| 摘要 |
<p>The present invention relates to a wireless multiple-input multiple-output (MIMO) communication device comprising N plurality of antennas (110(1)-110(N)), a single integrated circuit and a baseband signal processor (120). The integrated circuit comprises an integrated MIMO transceiver (150) for simultaneously transmitting L signals over a channel to a second communication device (200) having M antennas (210(1)-210(M)). The transceiver has a plurality ofN transmitters (152(1)-152(N)), each coupled to a corresponding one of the plurality ofN antennas. The baseband signal processor (120) is coupled to the integrated circuit to process a vector s representing the L signals [s 1 ... s L ] with a transmit matrix A that is computed to maximize capacity of the channel by multiplying the vector s with the transmit matrix A, wherein L <= Rank of a matrix H H H and H represents a channel response from the transceiver to the second device. The transmit matrix A is equal to VD, where V is an eigenvector matrix for H H H, D = diag(d 1 ,...,d L ) and |d p | 2 is the transmit power for p = 1 to L. The MIMO device is configured to transmit according to a power constraint for each individual transmit antenna path, wherein if N ‰¤ M, then D = I . sqrt(P max /N), with I as an identity matrix, such that the power transmitted by each of the N plurality of antennas is the same and equal to P max /N and if N>M, then D = sqrt(d . P max /N) . I , such that the power transmitted by antenna i for i = 1 to N is (d . P max /N) . ( VV H ) ii , and d p = d for p = 1 to L.</p> |
