Symbol spreading for ultrawideband systems based on multiband OFDM
(2004) IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, 2004 2. p.1204-1209- Abstract
- We investigate the effect of symbol spreading on the performance of ultrawideband systems based on multiband OFDM. Ultrawideband channels offer the possibility of very high frequency diversity, as the used bandwidth is much larger than the coherence bandwidth of the channel. In multiband-OFDM, frequency diversity stems from (i) forward error correction coding, which distributes the symbols associated with one bit among different tones, and (ii) interleaving, which distributes the symbols among different employed frequency bands. We show that for weak (rate 3/4) error correcting codes, the achieved diversity order is insufficient. However, the use of Walsh-Hadamard spreading gives additional diversity within each frequency band and greatly... (More)
- We investigate the effect of symbol spreading on the performance of ultrawideband systems based on multiband OFDM. Ultrawideband channels offer the possibility of very high frequency diversity, as the used bandwidth is much larger than the coherence bandwidth of the channel. In multiband-OFDM, frequency diversity stems from (i) forward error correction coding, which distributes the symbols associated with one bit among different tones, and (ii) interleaving, which distributes the symbols among different employed frequency bands. We show that for weak (rate 3/4) error correcting codes, the achieved diversity order is insufficient. However, the use of Walsh-Hadamard spreading gives additional diversity within each frequency band and greatly improves the performance. Furthermore, we propose a novel scheme for grouping OFDM tones before the spreading is performed. This grouping gives additional flexibility in the system design. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/600761
- author
- Ramachandran, I ; Nakache, Y P ; Orlik, P ; Zhang, J and Molisch, Andreas LU
- organization
- publishing date
- 2004
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- keywords
- diversity reception, error correction codes, forward error correction, telecommunication channels, ultra wideband communication, OFDM modulation
- host publication
- 15th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2004.
- volume
- 2
- pages
- 1204 - 1209
- conference name
- IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, 2004
- conference location
- Barcelona, Spain
- conference dates
- 2004-09-05 - 2004-09-08
- external identifiers
-
- scopus:11244275591
- ISBN
- 0-7803-8523-3
- language
- English
- LU publication?
- yes
- id
- 14cf0377-997b-4afc-9015-6772050e8f7e (old id 600761)
- alternative location
- http://ieeexplore.ieee.org/iel5/9435/29981/01373889.pdf?tp=&isnumber=&arnumber=1373889
- date added to LUP
- 2016-04-04 14:37:27
- date last changed
- 2022-01-30 02:17:17
@inproceedings{14cf0377-997b-4afc-9015-6772050e8f7e, abstract = {{We investigate the effect of symbol spreading on the performance of ultrawideband systems based on multiband OFDM. Ultrawideband channels offer the possibility of very high frequency diversity, as the used bandwidth is much larger than the coherence bandwidth of the channel. In multiband-OFDM, frequency diversity stems from (i) forward error correction coding, which distributes the symbols associated with one bit among different tones, and (ii) interleaving, which distributes the symbols among different employed frequency bands. We show that for weak (rate 3/4) error correcting codes, the achieved diversity order is insufficient. However, the use of Walsh-Hadamard spreading gives additional diversity within each frequency band and greatly improves the performance. Furthermore, we propose a novel scheme for grouping OFDM tones before the spreading is performed. This grouping gives additional flexibility in the system design.}}, author = {{Ramachandran, I and Nakache, Y P and Orlik, P and Zhang, J and Molisch, Andreas}}, booktitle = {{15th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2004.}}, isbn = {{0-7803-8523-3}}, keywords = {{diversity reception; error correction codes; forward error correction; telecommunication channels; ultra wideband communication; OFDM modulation}}, language = {{eng}}, pages = {{1204--1209}}, title = {{Symbol spreading for ultrawideband systems based on multiband OFDM}}, url = {{http://ieeexplore.ieee.org/iel5/9435/29981/01373889.pdf?tp=&isnumber=&arnumber=1373889}}, volume = {{2}}, year = {{2004}}, }