Abstract:
The present invention provides a channel estimation method and apparatus based on implicit training sequences for use in wireless communication systems, characterized in that stationary training sequences are superimposed with information sequences for transmission at the transmitting side and channel estimation is performed at the receiving side by using the uncorrelated characteristic between the training sequences and the information sequences, that is, channel estimation is done based on the principle that the estimation result of channel parameter converges to a Wiener solution under the condition that the training sequences and information sequences in the transmission signals are uncorrelated. The method of the invention comprises steps of: obtaining a set of training sequences comprising a plurality of subsets of training sequences, each of the plurality of subsets is generated based on a known initial training sequence and a predetermined channel order; calculating the cross-correlation matrix for the subsets of training sequences and the corresponding inverse matrix; calculating the cross-correlation matrix for the set of training sequences and the received signals; and estimating channel parameters based on the inverse cross-correlation matrix for the subsets of training sequences and the cross-correlation matrix for the set of training sequences and the received signals.
Abstract:
A method and device for channel estimation are disclosed. The method comprises the steps of classifying sub-vectors of a decorrelated sample signal in a channel into two subsets, determining centers of the two subsets, and estimating a channel vector of the channel according to the determined centers of the subsets. The method can be implemented by the device. The method and device can only utilize a first-order statistic information of the received signal to perform the accumulate operation with an amount of calculation much less than that of other effective blind estimation algorithms, and are particularly suitable for implementation by logic circuits. Furthermore, satisfactory estimation accuracy can be obtained by only using a very short data frame.
Abstract:
Signal transmitting/receiving electronic devices or terminals in the present disclosure are configured to conduct per-beam signal synchronization in massive MIMO communication with a signal receiving/transmitting device or base station. During the massive MIMO communication, the devices or terminals are configured to transmit/receive signals via a set of beams to or from the signal receiving/transmitting device or base station. For beam domain signal of each individual beam of the plurality beams, the devices or terminals are configured to determine target time adjustments based on time shifts of the beam domain signals induced by multipath effect and target frequency adjustments based on frequency offsets of the beam domain signals induced by the Doppler effect; adjust time independent variables of the beam domain signals by the time adjustments; and adjust frequency independent variables of the beam domain signals by the frequency adjustments. Further, per-beam synchronized BDMA massive MIMO transmission method is disclosed, which provides a solution to efficient and reliable wireless communications with high mobility and/or high carrier frequency.
Abstract:
The present invention discloses a microstrip antenna, comprising: a ground plate; a radiant plate, wherein the radiant plate being an isosceles triangle having a "U"-shape cut thereon with the opening facing towards the bottom side of the triangle; at least one connector connected to the radiant plate via a feeding point disposed on the radiant plate, through which the radiant plate can be excited from beneath the ground plate to form electromagnetic radiation; a first set of apertures disposed on the ground plate for enhancing the dominant wave; and a second set of apertures further disposed on the ground plate for weakening other secondary waves instead of dominant wave. The microstrip antenna of the present invention has an improved bandwidth, reduced cross coupling between the antenna units, and improved antenna performance.
Abstract:
A signal transmitting/receiving apparatus and method for wireless communication system is disclosed. The transmitting apparatus in the present invention comprises a multi-path output selector for dividing the input information sequence into multiple paths, so as to obtain multiple shunt signals; and multiple transmitting units corresponding to the multiple shunt signals respectively. Each of the transmitting units includes a serial-to-parallel converter for serial-to-parallel converting of the shunt signals so as to obtain multiple block signals of a predetermined length; and a space-time block coder for space- time block coding the block signals so as to obtain multiple sets of coded block signals having orthogonality in the frequency domain. The corresponding receiving apparatus is also disclosed in the present invention. Compared with the prior art, the present invention is provided with higher coding rate and is more applicable to fast changing time-varying channels, and has less computation complexity.
Abstract:
The present invention discloses a microstrip antenna, comprising: a ground plate; a radiant plate; at least one connector connected to the radiant plate via a feeding point disposed on the radiant plate, through which the radiant plate can be excited from beneath the ground plate to form electromagnetic radiation; a first set of apertures disposed on said ground plate for enhancing the dominant wave; and a second set of apertures further disposed on said ground plate for weakening other secondary waves instead of dominant wave. The microstrip antenna of the present invention has an improved bandwidth, reduced cross coupling between the antenna units, and improved antenna performance.