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Testkiller: Cisco Support Exam 640-506

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The time (in terms of OFDM symbols) and frequency (in terms of subcarrier spacing) intervals are largely determined by the characteristics of the channels, and in particular its maximum Doppler frequency and the multipath delay spread. 2. 4: An example OFDM pilot structure Let us assume that 1. The maximum frequency shift is FD Hz, half of the Doppler bandwidth BD; 2. The maximum delay spread T, = LT, seconds; 3. Discrete pilot symbols are placed N f subcarriers apart in frequency and Nt OFDM symbols apart in time.

In the following, we first establish a data model for frequency dependent I/Q imbalance and frequency offset. 3. 8: An receiver with I/Q imbalance structure that can compensate both imperfections. To determine the compensation parameters, we introduce a pilot-based scheme for both frequency offset and I/Q imbalance estimation. 7 shows the general architecture of a direct-conversion receiver. 8. We categorize the I/Q imbalance into a frequency independent part and a frequency dependent part. First, the imbalance caused by the LO can be characterized by an amplitude mismatch a and a phase error q5 [19].

The time (in terms of OFDM symbols) and frequency (in terms of subcarrier spacing) intervals are largely determined by the characteristics of the channels, and in particular its maximum Doppler frequency and the multipath delay spread. 2. 4: An example OFDM pilot structure Let us assume that 1. The maximum frequency shift is FD Hz, half of the Doppler bandwidth BD; 2. The maximum delay spread T, = LT, seconds; 3. Discrete pilot symbols are placed N f subcarriers apart in frequency and Nt OFDM symbols apart in time.

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