APPARATUS AND METHOD FOR SUPPORT OF COMMUNICATIONS SERVICES AND APPLICATIONS OVER RELATIVELY LOW SIGNAL-TO-NOISE RATIO LINKS

摘要

A physical layer (PL) frame generation method is provided. A PL payload is generated by encoding and modulating source data based on a first modcod of a first set. A synchronization header, comprising a first unique word (UW) (designed to facilitate efficient and reliable detection by terminals of a relatively low SNR operating range), and a modcod field (which indicates the first modcod scheme), is appended to the PL payload. A PL header is appended to the synchronization header and PL payload to form the PL frame. The PL header comprises a second UW and physical layer signaling (PLS). The PLS comprises encoded data fields reflecting a length of the PL frame, where the fields are encoded based on a second modcod scheme of a second set. The first modcod set is designed for SNR operating levels relatively lower than the SNR operating levels of the second modcod set.

主权项

1. A method for generating a physical layer (PL) data frame for transmission over a wireless communications network, the method comprising:
generating a PL data payload by encoding and modulating one or more source data frames in accordance with a first modulation and coding (modcod) scheme selected from a first set of modcod schemes; appending a synchronization (sync) header to the PL data payload, wherein the sync header comprises a first unique word (UW), and a modcod field that indicates the first modcod scheme; and appending a PL header to the combined sync header and PL data payload to form the PL data frame, wherein the PL header comprises a second UW and physical layer signaling (PLS) data, wherein the PLS data comprises encoded data fields reflecting information indicating a length of the PL data frame, and wherein the data fields are encoded in accordance with a second modcod scheme selected from a second set of modcod schemes; wherein each modcod scheme of the second set is designed for terminals of a second signal-to-noise ratio (SNR) operating range, and each modcod scheme of the first set is designed for terminals of a first SNR operating range that is relatively lower than the second SNR operating range.