BER in OFDM system
2016-08-23
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Conceptually, OFDM is a special finite difference method. Another constraint is that all carrier signals are orthogonal to each other. In OFDM, subcarrier frequency selection means that it is not necessary to eliminate the crosstalk between subcarriers and protect the frequency band between subcarriers. This greatly simplifies the design of transmitter and receiver; unlike conventional FDM, separate filters for each subchannel are not required. Orthogonality requires that the subcarrier spacing is scriptstyledelta f = {K} {t}_ U} For the symbol duration (receiver side window size), K is a positive integer, usually equal to 1. Therefore, the common bandwidth with n subcarriers will be B ≈ n · Δ f (Hz). Orthogonality also allows high spectrum utilization, which is the total symbol rate of the Nyquist rate of the nearby equivalent baseband signal (i.e. nearly half of the Nyquist rate of the two-sided band physical pass band signal). Almost the entire available frequency band can be utilized. Generally, the technology of OFDM has a near 'white' spectrum, which gives it good EMI performance, which is related to other common channel users.
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