Method of maximizing MIMO system performance by joint optimization of diversity and spatial multiplexing
AssigneeSamsung Electronics Co., Ltd.
InventorsJun Shen, Chiu Y. Ngo, Huaning Niu
Life of this patent
Estimating the term…
Abstract
A method of transmission in a wireless communication system having a transmitter and a receiver. In the transmitter: signals are encoded using a space-domain precoder for spatial multiplexing, time-domain variable delay is introduced at each signal communication path for time diversity, and the signal are transmitted to the receiver. In the receiver the signal transmissions from the transmitter are decoded using a space-domain decoder, wherein time diversity and spatial multiplexing are combined, to increase communication robustness and spectral efficiency.
Claims16
A wireless communication system comprising:
- a transmitter including:
- a space-domain precoder configured for processing in the space-domain, and
- a variable delay device configured for introducing adaptive time-domain variable time delay at each signal communication path for time diversity in the time-domain, where the variable delay device introduces delay in each path to modify the signal characteristics such that the signal along different paths are received with higher diversity order at the receiver;
- a receiver including a space-domain decoder for processing in the space-domain, wherein the receiver receiving signal transmissions from the transmitter, the receiver sends channel state information (CSI) back to the transmitter including eigenmode power distribution and precoder matrix, and the variable delay device adaptively adjusts the variable delays based on the CSI feedback from the receiver to provide uncorrelated signal transmissions at the receiver;
- such that the transmitter and the receiver combine time diversity and spatial multiplexing, to increase communication robustness and spectral efficiency, wherein the received signal transmissions are based on the output of the decoder, a channel matrix, precoder output, set of coded symbols and a noise vector, where the system is based on the model of Y=GHFX+GN, where Y is the received signal transmissions, G is the output of the decoder, H is the channel matrix, F is the precoder output, X is the set of coded symbols and N is the noise vector.
A method of transmission in a wireless communication system including a transmitter and a receiver, comprising:
- in the transmitter:
- precoding signals using a space-domain precoder for spatial multiplexing in the space-domain;
- adaptively adjusting a delay vector in a variable delay block using spatial multiplexing;
- introducing time-domain adaptive variable delay at each signal communication path for time diversity in the time-domain such that signals along different paths are received with higher diversity order at the receiver;
- and
- transmitting the signals to the receiver;
- and
- in the receiver:
- receiving signal transmissions from the transmitter;
- sending channel state information (CSI) back to the transmitter including eigenmode power distribution and precoder matrix;
- and
- decoding the signal transmissions from the transmitter using a space-domain decoder in the space-domain;
- wherein matrices in the precoder and the decoder are adaptively adjusted, wherein spectral efficiency and link robustness are maximized, the introduced variable delay adaptively adjusts the variable delays based on the CSI feedback from the receiver to provide uncorrelated signal transmissions at the receiver, and
- wherein time diversity and spatial multiplexing are combined, to increase communication robustness and spectral efficiency.
Dependencies are inferred from the claim text.