Diversity Fairness in Tomlinson-Harashima Precoded Multiuser MIMO Through Retransmission
2013 (English)In: IEEE Signal Processing Letters, ISSN 1070-9908, E-ISSN 1558-2361, Vol. 20, no 4, 375-378 p.Article in journal (Refereed) Published
In this letter, we study the diversity unfairness associated with the conventional Tomlinson-Harashima precoding (THP) in multiuser multiple-input multiple-output downlink transmission. A single-retransmission scheme that combines two THP signals at each user with a complementary multi-user suppression order is investigated. For a system with M antennas at the transmitter and a single antenna at each user, the proposed scheme provides a diversity order M+1 for all users and ensures diversity fairness. We study two retransmission policies, where the users either consider only the current received codeword or combine both codewords for decoding. An asymptotic analysis of the outage probability for both THP retransmission schemes is provided. In addition, a power allocation policy that minimizes the outage probability and accommodates the same coding gain at each user is discussed by formulating a geometric optimization problem.
Place, publisher, year, edition, pages
2013. Vol. 20, no 4, 375-378 p.
Decoding, Diversity methods, Diversity reception, Downlink, Encoding, Gain, MIMO, Diversity, MIMO downlink, THP, fairness, outage probability
IdentifiersURN: urn:nbn:se:kth:diva-120192DOI: 10.1109/LSP.2013.2248362ISI: 000316225000008OAI: oai:DiVA.org:kth-120192DiVA: diva2:613766
QC 201306032013-04-022013-04-022013-06-03Bibliographically approved