Title :
Iterative Channel Estimation for Space-Time Coded MC-CDMA
Author :
Sand, Stephan ; Raulefs, Ronald ; Dammann, Armin
Author_Institution :
German Aerosp. Center Oberpfaffenhofen, Wessling
Abstract :
This paper investigates a downlink multiple-input multiple-output (MIMO) multi-carrier code division multiple access (MC-CDMA) system with iterative channel estimation (ICE) in the receiver. In MC-CDMA, each user´s data symbols are spread with a Walsh-Hadamard code. Due to the superposition of different users´ spread data signals, zero-valued subcarriers can occur, which cannot be used to compute least-squares (LS) estimates in ICE. For multiple transmit antennas, the data signals coincide non-orthogonal at each receive antenna. Hence, we propose two MIMO channel estimation methods to overcome these problems and avoid noise enhancement in ICE.
Keywords :
Hadamard codes; MIMO communication; channel coding; channel estimation; code division multiple access; iterative methods; space-time codes; MIMO channel estimation; Walsh-Hadamard code; downlink multiple-input multiple-output system; iterative channel estimation; least-squares estimates; multi-carrier code division multiple access system; multiple transmit antennas; noise enhancement; receive antenna; space-time coded MC-CDMA; users data symbols; zero-valued subcarriers; Channel estimation; Channel state information; Downlink; Ice; MIMO; Multicarrier code division multiple access; Multilevel systems; OFDM modulation; Receiving antennas; Transmitting antennas;
Conference_Titel :
Vehicular Technology Conference, 2006. VTC-2006 Fall. 2006 IEEE 64th
Conference_Location :
Montreal, Que.
Print_ISBN :
1-4244-0062-7
Electronic_ISBN :
1-4244-0063-5
DOI :
10.1109/VTCF.2006.318
