S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Computer Science and Engineering (컴퓨터공학부) Journal Papers (저널논문_컴퓨터공학부)
Transmitter-Based Processing for Down-Link DS/CDMA Systems with Multiple Transmit Antennas
- Park, Chang Soon; Lee, Kwang Bok
- Issue Date
- IEEE Trans. Commun., vol. 56, pp. 1047-1055, July 2008
- Direct-sequence code-division multiple-access; diversity; multiple transmit antennas; pre-rake; decorrelation; interference suppression
- Paper approved by R. Kohno, the Editor for Spread Spectrum Theory
and Applications of the IEEE Communications Society. Manuscript received
October 8, 2004; revised October 11, 2005.
This paper was presented
in part at the IEEE International Symposium on Personal, Indoor and Mobile
Radio Communications, Lisbon, Portugal, September 2002.
- In cellular wireless communication systems, there
have been various receiver-based techniques for performance
improvement. However, it may be desirable to use transmitterbased
techniques to improve the down-link capacity, since the
implementation complexity is less critical at a base station (BS)
than at a mobile station (MS). This paper presents a transmitterbased
processing for the down-link direct-sequence code-division
multiple-access (DS/CDMA) systems with multiple transmit
antennas. We propose a combined pre-rake/pre-decorrelating
approach. This approach combines the advantage of pre-rake
scheme, to achieve diversity gain and average received signal-tonoise
ratio (SNR) gain, with that of pre-decorrelating scheme, to
suppress multiple access interference (MAI) and multipath interference
(MPI). Furthermore, to make the total transmit power
the same as that without pre-rake/pre-decorrelating processing,
two power normalization methods are presented. Simulation
results show that the proposed schemes significantly outperform
the conventional transmitter-based techniques. The effects of the
number of users and the block size on the bit error rate (BER)
performance are also investigated.
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