Abstract
This paper proposes the novel technique of multilevel threshold based soft quantization (MLT-SQ) for a multiple access relay system (MARS). The scheme is suitable for systems using binary phase-shift keying (BPSK) and network coding at the relay. In the proposed MLT-SQ protocol, the relay evaluates the reliabilities, expressed as log-likelihood ratios (LLRs), of the received signals from the two sources. It then computes the LLRs of the network-coded packet and quantizes these using a set of optimized multilevel thresholds, forwarding the resulting “quantized soft symbols” to the destination. We provide the derivation for the bit error rate (BER) at the destination, based on which we optimize the multilevel thresholds to minimize the BER. Compared to competing schemes, the performance of our system is superior in terms of BER when the same amount of channel state information (CSI) is exploited.
Original language | English |
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Title of host publication | 25th IEEE Annual Symposium on Personal, Indoor and Mobile Radio Communications Conference, PIMRC 2014 |
Place of Publication | Piscataway |
Publisher | Institute of Electrical and Electronics Engineers |
Pages | 464-468 |
Number of pages | 5 |
ISBN (Electronic) | 978-1-4799-4912-0 |
ISBN (Print) | 978-1-4799-4911-3 |
DOIs | |
Publication status | Published - 2014 |
Externally published | Yes |
Event | 25th IEEE Annual International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2014 - Washington, United States Duration: 2 Sept 2014 → 5 Sept 2014 Conference number: 25 http://pimrc2014.ieee-pimrc.org |
Conference
Conference | 25th IEEE Annual International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2014 |
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Abbreviated title | PIMRC 2014 |
Country/Territory | United States |
City | Washington |
Period | 2/09/14 → 5/09/14 |
Internet address |