MIMO beamforming-based single carrier frequency division multiple access system

A base station for multiple-input multiple-output (MIMO) communication in a single carrier frequency division multiple access (SC-FDMA) system, the base station comprising:

• a plurality of receive antennas configured to receive transmitted time domain transmit data and generate multiple streams of received data;
• a set of FFT units configured to perform FFT on the received data to generate frequency domain received data;
• a plurality of subcarrier demapping units configured to extract data mapped on the assigned subcarriers;
• at least one channel estimator configured to perform a channel estimation for MIMO channels between a transmitter and a receiver at the base station to generate a channel matrix (H);
• a channel matrix decomposition unit configured to decompose the channel matrix into a diagonal matrix (D), a unitary matrix (U), and a steering matrix (V), such that H=UDVH, wherein a superscript H denotes a Hermitian transpose;
• a channel diagonalization and beamforming unit configured to perform receive beamforming on the data mapped on the assigned subcarriers by applying a Hermitian transpose of the the unitary matrix (U) and a matrix comprised of a product of the steering matrix (V) and an inverse of the diagonal matrix (D) to the extracted frequency domain received data;
• and
• a second set of IFFT units configured to perform IFFT on the beamformed data to generate time domain received data.

A method for multiple-input multiple-output (MIMO) communication in a single carrier frequency division multiple access (SC-FDMA) system, the method comprising:

• performing Fast Fourier Transform (FFT) on data for transmission to generate frequency domain data;
• scaling the frequency domain data with an inverse of a diagonal matrix (D);
• applying a steering matrix (V) to the scaled frequency domain data to generate beamformed frequency domain data, wherein the steering matrix (V) comprises eigenvectors of a matrix formed by a product of a Hermitian transpose of a channel matrix (H) and the channel matrix (H), and the diagonal matrix (D) comprises a square root of the eigenvalues of a product of the channel matrix (H) and the Hermitian transpose of the channel matrix (H);
• mapping the beamformed frequency domain transmit data on subcarriers assigned for transmission;
• performing Inverse Fast Fourier Transform (IFFT) on transmit data mapped to the assigned subcarriers to generate time domain transmit data;
• and
• transmitting the time domain transmit data.