LMSE-Based Parameter Acquisition for Multicarrier CDMA Systems

被引:3
作者
Tseng, Shun-Te [1 ]
Lehnert, James S. [2 ]
机构
[1] Realtek Semicond Corp, Hsinchu 300, Taiwan
[2] Purdue Univ, Sch Elect & Comp Engn, W Lafayette, IN 47907 USA
关键词
Acquisition; MC-CDMA; multicarrier; MMSE; LMSE; MMSE INTERFERENCE SUPPRESSION; MULTIPLE-ACCESS SYSTEMS; CODE ACQUISITION; FREQUENCY; SYNCHRONIZATION; SIGNALS; OFDM; DEMODULATION;
D O I
10.1109/TCOMM.2009.10.070265
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
An acquisition scheme, based on the least mean-squared error (LMSE), for the symbol timing, carrier phases, and multipath gains for multicarrier code-division multiple-access (MC-CDMA) systems is proposed. A new coefficient called the quasi-mean-squared accuracy coefficient (QMSAC) is introduced. This allows the search for multiple optimal parameters to be split into simpler single-parameter estimates. The symbol timing is acquired with a comparison of the QMSACs followed by a linear interpolation scheme or a search of a minimizing variable. Carrier phases and multipath gain coefficients are then estimated via some algebraic computations based only on the estimated symbol timing and the QMSACs. The spreading sequence of the desired user is the only prior knowledge required for the proposed approach. Simulation results demonstrate the near-far resistance of the approach and show that the error performance of minimum mean-squared error (MMSE) detection with acquired parameters is only a few decibels worse for the considered channel than the performance obtained with perfect knowledge about the channel impulse response.
引用
收藏
页码:3113 / 3122
页数:10
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