Title :
Coding limits for short range wireless infrared transmission
Author :
Wolf, Michael ; Haardt, Martin
Author_Institution :
Commun. Res. Lab., Ilmenau Univ. of Technol.
Abstract :
Wireless infrared is an attractive alternative for short-range indoor communications. However, mainly as a result of the physical properties of the detector, one serious problem is the power efficiency of the transmission. Under the assumptions of a fixed average optical power and additive white Gaussian noise, we derive the maximum coding gains attainable with optimized on-off keying, where "optimized" refers to the probability of the logical "1" pulses in the transmitted data stream. Uncoded on-off keying acts as the reference scheme. We also consider orthogonal pulse-position modulation, having favorable spectral characteristics, with and without additional coding and compare the corresponding coding gains with the limits for binary transmission
Keywords :
AWGN channels; amplitude shift keying; binary codes; indoor radio; infrared detectors; probability; pulse position modulation; additive white Gaussian noise; binary transmission; coding gains; data stream; detector; fixed average optical power; indoor communication; on-off keying; orthogonal pulse-position modulation; probability; short range wireless infrared transmission; spectral characteristics; Modulation coding; Optical filters; Optical modulation; Optical noise; Optical pulses; Optical receivers; Optical sensors; Optical transmitters; Pulse modulation; Radio frequency;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2005. PIMRC 2005. IEEE 16th International Symposium on
Conference_Location :
Berlin
Print_ISBN :
9.7838007291e+012
DOI :
10.1109/PIMRC.2005.1651604
