高通对eCall的详细介绍，其中有对eCall的基本知识普及，目录如下： Table of Contents [1] Introduction ......................... 2 [2] Terms ................................ 3 [3] References ........................... 4 [4] The eCall System ..................................

The increasing need for high data-rate transmissions over time- or frequency-selective fading channels has drawn attention to modulation schemes with high spectral efficiency such as QAM. With the aim of increasing the “diversity order” of the signal