Circuit Sage Tools
RFSim99 is a free linear S-parameter based circuit simulator offering schematic capture, simulation, 1 port and 2 port S-parameter display and file support, tolerance analysis, stability circles, and much more.
Nathan Iyer's Cascade:
Calculate Gain, NF, IIP3, Sensitivity from individual data of receiver's blocks
An Introduction to GSM by S. Redl:
Product Description Discusses the global system for mobile communications. Of interest to engineers and technicians who want a comprehensive introduction to GSM
GSM System Engineering by A. Mehrotra:
from description:"...Here is a comprehensive look at the global system for mobile communications from an engineer's viewpoint. GSM System Engineering covers the architecture, protocols, and time and frequency domain representation, as well as the important issues of network maintenance and management of mobility, subscribers, and security..."