1. Lathi, B.P. and Ding, Z., 1998. Modern digital and analog communication systems (Vol. 3, pp. 184-187). New York: Oxford university press.
2. Proakis, J.G. and Salehi, M., 2001. Digital communications (Vol. 4, pp. 593-620). New York: McGraw-hill.

Online Resources:
1. NPTEL, Principles of Modern CDMA/MIMO/OFDM Wireless Communications, IIT Kanpur (Prof. Aditya K. Jagannatham) — covers OFDM system design, cyclic prefix, and subcarrier modulation in detail: https://nptel.ac.in/courses/117104115