Patent ID: 7486655
Filing Date: 2009-02-03
Classification: H04B,H04L

Abstract:
1. An antenna-array-based multiple-input multiple-output orthogonal-frequency-division-multiplexing (MIMO-OFDM) system, comprising: M M a channel estimator & feedback parameter generator, coupled to the frequency band demodulators and used for estimating an obtained channel state information (CSI) of N different frequency bands according to the outputs from the frequency band demodulators and producing a feedback parameter according to the CSI; N detectors, coupled to the frequency band demodulators and the channel estimator & feedback parameter generator and used for conducting decoding on the outputs from the frequency band demodulators according to the CSI and obtaining N receiving data vectors, wherein a single detector receives the tones with a same frequency band output from all the frequency band demodulators; a vector-coding matrix generator, used for producing N spatial vector-coding matrixes W(n) according to the feedback parameter, wherein when H(n) is a MIMO channel matrix of the n-th frequency band, a QR decomposition of H(n) is expressed by: wherein R(n) is a lower triangular matrix with a dimension of M R ×M T , Q(n) is an orthonormal matrix with a dimension of M T ×M T and Q*(n) represents the complex conjugate transpose matrix of Q(n), and when Q(n)=[q 1 (n) q 2 (n) . . . q MT (n)], q m (n) represents the m-th column vector in the matrix Q(n), thus: N coders, coupled to the vector-coding matrix generator and used for receiving N transmission data vectors, wherein each transmission data vector has a dimension of M×1, and according to the vector-coding matrixes, the coders conduct coding on the transmission data vectors and each coder outputs M M M wherein M