Opportunistic contention-based feedback protocol for downlink OFDMA systems with mixed traffic
An opportunistic feedback protocol is proposed for orthogonal frequency division multiple access (OFDMA) systems with mixed realtime (RT) and non-realtime (NRT) traffic. This protocol allocates a dedicated feedback channel for each RT user, while it allows all NRT users to compete to send feedback v...
| Main Authors: | , , , |
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| Format: | Proceeding Paper |
| Language: | English English |
| Published: |
Springer Link
2009
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/6581/ http://irep.iium.edu.my/6581/1/6581_Opportunistic%20contention_complete.pdf http://irep.iium.edu.my/6581/2/6581_Opportunistic%20contention_SCOPUS.pdf |
| _version_ | 1848776693675720704 |
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| author | Patachaianand, Rachod Sandrasegaran, Kumbesan Mohd. Ramli, Huda Adibah Basukala, Riyaj |
| author_facet | Patachaianand, Rachod Sandrasegaran, Kumbesan Mohd. Ramli, Huda Adibah Basukala, Riyaj |
| author_sort | Patachaianand, Rachod |
| building | IIUM Repository |
| collection | Online Access |
| description | An opportunistic feedback protocol is proposed for orthogonal frequency division multiple access (OFDMA) systems with mixed realtime (RT) and non-realtime (NRT) traffic. This protocol allocates a dedicated feedback channel for each RT user, while it allows all NRT users to compete to send feedback via a contention-based random access feedback channel. The proposed feedback protocol requires a fixed amount of resource to carry feedback from all RT users and some selected NRT users. The probability that NRT users attempt to send feedback is based on two parameters: a channel quality threshold, and the number of subcarriers (or clusters) whose channel quality is above the threshold. Simulation results demonstrate that allocating a dedicated feedback channel for RT user improves the achievable throughput significantly compared with allocating a dedicated traffic channel. For NRT users, the achievable sum rate of the proposed protocol when the number of users is moderate (20-50 users) approaches the ideal case when the channel quality of all users is known at the base station. The sum rate also is close to the ideal case when the number contention minislots per subcarrier is as low as 2 minislot per subcarrier. |
| first_indexed | 2025-11-14T14:34:09Z |
| format | Proceeding Paper |
| id | iium-6581 |
| institution | International Islamic University Malaysia |
| institution_category | Local University |
| language | English English |
| last_indexed | 2025-11-14T14:34:09Z |
| publishDate | 2009 |
| publisher | Springer Link |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | iium-65812017-08-21T09:06:47Z http://irep.iium.edu.my/6581/ Opportunistic contention-based feedback protocol for downlink OFDMA systems with mixed traffic Patachaianand, Rachod Sandrasegaran, Kumbesan Mohd. Ramli, Huda Adibah Basukala, Riyaj TK5101 Telecommunication. Including telegraphy, radio, radar, television An opportunistic feedback protocol is proposed for orthogonal frequency division multiple access (OFDMA) systems with mixed realtime (RT) and non-realtime (NRT) traffic. This protocol allocates a dedicated feedback channel for each RT user, while it allows all NRT users to compete to send feedback via a contention-based random access feedback channel. The proposed feedback protocol requires a fixed amount of resource to carry feedback from all RT users and some selected NRT users. The probability that NRT users attempt to send feedback is based on two parameters: a channel quality threshold, and the number of subcarriers (or clusters) whose channel quality is above the threshold. Simulation results demonstrate that allocating a dedicated feedback channel for RT user improves the achievable throughput significantly compared with allocating a dedicated traffic channel. For NRT users, the achievable sum rate of the proposed protocol when the number of users is moderate (20-50 users) approaches the ideal case when the channel quality of all users is known at the base station. The sum rate also is close to the ideal case when the number contention minislots per subcarrier is as low as 2 minislot per subcarrier. Springer Link 2009 Proceeding Paper PeerReviewed application/pdf en http://irep.iium.edu.my/6581/1/6581_Opportunistic%20contention_complete.pdf application/pdf en http://irep.iium.edu.my/6581/2/6581_Opportunistic%20contention_SCOPUS.pdf Patachaianand, Rachod and Sandrasegaran, Kumbesan and Mohd. Ramli, Huda Adibah and Basukala, Riyaj (2009) Opportunistic contention-based feedback protocol for downlink OFDMA systems with mixed traffic. In: 10th Pacific-Rim Conference on Multimedia (PCM 2009), 15-18 December 2009, Bangkok, Thailand. http://dx.doi.org/10.1007/978-3-642-10467-1 10.1007/978-3-642-10467-1_115 |
| spellingShingle | TK5101 Telecommunication. Including telegraphy, radio, radar, television Patachaianand, Rachod Sandrasegaran, Kumbesan Mohd. Ramli, Huda Adibah Basukala, Riyaj Opportunistic contention-based feedback protocol for downlink OFDMA systems with mixed traffic |
| title | Opportunistic contention-based feedback protocol for downlink OFDMA systems with mixed traffic |
| title_full | Opportunistic contention-based feedback protocol for downlink OFDMA systems with mixed traffic |
| title_fullStr | Opportunistic contention-based feedback protocol for downlink OFDMA systems with mixed traffic |
| title_full_unstemmed | Opportunistic contention-based feedback protocol for downlink OFDMA systems with mixed traffic |
| title_short | Opportunistic contention-based feedback protocol for downlink OFDMA systems with mixed traffic |
| title_sort | opportunistic contention-based feedback protocol for downlink ofdma systems with mixed traffic |
| topic | TK5101 Telecommunication. Including telegraphy, radio, radar, television |
| url | http://irep.iium.edu.my/6581/ http://irep.iium.edu.my/6581/ http://irep.iium.edu.my/6581/ http://irep.iium.edu.my/6581/1/6581_Opportunistic%20contention_complete.pdf http://irep.iium.edu.my/6581/2/6581_Opportunistic%20contention_SCOPUS.pdf |