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Unformatted text preview: ECE 562 Fall 2011 November 17, 2011 HOMEWORK ASSIGNMENT 7 Due Date: December 6, 2011 (in class) 1. True or False. Determine if the following statements are True or False. You need to provide a brief justification for your answer to get credit. (a) If the mobile speed is 72 km/hr, the carrier frequency is 900 MHz, and symbol rate for communication is 10 symbols a second, then the mobile experiences slow fading. (b) In wireless communication, if the speed of the mobile is doubled the delay spread is also doubled. (c) A wireless channel with τ ds = 10- 4 seconds and f max = 100 Hz operating with a bandwidth of 1 . 25 MHz is a flat fading channel. (d) For a fixed γ b , P b for binary DPSK signaling over a slow flat fading channel is always larger than P b without fading, irrespective of the distribution of the fading. 2. Useful Result. Show that Z ∞ Q ( √ x ) e- x/γ γ dx = 1 2 1- r γ 2 + γ ....
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- Fall '09
- Diversity scheme, Rayleigh fading, flat fading channel, Rician Fading