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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Okada, H. Yamazato, T. Katayama, M. |
| Copyright Year | 2002 |
| Description | Author affiliation: Center for Inf. Media Studies, Nagoya Univ., Japan (Okada, H.; Yamazato, T.; Katayama, M.) |
| Abstract | A CDMA unslotted ALOHA system is a connectionless-type of CDMA packet communication system. In this system, a user station can transmit a packet asynchronously and randomly, and so the packet birth/death event is one of the most important problems for multiuser detection. We have proposed the CDMA unslotted ALOHA system using an adaptive filter receiver based on minimum mean square error criterion of Okada, Grant, Band and Ogawa (see IEEE International Symposium on Personal, Indoor and Mobile Radio Communication (PIMRC), Sep. 2000), and shown the improvement in the throughput performance even considering the effect of birth/death event. The ensemble-averaged squared error, however, increases at the point of packet birth. In this paper, we employ interleaving and forward error correction (FEC) coding techniques to mitigate the momentary increase in ensemble-averaged squared error. The use of FEC, however, causes the increase in MAI due to redundancy bits of FEC. Moreover, signal power is reduced under the condition that the energy of an information bit is the same. In such cases, whether an adaptive filter can operate effectively or not interests us. We evaluate the system performance and show that the improvement in throughput is achieved with interleaving and FEC techniques. |
| Sponsorship | Vodafone Siemens Ericsson Lucent Technol. IEEE Instituto Superior Tecnico EiC IEE IEEE Commun. Soc |
| Starting Page | 941 |
| Ending Page | 945 |
| File Size | 474122 |
| Page Count | 5 |
| File Format | |
| ISBN | 0780375890 |
| DOI | 10.1109/PIMRC.2002.1047360 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2002-09-18 |
| Publisher Place | Portugal |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Interleaved codes Throughput Multiaccess communication Adaptive systems Forward error correction Adaptive filters Multiuser detection Receivers Mean square error methods Land mobile radio |
| Content Type | Text |
| Resource Type | Article |
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