Performance Analysis for Direction of Arrival Estimating Algorithms

Shrestha, Pradhumna Lal; Hempel, Michael; Mahasukhon, Puttipong; Ma, Tao; Sharif, Hamid

doi:10.1109/vetecs.2012.6240151

Cited by 11 publications

(2 citation statements)

References 13 publications

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“…The power at the output of antenna array will be the function of DOA estimations and is given by MVDR angular spectrum as [30][31] ܲ ெோ (∅) = (1) (ܵ ு ‫ܯ‬ ିଵ ܵ) ⁄…”

Section: ‫ܲ(݊݅ܯ‬mentioning

confidence: 99%

Modified Optimum Beamforming for Smart Antenna in WCDMA Network

Singla

Saxena

2013

2013 International Conference on Machine Intelligence and Research Advancement

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Third-Generation based Wide Band Code DivisionMultiple Access (W-CDMA) networks have been characterized for high data rate services accessible to a large number of users. But multipath and co-channel interference puts a limit on system capacity, throughput and new multimedia information services like wireless internet or video streaming. Smart antenna technique that includes Direction of Arrival (DOA) approach and Adaptive Beamforming algorithm is a promising means to improve the over-all system capacity and to overcome limited spectrum problem by effectively reducing the multipath and co-channel interference. In this paper, DOA estimation is done by Multiple Signal Classification (MUSIC) algorithm and Minimum Variance Distortionless Response (MVDR) algorithm is used for adaptive beamforming that continuously adjusts the weight of antenna arrays for creating a beam to track the desired user automatically, and to place null towards the interference user. Here, we improve on the MVDR method in order to assign the weightings. Instead of using a single linear equality constraint, a variable constraint has been used to obtain the optimum weights that decrease the gain in the undesired direction and desired direction comes out with more gain and without distortion. Obtained results are analyzed for the conventional method and the proposed method by observing beamforming spectrum by first varying number of antenna elements and then by varying the spacing between elements. For both the cases, the performance is better for the proposed method in terms of lower noise floor, more relative power and sharper peaks in the desired user direction than conventional method.

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“…The power at the output of antenna array will be the function of DOA estimations and is given by MVDR angular spectrum as [30][31] ܲ ெோ (∅) = (1) (ܵ ு ‫ܯ‬ ିଵ ܵ) ⁄…”

Section: ‫ܲ(݊݅ܯ‬mentioning

confidence: 99%

Modified Optimum Beamforming for Smart Antenna in WCDMA Network

Singla

Saxena

2013

2013 International Conference on Machine Intelligence and Research Advancement

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“…In an effort to enhance smart antenna performance in reducing Doppler shift degradation, Shrestha et al [78] proposed a scheme based on a complex mobile network such as railroad wireless communication system. The idea was to analyze the selection of a DOA estimation algorithm which provides the maximum efficiency when deployed in the system.…”

Section: Beamforming-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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