No pilot subcarriers are inserted since the channel is assumed to be perfectly known at the receiver.

INSTRUCTIONS TO CANDIDATES

ANSWER ALL QUESTIONS

The simulation parameters are listed in Table 1. Each OFDM symbol consist of 64 or 256 subcarriers; all subcarriers are utilized for data transmission, and the data modulation used is BPSK.

No pilot subcarriers are inserted since the channel is assumed to be perfectly known at the receiver.

The multipath channel is assumed to be static during an OFDM symbol and consists of three taps. Without loss of generality, we assume that the channel taps are normalized such that

-1 2

Στο σκο

= 1.

A cyclic prefix of sufficient length is used in order to eliminate ISI.

O

Table 1 Simulation parameters

Parameter

Number of subcarriers (N)

Value

64, 256

Number of OFDM symbols simulated

4 x 106

BPSK

Modulation scheme

OFDM symbol duration

Guard type and length

Channel delay Channel gain

20 μs

Cyclic prefix (16-64 subcarriers)

[0 1500 4000] μs

[0-4-8] dB

 

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