Spatial Reciprocity of Uplink and Downlink Radio Channels in FDD Systems
نویسندگان
چکیده
We investigate the congruence of the directional properties of uplink (UL) and downlink (DL) as seen from the base station in WCDMA of UMTS by means of spatial channel measurements. Our study illustrates that the directional properties of the mobile radio channel are strongly correlated in uplink and downlink radio channels. Therefore, the utilization of spatial information derived during uplink reception for downlink smart antenna transmission is reasonable.
منابع مشابه
Channel Estimation for TDD/FDD Massive MIMO Systems with Channel Covariance Computing
In this paper, we propose a new channel estimation scheme for TDD/FDD massive MIMO systems by reconstructing uplink/downlink channel covariance matrices (CCMs) with the aid of array signal processing techniques. Specifically, the angle information and power angular spectrum (PAS) of each multi-path channel is extracted from the instantaneous uplink channel state information (CSI). Then, the upl...
متن کاملGraph Theory Based Approach to Users Grouping and Downlink Scheduling in FDD Massive MIMO
Massive MIMO is considered as one of the key enablers of the next generation 5G networks. With a high number of antennas at the BS, both spectral and energy efficiencies can be improved. Unfortunately, the downlink channel estimation overhead scales linearly with the number of antenna. This does not create complications in Time Division Duplex (TDD) systems since the channel estimate of the upl...
متن کاملA Simple DFT-aided Spatial Basis Expansion Model and Channel Estimation Strategy for Massive MIMO Systems
This paper proposes a new transmission strategy for the multiuser massive multiple-input multipleoutput (MIMO) systems, including uplink/downlink channel estimation and user scheduling for data transmission. A discrete Fourier transform (DFT) aided spatial basis expansion model (SBEM) is first introduced to represent the uplink/downlink channels with much few parameter dimensions by exploiting ...
متن کاملBackhaul-Aware Decoupled Uplink and Downlink User Association, Subcarrier Allocation, and Power Control in FiWi HetNets
Decoupling the uplink and downlink user association improves the throughput of heterogeneous networks (HetNets) and balances the traffic load of macro- and small- base stations. Recently, fiber-wireless HetNets (FiWi-HetNets) have been considered as viable solutions for access networks. To improve the accuracy of user association and resource allocation algorithms in FiWi-HetNets, the capacity ...
متن کاملCoded CSI Reference Signals for 5G - Exploiting Sparsity of FDD Massive MIMO Radio Channels
Future 5G systems are expected to provide higher performance, partly unleashed by massive MIMO as well as tight cooperation like joint transmission CoMP. For paired and unpaired spectrum below 6 GHz RF-frequency bands, frequency division duplex as well as time division duplex (FDD/TDD) has to be supported. The use of large cooperation areas over several cells together with massive MIMO downlink...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2002