Improved spread-spectrum communication with a wavelet packet based transceiver

In a previous work by Lindsey (see PhD. Dissertation, Ohio University, 1994) wavelet packet modulation was introduced as a viable coding and M-ary orthogonal modulation strategy for improved communication performance, especially in scenarios where traditional quadrature amplitude modulation (QAM) is currently in use. A most important application of wavelet packet modulation is in direct sequence spread spectrum communications, where the chip symbols determined by the pseudo-noise sequence are constructed with both time and frequency dimensionality. In traditional DSPN, the wide bandwidth of the symbols causes problems in the presence of frequency-domain noise where all chip symbols are corrupted, but the time-frequency dimensionality of spread spectrum wavelet packet modulation (SSWPM) has immediate advantages in mitigating the effects of narrowband jammers and time impulses, where only a fraction of the chip symbols are corrupted.