Multiple-subcarrier modulation for nondirected wireless infrared communication
Multiple-subcarrier modulation for nondirected wireless infrared communication
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DOI：
10.1109/49.490239
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发表时间：
1996-04-01
影响因子：
16.4
通讯作者：
Kahn, JM
中科院分区：
文献类型：
--
作者：
Carruthers, JB;Kahn, JM
本文研究了室内环境下无线红外数字通信中的多副载波调制（MSM）方案。强度调制与直接检测（IM/DD），这导致在输入上的非负约束的等效基带通道。调制方案的功率效率进行了比较，在30 Mb/s和100 Mb/s的合奏实验确定的多径信道。载波选择和功率整形的方法，提高MSM性能进行检查。据发现，MSM方案可以允许在更高的数据速率比单载波调制方案，而无需均衡的操作。此外，MSM方案可以更有效地利用带宽，并且还可以为信道的多址接入提供简单而灵活的方法。然而，它们的功率效率不如单载波方案，这将限制它们在功率不受限的应用中的使用。
We examine multiple subcarrier modulation (MSM) schemes for wireless infrared digital communication in the indoor environment. Intensity modulation with direct detection (IM/DD) is employed, which results in equivalent baseband channels with a nonnegativity constraint on the input. The power efficiencies of modulation schemes are compared at 30 Mb/s and 100 Mb/s over an ensemble of experimentally determined multipath channels. Carrier selection and power shaping are examined as methods for improving MSM performance. It is found that MSM schemes can allow operation at higher data rates than single-carries modulation schemes without equalization. Moreover, MSM schemes can be more bandwidth-efficient and also can provide a simple and flexible method for multiple access to the channel. However, they are not as power efficient as single-carrier schemes, and this will limit their use to applications which are not power limited.