集聚器可以在一端有效地将ISDN信道合并在一起形成一个较宽的带宽，然后再另一端将信息再同步。
The aggregator effectively pulls together ISDN channels at one end to form a higher bandwidth and then re-synchronizes the information at the other end.
为了提高接收机的性能，一般采用RAKE接收等分集合并措施，这就需要准确的信道估计信息。
In order to improve the performance of receiver, the technology of RAKE diversity receiving is usually adopted, which needs the exact channel estimation information.
文中使用了改进的子空间跟踪信道估计算法，并仿真了不同信道估计方法、合并方法下系统的误比特率性能。
We use a modified subspace tracking channel estimation algorithm and simulate the system BER performance under different channel estimation approaches and combining methods.
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