Perhaps you should try some spelling variations:
"modified channel optimisation algorithm" » "modified channel optimization algorithms", "modified channel estimation algorithm", "modified channel estimation algorithms"
"modified parameter optimization algorithm" » "modified parameter optimization algorithms", "modified parameter estimation algorithm", "modified parameter estimation algorithms", "modified parameters optimization algorithm"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified channel optimisation algorithm") OR ("modified parameter optimization algorithm"))~.
• Removing quotes may allow a broader search: (( modified channel optimisation algorithm ) or ( modified parameter optimization algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified channel optimisation algorithm") or ("modified parameter optimization algorithm"))*.