Abstract
The multicarrier communication is studied. Two special forms -OFDM multicarrier communication and wavelet-packet based multicarrier communication are presented. Multicarrier communication is the principle of transmitting data by divid ing the stream into several parallel bit streams, each of which has a much lower bit rate, and by using these sub-streams to modulate several carriers. It tends to be more robust against time domain impulse interference due to long symbol time. However, the sub-carriers may lose their mutual orthogonality if rapid time-variations frequency error of the channel occurs. OFDM multicarrier communication has densely spaced sub-carriers and overlapping spectra. Its time-domain waveforms are chosen such that mutual orthogonality is ensured even though sub-carrier spectra may overlap. OFDM with raised cosine filter multicarrier communication use steep bandpass filters that completely separate the spectrum of individual sub-carriers. Wavelet-packet based multicarrier communication employs wavelet-packets to be the pulse-shaping filters for sub-channels. The spectra overlap both in frequency-domain and in time-domain but their discrimination at the receiving end is guaranteed due to the orthogonality of the wavelets-packet functions. The system models of the two forms are proposed, analytical probabilities of error with frequency dispersion and AWGN are given, and the results of simulation are presented.
Huang, Lin (1998). Performance of OFDM and wavelet-packet based multicarrier communication. Master's thesis, Texas A&M University. Available electronically from
https : / /hdl .handle .net /1969 .1 /ETD -TAMU -1998 -THESIS -H83.