Enhanced Adaptive Modulation and Coding (AMC) Technique Using ILDPCA Coders for MIMO Systems

AMC has been adopted at the physical layer of several standard e, g 3GPP, 3GPP2, HIPERLAN/2, IEEE802.11a, IEEE 802.15.3 and IEEE 802.16. MIMO technology in coordination with Adaptive Modulation and Coding (AMC) scheme further enhances spectral efficiency by adjusting transmission parameters to the channel condition while satisfying a target error performance. Consequently, the combined MIMO-AMC technology is a promising solution to offer high throughput for next generation wireless systems. The system still has limitations in terms of channel estimation error, periodic performance drop, channel correlation resulting in reduced throughput and packet loss rate A cross layer design using Improved Low Density Parity Check Code (ILDPCA) in AMC on the physical layer and Incremental redundancy Hybrid ARQ (IR-HARQ) in the data link layer is proposed. ILDPCA coder in AMC enhances the performance of the system in terms of bit error rate, packet loss rate and spectral efficiency.