(a) A noiseless 4 kHz channel is sampled every 1 msec and each sample is either...
(a) A noiseless 4 kHz channel is sampled every 1 msec and each
sample is either a 0 or 1.
What is the maximum data rate? How does the maximum data rate
change if the channel is
noisy, with a signal-to-noise ratio of 30 dB?
(b) A CDMA receiver gets the following chips: (-1 +1 -3 +1 -1 -3 +1
+1). The chip sequences of
each station is shown as follows.
A = ( -1 -1 -1 +1 +1 -1 +1 +1 )
B = ( -1 -1 +1 -1 +1 +1 +1 -1 )
C = ( -1 +1 -1 +1 +1 +1 -1 -1 )
D = ( -1 +1 -1 -1 -1 -1 +1 -1 )
Which stations transmitted, and which bits did each one send?
Homework Answers
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(a) A noiseless 4 kHz channel is sampled every 1 msec and each
sample is either...
1. (1.5 points) A CDMA receiver gets the following chips: (+1 -1 +3 -1 +1 +3...
1. (1.5 points) A CDMA receiver gets the following chips: (+1 -1 +3 -1 +1 +3 -1 -1). Assuming the chip sequences defined in Figure 1, which stations transmitted, and which bits (i.e. bit 0 or bit 1) did each station send? A: (-1-1 -1 +1 +1 -1 +1 +1) B: (-1-1 +1 -1 +1 +1 +1 -1) C: (-1 +1 -1 +1 +1 +1 -1 -1) D: (-1 +1 -1 -1 -1 -1 +1 -1) Fig 1. Bipolar chip...
Q1. A DSB-SC signal is transmitted over a noisy channel with power spectral density of noise...
Q1. A DSB-SC signal is transmitted over a noisy channel with power spectral density of noise given as, 0, otherwise with B-200 kHz and N 10W Hz. The message bandwidth is 10 kHz and its average power is 10 W. Assume A,-1, 100kHz, and the channel attenuates signal power by a factor of 1000 (-30 dB). Assume that a suitable band-pass filter is used at the receiver to limit out-of-band noise. (a) Determine the average signal power at the receiver...
2 Imagine you are designing a portable hand-held device that uses wireless ommunications You have a license to operate the wireless modems over a 500 kHz portion of the radio spectrum. The engin...
2 Imagine you are designing a portable hand-held device that uses wireless ommunications You have a license to operate the wireless modems over a 500 kHz portion of the radio spectrum. The engineers report that the average signal to noise ratio on this channel is 127:1. Equations below What is the maximum possible data transmission rate that can be achieved? a. What signal to noise ratio (indicate units on your answer) is required to double the data rate? b. per...
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Assignment 2. Multiple choice assignment. Check the right answer. 5 points each answer 1. The USA...
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1. (ch.7) A PCM/TDM system multiplexes 24 voice band channels. Each sample is encoded into 7...
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Help!!! A information wave m(t) is transmitted using a 4-bit binary PCM system. A uniform quantizer...
Help!!!
A information wave m(t) is transmitted using a 4-bit binary PCM system. A uniform quantizer is used to convert the sampled signal into a PCM bit stream. Assume a sampling rate of 2 times the Nyquist rate m(t) .5 0.5 2.5 Time (s) Figure 1: Intelligence signal m(). Determine 1. Determine the quantized sample value and its respective PCM sequence for the following samples: 2Ts, 3Ts and 4Ts 2. What bandwidth would be required to transmit this PCM signal?...
1. (1.5 points) A CDMA receiver gets the following chips: (+1 -1 +3 -1 +1 +3 -1 -1). Assuming the chip sequences defined in Figure 1, which stations transmitted, and which bits (i.e. bit 0 or bit 1) did each station send? A: (-1-1 -1 +1 +1 -1 +1 +1) B: (-1-1 +1 -1 +1 +1 +1 -1) C: (-1 +1 -1 +1 +1 +1 -1 -1) D: (-1 +1 -1 -1 -1 -1 +1 -1) Fig 1. Bipolar chip...
Q1. A DSB-SC signal is transmitted over a noisy channel with power spectral density of noise given as, 0, otherwise with B-200 kHz and N 10W Hz. The message bandwidth is 10 kHz and its average power is 10 W. Assume A,-1, 100kHz, and the channel attenuates signal power by a factor of 1000 (-30 dB). Assume that a suitable band-pass filter is used at the receiver to limit out-of-band noise. (a) Determine the average signal power at the receiver...
2 Imagine you are designing a portable hand-held device that uses wireless ommunications You have a license to operate the wireless modems over a 500 kHz portion of the radio spectrum. The engineers report that the average signal to noise ratio on this channel is 127:1. Equations below What is the maximum possible data transmission rate that can be achieved? a. What signal to noise ratio (indicate units on your answer) is required to double the data rate? b. per...
Q2 Fig.2 is a simplified diagram of a WCDMA system downlink signalling 20 construction, in which different channelization code CensF are used to PAPER CODE: EEE326/17-18/S2/ exam Page 2 of 6 separate different physical channels in downlink whilst the scrambling code Sa is used to differentiate the BSs. Each physical channel is assigned to different user with a gain factor Gi. Assume QPSK modulation is employed for digital transmission and the spectrum is 3.84 MHz. One user has a data...
Assignment 2. Multiple choice assignment. Check the right answer. 5 points each answer 1. The USA FM radio broadcasting utilizes the frequency band A. 0.665 MHz-1.6 MHz B. 80 MHz - 100 MHz C. 88 MHz 108 MHz 2. The pre-emphasis is generally used A. to improve the demodulator performance in the presence of noise in the received signal B. to improve the modulator performance C. to improve the stereophonic effect 3. The intermediate frequency of FM superheterodyne receiver is...
4. If an asynchronous frame is used to send ASCII characters in the form of bytes (8 bits), what is the shortest time it could take to send 1000 characters if each bit in a frame is 1 msec long? 5. Suppose an asynchronous frame holds 8 bits of data, a parity bit, and two stop bits (it could happen). Calculate the efficiency of the communication system. Suppose a synchronous frame has 16 bits of non-data in the front and...
1. (ch.7) A PCM/TDM system multiplexes 24 voice band channels. Each sample is encoded into 7 bits and a frame consists of one sample from each channel. A framing bit is added to each frame. The sampling rate is 9000 samples/sec. What is the line speed in bits per second? 2. (ch.9) An asynchronous protocol uses 1 start bit, 7 data bits, 2 stop bits and 1 even parity bit for each character. a. How many bits are in a...
Help!!!
A information wave m(t) is transmitted using a 4-bit binary PCM system. A uniform quantizer is used to convert the sampled signal into a PCM bit stream. Assume a sampling rate of 2 times the Nyquist rate m(t) .5 0.5 2.5 Time (s) Figure 1: Intelligence signal m(). Determine 1. Determine the quantized sample value and its respective PCM sequence for the following samples: 2Ts, 3Ts and 4Ts 2. What bandwidth would be required to transmit this PCM signal?...
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