I work in Vector OFDM, but I had an issue in channel estimation in that scheme. For example, I try to use LS channel estimation but I can't get the performance back. However, in conventional OFDM, I can use that estimation straightforward.
First, let me present the difference of VOFDM compared with OFDM, the V-OFDM scheme is presented as below figure:
As you see, the only difference that in V-OFDM divides the data bock into vectors and then process them by vectors.
My question is how to use channel estimation based on pilot insertion in this case ?? any channel estimator such as for example LS. I tried different inserting the pilots in similar way of that in OFDM, but I can't get the performance back !!