…A raised-cosine functions with roll-off 0.22 and time-duration of 6 sampling periods is employed for the pulse shaping, which corresponds to an overall CIR of order L =int{f s τ max + 6} = 160. Assuming a maximum normalized timing error θ max = 40 [16], the length of the equivalent CIR vector h eq is found to be L + θ max = 200. However, since parameter P (and the system complexity) is expected to increase with the CIR duration, in the design of the AMMSE we use L eq = 120 , which amounts to reducing the size of matrix F from 63 × 200 to 63 × 120.…”

Section: A Simulation Modelmentioning

confidence: 99%

A Robust Maximum Likelihood Scheme for PSS Detection and Integer Frequency Offset Recovery in LTE Systems

Morelli

Moretti

2016

IEEE Trans. Wireless Commun.

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Abstract-Before establishing a communication link in a cellular network, the user terminal must activate a synchronization procedure called initial cell search in order to acquire specific information about the serving base station. To accomplish this task, the primary synchronization signal (PSS) and secondary synchronization signal (SSS) are periodically transmitted in the downlink of a Long Term Evolution (LTE) network.Since SSS detection can be performed only after successful identification of the primary signal, in this work we present a robust scheme for joint PSS detection, sector index identification and integer frequency offset (IFO) recovery in an LTE system. The proposed algorithm relies on the maximum likelihood (ML) estimation criterion and exploits a suitable reduced-rank representation of the channel frequency response to take multipath distortions into account. We show that some PSS detection methods that were originally introduced through heuristic reasoning can be derived from our ML framework by selecting an appropriate model for the channel gains over the PSS subcarriers.Numerical simulations indicate that the proposed scheme can be effectively applied in the presence of severe multipath propagation, where existing alternatives provide unsatisfactory performance.Index Terms-LTE, cell search, sector index identification, integer frequency offset recovery.

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Section: A Simulation Modelmentioning

confidence: 99%

A Robust Maximum Likelihood Scheme for PSS Detection and Integer Frequency Offset Recovery in LTE Systems

Morelli

Moretti

2016

IEEE Trans. Wireless Commun.

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“…The first group of papers does not provide an estimation error lower bound [78,82,86,92,94,99,113,114,115,117,128,137,157,188]. In addition to carrier synchronization, the CFO estimation algorithm proposed by [78] is valid even if timing offset and channel length is unknown, the algorithm proposed by [82] estimates integer frequency offset, the algorithm proposed by [86] estimates sampling frequency offset in addition to CFO, [92] estimates IFO for OFDM-based digital radio mondiale plus system, [94] considers IQ imbalance and directconversion receivers, [99] considers CFO tracking in digital video broadcasting (DVB-T) system, [113] proposes ML based estimation, [114] and [117] propose IFO estimation with cell sector identity detection in long term evolution systems, [115] considers IQ imbalance and hardware implementation, [128] also considers SFO estimation, [137] proposes ML based estimation and considers the design of pilot pattern, the estimation algorithm in [157] is robust to the presence of Doppler shift and [188] considers IQ imbalance and its estimation. The second group of papers provides an error lower bound on CFO estimation [83,84,91,101,102,104,132,136,138,160,163,…”

Section: Siso Systemsmentioning

confidence: 99%

Timing and carrier synchronization in wireless communication systems: a survey and classification of research in the last 5 years

Nasir

Durrani

Mehrpouyan

et al. 2016

J Wireless Com Network

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Timing and carrier synchronization is a fundamental requirement for any wireless communication system to work properly. Timing synchronization is the process by which a receiver node determines the correct instants of time at which to sample the incoming signal. Carrier synchronization is the process by which a receiver adapts the frequency and phase of its local carrier oscillator with those of the received signal. In this paper, we survey the literature over the last 5 years (2010)(2011)(2012)(2013)(2014) and present a comprehensive literature review and classification of the recent research progress in achieving timing and carrier synchronization in single-input single-output (SISO), multiple-input multiple-output (MIMO), cooperative relaying, and multiuser/multicell interference networks. Considering both single-carrier and multi-carrier communication systems, we survey and categorize the timing and carrier synchronization techniques proposed for the different communication systems focusing on the system model assumptions for synchronization, the synchronization challenges, and the state-of-the-art synchronization solutions and their limitations. Finally, we envision some future research directions.

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“…There exist some studies focusing on the PSS detection [13][14][15][16][17][18]. Some of these methods perform in the time domain [13,14], while the others use frequency-domain samples obtained from a discrete Fourier transform (DFT) unit [15][16][17][18]. In [14], the PSS detection method was proposed to be performed by finding the maximum of the cross-correlation in the time domain, wherein the integer carrier frequency offset (IFO) degrades the accuracy of detecting the PSS.…”

Section: Introductionmentioning

confidence: 99%

“…In [14], the PSS detection method was proposed to be performed by finding the maximum of the cross-correlation in the time domain, wherein the integer carrier frequency offset (IFO) degrades the accuracy of detecting the PSS. To overcome this limitation, several differential correlation based PSS detection schemes have been presented using the frequency-domain PSS [15], wherein the IFO is estimated in parallel with the search process of PSS. As for the IFO, it can be detected in a joint or sequential way.…”

Section: Introductionmentioning

confidence: 99%

“…As for the IFO, it can be detected in a joint or sequential way. The works in [15,16] estimate the IFO jointly during the PSS-matching process, which is accomplished performing the frequency-domain shift of the received PSS. Although the maximum likelihood (ML) estimator can achieve optimal performance in detecting the IFO [17], the complexity in realizing the ML solution is prohibitively high.…”

Section: Introductionmentioning

confidence: 99%

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A Computationally Efficient Joint Cell Search and Frequency Synchronization Scheme for LTE Machine-Type Communications

2019

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The key features for future machine-type communication cellular systems facilitate low-power, low-cost, narrow-band, and wide-area systems. One of the challenging tasks to realize these requirements in machine-type communication cellular networks is a low-cost initial synchronization. To address this issue, this paper presents a reduced-complexity joint estimation of integer carrier frequency offset and cell identity for machine-type communication in the long-term evolution system. Using the conjugate property of a primary synchronization signal, joint search space of a number of hypotheses is reduced by two-thirds, facilitating low-complexity detection. The performance is assessed in terms of theoretical probability of detection failure. Simulation results confirm that the proposed estimation scheme achieves approximately the same performance as the conventional scheme with notably low complexity.

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Joint sector identity and integer part of carrier frequency offset detection by phase‐difference in Long Term Evolution cell search process

Cited by 17 publications

References 18 publications

A Robust Maximum Likelihood Scheme for PSS Detection and Integer Frequency Offset Recovery in LTE Systems

A Robust Maximum Likelihood Scheme for PSS Detection and Integer Frequency Offset Recovery in LTE Systems

Timing and carrier synchronization in wireless communication systems: a survey and classification of research in the last 5 years

A Computationally Efficient Joint Cell Search and Frequency Synchronization Scheme for LTE Machine-Type Communications

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