Abstract
Mobile communication always suffer serious frequency-selective fading due to multipath. Traditional spreading codes are characterized by the fact that the time-domain orthogonality is based on fixed chip width across code length. They may not perform satisfactorily under frequency-selective fading. This paper proposes a new class of CDMA code, wavelet-packet orthogonal codes capable to retain time-domain orthogonality as well as to provide intra-code subband diversity to mitigate frequency-selective fading. The new codes are constructed by congregating several wavelet waveforms with various dilations and shifts. The combination of the wavelet waveforms in different nodes in a wavelet-packet full binary tree enables frequency diversity capability. Owing to the length of even chips, they can facilitate implementing multi-rate streaming and multi-bit spreading. The performance study is carried using statistics correlation distribution convolution (SCDC) algorithm and the results reveal that wavelet-packet codes with multi-band components, combined with RAKE, perform pretty well under frequency-selective fading.
| Original language | English |
|---|---|
| Title of host publication | Conference Record / IEEE Global Telecommunications Conference |
| Publisher | IEEE |
| Pages | 1590-1594 |
| Number of pages | 5 |
| Volume | 3 |
| Publication status | Published - 2000 |
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All Science Journal Classification (ASJC) codes
- Electrical and Electronic Engineering
- Global and Planetary Change
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Approach to mitigate frequency-selective fading - design of multi-band wavelet packet spreading codes with intra-code subband diversity. / Chen, Hsiao-Hwa.
Conference Record / IEEE Global Telecommunications Conference. Vol. 3 IEEE, 2000. p. 1590-1594.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
TY - GEN
T1 - Approach to mitigate frequency-selective fading - design of multi-band wavelet packet spreading codes with intra-code subband diversity
AU - Chen, Hsiao-Hwa
PY - 2000
Y1 - 2000
N2 - Mobile communication always suffer serious frequency-selective fading due to multipath. Traditional spreading codes are characterized by the fact that the time-domain orthogonality is based on fixed chip width across code length. They may not perform satisfactorily under frequency-selective fading. This paper proposes a new class of CDMA code, wavelet-packet orthogonal codes capable to retain time-domain orthogonality as well as to provide intra-code subband diversity to mitigate frequency-selective fading. The new codes are constructed by congregating several wavelet waveforms with various dilations and shifts. The combination of the wavelet waveforms in different nodes in a wavelet-packet full binary tree enables frequency diversity capability. Owing to the length of even chips, they can facilitate implementing multi-rate streaming and multi-bit spreading. The performance study is carried using statistics correlation distribution convolution (SCDC) algorithm and the results reveal that wavelet-packet codes with multi-band components, combined with RAKE, perform pretty well under frequency-selective fading.
AB - Mobile communication always suffer serious frequency-selective fading due to multipath. Traditional spreading codes are characterized by the fact that the time-domain orthogonality is based on fixed chip width across code length. They may not perform satisfactorily under frequency-selective fading. This paper proposes a new class of CDMA code, wavelet-packet orthogonal codes capable to retain time-domain orthogonality as well as to provide intra-code subband diversity to mitigate frequency-selective fading. The new codes are constructed by congregating several wavelet waveforms with various dilations and shifts. The combination of the wavelet waveforms in different nodes in a wavelet-packet full binary tree enables frequency diversity capability. Owing to the length of even chips, they can facilitate implementing multi-rate streaming and multi-bit spreading. The performance study is carried using statistics correlation distribution convolution (SCDC) algorithm and the results reveal that wavelet-packet codes with multi-band components, combined with RAKE, perform pretty well under frequency-selective fading.
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M3 - Conference contribution
VL - 3
SP - 1590
EP - 1594
BT - Conference Record / IEEE Global Telecommunications Conference
PB - IEEE
ER -