A 480×640 digital image is transmitted along a MIMO wireless communication system with 1.2 Mb/s bit rate for each stream. The stream is the sub-data transmitted or received through one antenna. Each pixel of this image is digitally represented by 24 bits/pixel. By neglecting the length of wireless channel, determine the required time in seconds to complete receiving this image at the receiver; considering the following techniques are used separately: i. SISO technique. ii. 2×2 MIMO technique. iii. 3×3 MIMO technique. iv. 2×4 MIMO technique.
Question
A 480×640 digital image is transmitted along a MIMO wireless communication system with 1.2 Mb/s bit rate for each stream. The stream is the sub-data transmitted or received through one antenna. Each pixel of this image is digitally represented by 24 bits/pixel. By neglecting the length of wireless channel, determine the required time in seconds to complete receiving this image at the receiver; considering the following techniques are used separately: i. SISO technique.
ii. 2×2 MIMO technique.
iii. 3×3 MIMO technique.
iv. 2×4 MIMO technique.
Solution
Para resolver este problema, sigamos los siguientes pasos:
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Calcular el tamaño total de la imagen en bits:
- La imagen tiene una resolución de 480×640 píxeles.
- Cada píxel está representado por 24 bits.
- Tamaño total de la imagen en bits = 480 × 640 × 24.
-
Calcular el tiempo requerido para transmitir la imagen usando diferentes técnicas:
- La tasa de bits es de 1.2 Mb/s por stream.
- Convertimos la tasa de bits a bits por segundo: 1.2 Mb/s = 1.2 × 10^6 bits/s.
i. SISO (Single Input Single Output) technique:
- En SISO, solo hay un stream.
- Tiempo requerido = Tamaño total de la imagen en bits / Tasa de bits por stream.
ii. 2×2 MIMO technique:
- En 2×2 MIMO, hay 2 streams.
- Tasa de bits total = 2 × 1.2 × 10^6 bits/s.
- Tiempo requerido = Tamaño total de la imagen en bits / Tasa de bits total.
iii. 3×3 MIMO technique:
- En 3×3 MIMO, hay 3 streams.
- Tasa de bits total = 3 × 1.2 × 10^6 bits/s.
- Tiempo requerido = Tamaño total de la imagen en bits / Tasa de bits total.
iv. 2×4 MIMO technique:
- En 2×4 MIMO, hay 2 streams (el número de streams es el menor de los dos números).
- Tasa de bits total = 2 × 1.2 × 10^6 bits/s.
- Tiempo requerido = Tamaño total de la imagen en bits / Tasa de bits total.
Ahora, realicemos los cálculos:
-
Tamaño total de la imagen en bits:
-
Tasa de bits por stream:
i. SISO technique:
ii. 2×2 MIMO technique:
iii. 3×3 MIMO technique:
iv. 2×4 MIMO technique:
Por lo tanto, los tiempos requeridos para cada técnica son:
- SISO: 6.144 segundos.
- 2×2 MIMO: 3.072 segundos.
- 3×3 MIMO: 2.048 segundos.
- 2×4 MIMO: 3.072 segundos.
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