... 41)= c( t − 1), c( t − 2), , c( t − 42)∗A.(11)Let C( t) = [c( t), c( t−1), , c( t−41)], then for any n ≥ t,from (11)wehave C( n)= C( t) ∗ An−t. (12)Therefore, as long as C( t) for a time instance ... networks for critical information transmission, se-curity has become an urgent issue and a bottleneck for newwireless communication services such as wireless mobile In-ternet and e-commerce [1]. ... counter-parts.Direct sequence spread-spectrum system, also knownas code-division multiple access (CDMA), was historicallydeveloped for secure communication and military use. InCDMA systems, each user...