The "signal" is basic RF principles, regarding EIRP loss and gain. CCNA Wireless would actually help your understanding in this area. As far as LTE and other cellular technologies go, they would be similar. The main difference would be that 801.11 wireless (wifi) uses an unlicensed RF band where LTE uses a licensed band so the FCC or some other regulatory domain authority comes into play.
There are several good guides for wireless and I would recomend Cisco Press Wireless Fundamentals and or CWNA. You will see that different wireless methods use different modulation techniques etc however they do not discuss LTE or WiMAX in the CCNP or CCIE. Most vendor cetifications look mainly at the RF baics and the deployment of their products. Cisco isn't really and exception in that but is the market leader and really has the most mature wireless certification package. CWNP covers principles in greater detail, IMHO.
CWNP who run the CWNA certification program also have their own certifications that you may wish to persue to the CWNE (expert level). As CWNP is vendor neutral they cover most of the core concepts and highlight some of the difference that manufacturers use. These differences may be in the authentication techniques such as Ruckus dynamic PSK, Xirrus sector antennas or Meru single channel architectures.