Title :
Freqency Compensation Scheme using Polar Coordinate Function for Burst Transmission Wireless Modem
Author :
Nakase, Hiroyuki ; Kawamura, Yusuke ; Yamaguchi, Atsuyoshi ; Oguma, Hiroshi ; Kameda, Suguru ; Takagi, Tadashi ; Tsubouchi, Kazuo
Author_Institution :
Res. Inst. of Electr. Commun., Tohoku Univ., Sendai
Abstract :
New frequency compensation circuit has been proposed using preamble symbols and some pilot symbols. The proposed circuit had a performance of compensation with the offset of 50 ppm at 2.4 GHz carrier. Initial phase detection and course frequency compensation was achieved from 16-symbol preamble. Minimum mean square scheme was used for evaluation of initial phase and frequency error from phase information of preamble symbols. Accurate compensation of residual frequency offset was operated from the phase information of pilot symbols inserted placed in information payload. Wireless packet modem has been implemented on field programmable gate array (FPGA). Conversion from rectangle coordinates function to polar coordinate function was employed for simple signal processing. Division calculator by bit shifts and lookup table by read only memory (ROM) were used for compact circuit design. Degradation of measured BER from ideal performance was confirmed to be less than 2.5 dB
Keywords :
error statistics; field programmable gate arrays; least mean squares methods; modems; radiocommunication; read-only storage; signal processing; table lookup; 2.4 GHz; BER; FPGA; ROM; bit error rate; burst transmission; field programmable gate array; frequency compensation circuit; frequency offset; lookup table; minimum mean square scheme; phase detection; phase information; pilot symbol; polar coordinate function; preamble symbol; read only memory; rectangle coordinates function; signal processing; wireless packet modem; Array signal processing; Circuit synthesis; Degradation; Field programmable gate arrays; Frequency; Modems; Payloads; Phase detection; Read only memory; Table lookup;
Conference_Titel :
Communication systems, 2006. ICCS 2006. 10th IEEE Singapore International Conference on
Conference_Location :
Singapore
Print_ISBN :
1-4244-0411-8
Electronic_ISBN :
1-4244-0411-8
DOI :
10.1109/ICCS.2006.301549
