durga
Member • Oct 14, 2008
Inter block interference
1.could any one brief me with inter block interference??
Consider the case of OFDM, where a block of bits are sent on a subcarrier..when we talk about multi path fading.. the channel ideally should be acting a filter at t=0, allowing only the data stream at that specific instance.but since no ideal channels, we will be having channels impulses at various instances and due to multi path fading the data bit xi which already passed thorugh the direct path at t=i instancem reoccurs at some other interval of t.say tk.
so at the time instance 'k'., we as well have the bit coming from the direct path which is xk,and the bit coming from a second path x1( first bit comes in after a time delay of xk-1 bits).
thus resulting in our output to be:
yk=h0.xk + hk.xi
can any one explain me if yk,xk,xi are block of bits instead of one single bit as in intersignal interference how is the behaviour??
I got totally lost and confused!!!
2.I would also want to know, the definition of 'tap' when you talk about 'n-tap' channel
Consider the case of OFDM, where a block of bits are sent on a subcarrier..when we talk about multi path fading.. the channel ideally should be acting a filter at t=0, allowing only the data stream at that specific instance.but since no ideal channels, we will be having channels impulses at various instances and due to multi path fading the data bit xi which already passed thorugh the direct path at t=i instancem reoccurs at some other interval of t.say tk.
so at the time instance 'k'., we as well have the bit coming from the direct path which is xk,and the bit coming from a second path x1( first bit comes in after a time delay of xk-1 bits).
thus resulting in our output to be:
yk=h0.xk + hk.xi
can any one explain me if yk,xk,xi are block of bits instead of one single bit as in intersignal interference how is the behaviour??
I got totally lost and confused!!!
2.I would also want to know, the definition of 'tap' when you talk about 'n-tap' channel
