DC 欄位 |
值 |
語言 |
DC.contributor | 電機工程學系 | zh_TW |
DC.creator | 王銓 | zh_TW |
DC.creator | Chuan Wang | en_US |
dc.date.accessioned | 2013-8-6T07:39:07Z | |
dc.date.available | 2013-8-6T07:39:07Z | |
dc.date.issued | 2013 | |
dc.identifier.uri | http://ir.lib.ncu.edu.tw:88/thesis/view_etd.asp?URN=995201052 | |
dc.contributor.department | 電機工程學系 | zh_TW |
DC.description | 國立中央大學 | zh_TW |
DC.description | National Central University | en_US |
dc.description.abstract | 本篇論文主題為適用3GPP-LTE/LTE-A 的架構下的預編碼碼簿的選擇,長期演進技術
/長期演進技術昇級版(3GPP-LTE/LTE-A)為4G 技術之一,除了提供更高的吞吐量也同時支
援動態傳輸的不同工作模式的選擇,本篇論文即利用動態傳輸中閉環路(close-loop)傳輸
的概念。 閉環路傳輸利用接收端回傳給傳送端的通道資訊,來得到更好的傳輸品質,
接收端根據碼簿的選擇方法做出選擇,再將所選的碼簿資訊回傳給傳送端,為整體預編
碼傳輸的概念。
本篇論文選擇的為 K-Best 的球型解碼器,球型解碼器在解碼的效果上比傳統的
MMSE 與ZF 演算法來的更精準,但同時也需要付出較高的硬體複雜度,在此利用的是
略為減低其複雜度的K-Best 球型解碼器,並利用所提出的Trace criterion 來將經過QR 分
解的R 矩陣取得各層的平衡,最後我們將不同排序種類的QR 分解與我們所提出的Trace
Criterion 作結合,以達到更好的效果。本篇論文在模擬的部分選擇適用於3GPP-LTE 底下
的碼簿進行模擬,在最後的模擬結果也可見,所提出的方法確實有不錯的增益。
另外考慮到LTE 時頻域衰退通道的影響與降低運算量的需求,我們選擇使用分群作
為方法,這邊提出的分群方法,可以有效避免大量的效能衰退,也具有相當大的運算量
降低功能。
在硬體實作方面則使用所提出的預編碼系統下的關鍵性模組—高吞吐量之8×8
Sorted QR 分解—進行設計,最大特色為同時運算3 個4×4 Sorted QR 分解,並且提供不
同層數的排序功能以搭配前述的預編碼選擇機制。 | zh_TW |
dc.description.abstract | Precoder Selection Under MIMO Detection
for 3GPP-LTE/LTE-A Systems
Abstract
Precoding by using a finite-set codebook at transmitters is an effective approach to
improve the performance of multiple-input multiple-output (MIMO) systems with reduced
feedback overhead. K-Best sphere decoders are popular for high-throughput
spatially-multiplexed MIMO signal detection at receivers.
In this paper, we propose a precoding-matrix-index (PMI) selection criterion suitable for
K-best MIMO detectors by minimizing the trace of the upper triangular matrix after QR
decomposition (QRD). To further improve the system performance, fully-sorted QRD,
per-layer sorted QRD and partially-sorted QRD are also proposed to be incorporated in the
minimum-trace PMI selection criterion. Simulation results based on the MIMO codebooks of
3GPP-LTE/LTE-A systems show the improvements of the proposed scheme compared to the
non-precoding MIMO schemes and the precoding schemes using the conventional PMI
selection criterions.
Considering the fading channel in time/frequency domain of LTE system, we propose a
group solution, which not only provide much lower computation, but also avoid more
degradating.
As to the hardware implementation, we use a scalable design of high throughput 8×8
Sorted QRD. It can compute three sets of 4×4 Sorted QRD simultaneously. Various numbers
of sorting layers are supported for our proposed precoding criterion. | en_US |
DC.subject | 第三代合作夥伴計劃 | zh_TW |
DC.subject | 4G | zh_TW |
DC.subject | 預編碼 | zh_TW |
DC.subject | 分群 | zh_TW |
DC.subject | 3GPP | en_US |
DC.subject | 4G | en_US |
DC.subject | Precoding | en_US |
DC.subject | Group | en_US |
DC.title | 適用於 3GPP-LTE/LTE-A多輸入輸出系統之預編碼 選擇方案 | zh_TW |
dc.language.iso | zh-TW | zh-TW |
DC.title | MIMO Precoder Selection for 3GPP-LTE/LTE-A Systems | en_US |
DC.type | 博碩士論文 | zh_TW |
DC.type | thesis | en_US |
DC.publisher | National Central University | en_US |