Signal detection method and receiving apparatus in MIMO system
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H03D-001/04
H03D-001/06
H03K-005/01
H03K-006/04
H04B-001/10
H04L-001/00
H04L-025/08
출원번호
US-0930047
(2007-10-30)
등록번호
US-8098777
(2012-01-17)
우선권정보
KR-10-2006-0122858 (2006-12-06)
발명자
/ 주소
Bahng, Seung-Jae
Bang, Young-Jo
Park, Youn-Ok
출원인 / 주소
Samsung Electronics Co., Ltd.
대리인 / 주소
Jefferson IP Law, LLP
인용정보
피인용 횟수 :
0인용 특허 :
8
초록▼
The present invention relates to a signal detection method and a receiving apparatus in a multiple input multiple output (MIMO) system. More particularly, the present invention relates to a signal detection device in a MIMO system using a spatial multiplexing (SM) method. In the signal detection met
The present invention relates to a signal detection method and a receiving apparatus in a multiple input multiple output (MIMO) system. More particularly, the present invention relates to a signal detection device in a MIMO system using a spatial multiplexing (SM) method. In the signal detection method, a channel is estimated and layers are rearranged according to a predetermined layer arrangement rule. QR-decomposition is performed by using a rearranged system model, all constellation points in a symbol of a layer having the lowest reliability are considered, and symbols are detected by using a sequential interference elimination method.
대표청구항▼
1. A receiving apparatus of a multiple input multiple output (MIMO) system, the receiving apparatus comprising: a layer arrangement unit for rearranging channel estimated layers for a received signal based on reliability of the each of the layers, wherein the reliability of each of the layers is det
1. A receiving apparatus of a multiple input multiple output (MIMO) system, the receiving apparatus comprising: a layer arrangement unit for rearranging channel estimated layers for a received signal based on reliability of the each of the layers, wherein the reliability of each of the layers is determined based on a reception quality of each of the layers; anda symbol detection unit for detecting a transmission symbol vector according to the layers that are rearranged by the layer arrangement unit, wherein the symbol detection unit detects the transmission symbol vector according to the layers rearranged by the layer arrangement unit by: QR-decomposing a channel matrix H rearranged after the layer arrangement unit rearranges the channel estimated layers for the received signal, based on the reliability of the each of the layers;considering all constellation points for a symbol of a layer having a lowest reliability among the layers rearranged after the layer arrangement unit rearranges the channel estimated layers for the received signal based on the reliability of the each of the layers, based on signals obtained by applying a matrix QH to the received signal; anddetecting the symbol by performing sequential interference elimination. 2. The receiving apparatus of claim 1, wherein the reception quality of each of the layers is determined based on a signal-to-noise ratio (SNR) of each of the layers when the layer arrangement unit rearranges the layers. 3. The receiving apparatus of claim 1, wherein the layer arrangement unit arranges the layer having the lowest reliability as a last layer, and remaining layers are arranged in order of a layer having a second lowest reliability to a layer having a highest reliability. 4. The receiving apparatus of claim 3, wherein the symbol detection unit detects a symbol by performing sequential symbol elimination for the remaining layers. 5. A receiving method of a multiple input multiple output (MIMO) system, the receiving method comprising: a) rearranging channel estimated layers for a received signal based on reliability of the each of the layers, wherein the reliability of each of the layers is determined based on a reception quality of each of the layers; andb) detecting a transmission symbol vector according to the layers rearranged by a layer arrangement unit, wherein the detecting of the transmission symbol vector according to the layers rearranged by the layer arrangement unit comprises: b-1) QR-decomposing a channel matrix H rearranged after a); andb-2) considering all constellation points for a symbol of a layer having a lowest reliability among the layers rearranged after a) based on signals obtained by applying a matrix QH to the received signal, and detecting the symbol by performing sequential interference elimination. 6. The receiving method of claim 5, wherein, in a), a channel estimation unit estimates and compensates a signal distortion caused by multipath fading of a transmission channel with respect to the received signal. 7. The receiving method of claim 5, wherein, in a), the layer having the lowest reliability is arranged as a last layer, and remaining layers are arranged in order from a layer having a second lowest reliability to a layer having a highest reliability. 8. The receiving method of claim 7, wherein a) comprises: a-1) calculating an inverse matrix G to represent a channel characteristic of the received signal by using an equation: G={tilde over (H)}−1, where {tilde over (H)} denotes a MIMO channel before rearrangement. 9. The receiving method of claim 8, wherein a) further comprises: a-2) arranging and considering all constellation points of the layer having the lowest reliability by using an equation: {tilde over (y)}=Hx+ñ, where {tilde over (y)}=[{tilde over (y)}1 {tilde over (y)}2 {tilde over (y)}3 {tilde over (y)}4]T denotes a received signal, x=[x1 x2 x3 x4]T denotes a rearranged transmission signal, ñ=[ñ1 ñ2 ñ3 ñ4]T denotes noise, and H=[h1 h2 h3 h4]T denotes a 4×4 estimated channel matrix after the rearrangement, wherein the rearranged signals are arranged in order of x4, a symbol of the layer having the lowest reliability, x3, a symbol of the layer having the highest reliability, x2, a symbol of the layer having the second highest reliability, and x1, a symbol of the layer having the third highest reliability, based on a signal-to-noise ratio (SNR). 10. The receiving method of claim 5, wherein, in b-1), the rearranged channel matrix H is QR-decomposed by using an equation: H=QR=Q[r11r12r13r140r22r23r2400r33r34000r44],wherein Q denotes an orthogonal matrix, and R denotes an upper triangular matrix in which upper elements including diagonal elements have non-zero values. 11. The receiving method of claim 10, wherein, in b-2), when performing sequential interference elimination, symbols are sequentially detected by using characteristics of an R matrix with respect to the symbol of the layer having the lowest reliability. 12. The receiving method of claim 11, wherein, when x=[x1 x2 x3 x4]T denotes a rearranged signal received from the layer arrangement unit, a mapping to closest constellation points is determined, with respect to a symbol x4 of the layer having the lowest reliability, by using equations: x3=slicing(y3-r34x4r33),x2=slicing(y2-r23x3-r24x4r22),andx1=slicing(y1-r12x2-r13x3-r14x4r11)wherein y1, y2 and y3 are received signals. 13. The receiving method of claim 10, wherein a symbol vector having a least maximum likelihood (ML) metric is detected as a final transmission vector from symbol vectors corresponding to the number of constellation points by using an equation: arg min∥y−Rx∥2,wherein y is a received signal, R is an upper triangular matrix and x is a rearranged transmission signal.
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