TDE problems can be divided into TDEs of single path environment and multipath environment, while the later has practical application background and is a difficult one in TDE problems.
时间延迟估计可以分为单径时延估计和多径时延估计，而多径时延估计是时延估计问题中特别困难但又在实际问题中总是要解决的；
TDE problems can be divided into TDEs of single path environment and multipath environment, while the later has practical application background and is a difficult one in TDE problems.
时间延迟估计可以分为单径时延估计和多径时延估计，而多径时延估计是时延估计问题中特别困难但又在实际问题中总是要解决的；
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