2. (10pts) Suppose the binary bit stream "10110101" is sent using w/4-DQPSK, with the left most bits applied to the transmitter first. The two QPSK constellations are shown in Fig. 2. The bit mapping is given in Table 1. Assume using Fig. 2(a) as the starting QPSK constellation. Assuming that Oo-0. i) Determine the carrier phase 0, the in-phase component / and the quadrature component Qk, for the input sequence. ii) Specify in sequence the constellation symbols used to transmit the input sequence (specify which QPSK constellation, e.g. for r₁ in (a), write (a)). 32 "01" "00" 23 "11" "10" @ "01" Figure 2: Problem 2 (mik, mok) 00 01 /4 3/4 TA 11 10 Table 1: 5л/4 7/4 "00" (b) "10"

2. (10pts) Suppose the binary bit stream "10110101" is sent using w/4-DQPSK, with the left most bits applied to the transmitter first. The two QPSK constellations are shown in Fig. 2. The bit mapping is given in Table 1. Assume using Fig. 2(a) as the starting QPSK constellation. Assuming that Oo-0. i) Determine the carrier phase 0, the in-phase component / and the quadrature component Qk, for the input sequence. ii) Specify in sequence the constellation symbols used to transmit the input sequence (specify which QPSK constellation, e.g. for r₁ in (a), write (a)). 32 "01" "00" 23 "11" "10" @ "01" Figure 2: Problem 2 (mik, mok) 00 01 /4 3/4 TA 11 10 Table 1: 5л/4 7/4 "00" (b) "10"

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Consider a CDMA system where transmitter A has the code 101010 and transmitter B has the code 111001. Assume that 1 is represented by +1V and 0 is represented by -1V. Show that the two CDMA codes (after mapping them to voltages) are orthogonal to each other. What is transmitted if A sends a bit of 0 and B sends a bit of 1? What did A and B most likely transmit if the received word is “-1 -1 -1 +1 +1 +1”?
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For the picture attached below the parameters are the following: f1 = 400 Hz m(t) = sin(2 fmt), where fm = 300 Hz. Assume ideal LPFs with a cut-o frequency of f1. What would be the value of frequency f2 be so that the carrier frequency is 2.5kHz? What modification of this system is required to generate USSB (at the same carrier frequency)? ( Note: this does not involbe changing the oscillator frequencies)
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PROBLEM 1. Binary data has to be transmitted over a telephone link that has a usable bandwidth of 3000Hz and a maximum achievable signal-to-noise power ratio of 6 dB at its output.. a. Determine the maximum signaling rate and probability of error if a coherent ASK scheme is used for transmitting binary data through this channel. b. If the data is maintained at 300 bits/sec, calculate the error probability.