Receiver Design for Downlink MIMO MC-CDMA in Cognitive Radio Systems
Year
: 2010
Abstract: Multiuser interference (MUI) and co-space
interference (CSI) are two challenging issues in design of
multicarrier code-division multiple-access (MC-CDMA) systems
when multiple antennas are used at both the transmitter and
receiver sides (MIMO transmission). On the other hand, in
cognitive radio (CR) system, the secondary users that use MCMCDA
technique must deactivate the subcarriers used by the
primary users. This leads to loss of orthogonality of the
conventional spreading codes such as Hadamard Walsh codes. In
this paper, we have modified two recently proposed linear
receivers to be deployed in MIMO MC-CDMA based CR
downlink transmission where some of the subcarriers are turned
off. To solve the resultant non-orthogonality problem, the
complex carrier interferometry (CI) codes are utilized that exist
for any length. The first method, called total interference
cancellation (CI-TIC), is able to completely eliminate the CSI and
the MUI. The other method is called CI symbol-chip level
minimum mean square error (CI-SC-MMSE) that shows
superior bit error performance with respect to CI-TIC. For
different scenarios, simulation results show that the proposed CI
based receivers are able to effectively mitigate the MUI and the
CSI in comparison with the case where Hadamard Walsh codes
are utilized.
interference (CSI) are two challenging issues in design of
multicarrier code-division multiple-access (MC-CDMA) systems
when multiple antennas are used at both the transmitter and
receiver sides (MIMO transmission). On the other hand, in
cognitive radio (CR) system, the secondary users that use MCMCDA
technique must deactivate the subcarriers used by the
primary users. This leads to loss of orthogonality of the
conventional spreading codes such as Hadamard Walsh codes. In
this paper, we have modified two recently proposed linear
receivers to be deployed in MIMO MC-CDMA based CR
downlink transmission where some of the subcarriers are turned
off. To solve the resultant non-orthogonality problem, the
complex carrier interferometry (CI) codes are utilized that exist
for any length. The first method, called total interference
cancellation (CI-TIC), is able to completely eliminate the CSI and
the MUI. The other method is called CI symbol-chip level
minimum mean square error (CI-SC-MMSE) that shows
superior bit error performance with respect to CI-TIC. For
different scenarios, simulation results show that the proposed CI
based receivers are able to effectively mitigate the MUI and the
CSI in comparison with the case where Hadamard Walsh codes
are utilized.
Keyword(s): cognitive radio,downlink MC-CDMA,
MIMO,SVD,space-frequency spreading,MMSE
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Receiver Design for Downlink MIMO MC-CDMA in Cognitive Radio Systems
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| contributor author | مرتضی رجب زاده اوغاز | en |
| contributor author | حسین خوش بین قماش | en |
| contributor author | Morteza Rajabzadeh | fa |
| contributor author | Hossein Khoshbin Ghomash | fa |
| date accessioned | 2020-06-06T13:59:11Z | |
| date available | 2020-06-06T13:59:11Z | |
| date copyright | 9/26/2010 | |
| date issued | 2010 | |
| identifier uri | http://libsearch.um.ac.ir:80/fum/handle/fum/3377607?locale-attribute=en | |
| description abstract | Multiuser interference (MUI) and co-space interference (CSI) are two challenging issues in design of multicarrier code-division multiple-access (MC-CDMA) systems when multiple antennas are used at both the transmitter and receiver sides (MIMO transmission). On the other hand, in cognitive radio (CR) system, the secondary users that use MCMCDA technique must deactivate the subcarriers used by the primary users. This leads to loss of orthogonality of the conventional spreading codes such as Hadamard Walsh codes. In this paper, we have modified two recently proposed linear receivers to be deployed in MIMO MC-CDMA based CR downlink transmission where some of the subcarriers are turned off. To solve the resultant non-orthogonality problem, the complex carrier interferometry (CI) codes are utilized that exist for any length. The first method, called total interference cancellation (CI-TIC), is able to completely eliminate the CSI and the MUI. The other method is called CI symbol-chip level minimum mean square error (CI-SC-MMSE) that shows superior bit error performance with respect to CI-TIC. For different scenarios, simulation results show that the proposed CI based receivers are able to effectively mitigate the MUI and the CSI in comparison with the case where Hadamard Walsh codes are utilized. | en |
| language | English | |
| title | Receiver Design for Downlink MIMO MC-CDMA in Cognitive Radio Systems | en |
| type | Conference Paper | |
| contenttype | External Fulltext | |
| subject keywords | cognitive radio | en |
| subject keywords | downlink MC-CDMA | en |
| subject keywords | MIMO | en |
| subject keywords | SVD | en |
| subject keywords | space-frequency spreading | en |
| subject keywords | MMSE | en |
| identifier link | https://profdoc.um.ac.ir/paper-abstract-1018083.html | |
| conference title | 21st Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications-PIMRC 2010 | en |
| conference location | استانبول | fa |
| identifier articleid | 1018083 |