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Machine type communication (MTC) is a typical scenario in 5G communication systems, and massive machine type communication (MMTC) is a main type of MTC. One prominent characteristic of MMTC is massive connections and sporadic transmission with short packets. To embrace the new challenge in 5G emerging scenarios, flexible filterbased waveforms have been widely studied recently. In this paper, we evaluate...
This paper focuses on performance evaluation of waveforms in the fifth generation, i.e. universal-filtered multi-carrier technique (UFMC), resource block filtered orthogonal frequency-division multiplexing (RB-F-OFDM), filtered-OFDM (F-OFDM), and filter-bank multi-carrier (FBMC) in high speed scenarios. The block error rates (BLERs) of the channel model of tapped-delay-line-D (TDL-D) defined in 3GPP...
In this paper, the propagation for 3GPP high speed train (HST) scenarios is studied both at 30 GHz and 3.5 GHz. Urban, cutting and viaduct scenarios are modeled and simulated by using 3GPP deployment configurations. The optimum direction of beam is suggested in order to achieve the best coverage. Propagation at 30 GHz and 3.5 GHz are compared in terms of received power and Doppler shift. The wideband...
Nowadays, rail traffic is expected to evolve into a new era of “smart rail mobility”, which requires a seamless high-data rate wireless connectivity with up to dozens of GHz bandwidth. Such a huge bandwidth requirement motivates the exploration of the underutilized millimeter (mm) wave and Terahertz (THz) bands. In this paper, six scenario modules for mm wave and THz train-to-infrastructure channels...
The next-generation cellular network is to provide a large variety of services for different kinds of terminals, from traditional voice and data services over mobile phones to small packet transmission over massive machine-type terminals. Although orthogonal-subcarrier-based waveforms are widely used nowadays in many practical systems, they can hardly meet the requirements in the coming 5G networks...
One of 5G communication typical scenarios is machine-to-machine communication with large number of devices, which proposes new requirements for uplink transmission. Filter bank multi-carrier with offset quadrature amplitude modulation (FBMC/OQAM) is one of the popular nonorthogonal waveform candidates for 5G transmission. In this paper, FBMC/OQAM and cyclic prefix OFDM with single antenna settings...
Non-orthogonal multiple access (NOMA) is a promising candidate for future 5G multiple access. Particularly NOMA uses power domain for multiple access and successive interference canceler (SIC) algorithm for multiuser detection (MUD). Different from the current downlink transmission scheme for NOMA, a novel joint coding scheme is proposed in this paper and corresponding improved SIC algorithms: zigzag...
Internet of things (IoT) and machine-type-communication (MTC) will play an important role in 5G communication systems. Combining the simplicity of Orthogonal Frequency Division Multiplexing (OFDM) with the advantages of Filtered Bank Based Multi-Carrier (FBMC), Universal Filtered Multi-Carrier (UFMC) is robust to frequency offset and timing offset, and supports segmented spectrum communication by...
The contention-based (CB) transmission is a promising solution for small data packets transmission in 5G uplink. In this paper, a Non-Orthogonal Coded Access (NOCA) scheme, called ZC-NOCA, is proposed for CB transmission in 5G uplink. For ZC-NOCA, the codes generated by Zadoff-Chu (ZC) sequences is used to spread the data bit over the Orthogonal Frequency Division Multiple (OFDM) symbols. Different...
The fifth generation (5G) communication has recently attracted much interest. In this paper we present radio channel measurements on campus at 3.5 GHz, which is the candidate frequency band for the 5G communications. The measurement setup is based on software radio units with a bandwidth of 30 MHz, and the measurements were conducted on campus of Beijing Jiaotong University, China. We discuss the...
The channel nonstationarity caused by the train mobility is measured for the composite high-speed railway (HSR) scenario. The time-varying quasi-stationarity region analysis is based on spectral divergence (SD) metric carried on different frequencies. An obvious transition region is found in composite HSR. Moreover, based on the comparison of different frequencies, we found the apparent discrepancy...
The rapidly time-varying channel in high-speed railway poses tough design challenges, which necessitates the research of accurate channel models. Existing researches focus on the isolated high-speed railway scenarios, and mainly deal with path loss, shadowing fading, Ricean K-factor and delay spread. However, few studies have been done in Doppler domain. In this paper, a deterministic channel model...
Massive MIMO has been chosen as one of the candidate technologies of the fifth-generation mobile communication system (5G), and channel modeling of massive MIMO is of great importance. The most direct and effective approach to investigate the propagation characteristics of massive MIMO channels is channel measurements. However, there are only few measurements of massive MIMO channels, and there still...
This paper focuses on the influence of mobility in rapidly time-varying channels. Local and global behaviors are researched based on the path-based channel model and ray-tracing channel model, respectively. The scenario employed in the global behavior analysis is a realistic composite high-speed railway (HSR) scenario, which is reconstructed by SketchUp. The analysis results include frequency modulation...
In this paper we consider the deployment of 3D-MIMO in traditional LTE bands (∼1.8–3.5GHz) though 3D-MIMO is also considered an integral element of 5G systems. We show how the architecture of the 3D-MIMO antenna system (i.e., the connectivity between the transceivers and the physical antenna elements) can significantly impact system performance. At the cost of additional complexity in the array architecture...
Massive MIMO has emerged as one technology enabler for the next generation mobile communications 5G. The gains promised by massive MIMO are augured to overcome the capacity crunch in today's mobile networks and to pave the way for the ambitious targets of 5G. The challenge to realize massive MIMO for 5G is a successful and cost-efficient integration in the overall network concept. This work highlights...
In LTE/LTE-A system, Link Adaptation (LA) is a crucial procedure. One key factor is to have precious interference estimation considered in the LA, since the accuracy of interference estimation has a significant impact on the Channel Quality Indicator (CQI). In this paper we pay our attention to the CQI mismatch problem in Link Adaptation procedure, which is mainly caused by rapid fluctuation of inter-cell...
Keep-alive messages generated from always-on type applications on smartphones can lead to frequent transitions between Long Term Evolution (LTE) Radio Resource Control (RRC) states, pushing significant increase of signaling traffic. In this paper, we investigate the performance of signaling overhead caused by keep-alive messages based on LTE RRC state transition procedure for various RRC inactivity...
With the rise of the user base of smartphones, the cellular networks are facing increasing uplink signalling traffic pressure caused mainly by the soaring background traffic of smartphone applications. Therefore, this paper studies the LTE radio resource control (RRC) state transition, which is highly related to the amount of signalling traffic, caused by the background traffic. Firstly, we propose...
Many papers have shown that low density parity-check (LDPC) codes exhibit excellent performance in the additive white noise (AWGN) channel and flat fading channels, but their performance on frequency-selective fading channels slightly degrades. In this paper, we present the construction of a new algebraic geometric LDPC code and its decoding algorithm, evaluate the performance of AG density parity-check...
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