对无线通信业的发展介绍，对于我们了解未来4G或者更快更有效的通信系统很有帮助-Introduction of the development of the wireless communications industry, the future 4G or faster and more effective communication system is helpful for us to understand

4G将迎来一个全新的时代，无线网络是4G的一个要点，跨层设计则是无线网络运用中性能优化的一个重要举措。-4G will usher in a new era, the wireless network is a point of 4G, cross-layer design is an important measure of performance optimization in the use of wireless networks.

Orthogonal Frequency Division Multiplexing (OFDM) is a multicarrier modulation and multiplexing technique proposed for 3G, 4G LTE-A systems to achieve higher data rates with better spectral efficiency at low latency. Time varying nature of the wi

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