Which modulation schemes are supported by WiMAX?

Explanation: WiMAX supports a variety of modulation schemes such as binary phase shift keying modulation, quadrature phase shift keying modulation, and quadrature amplitude modulation and allows for the scheme to change on a burst-by-burst basis per link, depending on channel conditions.

What is the multiplexing technique used in mobile WiMAX?

The fixed/mobile WiMAX PHY layer uses a technology called orthogonal frequency division multiplexing (OFDM). OFDM techniques have been around for decades. The technology is now commonplace in wireless systems such as Wi-Fi.

Why modulation techniques are used in wireless communication?

As the carrier is modulated, additional frequency components are created. Without these extra frequency components, the received signal would not resemble the original transmitted signal. These side-bands define a definite signal physical spectrum bandwidth.

What are modulation techniques?

Modulation is the process of converting data into electrical signals optimized for transmission. Modulation techniques are roughly divided into four types: Analog modulation, Digital modulation, Pulse modulation , and Spread spectrum method. Digital modulation involves transmission of binary signals (0 and 1).

Which modulation scheme is used by Bluetooth?

Gaussian Frequency Shift Keying
Bluetooth technology uses a special binary frequency shift keying modulation scheme called Gaussian Frequency Shift Keying (GFSK). It’s a binary modulation scheme because each symbol represents only one bit, with a value of either zero or one.

Which of the following frequencies is used in WiMAX for communication?

Currently, mobile WiMAX can be implemented in three spectrum bands (2.3-2.4 GHz, 2.5-2.7 GHz, and 3.4-3.6 GHz) which have mostly common allocations worldwide.

What are the three major multiplexing techniques?

The 3 types of multiplexing techniques include the following.

• Frequency Division Multiplexing (FDM)
• Wavelength Division Multiplexing (WDM)
• Time Division Multiplexing (TDM)

What is an intelligent multiplexing techniques?

Intelligent Multiplexing Rather than being a device used in pairs, it is used as a singular device, a line-sharing device whose purpose is to concentrate large numbers of low-speed lines to be carried over a high-speed line to a further point in the network.

Which modulation technique is best?

Frequency modulation is more effective in terms of noise tolerance and more suited for data transmission than AM. Phase modulation is more complex and costly but is relatively immune to noise and theoretically makes the best use of bandwidth for a given transmission rate.

What is Bluetooth and its types?

From a technical perspective, there are essentially three different types of devices: “Classic” Bluetooth, Blue- tooth dual-mode and Bluetooth single-mode. The first is the “classic” Bluetooth device as mentioned earlier. These are typically those devices that need a maintained and often high-throughput connection.

What is the difference between PWM and pulse width modulation?

4. Pulse Duration Modulation (PDM) or Pulse Width Modulation (PWM): Modulation is a technique in which message signal is transmitted to the receiver with the help of carrier signal. Here in modulation, we combine both carrier signal and message signal. You may get the doubt that what is the need of modulation.

How does pulse position modulation ( PPM ) work?

So we will get the waveform of pulse position modulation from PWM. As you can see in the image, that the starting point of each pulse in PPM waveform is obtained from the trailing edge of the PWM pulse. It means, each pulse in PPM starts where the PWM pulse ends (trailing edge of PWM pulse).

What do you mean by pulse amplitude modulation?

Pulse Amplitude Modulation. Pulse Amplitude Modulation (PAM) is an analog modulating scheme in which the amplitude of the pulse carrier varies proportional to the instantaneous amplitude of the message signal.

When was pulse amplitude modulation ( PAM ) introduced?

PAM: Pulse Amplitude Modulation for Digital Modulation. 1. Pulse Code Modulation (PCM): Pulse Code Modulation is first introduced by Alec Reeves in the year 1937. In the pulse code modulation, Analog Signal is reconstructed to digital signal for ease of transmission by using the analog signal samples.