{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

hw5_soln - ECE 562 Fall 2011 November 9 2011 SOLUTIONS TO...

This preview shows pages 1–2. Sign up to view the full content.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: ECE 562 Fall 2011 November 9, 2011 SOLUTIONS TO HOMEWORK ASSIGNMENT 5 1. Differential Detector and Noncoherent Orthogonal Modulation. Show that for binary DPSK, the non coherent detector based on the two-symbol interval statistic Y n is the same as the differential detector (see notes). Ans: The noncoherent detector is ˆ m n ( Y n ) = arg max m =1 , 2 |h Y n , ˜ s m i| with ˜ s 1 = √ E 1 1 , ˜ s 2 = √ E- 1 1 Thus ˆ m n ( Y n ) = 1 if | R n + R n- 1 | ≥ | R n- R n- 1 | 2 otherwise = 1 if Re[ R n R ? n- 1 ] ≥ 2 otherwise 2. To track or not to track the phase. Consider a BPSK system with an imperfect phase reference, and a BDPSK system with differential detection. Assume that the data rates, transmit powers, and noise PSD’s for the two systems are the same. Let P b (BSPK ,φ ) and P b (BDPSK) denote the respective bit error rates for communication. Find the value of phase error φ for which P b (BSPK ,φ ) = P b (BDPSK) = 10- 6 ....
View Full Document

{[ snackBarMessage ]}

Page1 / 5

hw5_soln - ECE 562 Fall 2011 November 9 2011 SOLUTIONS TO...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online