自适应比特功率分配的MIMO OFDM系统性能
Study on the MIMO OFDM Systems with Adaptive Bit and Power Allocation
-
摘要: 该文首先分析了多天线发射和接收(MIMO)的OFDM系统模型。然后针对在多径衰落信道下，OFDM中一些深度衰落的子载波降低了系统性能。该文把一般多载波系统中的自适应比特功率分配算法推广应用到多天线OFDM系统中。同时研究了自适应MIMO OFDM系统的频谱效率。仿真结果表明，自适应比特功率分配提高了MIMO OFDM的误比特率性能和频谱效率。Abstract: The multiple antenna Orthogonal Frequency Division Multiplexing(OFDM) system model is analyzed in this paper. Considering that Multiple-Input Multiple-Output(MIMO) channel can be separated into parallel subchannels by means of the singular value decomposition, and deep faded subcarriers may degrade the OFDM system perfor mance, the adaptive bit and power allocation for MIMO OFDM system are proposed. The analysis and simulation results show that the proposed adaptive MIMO OFDM improves bit error rate performance and spectral efficiency of the system.
-
Raleigh G G, Cioffi J M. Space-temporal coding for wireless communications. In Proc. of Globecom, London, 1996: 1809-1814.[2]Ye Li, Chuang J C, Sollenberger N R. Transmitter diversity for OFDM systems and its impact on high rate data wireless networks. IEEE Trans. J. on SAC, 1999, 17(7): 1233-1243.[3]Chow P, et al.. A practical discrete multitone transceiver loading algorithm for data transmission over spectrally shaped channels. IEEE Trans. Comm., 1995, COM-43(2): 773-775.[4]Campello J. Optimal discrete bit loading for multicarrier modulation systems. In Proc. of ISIT,Cambrige, USA, 1998: 193.[5]Campello J. Discrete bit loading for multicarrier modulation systems. [Ph.D Thesis], Stanford University, 1999.[6]Wong K, Lai S, Cheng R S, Letaief K B, Murch R D. Adaptive spatial-subcarrier trellis coded MQAM and power optimization for OFDM transmission. In Proc. of VTC, Boston, USA, 2000:2049-2053.[7]Chung S T, Goldsmith A J. Degrees of freedom in adaptive modulation: a unified view. IEEE Trans. on Comm., 2001, COM-49(9): 1561-1571. -
计量
- 文章访问数: 1952
- HTML全文浏览量: 99
- PDF下载量: 589
- 被引次数: 0
下载:
