Abstract
In all digital communication systems, a general objective is the efficient use of the available resources, that is, bandwidth, power, and complexity, to achieve a specified performance goal. For the case where the host signal size is large, spread transforming can be employed. Spread transforming (ST) technique is inspired by spread-spectrum (SS) modulation scheme. In SS communications, the information signal is spread in bandwidth prior to transmission and then despread in bandwidth by the same factor at the receiver. Although this scheme keeps the total transmitted signal power unchanged, it reduces the power spectral density of the narrow-band noise signal introduced during transmission through despreading. Dually, ST increases the embedding distortion to noise distortion ratio at the extractor by sacrificing the signal size. On the contrary, when the signal size is small, multiple codebook data hiding method can be used. In strictly bandwidth limited communication systems, an efficient error control scheme, based on set-partitioning of an expanded constellation, is employed to improve the performance. A key to the success of this scheme is the increased minimum distance between the codewords that enables more reliable decoding of the sent message.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
