发明名称 |
METHOD AND APPARATUS FOR LAYERED MODULATION |
摘要 |
Improvements to a layered modulation (LM) implementation are disclosed. The present invention discloses two implementations of LM, using single and multiple transponders per signal frequency, respectively. Layered hierarchical 8PSK (H-8PSK) is a special case of LM. By re-encoding the high-priority (HP) portion of an H-8PSK signal, LM can improve carrier-to-noise ratio (CNR) of a H-8PSK signal. LM can be computer-simulated and a two-layered signal can be sequentially demodulated with a predicted CNR performance. An LM signal can be simulated using live signals for off-line processing. In addition, a signal processing apparatus can process in real time LM signals emulated from live satellite signals. |
申请公布号 |
EP1529347(A1) |
申请公布日期 |
2005.05.11 |
申请号 |
EP20030742393 |
申请日期 |
2003.07.03 |
申请人 |
THE DIRECTV GROUP, INC. |
发明人 |
CHEN, ERNEST, C.;SANTORU, JOSEPH |
分类号 |
H04B1/38;H04B7/185;H04B17/00;H04L5/16;H04L27/18;H04L27/34 |
主分类号 |
H04B1/38 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|