Blocking (radio)

In radio, and wireless communications in general, blocking is a condition in a receiver in which an off-frequency signal (generally further off-frequency than the immediately adjacent channel) causes the signal of interest to be suppressed.^[1]

Blocking rejection is the ability of a receiver to tolerate an off-frequency signal and avoid blocking. A good automatic gain control design is part of achieving good blocking rejection.^[2]

References

1. ^ Qizheng Gu (2005). RF system design of transceivers for wireless communications. Springer. p. 271. ISBN 9780387241616. http://books.google.com/books?id=dAGfSkX3_vgC&pg=PA278&dq=agc+blocking&as_brr=3&ei=GinlSuOtJIiwkASbj7W2DA#v=onepage&q=blocking&f=false. 
2. ^ Ian Hickman (2007). Practical radio-frequency handbook (4th ed.). Newnes. p. 161. ISBN 9780750680394. http://books.google.com/books?id=lvcrO8AxyxcC&pg=PA161&dq=agc+blocking&as_brr=3&ei=HCzlSqDPC4_8lASSuujnCw#v=onepage&q=agc%20blocking&f=false.