TY - JOUR
T1 - An iterative expectation-maximization algorithm based joint estimation approach for CDMA/OFDM composite radios
AU - Wang, Tianqi
AU - Li, Cheng
AU - Chen, Hsiao Hwa
N1 - Funding Information:
Manuscript submitted February 26, 2007; revised May 22, 2007; accepted July 30, 2007. The associate editor coordinating the review of this paper and approving it for publication was Q. Zhang. This work was supported in parts by the Natural Science and Engineering Research Council (NSERC) of Canada (research grant RGPIN 293264-07), and the National Science Council of Taiwan (research grants NSC96-2221-E-006-345 and NSC96-2221-E-006-346). Part of this work has been presented at 2007 IEEE Communications Conference (ICC’07).
PY - 2008/8
Y1 - 2008/8
N2 - In this paper, an innovative frequency domain joint estimation algorithm for synchronization parameter and channel impulse response (CIR) in direct sequence code division multiple access (DS-CDMA) systems is proposed. The algorithm is based on the expectation-maximization (EM) method. It can provide accurate estimation of channel state information and synchronization parameter for a DS-CDMA receiver even with a simple equalization module (e.g., an one-tap multiplier based frequency domain equalizer (FDE)), and a radio receiver with this approach performs better than a costly multi-tap multiplier based equalizer, such as the time domain equalizer (TDE). A generic receiver architecture based on the frequency domain equalization for a composite radio, which works in both CDMA and orthogonal frequency division multiplexing (OFDM) modes, is also proposed. The Cramer-Rao Lower Bound (CRLB) of the proposed estimator and its optimization scheme are derived. This architecture can be implemented with an iterative approach, and the results demonstrate that this adaptive receiver performs very well with a relatively low cost.
AB - In this paper, an innovative frequency domain joint estimation algorithm for synchronization parameter and channel impulse response (CIR) in direct sequence code division multiple access (DS-CDMA) systems is proposed. The algorithm is based on the expectation-maximization (EM) method. It can provide accurate estimation of channel state information and synchronization parameter for a DS-CDMA receiver even with a simple equalization module (e.g., an one-tap multiplier based frequency domain equalizer (FDE)), and a radio receiver with this approach performs better than a costly multi-tap multiplier based equalizer, such as the time domain equalizer (TDE). A generic receiver architecture based on the frequency domain equalization for a composite radio, which works in both CDMA and orthogonal frequency division multiplexing (OFDM) modes, is also proposed. The Cramer-Rao Lower Bound (CRLB) of the proposed estimator and its optimization scheme are derived. This architecture can be implemented with an iterative approach, and the results demonstrate that this adaptive receiver performs very well with a relatively low cost.
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U2 - 10.1109/TWC.2008.070232
DO - 10.1109/TWC.2008.070232
M3 - Article
AN - SCOPUS:50049099262
VL - 7
SP - 3196
EP - 3205
JO - IEEE Transactions on Wireless Communications
JF - IEEE Transactions on Wireless Communications
SN - 1536-1276
IS - 8
M1 - 4600231
ER -