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AMC (Adjacent Mapping of Sub-Carriers)

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AMC, or Adjacent Mapping of Sub-Carriers, is a technique used in wireless communication systems to improve spectral efficiency and reduce inter-carrier interference (ICI). It involves mapping adjacent sub-carriers to non-adjacent sub-carriers, which can reduce the effect of ICI and improve the overall performance of the system. In this article, we will provide a detailed explanation of AMC, including its principles, benefits, and applications.

Principles of AMC:

AMC is based on the principle of sub-carrier mapping, which is a process of assigning different sub-carriers to different users or data streams in a wireless communication system. In orthogonal frequency-division multiplexing (OFDM) systems, sub-carriers are used to transmit data in parallel over multiple channels. However, the transmission of data over adjacent sub-carriers can cause ICI, which can reduce the quality of the received signal.

To reduce the effect of ICI, AMC uses a technique called sub-carrier mapping, where adjacent sub-carriers are mapped to non-adjacent sub-carriers. This can be done by using a permutation pattern, where a set of adjacent sub-carriers is moved to a non-adjacent position. For example, if we have a set of sub-carriers (S1, S2, S3, S4, S5, S6), we can use a permutation pattern to map the adjacent sub-carriers S2, S3, and S4 to non-adjacent positions, such as S1, S3, and S6. This can reduce the effect of ICI and improve the spectral efficiency of the system.

Benefits of AMC:

AMC offers several benefits in wireless communication systems, including:

  1. Improved spectral efficiency: By reducing the effect of ICI, AMC can improve the spectral efficiency of the system. This means that more data can be transmitted over the same bandwidth, which can increase the capacity of the system.
  2. Reduced power consumption: By improving the spectral efficiency of the system, AMC can reduce the power consumption of the transmitter and receiver. This can be particularly important in battery-powered devices, such as mobile phones, where power consumption is a critical factor.
  3. Enhanced quality of service: By reducing the effect of ICI, AMC can improve the quality of service (QoS) of the system. This means that users can experience higher data rates, lower latency, and fewer dropped calls.
  4. Improved reliability: By reducing the effect of ICI, AMC can improve the reliability of the system. This means that users can experience fewer errors, interruptions, and signal losses.

Applications of AMC:

AMC is widely used in wireless communication systems, including:

  1. 4G and 5G cellular networks: AMC is used in 4G and 5G cellular networks to improve the spectral efficiency and reduce the effect of ICI. This can improve the performance of the networks, particularly in dense urban areas where multiple users are accessing the network simultaneously.
  2. Digital television: AMC is used in digital television broadcasting to improve the quality of the received signal. This can reduce the effect of multipath interference, which can cause ghosting, signal loss, and other problems.
  3. Wi-Fi and other wireless LANs: AMC is used in Wi-Fi and other wireless LANs to improve the spectral efficiency and reduce the effect of ICI. This can improve the performance of the networks, particularly in high-density environments such as airports, hotels, and convention centers.

Conclusion:

In conclusion, AMC is a technique used in wireless communication systems to improve spectral efficiency and reduce inter-carrier interference. It involves mapping adjacent sub-carriers to non-adjacent sub-carriers, which can reduce the effect of ICI and improve the overall performance of the system. By improving spectral efficiency, AMC can increase the capacity of the system, reduce power consumption, enhance quality of service, and improve reliability. It is widely used in 4G and 5G cellular networks, digital television broadcasting, Wi-Fi and other wireless LANs, and other wireless communication systems.

AMC is just one of many techniques used in wireless communication systems to improve performance. Other techniques include adaptive modulation and coding (AMC), beamforming, channel coding, diversity, and others. These techniques are often used in combination to achieve the best possible performance.