| 摘要 |
<p>An invention of spread spectrum multiple access code for digital wireless communication system including any CDMA and spread spectrum system is disclosed. The code is consisted of a group of orthogonal basic pulse train with unit amplitude, unit width and different polarity. The number of basic pulses is determined by the practical requirements. The interval between the basic pulses at time coordinate are unequal. By using this nonuniform pulse location and polarity encoding scheme, the sidelobes of the auto-correlation and cross-correlation function of the codes can be controlled to the least degree. It will make the design of a CDMA system simpler and the designed CDMA system will have larger capacity that the present ones in order to solve the day by day increasing contradiction between the needs of wireless communication capacity and limited frequency resource.</p> |
