| 摘要 |
<p>A code division multiplexing method and system are provided, the method comprises the following steps: constructing the basic grouped perfect orthogonal complemented code pairs mate; modulating the C code and S code of the said basic grouped perfect orthogonal complemented code pairs mate which are arrayed consecutively in time order onto M orthogonal carriers or M orthogonal polarization electric waves; shifting the modulated basic grouped perfect orthogonal complemented code pairs mate consecutively. The code division multiplexing method and system of the invention, make the average time bandwidth product of each carrier signal close to 1 using the orthogonal multi-carriers; the method and system maintain the "zero correlation windows" characteristic among the address code groups, at the same time, make the code utilization coefficient more than 1 using the shift superposition; in the case of losing the "zero correlation windows" among the address code groups but maintaining the orthogonality among the address code groups, the method and system make the code utilization coefficient outclass 1 using the shift superposition, so that the system can have very high frequency spectrum efficiency in the case of only using the low dimension modulation.</p> |
