| 摘要 |
<p>A determinant expressing the relation between the sequence of symbol vectors b(k) transmitted from L communicators through code division multiplexing and the sequence of compressed-back output vectors y(k) of received signals taking the cross correlation of the spread-spectrum sequence of the sequence of the vectors b(k) into account is limited within the range of from k-g to k+g where k is the symbol timing and g is the symbol time. The compressed-back outputs of the received signals within the limited range are inputted to a shift register having 2g+1 stages. A partial correlation matrix calculating section (26) calculates partial correlation matrixes R?k+h (1), Rk+h¿ (0), and Rk+h (-1) with respect to h=-g,..., g at every symbol interval within the limited range. An inverse correlation matrix calculating section (27) produces the correlation matrix R¿k? for the spread-spectrum sequences which respectively corresponds to the L communicators from the partial correlation matrixes and calculates the inverse correlation matrix Rk?-1¿ of the correlation matrix R¿k?. A multiplier (25) produces an estimated sequence of symbol vectors by calculating the product of the inverse correlation matrix Rk?-1¿ and the sequence Yk of the compressed-back outputs y(k) from the register (24).</p> |
