Title :
Digital predistortion of frequency multiplier for dual band wireless LAN transmitter
Author :
Choi, Jae Hong ; Kang, Sung Min ; Koo, Kyung Heon
Author_Institution :
Dept. of Electron. Eng., Incheon Univ., South Korea
Abstract :
In this paper, a digital predistortion technique to linearize frequency multiplier for dual-band wireless LAN transmitter is presented. The frequency multiplier is used to generate 5.8GHz wireless LAN signal by multiplying 2.9GHz input, however, it distorts the input OFDM signal severely. This paper has analyzed the nonlinear distortion of the frequency multiplier by modeling it as a memoryless Volterra system, and proposed a simple digital predistortion algorithm to get the proper 5GHz band wireless LAN signal. The linearized frequency doubler shows 20.1 dB and 19dB ACPR improvement, respectively at 11MHz and 20MHz offset from center frequency by using the proposed predistortion linearization.
Keywords :
frequency multipliers; linearisation techniques; nonlinear distortion; radio transmitters; wireless LAN; 11 MHz; 2.9 GHz; 20 MHz; 5 GHz; 5.8 GHz; digital predistortion technique; dual band wireless LAN transmitter; frequency doublers; frequency multipliers; input OFDM signal distortion; memoryless Volterra system; nonlinear distortion; predistortion linearization; Algorithm design and analysis; Dual band; Frequency; Nonlinear distortion; OFDM; Predistortion; Signal analysis; Signal generators; Transmitters; Wireless LAN;
Conference_Titel :
Microwave Symposium Digest, 2005 IEEE MTT-S International
Print_ISBN :
0-7803-8845-3
DOI :
10.1109/MWSYM.2005.1517136
