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各种各样的移动通信标准即使在将来仍会继续存在，因此开发一种多制式的手持终端将是非常重要的。这个手持终端不仅能够在地区和全球漫游，而且能够减少改造传统技术、引入新技术的费用。采用软件无线电技术实现的手持终端具有极大的灵活性,它能够通过更换应用程序（如调制、均
It is important to develop a multi-mode hand-held terminal, even though the various mobile communications standards will continue to exist in the future. The hand-held terminal not only roam the region and the world, but also reduce the cost of the transformation of traditional technologies, the introduction of new technologies. Handheld terminals implemented using software radio technology offer great flexibility by replacing applications such as modulation