| 主权项 |
1. A signal decoder for decoding signal elements in a communication signal in a communication system, the communication signal comprising interleaved carrier frequencies, the decoder comprising
an input interface for receiving antenna signals in a frequency domain, a multiplier for multiplying the antenna signals by a complex-valued mathematical sequence, cyclically shifted versions of the sequence imposed on a signal resulting in zero correlation with one another to generate multiplied antenna signals on a multiplier interface, an inverse frequency to time converter coupled to the multiplier interface for converting the multiplied antenna signals from frequency domain signals to time domain signals on a time domain interface, a signal quality detector coupled to the time domain interface for detecting a signal quality from the time domain signals based on a subset of the carrier frequencies, wherein the complex-valued mathematical sequence is a Zadoff-Chu sequence, the Zadoff-Chu sequence provided with zero values corresponding to carrier frequencies that are not included in the subset, the subset is arranged according to a comb function having carrier frequencies interleaved with carrier frequencies not being part of the subset, and the multiplier is configured to multiply the antenna signals by the complex-valued mathematical sequence, wherein the complex-valued mathematical sequence is provided with zero values according to the comb function, and the inverse frequency to time converter has a transform size corresponding to the multiplied antenna signals including all carrier frequencies. |
