| 摘要 |
<p>PURPOSE:To simply increase the subscriber capacity based on revision of an information transmission speed or the like by multiplying PN sequences in the state where the sequence is kept the same with the time phase along made different from each other to generate a spread sequence and allocating the sequence to channel. CONSTITUTION:When user information is inputted at a transmitter 21 through information input lines 23-28 at a predetermined transmission speed, spread processing is executed by spread modulators 29-34 by a spread sequence corresponding to a channel allocated to the user, and a synthesizer 35 synthesizes spread signals by plural users and sends the result. On the other hand, upon receipt of the synthesized spread signal at a receiver 22, the information is reproduced at a half of the information transmission speed by applying inverse spread processing by an inverse spread device 36 for the spread sequence of a channel number allocated to each user and the reproduced information is outputted from an information output line. Thus, even when a voice CODEC at one half of the current rate is applied in future, the subscriber capacity is increased from the standpoint of S/N.</p> |
