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1 (b), OFDM signal, s(t), can be extended into ~ ( t by ) 22 BASIC CONCEPTS Chapter 2 With the cyclic extension, the actual OFDM symbol duration is increased from T, to T = T,+Tg. In the following discussion, the cyclic suffix extension in Fig. 1 (b) is assumed. However, the results can be also applied to the other types of cyclic extension. 1. OFDM signal with different cyclic extensions. 1. 1) is a summation of truncated complex exponential functions with different frequencies, the power density spectrum of s(t) consists of I sin(f)/ f 12-shaped spectra, as sketched in Fig.

1 (b) is assumed. However, the results can be also applied to the other types of cyclic extension. 1. OFDM signal with different cyclic extensions. 1. 1) is a summation of truncated complex exponential functions with different frequencies, the power density spectrum of s(t) consists of I sin(f)/ f 12-shaped spectra, as sketched in Fig. 2. 2. Power spectrum of OFDM Signal. Fig. 2 shows that, for an OFDM signal consisting of N subchannels, the signal bandwidth is about ( N l ) Af . , the total transmission rate of OFDM signal is $ symbol/sec.

However, the exact expressions are complicated and do not easily provide much insight. Furthermore, in many instances, the exact time-domain correlation or power spectrum is not available. Here, we introduce several bounds on the ICI power, which are derived in [37]. These bounds are less complicated and the insight is more readily obtained. 10) PIC1 z ( 2 n f d ~ s ) 2 - -(2afdT~)*, 360 > and a1 PICI 5 E ( 2 ~ f d ~ . 1 for the three models introduced before. It should, be indicated that without knowing the Doppler spectrum, a1 and a 2 can be also evaluated using other approaches.