CDMA
If we categorize wireless phone systems by their access method , we can classify each system into one of three categories. These access categories are frequency division multiple access( FDMA), time-division multiple access(TDMA),and code-division multiple access(CDMA),with the later representing the focus of this chapter.
This chapter will first describe and discuss the work of Qualcomm, which is the company that primarily developed a large portion of CDMA technologies . Once this is accomplished ,the chapter will examine the technology associated with CDMA, as well as the transmission of data as the wireless access method .Because CDMA was selected recently as the basis for a new generation of broadband wireless transmission ,the chapter will conclude by focusing on this

如果把無線電話系統(tǒng)按照它們的接入方式分類，我們可以將每個系統(tǒng)歸到以下三類：頻分多址(FDMA),時分多址(TDMA)和碼分多址（CDMA）,其中后者是本文的重點。
本文首先描述并討論Qualcomm公司的工作，該公司是首先發(fā)展CDMA技術的公司。然后討論與CDMA相關的技術和基于這種無線接入的數據傳輸。由于 CDMA在最近被選為新一代寬帶無線傳輸系統(tǒng)的基礎。
演變