TSEK02: Radio Electronics Lecture 2: Modulation (I) Ted Johansson, EKS, ISY
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1 TSEK02: Radio Electronics Lecture 2: Modulation (I) Ted Johansson, EKS, ISY
2 2 Basic Definitions Time and Frequency db conversion Power and dbm Filter Basics
3 3 Filter Filter is a component with frequency selective response
4 An Overview of Modulation Techniques: chapter Introduction Analog Modulation Amplitude Modulation Phase and Frequency Modulation Digital Modulation Bandwidth considerations
5 An Overview of Modulation Techniques: chapter Introduction (3.1) Analog Modulation Amplitude Modulation Phase and Frequency Modulation Digital Modulation Bandwidth considerations
6 6 Need for Modulation Every channel has a cut-off frequency (f cut-off ) Theoretically, signals with f > f cut-off cannot propagate through the channel. There may also be a lower frequency limit. Human voice is limited to 4 khz < f cut-off This problem cannot be solved by amplification!
7 The electromagnetic spectrum 7
8 USA frequency allocation GHz 8
9 What is Modulation? 9 Information signal, f < fc Radio Frequency signal, f > fc Modulation: carry the information signal on the radio frequency carrier
10 10 Modulation Modulation refers to turning information into (electrical) signals which are suitable for transmission Data Modulator Information-bearing electrical signal
11 11 Modulation Types Signal properties are varied according to the information Properties of an RF signal Amplitude Frequency Phase This variation could be continuous (analog modulation) or in discrete steps (digital modulation)
12 12 Modulation aspects Detectability Bandwidth efficiency Power efficiency Complexity, required bandwidth, sensitivity to noise, sensitivity to nonlinearity,...
13 An Overview of Modulation Techniques: chapter Introduction Analog Modulation Amplitude Modulation (3.2.1) Phase and Frequency Modulation Digital Modulation Bandwidth considerations
14 14 Amplitude Modulation (AM) Multiplication of a baseband signal with a single-tone sinusoidal (called the carrier) Amplitude of the signal is varied according to the modulating signal A(t) Modulating Signal X AM (t)=a(t) cos ω c t
15 15 Amplitude Modulation in frequency domain Contains one frequency Zero will be shifted to the carrier frequency Multiplication in the time-domain corresponds to convolution in frequency-domain A(f)
16 From TSEK03 RFIC 16
17 Amplitude Modulation/Frequency Conversion 17 this part is called Lower SideBand (LSB) this part is called Upper SideBand (USB) Zero will be shifted to the carrier frequency This frequency is more than the carrier frequency
18 18 Amplitude Modulation/Frequency Conversion A signal with the carrier frequency might also exist at the output. Possible causes are: 1. DC component at the input 2. Leakage
19 19 AM Variants Variants of AM are Double-sideband Double-sideband suppressed-carrier (DSB-SC) Single-Sideband (SSB) Main problem to be solved: higher bandwidth, more power is needed (wasted)
20 20 Amplitude Modulation (AM) Multiplication of a baseband signal with a single-tone sinusoidal (called the carrier) Amplitude of the signal is varied according to the modulating signal A(t) Modulating Signal X AM (t)=a(t) cos ω c t
21 21 Amplitude Detection (demodulation)
22 Ted's history corner 22 AM Radios Frequency (typ): khz
23 Ted's history corner 23
24 Ted's history corner 24
25 Ted's history corner 25 Those were the days.
26 26
27 An Overview of Modulation Techniques: chapter Introduction Analog Modulation Amplitude Modulation Phase and Frequency Modulation (3.2.2) Digital Modulation Bandwidth considerations
28 28 Phase and Frequency Modulation In the most general form an RF signal can be represented as PM S(t) = A cos φ(t) φ(t) is called total phase Instantaneous frequency is defined as dφ(t)/dt In this respect, phase and frequency modulation are essentially the same, except for an integration FM
29 29 Phase and Frequency Modulation Typical FM/PM waveform Note: Amplitude is constant (immune to noise) Data is contained in zero crossing intervals The modulated signal has (theoretically) infinite bandwidth
30 Ted's history corner 30 Armstrong invented the frequency modulator in 1933
31 Ted's history corner 31 FM Radio Frequency (typ): MHz
32 An Overview of Modulation Techniques: chapter Introduction Analog Modulation Amplitude Modulation Phase and Frequency Modulation Digital Modulation (3.2) Bandwidth considerations
33 33 Digital Modulation Analog Amplitude Modulation (AM) Digital Amplitude Shift Keying (ASK) Digital Modulation is more immune to noise => can work with a smaller SNR
34 Binary Digital Modulation 34 Binary Amplitude Shift Keying (ASK) Binary Phase Shift Keying (PSK) Binary Frequency Shift Keying (FSK)
35 Binary Digital Modulation 35 ASK PSK
36 Ted's history corner 36 Keying!
37 An Overview of Modulation Techniques: chapter Introduction Analog Modulation Amplitude Modulation Phase and Frequency Modulation Digital Modulation Bandwidth considerations (3.3.1)
38 38 Bandwidth Linear time-invariant systems can "distort" a signal if they do not provide sufficient bandwidth Each pulse extends in time and spills to the time slot of other pulses. This is called Inter Symbol Interference (ISI).
39 39 Bandwidth What is the bandwidth of a random pulse stream (Ex. 3.5)? It extends as a sinc 2 function The main lobe stops at R b = 1/T b (T b is the bitrate)
40 Bandwidth 40 What is the bandwidth of a Binary PSK (BPSK) signal? BPSK can be expresses as multiplication of a pulse stream and a sinusoidal AM modulation of the pulse stream! Regulations do not allow us to transmit a signal with unlimited bandwidth!
41 Inter-Symbol-Interference (ISI) 41 We need to limit the bandwidth of the baseband signal What happens if we just limit the bandwidth by filtering? Each pulse extends in time and spills to the time slot of other pulses. This is called Inter Symbol Interference (ISI). ISI results in distortion and error in detection
42 42 Pulse Shaping Instead of just filtering the signal, we can shape the pulses to occupy less bandwidth Smoother pulses take less bandwidth These parts should still be filtered, but the time domain signal will not be severely affected Smooth transition
43 43 Pulse Shaping Nyquist Pulse Harry Nyquist noticed that pulses may extend beyond the symbol period but in order to avoid ISI, their value should be zero in the middle of other pulses. So he proposed a smart pulse shape Notice that this is in time domain By using this pulse, no ISI will be introduced
44 44 Optimum Bandwidth Nyquist pulse not only removes ISI but also results in the minimum bandwidth for the modulated signal With Nyquist pulse, the modulated RF signal occupies R b =1/T b Hz The absolute theoretical minimum bandwidth required to transmit R b pulses per second!
45 Raised Cosine Pulse 45 In practice, generating Nyquist pulses are very difficult so other similar pulses are used, such as the Raised Cosine 0<α<1 is the roll-off factor, typical values:
46 46 ISI Nyquist pulse Consecutive raised-cosine impulses, demonstrating zero-isi property
47 Ted's history corner 47 Ted's history corner
48
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