Dual codebooks for MIMO beamforming
Başlık çevirisi mevcut değil.
- Tez No: 401218
- Danışmanlar: PROF. KEITH M. CHUGG
- Tez Türü: Doktora
- Konular: Elektrik ve Elektronik Mühendisliği, Electrical and Electronics Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2009
- Dil: İngilizce
- Üniversite: University of Southern California
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 97
Özet
Özet yok.
Özet (Çeviri)
The open loop multiple-input multiple-output (MIMO) wireless systems do not have any channel state information (CSI) at the transmitter (Tx). The closed loop systems have full CSI at the Tx. The closed loop systems have simpler receivers (Rx), and observe beamforming gain compared to the open loop systems. The open loop systems usually have some type of stream decoupling to limit the complexity of the iterative error correction. In closed loop systems, beamforming (BF) at the transmitter, and beamcombining (BC) at the receiver are simple spatial diversity techniques that increase the e ective signal to noise ratio (SNR) of the system and/or allow for multiple spatial streams of data. The optimal BF-BC systems require estimation of the channel at the receiver and transmission of the optimum beamforming vector back to the transmitter. In related research, authors de ne a codebook of beamforming vectors, and the receiver sends back the index of the vector that maximizes the SNR. In all of these methods the channel estimation and spatial stream decoupling at the receiver can be quite complex and time consuming. In this paper, a codebook method that does not require direct channel estimation at the receiver or the transmitter is proposed. The proposed method trades o Rx complexity and performance and is between open and closed loop MIMO BF methods. The method also has a simple stream decoupler than existing open loop methods. There is a beamforming vector codebook at the transmitter and a beamcombining vector codebook at the receiver. The codebook vector selection algorithm is based on maximizing the received signal to interference and noise ratio (SINR) per transmitted stream. Gains compared to the open loop methods are observed with the proposed method.
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