- Teks
- Sejarah
It should be apparent that an ampli
It should be apparent that an amplitude-based signaling scheme, such as amplitude
shift keying (ASK) or quadrature amplitude modulation (QAM), is inherently vul-
nerable to performance degradation in a fading environment. Thus, for fading
channels, the preferred choice for a signaling scheme is a frequency or phase-based
modulation type.
In considering orthogonal FSK modulation for fading channels. the use of
MFSK (with M = 8 or larger) is useful because its error performance is better than
binary signaling. In slow Rayleigh fading channels, binary DPSK and 8-FSK per-
form within 0.1 dB of each other 1191. At first glance, one mieht argue that a higher
order orthogonal alphabet expands the transmission bandwidth, which at some
point may cause the coherence bandwidth of the channel to be exceeded, leading
to frequency-selective fading. However, for MFSK, the transmission bandwidth
that must be available is much larger than the bandwidth of the propagating signal.
For example, consider the case of 8-FSK and a symbol rate of 10,000 symbols/s.
The transmission bandwidth is MR, = 80,000 Hertz. This is the bandwidth that must
be available for the system's use. However, each time that a symbol is transmitted.
only one single-sideband tone (having a spectral occupancy of 10.000 hertz) is sent,
not the whole alphabet. In considering PSK modulation for fading channels, higher
order modulation alphabets perform poorly. MPSK with M = 8 or larger should be
avoided 1191.
shift keying (ASK) or quadrature amplitude modulation (QAM), is inherently vul-
nerable to performance degradation in a fading environment. Thus, for fading
channels, the preferred choice for a signaling scheme is a frequency or phase-based
modulation type.
In considering orthogonal FSK modulation for fading channels. the use of
MFSK (with M = 8 or larger) is useful because its error performance is better than
binary signaling. In slow Rayleigh fading channels, binary DPSK and 8-FSK per-
form within 0.1 dB of each other 1191. At first glance, one mieht argue that a higher
order orthogonal alphabet expands the transmission bandwidth, which at some
point may cause the coherence bandwidth of the channel to be exceeded, leading
to frequency-selective fading. However, for MFSK, the transmission bandwidth
that must be available is much larger than the bandwidth of the propagating signal.
For example, consider the case of 8-FSK and a symbol rate of 10,000 symbols/s.
The transmission bandwidth is MR, = 80,000 Hertz. This is the bandwidth that must
be available for the system's use. However, each time that a symbol is transmitted.
only one single-sideband tone (having a spectral occupancy of 10.000 hertz) is sent,
not the whole alphabet. In considering PSK modulation for fading channels, higher
order modulation alphabets perform poorly. MPSK with M = 8 or larger should be
avoided 1191.
0/5000
Ia seharusnya jelas bahwa berbasis amplitudo sinyal skema, seperti amplitudo pergeseran keying (ASK) atau quadrature amplitudo modulasi (QAM), secara inheren dan Red- nerable untuk penurunan kinerja di lingkungan memudar. Jadi, untuk memudar saluran, pilihan yang lebih disukai untuk skema signaling adalah frekuensi atau berbasis fase Jenis Modulasi. Dalam mempertimbangkan modulasi FSK ortogonal untuk saluran-saluran memudar. penggunaan MFSK (dengan M = 8 atau lebih besar) berguna karena kesalahan kinerja lebih baik daripada Sinyal biner. Dalam lambat Rayleigh saluran memudar, biner DPSK dan 8-FSK per- bentuk dalam 0.1 dB saling 1191. Pada pandangan pertama, satu mieht berpendapat bahwa yang lebih tinggi Urutan Alfabet ortogonal memperluas bandwidth transmisi, yang beberapa titik dapat menyebabkan bandwidth koherensi saluran untuk melebihi, memimpin untuk frekuensi-selektif memudar. Namun, untuk MFSK, bandwidth transmisi yang harus tersedia jauh lebih besar daripada bandwidth maka sinyal. Sebagai contoh, perhatikan kasus 8-FSK dan tingkat simbol simbol/s 10.000. Bandwidth transmisi adalah MR, = 80.000 Hertz. Ini adalah bandwidth yang harus akan tersedia untuk penggunaan sistem. Namun, setiap kali bahwa simbol ditransmisikan. hanya satu nada tunggal-sideband (memiliki hunian spektral 10.000 hertz) dikirim, tidak seluruh alfabet. Dalam mempertimbangkan PSK modulasi untuk memudar saluran, lebih tinggi urutan abjad modulasi berkinerja buruk. MPSK dengan M = 8 atau lebih besar harus dihindari 1191.
Sedang diterjemahkan, harap tunggu..
It should be apparent that an amplitude-based signaling scheme, such as amplitude
shift keying (ASK) or quadrature amplitude modulation (QAM), is inherently vul-
nerable to performance degradation in a fading environment. Thus, for fading
channels, the preferred choice for a signaling scheme is a frequency or phase-based
modulation type.
In considering orthogonal FSK modulation for fading channels. the use of
MFSK (with M = 8 or larger) is useful because its error performance is better than
binary signaling. In slow Rayleigh fading channels, binary DPSK and 8-FSK per-
form within 0.1 dB of each other 1191. At first glance, one mieht argue that a higher
order orthogonal alphabet expands the transmission bandwidth, which at some
point may cause the coherence bandwidth of the channel to be exceeded, leading
to frequency-selective fading. However, for MFSK, the transmission bandwidth
that must be available is much larger than the bandwidth of the propagating signal.
For example, consider the case of 8-FSK and a symbol rate of 10,000 symbols/s.
The transmission bandwidth is MR, = 80,000 Hertz. This is the bandwidth that must
be available for the system's use. However, each time that a symbol is transmitted.
only one single-sideband tone (having a spectral occupancy of 10.000 hertz) is sent,
not the whole alphabet. In considering PSK modulation for fading channels, higher
order modulation alphabets perform poorly. MPSK with M = 8 or larger should be
avoided 1191.
shift keying (ASK) or quadrature amplitude modulation (QAM), is inherently vul-
nerable to performance degradation in a fading environment. Thus, for fading
channels, the preferred choice for a signaling scheme is a frequency or phase-based
modulation type.
In considering orthogonal FSK modulation for fading channels. the use of
MFSK (with M = 8 or larger) is useful because its error performance is better than
binary signaling. In slow Rayleigh fading channels, binary DPSK and 8-FSK per-
form within 0.1 dB of each other 1191. At first glance, one mieht argue that a higher
order orthogonal alphabet expands the transmission bandwidth, which at some
point may cause the coherence bandwidth of the channel to be exceeded, leading
to frequency-selective fading. However, for MFSK, the transmission bandwidth
that must be available is much larger than the bandwidth of the propagating signal.
For example, consider the case of 8-FSK and a symbol rate of 10,000 symbols/s.
The transmission bandwidth is MR, = 80,000 Hertz. This is the bandwidth that must
be available for the system's use. However, each time that a symbol is transmitted.
only one single-sideband tone (having a spectral occupancy of 10.000 hertz) is sent,
not the whole alphabet. In considering PSK modulation for fading channels, higher
order modulation alphabets perform poorly. MPSK with M = 8 or larger should be
avoided 1191.
Sedang diterjemahkan, harap tunggu..
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