Equalizer's Use Limitation for Complexity Reduction in a Green Radio Receiver

Table 1

Computational complexity of ISI estimation.

Method of ISI estimation	Computational complexity
ISI^LS	CC^LSISI=2𝑃𝐿^2+𝑃𝐿+𝐿+(𝐿−1)𝐿^2𝐿!−1
ISI^LMS	CC^LMSISI=2𝐿𝑃+𝑃+𝐿−1
ISI^CMA	CC^CMAISI=𝑁(2𝐿^2+𝐿+4)+𝐿−1
ISI^inter	CC^interISI=2𝐿−1+∑^𝐿−1𝑖=1(𝑃−𝑖)