使用聯合部分QR分解之低複雜度128x7空間調變多輸出多輸入偵測器

A Low-Complexity 128x7 Spatial Modulation MIMO Detector with Joint Subset QR Decomposition

陳彥霖(Yen-Lin Chen)

指導教授 ： 黃元豪

國立清華大學/電機資訊學院/電機工程學系/碩士(2014年)

摘要

近年來，隨著資料傳輸以及對傳輸品質的要求遽增，促使研究者紛紛發展新的傳送技術，來達到高的throughput和spectral efficiency，例如:多輸入多輸出(MIMO)系統已廣泛的被使用在無線通訊上，但往往都忽略了一些能源消耗問題。在傳統MIMO系統上，能量使用效率會隨著使用的天線數(Multiple radio frequency (RF) chains)而線性遞減。 因此，研究者就提出了空間調變(spatial modulation,SM)的技術，SM是一種新興的多天線傳送技術，主要的概念是在大量天線的MIMO系統中，每次只使用一根傳送天線來傳送訊號，來達到減少RF chain的數量而提高能量使用的效率，如單輸入單輸出(SISO)系統一樣，但SM的資料傳輸卻能比SISO系統來的高，主要的原因是SM技術把額外的information bits資訊加載在每一根傳送天線索引上。現今，已有研究者發展大規模的MIMO(Large-scale MIMO or massive MIMO)系統，能使在傳送端能擺放很大數量的傳送天線。因此，在傳送端擁有夠多的傳送天線，SM系統就有更多的information能加載在傳送天線索引上來達到提高資料傳輸率的效果。另外，若系統同一時間啟動了兩根以上天線來傳送訊號，稱為SM-MIMO，藉此來達到更高傳輸速率，本論文主要探討SM-MIMO系統啟動兩根天線傳送訊號，提出一個聯合子集通道的概念，對每一個聯合子集通道做預先處理(pre-processing)，來降低接收端偵測器的複雜度。

關鍵字

空間調變多輸出多輸入 ； 低複雜度偵測器 ； QR分解

並列摘要

In recent years, due to the transmission data rates and growing link quality demand,
researchers develop new transmission technologies to achieve high data throughputs
and spectral eciency, such as multiple-input-multiple-output (MIMO) systems that is
widely used in wireless communication. However, the energy eciency is always not
taken into consideration. In traditional MIMO system, The energy eciency decreases
linearly with the number of active antennas (RF chains). In order to increase energy
eciency in wireless communication, the researcher proposes Spatial Modulation (SM)
that is a emerging and recently developed multiple-antenna transmission technique.
The main concept of SM is that using one active antenna to transmit signal in largescale
MIMO communications. Therefore, SM can achieve to reduce the number of
RF chain and increase energy eciency, such as Single-Input- Single-Output (SISO)
system. Beside, SM can improve transmission date rates compared to Single-Input-
Single-Output (SISO) system. This is because there are addition bits to be mapped
into antenna index. Nowadays, the researcher has been developed the large-scale MIMO
system. Therefore, the more the number of antenna at transmit, the higher data rates.
In addition, if the system at the same time has more than two active antennas to
transmit signals, which is termed as SM-MIMO. It can achieve higher transmission data
rates than SM system. In this thesis, we mainly SM-MIMO with two active antennas
and propose a joint subset channel concept and pre-processing each joint subset channel
to reduce the computational complexity of detector.

並列關鍵字

Spatial Modulation MIMO ； Low Complexity Detector ； QR decomposition

參考文獻

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