TM 111 The Open University Computing and Information Technology Worksheet
Description
Having Trouble Meeting Your Deadline?
Get your assignment on TM 111 The Open University Computing and Information Technology Worksheet completed on time. avoid delay and – ORDER NOW
- a.
- i. As explained in Sections 3.2.2 and 4.4.2 of Block 3, urban environments are more obstructive to radio waves than rural environments, leading to reduced base station (BS) range. This can however be of benefit in urban areas where there is high demand for cellular communication services. Briefly explain, in no more than 100 words, why reduced BS range can be advantageous in this context.(5 marks)
- ii.Home automation is an example application of an Internet of Things (IoT) network, in which various mains and battery-operated sensors and devices are controlled from either inside a house or from a remote location. While Wi-Fi is common in domestic settings, it has limitations in effectively supporting IoT devices in the home, which has led to alternative short-range, low-power, low-data networks, like ZigBee, being proposed for home automation purposes.Based on what you have learnt in Block 3, write a summary, on the requirements for a home automation IoT network (see Section 4.5, P214), discussing whether Wi-Fi is the best network option, by considering radio coverage, power consumption, cost and convenience. You should also outline how, in using ZigBee as a home automation network, some of the Wi-Fi issues you have identified, are addressed.The maximum word limit is 250 words.(10 marks)
- b.A mobile base station (BS) in an urban environment has a power measurement of 15 µW at 175 m. If the propagation follows an inverse cube-power law (Section 3.2.2), what is a reasonable power value, in µW, to assume at a distance 0.7 km from the BS? Give your answer in scientific notation to 2 decimal places.(5 marks)
- c.An analogue signal is sampled every 160 µs to convert it into a digital representation. What is the corresponding sampling rate expressed in kHz?According to the Sampling Theorem (Section 3.3.1), for this sampling rate, what will approximately be the highest frequency present in the signal, in kHz, assuming the lowest frequency is very close to zero? If each sample is quantised into 128 levels, what will be the resulting bitrate in bps?Give your answer in scientific notation to 2 decimal places.Hint: you will first need to determine the number of bits per sample that produces 128 quantisation levels (see Sections 2.4 (Block 1) and 3.3.2 (Block 3)).(5 marks)
- d.The 7-bit ASCII code for the character T is: 1010100An even parity check bit is now appended to the end of the code so 8 bits are transmitted. What will be the transmitted code for the ASCII character T? If even parity check bits are used, which of the following 8-bit received ASCII codes are invalid?
- i.10001110
- ii.11011111
- iii.01110110
- iv.11011011
(5 marks)
