MIMO COMMUNICATION METHOD, MIMO TRANSMITTING DEVICE, AND MIMO RECEIVING DEVICE

摘要

A first digital signal sequence including I and Q digital signal sequences is obtained, the first digital signal sequence being obtained by multiplying each bit of an I-sequence and a Q-sequence in a digital signal sequence system by a first code among codes constituting n-th order (n is an integer) orthogonal codes. A second digital signal sequence is obtained by multiplying I and Q digital signal sequences by a first coefficient greater than 1, the I and Q digital signal sequences being obtained by multiplying each of the bits in the I-sequence and the Q-sequence in the digital signal sequence system by a first code among codes constituting 2n-th order orthogonal codes. The first digital signal sequence and the second digital signal sequence are added on a bit-by-bit basis to create one digital signal sequence, and the one digital signal sequence is transmitted from a single antenna.

主权项

1. A multiple-input and multiple-output (MIMO) communication method having N (N is an integer greater than or equal to 2) transmit antennas, the MIMO communication method comprising:
obtaining a first digital signal sequence including I and Q digital signal sequences, the first digital signal sequence being obtained by multiplying each bit of an I-sequence and a A-sequence in a digital signal sequence system by a first code among codes constituting n-th order (n is an integer) orthogonal codes, and obtaining a second digital signal sequence by multiplying I and Q digital signal sequences by a first coefficient greater than 1, the I and Q digital signal sequences being obtained by multiplying each bit of the I-sequence and the Q-sequence in the digital signal sequence system by a first code among codes constituting 2n-th order orthogonal codes; adding the first digital signal sequence and the second digital signal sequence on a bit-by-bit basis to create a first composite digital signal sequence; transmitting the first composite digital signal sequence from a first transmit antenna after performing an inverse fast Fourier transform on the first composite digital signal sequence; obtaining a third digital signal sequence including I and Q digital signal sequences, the third digital signal sequence being obtained by multiplying each bit of the I-sequence and the Q-sequence in the digital signal sequence system by a second code among the codes constituting the n-th order orthogonal codes; obtaining a fourth digital signal sequence by multiplying I and Q digital signal sequences by the first coefficient greater than 1, the I and Q digital signal sequences being obtained by multiplying each bit of the I-sequence and the Q-sequence in the digital signal sequence system by a second code among the codes constituting the 2n-th order orthogonal codes; adding the third digital signal sequence and the fourth digital signal sequence on a bit-by-bit basis to create a second composite digital signal sequence; and transmitting the second composite digital signal sequence from a second transmit antenna after performing an inverse fast Fourier transform on the second composite digital signal sequence.