This book presents the state-of-the-art regarding the modeling and analysis of a number of narrowband mobile-to-mobile (M2M) fading channels in cooperative systems. The book covers both geometry-based and non-geometrical stochastic channel models assuming non-line-of-sight as well as line-of-sight propagation conditions. Statistical quantities, such as the temporal autocorrelation function, space-time cross-correlation functions, probability density function, cumulative distribution function, level-crossing rate, and average duration of fades are discussed in detail. Next, a thorough evaluation of the channel capacity statistics of M2M fading channels in cooperative networks appears in the book. Lastly, the book sheds light on the performance of M2M cooperative systems under different propagation environments. Thus, several measures like the statistics of the instantaneous signal-to-noise ratio, average bit error probability, amount of fading, and outage probability are explored. It can easily be claimed that the performance assessment reported here bridges the gap between the derived M2M channel models and their impact on the performance of the deployed cooperative systems.