(a) Time Division Multiplexing (TDM) can be used to transmit several Pulse Code Modulation (PCM) channels...
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(a) Time Division Multiplexing (TDM) can be used to transmit several Pulse Code Modulation (PCM) channels along a single communications link. A system uses a PCM sampling frequency of 25 kHz to convert audio signals in the range 20 Hz to 10 kHz into digital form. A 10-bit code is used to define the sample levels with an input voltage range of 0 to 5V. Several signals are sent along one carrier using TDM. The TDM's clock rate of each PCM channel is 2MHz. Several PCM channels are transmitted down a single TDM link. (i) Calculate the time needed to transmit a single 10-bit PCM sample at a clock rate of 2MHz. [2 marks] (ii) How many sampling levels are available using a 10-bit code? (iii) Calculate the resolution. Table 1: QPSK Modulator (b) For the QPSK modulator with reference carrier oscillator of cos coct and phase shift of -90°, determine the absent information as shown in Table 1. [4 Marks] QIQ+I+ BMQ 0 0 -1 -1-sin(wet) -cos(w.t) 0 1 -1 1 0 +1 -1 1 1 +1 +1 BMI Summer [2 marks] -sin (wet) -cos(wet) +1-sin(wet) cos(wet) -sin (wet)+cos(wet) [2 marks] QPSK Output Phase +135⁰ +45 (a) Time Division Multiplexing (TDM) can be used to transmit several Pulse Code Modulation (PCM) channels along a single communications link. A system uses a PCM sampling frequency of 25 kHz to convert audio signals in the range 20 Hz to 10 kHz into digital form. A 10-bit code is used to define the sample levels with an input voltage range of 0 to 5V. Several signals are sent along one carrier using TDM. The TDM's clock rate of each PCM channel is 2MHz. Several PCM channels are transmitted down a single TDM link. (i) Calculate the time needed to transmit a single 10-bit PCM sample at a clock rate of 2MHz. [2 marks] (ii) How many sampling levels are available using a 10-bit code? (iii) Calculate the resolution. Table 1: QPSK Modulator (b) For the QPSK modulator with reference carrier oscillator of cos coct and phase shift of -90°, determine the absent information as shown in Table 1. [4 Marks] QIQ+I+ BMQ 0 0 -1 -1-sin(wet) -cos(w.t) 0 1 -1 1 0 +1 -1 1 1 +1 +1 BMI Summer [2 marks] -sin (wet) -cos(wet) +1-sin(wet) cos(wet) -sin (wet)+cos(wet) [2 marks] QPSK Output Phase +135⁰ +45
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i PARTA fs 25 kHz n 10 Rb nfs R 250 kbps 25k Samples per seco... View the full answer
Related Book For
International Business Law and Its Environment
ISBN: 978-0324649659
7th Edition
Authors: Richard schaffer, Filiberto agusti, Beverley earle
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