A structural codebook design algorithm is proposed in this paper, which is aimed at considerably reducing the computational burden during the coding process of vector quantization (VQ) while having almost no extra sto...
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ISBN:
(纸本)0819422355
A structural codebook design algorithm is proposed in this paper, which is aimed at considerably reducing the computational burden during the coding process of vector quantization (VQ) while having almost no extra storage cost. Kohonen's self-organizing feature map (sofm) algorithm is improved as to tackle two problems in codebook design. Since the address of currently coded block is often the same as that of the previously coded neighboring blocks, especially in the flat regions, an address-dependent vector quantization (ADVQ) scheme is proposed to further reduce the bit rate and computational complexity. The simulation results show that the ADVQ scheme can achieve a bit-rate reduction of 37% for a typical image ''Lena'' while the computational complexity is reduced by a factor of 20.
To reduce the severe performance degradation of the traditional antenna selection schemes in correlated channels, this paper proposes a new antenna selection scheme via the self-organizing feature map (sofm) algorithm...
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ISBN:
(纸本)9781424458219;9781424458240
To reduce the severe performance degradation of the traditional antenna selection schemes in correlated channels, this paper proposes a new antenna selection scheme via the self-organizing feature map (sofm) algorithm which exploits spatial local related statistical information in fully correlated channels to improve the spatial adaptability. sofm algorithm classifies N available antennas into L classes: antennas in each class are strongly correlated but antennas between different classes are weak correlated or uncorrelated. Thus, one antenna in each class offers the possibility of almost-optimum selection and increases the rank of the correlated fading channel matrix. These increments, directly, contribute to the Effective Degree Of Freedom (EDOF) of the channel and hence the performance. Through simulations, it was demonstrated that the proposed scheme provides excellent performance in correlated MIMO channels.
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