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Hybrid ultrawideband modulations compatible for both coherent and transmit-reference receivers

Zhao, Shiwei; Orlik, Philip; Molisch, Andreas LU ; Liu, Huaping and Zhang, Jinyun (2007) In IEEE Transactions on Wireless Communications 6(7). p.2551-2559
Abstract
This paper considers signaling schemes for heterogeneous ultrawideband communications networks that contain both coherent (rake) and transmitted-reference (TR) receivers. While coherent receivers are capable of receiving TR signals, they do so with a 3 dB penalty, because they cannot make use of the energy invested into the reference pulse. We propose a new signaling scheme that avoids this drawback, by encoding redundant information on the reference pulse. The resulting scheme does not affect the operation of a TR receiver, while recovering the 3 dB penalty and furthermore providing an additional 1.7 dB coding gain to a coherent uncoded binary scheme. This can be explained by interpreting the scheme as a trellis-coded modulation. We also... (More)
This paper considers signaling schemes for heterogeneous ultrawideband communications networks that contain both coherent (rake) and transmitted-reference (TR) receivers. While coherent receivers are capable of receiving TR signals, they do so with a 3 dB penalty, because they cannot make use of the energy invested into the reference pulse. We propose a new signaling scheme that avoids this drawback, by encoding redundant information on the reference pulse. The resulting scheme does not affect the operation of a TR receiver, while recovering the 3 dB penalty and furthermore providing an additional 1.7 dB coding gain to a coherent uncoded binary scheme. This can be explained by interpreting the scheme as a trellis-coded modulation. We also provide an alternative implementation that can be viewed as a recursive systematic convolutional encoder. Combining this version further with a simple forward error correction encoder results in a concatenated code that can be decoded iteratively, providing a bit-error rate of 10(-3) at 2.8 dB signal-to-noise ratio in additive white Gaussian noise. The convergence behavior of this iterative code is analyzed by using extrinsic information transfer charts. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
transmit-reference, convolutional code, recursive systematic, iterative decoding, coherent rake, EXIT chart, ultrawideband
in
IEEE Transactions on Wireless Communications
volume
6
issue
7
pages
2551 - 2559
publisher
IEEE--Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • wos:000247984000025
  • scopus:34547394207
ISSN
1536-1276
DOI
10.1109/TWC.2007.05892
language
English
LU publication?
yes
id
13e3ba6a-e11a-46a2-9a4c-9aee9cace51d (old id 645748)
date added to LUP
2007-12-19 11:54:57
date last changed
2017-09-03 04:40:43
@article{13e3ba6a-e11a-46a2-9a4c-9aee9cace51d,
  abstract     = {This paper considers signaling schemes for heterogeneous ultrawideband communications networks that contain both coherent (rake) and transmitted-reference (TR) receivers. While coherent receivers are capable of receiving TR signals, they do so with a 3 dB penalty, because they cannot make use of the energy invested into the reference pulse. We propose a new signaling scheme that avoids this drawback, by encoding redundant information on the reference pulse. The resulting scheme does not affect the operation of a TR receiver, while recovering the 3 dB penalty and furthermore providing an additional 1.7 dB coding gain to a coherent uncoded binary scheme. This can be explained by interpreting the scheme as a trellis-coded modulation. We also provide an alternative implementation that can be viewed as a recursive systematic convolutional encoder. Combining this version further with a simple forward error correction encoder results in a concatenated code that can be decoded iteratively, providing a bit-error rate of 10(-3) at 2.8 dB signal-to-noise ratio in additive white Gaussian noise. The convergence behavior of this iterative code is analyzed by using extrinsic information transfer charts.},
  author       = {Zhao, Shiwei and Orlik, Philip and Molisch, Andreas and Liu, Huaping and Zhang, Jinyun},
  issn         = {1536-1276},
  keyword      = {transmit-reference,convolutional code,recursive systematic,iterative decoding,coherent rake,EXIT chart,ultrawideband},
  language     = {eng},
  number       = {7},
  pages        = {2551--2559},
  publisher    = {IEEE--Institute of Electrical and Electronics Engineers Inc.},
  series       = {IEEE Transactions on Wireless Communications},
  title        = {Hybrid ultrawideband modulations compatible for both coherent and transmit-reference receivers},
  url          = {http://dx.doi.org/10.1109/TWC.2007.05892},
  volume       = {6},
  year         = {2007},
}