TU IOE · EX 715

Wireless Communication

Chapters
8
Questions
155

Past questions by syllabus

1.

Introduction

1.1

Evolution of wireless (mobile) communications, worldwide market, examples

13 questions
2.

Cellular mobile communication concept

2.1

Frequency re-use and channel assignment strategies

4 questions
  3. 2071 BhadraChapter 2: Cellular mobile communication concept2.1 Frequency re-use and channel assignment strategies

    Prove that for a hexagonal geometry the co-channel reuse ratio is given by Q = sqrt(3N); Where N = i^2 + j^2 + ij. A cellular service provider decides to use a digital TDMA scheme which can tolerate a Signal-to-Interference Ratio of 15 dB in the worst case. Find the optimal value of N for (a) Omni directional antennas, (b) 120 Degree Sectoring, (c) 60 Degree Sectoring [Use path loss exponent of 4 and consider trunking efficiency]

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2.2

Handoff strategies, types, priorities, practical considerations

8 questions
2.4

Grade of service, definition, standards

4 questions
2.5

Coverage and capacity enhancement in cellular network, cell splitting, sectoring, repeaters, microcells

5 questions
3.

Radio wave propagation in mobile network environment

3.1

Review Free space propagation model, radiated power and electric field

4 questions
  1. 2080 BhadraChapter 3: Radio wave propagation in mobile network environment3.1 Review Free space propagation model, radiated power and electric field

    A wireless communication transmitter has an output power of 165 watts at a carrier frequency of 325 MHz. It is connected to an antenna with a gain of 12 dBi. The receiving antenna is 15 km away and has a gain of 6 dBi. Calculate the power delivered to the receiver, considering free-space propagation. (Assume that there are no other losses or mismatches in the system.)

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  2. 2081 BaishakhChapter 3: Radio wave propagation in mobile network environment3.1 Review Free space propagation model, radiated power and electric field

    If a transmitter produces 50 watts of power, express the transmit power in units of (i) dBm, and (ii) dBW. If 50 watts is applied to a unity gain antenna with a 900 MHz carrier frequency, find the received power in dBm at a free space distance of 100 m from the antenna. What is Pr (10 km)? Assume unity gain for the receiver antenna.

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  3. 2080 BaishakhChapter 3: Radio wave propagation in mobile network environment3.1 Review Free space propagation model, radiated power and electric field

    Assume free space propagation, a receiver is located 10 km away from a 50 w transmitter. The carrier frequency is 900 MHz. antenna gain at transmitter and receiver are 1 and 2 respectively, find: i) The power received at the receiver ii) The magnitude of E-field at the receiver antenna iii) The power flux density iv) The rms voltage applied to the receiver input. The receiver antenna has a purely real impedance of 50 Ohm and is matched to the receiver.

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3.2

Review Propagation mechanisms (large-scale path loss) - Reflection, ground reflection, diffraction and scattering

8 questions
3.4

Outdoor propagation models (Longley-Rice, Okumura, Hata, Walfisch and Bertoni, microcell)

11 questions
3.6

Small scale fading and multipath (factors, Doppler shift), Impulse response model of multipath channel, multipath measurements, parameters of mobile multipath channel (time dispersion, coherence bandwidth, Doppler spread and coherence time)

7 questions
  1. 2081 BaishakhChapter 3: Radio wave propagation in mobile network environment3.6 Small scale fading and multipath (factors, Doppler shift), Impulse response model of multipath channel, multipath measurements, parameters of mobile multipath channel (time dispersion, coherence bandwidth, Doppler spread and coherence time)
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  2. 2080 BaishakhChapter 3: Radio wave propagation in mobile network environment3.6 Small scale fading and multipath (factors, Doppler shift), Impulse response model of multipath channel, multipath measurements, parameters of mobile multipath channel (time dispersion, coherence bandwidth, Doppler spread and coherence time)
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  3. 2071 MaghChapter 3: Radio wave propagation in mobile network environment3.6 Small scale fading and multipath (factors, Doppler shift), Impulse response model of multipath channel, multipath measurements, parameters of mobile multipath channel (time dispersion, coherence bandwidth, Doppler spread and coherence time)
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  4. 2075 BhadraChapter 3: Radio wave propagation in mobile network environment3.6 Small scale fading and multipath (factors, Doppler shift), Impulse response model of multipath channel, multipath measurements, parameters of mobile multipath channel (time dispersion, coherence bandwidth, Doppler spread and coherence time)
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  5. 2071 BhadraChapter 3: Radio wave propagation in mobile network environment3.6 Small scale fading and multipath (factors, Doppler shift), Impulse response model of multipath channel, multipath measurements, parameters of mobile multipath channel (time dispersion, coherence bandwidth, Doppler spread and coherence time)
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  6. 2071 MaghChapter 3: Radio wave propagation in mobile network environment3.6 Small scale fading and multipath (factors, Doppler shift), Impulse response model of multipath channel, multipath measurements, parameters of mobile multipath channel (time dispersion, coherence bandwidth, Doppler spread and coherence time)
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  7. 2074 MaghChapter 3: Radio wave propagation in mobile network environment3.6 Small scale fading and multipath (factors, Doppler shift), Impulse response model of multipath channel, multipath measurements, parameters of mobile multipath channel (time dispersion, coherence bandwidth, Doppler spread and coherence time)
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3.7

Types of small-scale fading (flat, frequency selective, fast, slow), Rayleigh and Ricean fading distribution

2 questions
4.

Modulation-Demodulation methods in mobile communications

4.2

Review of line coding, digital linear (BPSK, DPSK, QPSKs) and constant envelop (BFSK, MSK, GMSK) modulation and demodulation techniques

7 questions
  2. 2080 BaishakhChapter 4: Modulation-Demodulation methods in mobile communications4.2 Review of line coding, digital linear (BPSK, DPSK, QPSKs) and constant envelop (BFSK, MSK, GMSK) modulation and demodulation techniques

    How can Minimum Shift Keying (MSK) be defined as a special type of continuous phase FSK and Offset Quadrature Phase Shift Keying (OQPSK)? Compare OQPSK, MSK and GMSK in terms of their bandwidth efficiency and power efficiency. Which of them are suitable for modulation in GSM and Why?

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4.3

M-ary (MPSK, MFSK, QAM and OFDM) modulation and demodulation techniques

5 questions
5.

Equalization and diversity techniques

5.1

Basics of equalization. Equalization in communications receivers, linear equalizers

2 questions
5.2

Non-linear equalization, decision feedback and maximum likelihood sequence estimation equalizations

2 questions
5.3

Adaptive equalization algorithms, zero forcing, least mean square, recursive least squares algorithms, fractionally spaced equalizers

1 question
5.4

Diversity methods, advantages of diversity, basic definitions

3 questions
5.5

Space diversity, reception methods (selection, feedback, maximum ratio and equal gain diversity)

2 questions
5.7

RAKE receivers and interleaving

6 questions
6.

Speech and channel coding fundamentals

6.1

Characteristics of speech signals, frequency domain coding of speech (sub-band and adaptive transform coding)

7 questions
6.2

Vocoders (channel, formant, cepstrum and voice-excited ), Linear predictive coders (multipulse, code and residual excited LPCs), Codec for GSM mobile standard

7 questions
7.

Multiple Access in Wireless communications

7.1

Frequency Division Multiple Access (FDMA), principles and applications

4 questions
7.2

Time Division Multiple Access (TDMA), principles and applications

1 question
7.3

Spread Spectrum Multiple Access, Frequency Hopped Multiple Access, Code Division Multiple Access, hybrid spread spectrum multiple access techniques

12 questions
7.4

Space Division Multiple Access

2 questions
8.

Wireless systems and standards

8.2

Global system for Mobile (GSM): Services and features, system architecture, radio sub-system, channel types (traffic and control), frame structure, signal processing, example of a GSM call

15 questions
  2. 2081 BaishakhChapter 8: Wireless systems and standards8.2 Global system for Mobile (GSM): Services and features, system architecture, radio sub-system, channel types (traffic and control), frame structure, signal processing, example of a GSM call

    Explain GSM signal processing with necessary figures.

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8.3

CDMA standards: Frequency and channel specifications, Forward and Reverse CDMA channels

2 questions