A CDMA system delivers message to N = 40 users with equal power. The message is transmitted at a rate of 10 kbps, using a DS spread spectrum signal operating at a chip rate of 2MHz. a. What is a bit period?b. What is a chip period?c. What is the processing gain of the system?
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A CDMA system delivers message to N = 40 users with equal power. The message is transmitted at a rate of 10 kbps, using a DS spread spectrum signal operating at a chip rate of 2MHz.
a. What is a bit period?
b. What is a chip period?
c. What is the processing gain of the system?
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- The information in an analog waveform, whose maximum frequency fm-4000Hz, is to be transmitted using a 16-level PAM system. The quantization must not exceed #1% of the peak-to peak analog signal. (a) What is the minimum number of bits per sample or bits per PCM word that should be used in this system? (b) What is the minimum required sampling rate, and what is the resulting bit rate? (c) What is the 16-ary PAM symbol Transmission rate?The information in an analog signal voltage waveform is to be transmitted over a PCM system with an accuracy of : 0.1 % of the peak-to-peak analog signal. The analog voltage waveform has a bandwidth of 43 Hz and an amplitude range of - 10 to 10 Vots. Determine the minimum bit rate fin bps) required in the PCM system? O a 688 O 774 O c 387 O d 86 Oe 258Q2/ The information in an analog signal voltage waveform is to be transmitted over a PCM system with an accuracy of ±0.1% (full scale). The analog voltage waveform has a bandwidth of 100 Hz and an amplitude range of -10 to +10 volts. Find the minimum sampling rate required. i) ii) Find minimum bit rate required in the PCM signal. Find the number of bits in each PCM word. iii) iv) Find the minimum absolute channel bandwidth required for the transmission of the PCM signal.
- Q2): consider a 3 kHz band limited voice signal sampled at 8000 sample/sec to be transmitted over a channel. The input variés from -3.8v to +3.8v and has average power of 30 mW. The required signal to quantization ratio is 20 dB. a. Determine the PCM data rate if a 32 synchronization bits are inserted every 224 data bits. b. Determine the minimum required transmission bandwidth if 20 PCM coders are time multiplexcd. c. Determine the RMS value of quantization noise.A 450 kHz carrier signal is modulated with a 15 kHz modulating signal. What are its sideband frequencies?(3) Five telemetry signals, each of bandwidth 1kHz, are to be transmitted simultaneously by binary PCM. The maximum tolerable error in sample amplitudes is 0.2% of the peak signal amplitude. The signals must be sampled at least 20% over the Nyquist rate. Framing and synchronizing require an additional 0.5% extra bits. Determine the minimum possible data rate that must be transmitted, and the minimum bandwidth required to transmit this signal.
- Answer all questions below: 1. Draw the general block diagram of Frequency Division Multiplexing (FDM) 2. Multiplexing is a technique that allows the (simultaneous) transmission of multiple signals across a single data link. Figure Q2 below shows a multiplexer with four 500 kbps data stream inputs and 1 data stream output where the unit of data is 1 bit. Determine: i. ii. iii. 500 kbps The type of multiplexing technique used. The input bit duration. The output bit rate. 500 kbps 500 kbps. 500 kbps. ... ... ... 1 0 1 0 1 0 1 0 0000 1 1 1 1 0 1 0 0 MUX Figure Q2 Frames 0101 0001 1101000101014. What parameter of a PPM signal varies in direct proportion to the message signal amplitude? a. the average frequency of the PPM pulses b. the distance between the PPM pulses c. the amplitude of the PPM pulses d. the width of the PPM pulses 5. What is the function of the prefilter in a PTM modulation circuit? completely removes frequencies greater than 8 kHz a. completely removes the PTM signal's first replica b. frequencies c. filters the message signal d. partially reconstructs and amplifies the message signal 6. What advantage does a PPM signal have over a PWM signal? a. can be used for message signals greater than 5 kHz b. requires lower sampling frequency c. easier to demodulate d. requires less transmission power 7. Why does PTM require a higher sampling frequency than PAM? a. The amplitude of PTM signals is constant. b. There are more sidebands in the first replica of a PTM c. Signal than in a PAM signal. d. A sample/hold circuit requires a higher sampling frequency. e. There…b) An 10 bits single channel PCM system gives an output of 102 kilo bit per second(kbps). Calculate: i. The sampling frequency of the system. ii. The highest possible modulating frequency of the system. iii. The bit duration of the system. iv. The Bandwidth of the system.
- Question 5: a) In the context of WCDMA, answer the following questions: What is the chip rate of WCDMA? i. ii. What is the duration for WCDMA frame? iii. For the figure shown below, what is the spreading factor? Symbol iv. V. vi. vii. Data Spreading code Spread signal Datax code Spreading What is the corresponding processing gain? For the figure shown below, what is the multiplexing mode used? Uplink Downlink Frequency Time WCDMA has a frequency reuse of 1 between different cells. What does that mean? If fast fading occurs when the path difference between two received signals is half wavelength. Calculate the path difference at a frequency equals to 2 GHz.a) Binary data at 9600 bits/sec are transmitted using 8-ary PAM baseband modulator system using a raised cosine roll off characteristic. The system has a frequency response up to 2.4 kHz. Find the symbol rate and the roll off factor. Also, Sketch the base band raised cosine spectrum.An analog signal with a bandwidth of 4.2 MHz is to be converted into binary PCM and transmit- ted over a channel. The peak-signal quantizing noise ratio at the receiver output must be at least 55 dB. (a) If we assume that P=0 and that there is no ISI, what will be the word length and the number of quantizing steps needed? (b) What will be the equivalent bit rate? (c) What will be the channel null bandwidth required if rectangular pulse shapes are used?