Open Radio Access Network (O-RAN) Systems Architecture and Design, Second Edition provides a jumpstart to engineers developing O-RAN hardware and software systems, presenting a top-down approach to O-RAN systems design. It gives an introduction into why wireless systems look the way they do before introducing relevant O-RAN and 3GPP standards. The remainder of the book discusses hardware and software aspects of O-RAN system design, including dimensioning and performance targets.