| 摘要 |
<p>A digital cellular base station (22) having minimum hardware requirements readily adapted to support high speed communication is disclosed herein. It includes a digital signal processor base band processor and modulator (24), a high-speed, high resolution digital-to-analog converter (26), a RF modulator (30) and an antenna (32). An input signal couples to the digital signal base-band processing modulator (24) for processing. The high-speed, high resolution digital-to-analog converter (26) couples to receive the processed signal and converts the signal into an analog one. The high-speed, high resolution digital-to-analog converter (DAC) (26) has off-line sigma delta conversion and storage which enables it to directly generat a modulated signal at an intermediate frequency, typically on the order of 100 MHz. Incorporation of DAC (26) reduces the amount of hardware necessary for the cellular base-station (22). The RF modulator (30) receives the DAC (26) output and modulates the signal to a broadcasting frequency, typically on the order of 1G Hz. Antenna (32) couples to receive and transmit the modulated signal.</p> |
