question of ICI in OFDM system

Could anyone tell me if my understanding for the acronym of ICI is right or
not?

There are 2 types of ICI, one is Inter Carrier Interference which is
caused by the frequency offset between transmitter and receiver in OFDM
system, and another is Inter Code Interference which is caused by the Code
Divison Multiplexing in OFDM-CDM system.

On Dec 26, 9:48&#4294967295;pm, "totohaha" <wuxian...@hotmail.com> wrote:
> Could anyone tell me if my understanding for the acronym of ICI is right or
> not?
>
> There are 2 types of ICI, one is Inter Carrier Interference which is
> caused by the frequency offset between transmitter and receiver in OFDM
> system, and another is Inter Code Interference which is caused by the Code
> Divison Multiplexing in OFDM-CDM system.

ICI  - Inter Carrier Interference (Comes in OFDM)
ICI Cancellation Methods are :-
       - Self Cancellation
       - Maximum Likelihood
       - KalmanFiltering

ICI  - Inter-Code Interference related with  MC-CDMA (Comes in System
        based on OFDM - That is, at a bit higher level. MIMO Multicode
MC-
        CDMA is problematic has two interferences, one from inter-
code
        interference between the multicode under the multipath fading
channel,
        and a second from inter-antenna interference caused from an
       independent stream of different antennas. )
Cancellation Methods include the following :-
         -multi-stage parallel interference cancellation (FD-MSPIC).
        -Partially Parallel Interference Cancellation (PPIC)
algorithm
(MC-CDMA - Multi-carrier code division multiple access is a multiple
access technology used in telecommunication systems based on OFDM. - A
variant of the mobile communication standard CDMA2000 )

Karthik Balaguru

so I am concerned about the Inter-Code Cancellation. for example, if the
transmitted x=[-1 -1 -1 +1] and walsh matrix as C=[1 1 1 1;1 -1 1 -1;1 1
-1 -1;1 -1 -1 1], and so the multiplexed signal s=C*x=[-2 -2 -2 2]. then
after channel distortion, the received signal y=[-2.3 -1.5 -0.8 1.2]. how
I should do the Inter-Code Cancellation?