| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a system and a method for receiving spread spectrum radio signals propagated through multipath environment, such as the digital modulated signal of a code division multiple access communication system. SOLUTION: A rake receiver 10 used for a direct sequence code division multiple access communication system utilizes a new channel estimator 14 which can decompose multipath components at intervals closer than the one chip interval of a direct sequence 1 signature sequence. The estimator 14 utilizes a constrained iterative deconvalution technology using projection onto convex set(POCS) 18. In the embodiment of a matching filter 16 and the rake receiver 10, the delay Tsc between two taps of a delay line is shorter than the duration Tc of the chip of a pseudorandom number sequence. The rake receiver 10 constituted by this method can detect signals which are propagated through a multipath channel and have path components of intervals closer than the one chip of a signal sequence (for example, closer than the inverse of the signal bandwidth).</p> |
