Patent ID: 8223853
Filing Date: 2012-07-17
Classification: H04L

Abstract:
1. A receiver configured to decode a received signal having layered modulation data, the receiver comprising: an RF processor configured to receive the layered modulation data and configured to frequency convert the layered modulation data to substantially a baseband frequency; a base layer decoder coupled to the RF processor and configured to decode a base layer data from the layered modulation data; an enhancement layer decoder coupled to the RF processor and configured to decode an enhancement layer data from the layered modulation data, the enhancement layer decoder operating substantially independent of the base layer decoder; and a channel estimator coupled to the RF processor and configured to generate a channel estimate corresponding to a channel carrying the layered modulation data, wherein the channel estimator is configured to compare a component of the channel estimate to a threshold value and select as an updated channel estimate component one of a predetermined value and the channel estimate component, based in part on the comparison; wherein each of the base layer decoder and enhancement layer decoder comprises a bit metric module configured to determine a log likelihood ratio based in part on the layered modulation data; wherein the base layer decoder and the enhancement layer decoder are configured to concurrently process a same received layered modulation constellation point from the layered modulation data; wherein the layered modulation data comprises alternating bits from the base layer data and the enhancement layer data within each received layered modulation constellation point, and a received layered modulation constellation that follows Gray mapping.