基于矢量線性運(yùn)算的自適應(yīng)球帽差分反饋算法
doi: 10.11999/JEIT140598
基金項(xiàng)目:
國(guó)家自然科學(xué)基金 (61171104)資助課題
Adaptive Spherical-cap Differential Feedback Algorithm Based on Linear Operations of Vectors
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摘要: 信道時(shí)間相關(guān)多輸入多輸出(MIMO)系統(tǒng)中一種重要有限反饋策略為差分反饋，該文提出一種適用于單用戶多輸入單輸出(SU-MISO)系統(tǒng)的自適應(yīng)球帽差分反饋算法。首先，運(yùn)用相鄰時(shí)刻信道間的擾動(dòng)規(guī)律設(shè)計(jì)自適應(yīng)差分反饋策略；其次，不同于現(xiàn)有差分碼本的非線性構(gòu)造方法，提出一種基于矢量伸縮和合成的球帽差分碼本算法；最后，聯(lián)合球帽碼本空間分布規(guī)律和時(shí)間相關(guān)信道的統(tǒng)計(jì)規(guī)律推導(dǎo)出球帽半徑計(jì)算方法。仿真結(jié)果說明，該算法能準(zhǔn)確跟蹤信道并較現(xiàn)有算法有一定性能提高。
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關(guān)鍵詞:
- 無線通信 /
- 自適應(yīng)差分反饋 /
- 時(shí)間相關(guān)多輸入單輸出信道 /
- 球帽碼本
Abstract: In the MIMO systems, the differential feedback is an important strategy for temporally correlated channels. A new adaptive spherical-cap differential feedback algorithm is proposed for the Single-User Multiple Input Single Output (SU-MISO) systems. Firstly, this study effectively utilizes the channels disturbance between two consecutive time instants to design the adaptive differential feedback strategy. Secondly, based on vectors scaling and composition, a new spherical-cap differential codebook algorithm is proposed, which is different from the existing methods for constructing the non-linear model. Finally, the calculation method of spherical-cap radius is deduced by combining spatial distribution of the spherical-cap codebook with channels statistical regularity. The simulation results show that the proposed algorithm can accurately track the channel disturbance and has certain performance improvement than the existing algorithms. -
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