Modem architecture for joint source channel decoding

摘要

A modem architecture that supports the application of joint source channel decoding (JSCD). The modem architecture includes two channel decoders, one of which is modified to provide improved signal quality. The modem architecture further includes transparent network layers that enable the passage of data from one layer to another layer. For example, the modem architecture enables the passage soft bits, when available, from a physical layer to an application layer. The soft bits may be utilized for JSCD, packet loss concealment, or other applications. The modem architecture enables encryption and decryption of data to incorporate extrinsic information in operating JSCD.

主权项

1. A method for decoding a source signal, comprising:
generating first hard bits and first soft bits by decoding a packet carrying at least one encoded frame of the source signal using a first turbo decoder; and responsive to a determination that the first hard bits generated by the first turbo decoder fail an error check, generating second hard bits and second soft bits by decoding the packet using a second turbo decoder; wherein the generated first hard bits and the generated second hard bits indicate respective decoding decisions for the encoded frame, the generated first soft bits indicate a reliability of the generated first hard bits, and the generated second soft bits indicate a reliability of the generated second hard bits.