Interference Analysis in Time and Frequency Asynchronous Network MIMO OFDM Systems

Kotzsch, Vincent; Fettweis, Gerhard

doi:10.1109/wcnc.2010.5506397

Cited by 36 publications

(15 citation statements)

References 9 publications

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“…Synchronization: Cooperating base stations have to be synchronized in frequency such that intercarrier interference is avoided, and in time in order to avoid both intersymbol and intercarrier interference [10]. The maximum distance of cooperating base stations is limited since different propagation delays of different terminals may conflict with the guard interval.…”

Section: Challengesmentioning

confidence: 99%

Coordinated multipoint: Concepts, performance, and field trial results

et al. 2011

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Coordinated multipoint or cooperative MIMO is one of the promising concepts to improve cell edge user data rate and spectral efficiency beyond what is possible with MIMO-OFDM in the first versions of LTE or WiMAX. Interference can be exploited or mitigated by cooperation between sectors or different sites. Significant gains can be shown for both the uplink and downlink. A range of technical challenges were identified and partially addressed, such as backhaul traffic, synchronization and feedback design. This article also shows the principal feasibility of COMP in two field testbeds with multiple sites and different backhaul solutions between the sites. These activities have been carried out by a powerful consortium consisting of universities, chip manufacturers, equipment vendors, and network operators.

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Section: Challengesmentioning

confidence: 99%

Coordinated multipoint: Concepts, performance, and field trial results

et al. 2011

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“…In a network layer-based scheme Kotzsch and Fettweis [59] proposed a method for Doppler shift compensation based on asynchronous spatially multiplexed transmission. The idea was to factorize the model and identify the most effective factor for Doppler shift compensation in relay networks.…”

Section: Time-partitioning-based Schemesmentioning

confidence: 99%

Doppler Shift Compensation Schemes in VANETs

Nyongesa¹,

Djouani²,

Olwal³

et al. 2015

Mobile Information Systems

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Over the last decade vehicle-to-vehicle (V2V) communication has received a lot of attention as it is a crucial issue in intravehicle communication as well as in Intelligent Transportation System (ITS). In ITS the focus is placed on integration of communication between mobile and fixed infrastructure to execute road safety as well as nonsafety information dissemination. The safety application such as emergence alerts lays emphasis on low-latency packet delivery rate (PDR), whereas multimedia and infotainment call for high data rates at low bit error rate (BER). The nonsafety information includes multimedia streaming for traffic information and infotainment applications such as playing audio content, utilizing navigation for driving, and accessing Internet. A lot of vehicular ad hoc network (VANET) research has focused on specific areas including channel multiplexing, antenna diversity, and Doppler shift compensation schemes in an attempt to optimize BER performance. Despite this effort few surveys have been conducted to highlight the state-of-the-art collection on Doppler shift compensation schemes. Driven by this cause we survey some of the recent research activities in Doppler shift compensation schemes and highlight challenges and solutions as a stock-taking exercise. Moreover, we present open issues to be further investigated in order to address the challenges of Doppler shift in VANETs.

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“…In most of the work in the literature, perfect synchronization in time and frequency is a common presumption. In fact, the asynchrony is mostly considered as an impairment [1], [2] where different synchronization methods are applied to eliminate it [3]. However, by using appropriate transceiver design, asynchrony can indeed be beneficial.…”

Section: Introductionmentioning

confidence: 99%

Improving NOMA Multi-Carrier Systems With Intentional Frequency Offsets

Ganji

Jafarkhani

2019

IEEE Wireless Commun. Lett.

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In this letter, we investigate the possible benefits of asynchrony in the frequency domain for the non-orthogonal multiple access (NOMA) schemes. Despite the common perspective that asynchrony in transmission or reception of multistream signals is harmful, we demonstrate the advantages of adding intentional frequency offset to the conventional power domain-NOMA (P-NOMA). We introduce two methods which add artificial frequency offsets between different sets of subcarriers destined for different users. The first one uses the same successive interference cancellation (SIC) method as the conventional P-NOMA except that it enjoys reduced inter-user interference (IUI) between interfering sub-carriers. The second scheme adopts a precoding at the base station and a linear preprocessing scheme at the receiving user. It decomposes the broadcast channel into parallel channels circumventing the need for SIC. As a result, it fully exploits the advantages provided by the frequency asynchrony and enables the interference-free transmission to the users. The numerical results show that both methods can outperform the conventional P-NOMA.

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Interference Analysis in Time and Frequency Asynchronous Network MIMO OFDM Systems

Cited by 36 publications

References 9 publications

Coordinated multipoint: Concepts, performance, and field trial results

Coordinated multipoint: Concepts, performance, and field trial results

Doppler Shift Compensation Schemes in VANETs

Improving NOMA Multi-Carrier Systems With Intentional Frequency Offsets

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