139results about How to "Good bit error characteristics" patented technology

The invention provides a method for spread spectrum modulation and demodulation of code element grouping time-shifting position. A method for the spread spectrum modulation is on the basis of a good autocorrelation characteristic of a direct spread code. On the basis of primary direct sequence spread spectrum modulation, secondary time-shifting position modulation is conducted on spread spectrum modulation code elements and the spread spectrum modulation code elements after the secondary time-shifting position modulation are overlaid to a route of signals to be output; the secondary time-shifting position modulation of the spread spectrum modulation code elements is added by the method for the spread spectrum modulation, so that the transmission rate of a system is greatly improved; specific positions of the spread spectrum modulation code elements are detected firstly by a method for the spread spectrum demodulation and information carried by the positions is demodulated, so that position demodulating data are obtained, information carried by the spread spectrum modulation code elements is modulated on this basis until direct spread demodulating data are obtained, and finally the demodulated data are output according to a prior data stream format.

The invention discloses an anti-interference radio signal framing modulation method for a multimedia broadcast single-frequency network. The method is a time domain / frequency domain / space domain hybrid framing modulation scheme. The anti-interference radio signal framing modulation method for the multimedia broadcast single-frequency network has the advantages of low peak to average power ratio, short synchronization time, anti-interference performance, multi-service controllability and the like.

The invention discloses an anti-noise digital mobile broadcast signal transmitting method, which relates to a time domain-frequency domain hybrid transmitting scheme. The anti-noise digital mobile broadcast signal transmitting method has the advantages of low peak-to-average power ratio, short synchronization time, noise resistance, multi-service controllability, and the like.

The invention discloses an anti-interference wireless multimedia broadcast signal framing modulation method for a single frequency network, which is a time domain / frequency domain / space domain hybrid framing modulation scheme. The anti-interference wireless multimedia broadcast signal framing modulation method for the single frequency network has the advantages of low peak-to-average power ratio, short synchronization time, anti-channel interference performance, multi-service controllability and the like.

The invention discloses an anti-interference transmission method for a digital broadcast wireless signal. The method is a time domain / frequency domain combined transmission scheme. The anti-interference transmission method has the advantages of low peak-to-average power ratio, short synchronization time, anti-interference performance, multi-service controllability and the like.

The invention discloses an anti-fading digital mobile broadcast signal transmission method which is a time domain frequency domain mixed transmission scheme. The anti-fading digital mobile broadcast signal transmission method of the present invention has the advantages of low peak-to-average power ratio, short synchronization time, fading resistance, control of multiple services and the like.

The invention discloses a robust transmission method for digital broadcasting wireless signals, which is a time domain and frequency domain hybrid transmission scheme. The method has the advantages of low peak-to-average power ratio, short synchronous time, robustness, controllability in multiple services and the like.

The invention discloses an anti-fading mobile multimedia broadcasting signal framing modulation method which is a time domain and frequency domain mixed framing modulation scheme. The anti-fading mobile multimedia broadcasting signal framing modulation method provided by the invention has the advantages of low peak average power rate, short synchronous time, fading resistance, capability of controlling multiple services, and the like.

The invention discloses a robust digital mobile broadcast signal transmitting method, which relates to a time domain-frequency domain hybrid transmitting scheme. The robust digital mobile broadcast signal transmitting method has the advantages of low peak-to-average power ratio, short synchronization time, robustness, multi-service controllability, and the like.