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A low-complexity adaptive transmission scheme based on the dual-codebook of 3GPP LTE-advanced

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3 Author(s)
Minxia Hu ; Nat. Mobile Commun. Res. Lab., Southeast Univ., Nanjing, China ; Shi Jin ; Xiqi Gao

In order to meet the peak spectral efficiency requirements of up to 30 bit/s/Hz, LTE-Advanced supports up to eight transmit antennas in its downlink, for which a dual codebook is agreed for precoding. In the dual-codebook approach, the precoding matrix to be used is obtained via the multiplication of two precoding matrices Wi and W2 selected from each of the dual-codebook. For adaptive precoding under this configuration, user equipment (UE) is required to include in its feedback information the precoding matrix indicators (PMIs) corresponding to both Wi and W2. In this paper, we propose a low-complexity precoding select method to select Wi and W2 separately, considering the the dual-codebook functionality. In the proposed scheme, a Wi for every possible rank will be chosen firstly according to the principal directions of the long-term channel and thereafter an appropriate rank and W2 are sought to maximize the sum minimum mean square error (MMSE) rate. Besides, UE will feed back a channel quality indicator (CQI) for each codeword to signal the supported adaptive modulation and coding scheme to achieve a target codeword error ratio (CWER). Simulation results show that the proposed scheme has a comparable performance with the general extensive joint select method but with a substantially reduced complexity due to the significantly reduced number of channel inversions.

Published in:

Wireless Communications and Signal Processing (WCSP), 2011 International Conference on

Date of Conference:

9-11 Nov. 2011