Each subcarrier carry a unique symbol.

Is the following statement correct ?

"If carrier is single, we are able send only one vector of symbols on the channel by using the carrier.

In the case of OFDM systems, we are going to pass multiple carriers through a single channel and each carrier carries vector of array. "

Is the above statement correct. because I have understand the OFDM as above?

Please clarify my doubt.

Thanking you

In this statement, I understand that the vectors correspond to the time direction: in a single carrier system, a signal vector X = [x1,x2,...,xn] contains the samples corresponding to time slots 1, 2 , ... n.

In a multicarrier context as OFDM, the frequency and the time are splitted. Thus you can consider the signal as an array

X =

[x11, x12, ...x0n;

x21,x22,...,x2n;

........

xM1,xM2,...xMn], 

where the M rows correspond to the M carriers along the frequency axis, and the n rcolumn correspond to n succesive OFDM symbols. It reflect the statement "each carrier carries vector of array".

I hope my answer is clear enough.

Thanking you Vincent,

your answer is correct . Whatever you told is correct. 

Dear Dileep,

welcome,

The colleagues gave correct answer but i want to stress some points:

In OFDM system there are;

binary symbols they are the input bits

A number of them is grouped together to make one QUAM symbol

Every subcarrier is modulated by one QUAM symbol

The Quam symbol contains n-bits =log 2M with Mis the Quam order.

All subcarriers form one OFDM symbol that modulates the rf carriers.

Best wishes