CQI Quantization Scheme in Random Beamforming System 


Vol. 34,  No. 2, pp. 170-176, Feb.  2009


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  Abstract

It has been known that multiuser MIMO systems have better performance than single-user MIMO systems. However, multiuser MIMO systems should eliminate inter-user interferences which are generated by allocating data to multiple users simultaneously. There is zero-forcing beamforming (ZFBF) as scheme used widely among algorithms to eliminate inter-user interferences. But, it needs many feedback bits since BS knows quite exact channel state information to use this scheme in real systems. Random beamforming (RBF) was propsed to cope with a defect of ZFBF[1]. RBF is a multiuser scheme to send data to users who have optimal performance with predetermined codebook, each receiver feeds back a index of codeword which has optimal performance within the codebook and its CQI information. [1] assumes that the BS knows perfect CQI information of each receiver but CQI information should be quantized in the real systems. Therefore, in this paper, efficient CQI quantization scheme for RBF system is proposed.

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  Cite this article

[IEEE Style]

K. Ko and J. Lee, "CQI Quantization Scheme in Random Beamforming System," The Journal of Korean Institute of Communications and Information Sciences, vol. 34, no. 2, pp. 170-176, 2009. DOI: .

[ACM Style]

Kyeongjun Ko and Jungwoo Lee. 2009. CQI Quantization Scheme in Random Beamforming System. The Journal of Korean Institute of Communications and Information Sciences, 34, 2, (2009), 170-176. DOI: .

[KICS Style]

Kyeongjun Ko and Jungwoo Lee, "CQI Quantization Scheme in Random Beamforming System," The Journal of Korean Institute of Communications and Information Sciences, vol. 34, no. 2, pp. 170-176, 2. 2009.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880