Publications-Detail
Improving UMTS LTE Performance by UEP in High Order Modulation
- Authors:
- Lüders, H. , Minwegen, A. , Vary, P.
- Book Title:
- 7th International Workshop on Multi-Carrier Systems & Solutions (MC-SS 2009)
- Publisher:
- Springer
- Pages:
- p.p. 185 - 194
- Address:
- Herrsching, Germany
- Date:
- May. 2009
- ISBN:
- 978-9-04812-529-6
- Language:
- English
Abstract
In this contribution we investigate the performance of the UMTS Long Term Evolution (LTE) physical layer using turbo coding and 64QAM with Gray mapping. We show how the mapping of systematic and parity bits to the six different bit positions defining one complex 64QAM symbol influences the convergence of the turbo decoder and thereby the bit error rate (BER) performance as well as number of necessary decoding iterations. Exploiting the unequal error protection (UEP) property of Gray mapped 64QAM results in an SNR performance gain of approximately 2 dB for the non-iterative system and in addition leads to a significant reduction of the necessary decoding iterations when iterative decoding is performed.Download
BibTeX- Copyright © by IKS
lueders09a.pdf - This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.