Data throughputs using multiple-input multiple-output (MIMO) techniques in a noise-limited cellular environment
Data throughputs using multiple-input multiple-output (MIMO) techniques in a noise-limited cellular environment
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DOI：
10.1109/7693.994816
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发表时间：
2002-04
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影响因子：
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通讯作者：
Severine Catreux-Erceg;P. Driessen;L. Greenstein
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文献类型：
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作者：
Severine Catreux-Erceg;P. Driessen;L. Greenstein
我们提出了一个通用的框架，以量化的数据吞吐量能力的无线通信系统时，它结合：（1）多个发射信号;（2）自适应调制每个信号;（3）自适应阵列处理在接收机。我们假设一个噪声受限的环境，对应于一个孤立的小区或多小区系统，其小区外干扰与热噪声相比很小。我们专注于用户的数据吞吐量，每秒比特/赫兹（bps/Hz），其平均多径衰落，我们称之为用户频谱效率。首先，一种分析方法被开发来找到的概率分布和平均值的频谱效率的用户位置和阴影衰落，都作为一个函数的用户距离其服务基站和平均的小区覆盖区域。我们假设衰落条件和接收机处理，借给自己的封闭形式的分析。由此产生的公式计算简单明了，它们提供了许多有价值的见解。接下来，我们运行蒙特卡罗模拟，既要确认分析，又要处理不太适合简单分析的情况。本文的一个关键贡献是一个简单的公式的平均频谱效率的传播指数，平均信号-噪声比在小区边界，天线的数量，和类型的编码。在典型的传播条件下，使用三个发射天线和三个接收天线的平均频谱效率范围从19.2 bps/Hz（未编码）到26.8 bps/Hz（理想编码），突出了多路传输与自适应技术相结合的潜在优势。这比在相同条件下使用单个发射机和三倍接收分集的链路的频谱效率高得多，其中范围是从8.77 bps/Hz到11.4 bps/Hz。此外，后者的结果是不太实际的实现，因为他们可以为大的信号星座，这将是非常容易受到损害。
We present a general framework to quantify the data throughput capabilities of a wireless communication system when it combines: (1) multiple transmit signals; (2) adaptive modulation for each signal; and (3) adaptive array processing at the receiver. We assume a noise-limited environment, corresponding to either an isolated cell or a multicell system whose out-of-cell interference is small compared with the thermal noise. We focus on the user data throughput, in bits per second/Hertz (bps/Hz), and its average over multipath fading, which we call the user spectral efficiency. First, an analysis method is developed to find the probability distribution and mean value of the spectral efficiency over the user positions and shadow fadings, both as a function of user distance from its serving base station and averaged over the cell coverage area. We assume fading conditions and receiver processing that lend themselves to closed-form analysis. The resulting formulas are simple and straightforward to compute, and they provide a number of valuable insights. Next, we run Monte Carlo simulations, both to confirm the analysis and to treat cases less amenable to simple analysis. A key contribution of this paper is a simple formula for the mean spectral efficiency in terms of the propagation exponent, mean signal-to-noise ratio at the cell boundary, number of antennas, and type of coding. Under typical propagation conditions, the mean spectral efficiency using three transmit and three receive antennas ranges from 19.2 bps/Hz (uncoded) to 26.8 bps/Hz (ideally coded), highlighting the potential benefits of multiple transmissions combined with adaptive techniques. This is much higher than the spectral efficiencies for a link using a single transmitter and a threefold receive diversity under the same conditions, where the range is from 8.77 bps/Hz to 11.4 bps/Hz. Moreover, the latter results are not nearly as practical to achieve, as they can for large signal constellations that would be highly vulnerable to impairments.