thats gr8 idea i never thought of to measure per channel power . thanks a ton. my HOA is a novel one and i am really not advised to share it till i make it to some publication. i hope u understand my concern . but i have seen another thing if i change my data rate beyond 40 Gbps the simulation time is drastically reduced for same powers but at 10 Gbps time taken is too long. though gain remians almost same but OSNR is drastically reduced. its probably that noise power increases at high data rates .