When utilizing all subcarrier activation patterns in the combinatorial index modulation (IM) scheme, existing techniques either fail to realize the maximum possible throughput enhancement or fail to address the bit-level synchronization issue (or error propagation) due to the variable-length nature of the index-domain codebook. To address these drawbacks, we propose using Huffman coding for IM together with two constellation mappings for the bandpass modulation. The proposed scheme induces no signal overhead and is applicable when the index-domain codebook has the maximum encoding rate. Simulations demonstrate the effectiveness of the proposed scheme in mitigating bit-level synchronization errors.
|Pages (from-to)||426 - 429|
|Number of pages||4|
|Journal||IEEE Communications Letters|
|Early online date||25 Dec 2018|
|Publication status||Published - Mar 2019|
Bibliographical note© 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
- Huffman coding