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We propose a Taylor expansion multiple signal classification (TE MUSIC) method for joint direction of departure (DOD) and direction of arrival (DOA) estimation in a bistatic multiple-input multiple-output (MIMO) array. First, using a Taylor expansion of the steering vector, a two-dimensional (2D) search in the conventional MUSIC method for MIMO arrays is reduced to a two-step one-dimensional (ID)...
A novel maximum likelihood direction of arrival estimator based on modified ant colony optimization is proposed to lighten the exponentially increasing computation burden introduced by multidimensional grid search. By integrating chaos initialization and local search, modified ant colony optimization can overcome the drawbacks of ant colony optimization, such as low convergence speed and being easily...
Relay selection is a challenging issue in cooperative communication networks. In particular, in a multi-user multi- concurrent-transmission network, effects of the resource sharing of a relay by its served users on the relay selection strategy need to be taken into account. There is little research on this investigation in literature. In this paper, we propose a novel efficient and fair relay selection...
A new resource allocation scheme for joint routing and subcarrier allocation is proposed in the orthogonal frequency division multiple access (OFDMA)-based relay system. The objective of the scheme is to maximize the system throughput while guaranteeing the user QoS (quality of service) requirements. The optimization problem is tackled in a graph-theoretic perspective. The simulation results reveal...
In this paper, the wideband beamforming based on microphone arrays(MA) is investigated. This method combined the technologies of frequency focusing and sub-band partitioning. The frequency focusing algorithm is to focus the wideband signals to the narrowband signals at the reference frequency. But this algorithm only applies for the signals with fractional bandwidth less than 1.25. The improved focusing...
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