Enhanced hierarchical modulation with interference cancellation for OFDM systems

Hierarchical modulation provides layered transmission and is a very promising mechanism to reliably provide basic services to receivers with various reception conditions. Because the high priority layer is allocated with more power, the low priority layer is vulnerable to noise and interference. This paper applies a repetition coding to either of the layers of hierarchical modulation to cancel the inter-carrier-interference, and thus the inter-layer-interference. More importantly, the proposed scheme provides a finer granularity of modulation order, which makes it more flexible to support various radio resource allocation.