An OFDM-based system with dynamic packet assignment and interference suppression for advanced cellular Internet service

摘要

Future wireless networks are expected to employ packet access with high peak-bandwidths demands. This will impose a significant challenge for frequency reuse, especially for services deployed in a wide area. A dynamic packet assignment (DPA) method [1] has been proposed as a key component of the MAC protocol for an OFDM-based Advanced Cellular Internet Service (ACIS) system [2], which is targeted for applications such as Web browsing, with a peak downlink transmission rate on the order of 1 Mb/s using a wide-area cellular infrastructure. This method is able to allocate radio resources on a packet time scale and reassign them in about 100 msec, thereby gaining advantages in both statistical multiplexing of packet access and spectrum efficiency of dynamic channel assignment (DCA). In [1], it was shown that closed-loop SIR-based power control combined with DPA can achieve very high spectrum efficiency. However, the overhead required for power control iteration significantly reduces effective throughput. The contribution of this paper is two-fold: (1) Interference suppression is considered as an alternative for performance enhancement. (2) A detailed system description, for both downlink and uplink, is given to show how OFDM, DPA and interference suppression can be combined to support future high-speed wireless packet data services [3].