| Paper: | L-CC-4 |
| Session: | Coding and Communications |
| Session Time: | Wednesday, October 8, 16:00 - 18:00 |
| Presentation Time: | Wednesday, October 8, 17:00 - 17:20 |
| Title: |
MULTI-MODE SUB-NYQUIST RATE DIGITAL-TO-ANALOG CONVERSION FOR DIRECT WAVEFORM SYNTHESIS |
| Authors: |
Stanley Yuan-Shih Chen; University of California, Berkeley | | |
| | Nam-Seog Kim; University of California, Berkeley | | |
| | Jan M. Rabaey; University of California, Berkeley | | |
| Abstract: |
This paper describes the sub-Nyquist rate digital-to-analog conversion technique for a direct waveform synthesis (DWS) transmitter. IEEE 802.22 TV band Cognitive Radio (CR) transmitter requires seamless frequency hoping and wide frequency coverage of 54MHz-806MHz. The proposed transmitter directly converts the digital baseband samples to RF frequencies in the target channels obviating the up-conversion mixer. The mostly-digital architecture of this transmitter features agile functionality support for Software Defined Radio (SDR) operation. A 10-bit 600-MS/s multi-mode DAC shapes the analog output spectrum envelope to enhance image spectrum located in the target channels and suppress other unwanted harmonics. Compared to Nyquist rate direct synthesis, this sub-Nyquist rate DWS architecture reduces both system complexity and power consumption by half. |
