Subträgerabstand

Subträgerabstand refers to the spacing between subcarriers in a multicarrier modulation system, such as Orthogonal Frequency Division Multiplexing (OFDM). In these systems, a single data stream is divided into multiple lower-rate data streams, each transmitted on its own subcarrier. The subcarriers are closely spaced to efficiently utilize the available bandwidth.

The subträgerabstand is a crucial parameter that directly impacts the system's performance and efficiency. A smaller subträgerabstand allows for more subcarriers within a given bandwidth, leading to higher spectral efficiency. However, a smaller spacing also increases the susceptibility to intercarrier interference (ICI), which occurs when subcarriers are not perfectly orthogonal due to factors like frequency offsets or phase noise.

Conversely, a larger subträgerabstand reduces ICI by providing greater separation between subcarriers, making the system more robust against such impairments. However, this comes at the cost of reduced spectral efficiency, as fewer subcarriers can be accommodated in the same bandwidth.

The optimal subträgerabstand is a trade-off between spectral efficiency and robustness against interference. It is typically determined by the specific application requirements, channel conditions, and the capabilities of the transmitter and receiver. For instance, systems operating in mobile environments with potential for Doppler shift may opt for a larger subträgerabstand to mitigate ICI. Fixed wireless systems might be able to use a smaller subträgerabstand to maximize data throughput. This parameter is fundamental in the design and implementation of modern wireless communication systems.