The invention discloses a vector array multiple input multiple output-based (MIMO) high-speed underwater sound communication method. The method comprises the following steps of: 1) simultaneously transmitting i
Using a QSHB algorithm produces the analog pre- coding and combining weights, which are just steering vectors corresponding to the dominant modes of the channel matrix H of a MIMO scattering channel: • Precoding matrices FRF and FBB • Combining matrices WRF and WBB Having the resolved ...
MIMO systemsANTENNA arraysAs a very promising choice for wireless communication, multiple-input multiple-output (MIMO) technology has the potential to alleviate traffic capacity limitations in high-speed broadband wireless network access. The MIMO system uses multiple antennas at the sen...
Using the transmit signal chain as our first example, each element within a subarray can have a phase shift applied directly in the RF domain, while digital beamforming techniques based on complex weighting vectors can be applied on the signals that feed each subarray. Digital beamforming allows ...
Therefore, we propose the hybrid processing for sparse MIMO based ILAC, i.e., physical array based communication while virtual array based localization. To this end, we characterize the beam pattern of sparse arrays by three metrics, demonstrating that despite of the introduction of grating lobes,...
Beampattern synthesis is of great importance in the field of multi-antenna research [1]. After determining a set of appropriate weight vectors, the controllable patterns are applied to radar, sonar, and wireless communications to improve system performance [2], [3], [4], [5], [6]. For ...
The PB method, RQ method and SNS method also use the modified L-shaped array, which only has translation differences compared to original L-shaped array (i.e. two scalar differences in the steering vectors in Equation (3a), (3b), and the scalars would not cause interference as the PB ...
Section 5 provides simulation results, and the conclusions are drawn in Section 6. Notations. Vectors and matrices are represented by utilizing bold low-case and bold-case characters, respectively. ⊗ is Kronecker product, and ⊙ denotes Khatri-Rao product. (⋅)T, (⋅)H, (⋅)−1, ...
A new oblique projector is designed to isolate the coherent signals from the uncorrelated ones so that a virtual MIMO array observation can be rebuilt. In the DOD estimation, via Lagrange multiplier optimization, the auto-paired transmit array steering vectors of uncorrelated and coherent signals can...
A separate antenna controller 24 may electrically connect with the array 10 to calculate beam steering vectors and switch between the receive mode and the transmit mode. FIG. 6 shows a process of forming the phased array 10 and AESA system 1 in accordance with illustrative embodiments of the ...