Long codes for generalized FH-OFDMA through unknown multipath channels

Shengli Zhou; Georgios B. Giannakis; Anna Scaglione

doi:10.1109/26.917778

Long codes for generalized FH-OFDMA through unknown multipath channels

Shengli Zhou
, Georgios B. Giannakis
, Anna Scaglione

Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

41 Scopus citations

Abstract

A generalized frequency-hopping (GFH) orthogonal frequency-division multiple-access (OFDMA) system is developed in this paper as a structured long code direct-sequence code-division multiple-access (DS-CDMA) system in order to bridge frequency-hopped multicarrier transmissions with long code DS-CDMA. Through judicious code design, multiuser interference is eliminated deterministically in the presence of unknown frequency-selective multipath channels. Thanks to frequency-hopping, no single user suffers from consistent fading effects and constellation-irrespective channel indentifiability is guaranteed regardless of channel nulls. A host of blind channel estimation algorithms are developed trading off complexity with performance. Two important variants, corresponding to slow- and fast-hopping, are also addressed with the latter offering symbol recovery guarantees. Performance analysis and simulation results illustrate the merits of GFH-OFDMA relative to conventional OFDMA and long code DS-CDMA with pseudorandom noise codes and RAKE reception.

Original language	English (US)
Pages (from-to)	721-733
Number of pages	13
Journal	IEEE Transactions on Communications
Volume	49
Issue number	4
DOIs	https://doi.org/10.1109/26.917778
State	Published - Apr 2001

Bibliographical note

Funding Information:
Paper approved by L. Wei, the Editor for CDMA Systems of the IEEE Communications Society. Manuscript received November 1, 1999; revised April 16, 2000 and July 30, 2000. This work was supported by the National Science Foundation Wireless Initiative Grant 99-79443 and the ARL under Grant DAAL01-98-Q-0648. This paper was presented in part at the Wireless Communications and Networking Conference (WCNC), Chicago, IL, September 23–28, 2000.

Keywords

Blind channel estimation
Frequency-hopping
Multicarrier CDMA
Multipath fading channels
Spread spectrum systems

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10.1109/26.917778

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title = "Long codes for generalized FH-OFDMA through unknown multipath channels",

abstract = "A generalized frequency-hopping (GFH) orthogonal frequency-division multiple-access (OFDMA) system is developed in this paper as a structured long code direct-sequence code-division multiple-access (DS-CDMA) system in order to bridge frequency-hopped multicarrier transmissions with long code DS-CDMA. Through judicious code design, multiuser interference is eliminated deterministically in the presence of unknown frequency-selective multipath channels. Thanks to frequency-hopping, no single user suffers from consistent fading effects and constellation-irrespective channel indentifiability is guaranteed regardless of channel nulls. A host of blind channel estimation algorithms are developed trading off complexity with performance. Two important variants, corresponding to slow- and fast-hopping, are also addressed with the latter offering symbol recovery guarantees. Performance analysis and simulation results illustrate the merits of GFH-OFDMA relative to conventional OFDMA and long code DS-CDMA with pseudorandom noise codes and RAKE reception.",

keywords = "Blind channel estimation, Frequency-hopping, Multicarrier CDMA, Multipath fading channels, Spread spectrum systems",

author = "Shengli Zhou and Giannakis, \{Georgios B.\} and Anna Scaglione",

note = "Funding Information: Paper approved by L. Wei, the Editor for CDMA Systems of the IEEE Communications Society. Manuscript received November 1, 1999; revised April 16, 2000 and July 30, 2000. This work was supported by the National Science Foundation Wireless Initiative Grant 99-79443 and the ARL under Grant DAAL01-98-Q-0648. This paper was presented in part at the Wireless Communications and Networking Conference (WCNC), Chicago, IL, September 23–28, 2000.",

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N2 - A generalized frequency-hopping (GFH) orthogonal frequency-division multiple-access (OFDMA) system is developed in this paper as a structured long code direct-sequence code-division multiple-access (DS-CDMA) system in order to bridge frequency-hopped multicarrier transmissions with long code DS-CDMA. Through judicious code design, multiuser interference is eliminated deterministically in the presence of unknown frequency-selective multipath channels. Thanks to frequency-hopping, no single user suffers from consistent fading effects and constellation-irrespective channel indentifiability is guaranteed regardless of channel nulls. A host of blind channel estimation algorithms are developed trading off complexity with performance. Two important variants, corresponding to slow- and fast-hopping, are also addressed with the latter offering symbol recovery guarantees. Performance analysis and simulation results illustrate the merits of GFH-OFDMA relative to conventional OFDMA and long code DS-CDMA with pseudorandom noise codes and RAKE reception.

AB - A generalized frequency-hopping (GFH) orthogonal frequency-division multiple-access (OFDMA) system is developed in this paper as a structured long code direct-sequence code-division multiple-access (DS-CDMA) system in order to bridge frequency-hopped multicarrier transmissions with long code DS-CDMA. Through judicious code design, multiuser interference is eliminated deterministically in the presence of unknown frequency-selective multipath channels. Thanks to frequency-hopping, no single user suffers from consistent fading effects and constellation-irrespective channel indentifiability is guaranteed regardless of channel nulls. A host of blind channel estimation algorithms are developed trading off complexity with performance. Two important variants, corresponding to slow- and fast-hopping, are also addressed with the latter offering symbol recovery guarantees. Performance analysis and simulation results illustrate the merits of GFH-OFDMA relative to conventional OFDMA and long code DS-CDMA with pseudorandom noise codes and RAKE reception.

KW - Blind channel estimation

KW - Frequency-hopping

KW - Multicarrier CDMA

KW - Multipath fading channels

KW - Spread spectrum systems

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Long codes for generalized FH-OFDMA through unknown multipath channels

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Keywords

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