56results about How to "Guaranteed demodulation performance" patented technology

The invention discloses a method and a device for measuring signal to noise ratio, and application thereof. The method comprises the following steps of: performing frequency-domain de-noising on a received uplink signal; performing fast Fourier inverse transform on the uplink signal subjected to the frequency-domain de-noising to acquire a time-domain channel impulse response; acquiring the power of each tap according to the time-domain channel impulse response; and utilizing the power of each time-domain tap to estimate the signal to noise ratio. Through the method and the device for measuring the signal to noise ratio, and the application thereof, the signal to noise ratio of the uplink signal in a long-term evolution LTE system can be effectively measured and the demodulation performance of blind detection on uplink acknowledgement response ACK or non-acknowledgement NACK signals is ensured.

The invention discloses a demodulation reference signal transmission method and network equipment. The method includes: according to the mapping type of the service channel, the number of transmitted symbols and the number of symbols of the demodulation reference signal DMRS, determining whether to configure a corresponding service channel for the service channel. DMRS; when it is determined to configure the corresponding DMRS for the traffic channel, configure the target number of DMRS for the traffic channel; map the target number of DMRS to the target transmission resource for transmission. The network device of the present invention determines whether to configure the corresponding DMRS for the service channel according to the mapping type of the service channel and the number of symbols transmitted by the service channel, and further configures the target number of DMRS for the service channel to ensure the demodulation of the service channel in various scenarios performance to ensure the correct transmission of data.

Disclosed in the present application are a method, apparatus and system for adjusting transmission power and indicating the same, which are for use in a system adopting the HSUPA technology to ensure the demodulation performance of E-UCCH on the network side. The method is as follows: an RNC enables UE to be informed, by way of signalling, of the receiving demodulation threshold of the E-UCCH information on an E-PUCH, then the UE sets the initial transmission power on the E-PUCH as a threshold transmission power corresponding to the above receiving demodulation threshold, so that when the UE subsequently carries out an incremental adjustment on the above initial transmission power to acquire a target transmission power on the E-PUCH, even if the target transmission power is reduced as compared with the authorized transmission power acquired by the UE on the E-PUCH, it will still be capable of giving priority to ensuring the demodulation performance of the E-UCCH information on the E-PUCH, thereby improving the system's service reliability. At the same time, the present application provides an apparatus and system corresponding to the method described above.

The invention relates to an optimization method of a measurement control message of a TD-SCDMA system, a method for acquiring a co-frequency interference neighbor cell list by a terminal and the terminal. The measurement control message at least comprises ID information of co-frequency neighbor cells of the cell located by the terminal, and the optimization method of the measurement control message comprises the step of adding auxiliary frequency point information of different-frequency neighbor cells of the cell located by the terminal in the measurement control message. The method for acquiring the co-frequency interference neighbor cell list by the system terminal comprises the steps of using the terminal for receiving the measurement control message which is issued from a network and comprises the auxiliary frequency point information of the different-frequency neighbor cells of the cell located by the terminal, using the terminal for acquiring the information of a first neighbor cell with a main frequency point which is the same with a working frequency point of the terminal from the measurement control message, using the terminal for acquiring the information of a second neighbor cell with an auxiliary frequency point which is the same with the working frequency point of the terminal from the measurement control message, and using the terminal for acquiring the co-frequency interference neighbor cell list through the acquired information of the first neighbor cell and the information of the second neighbor cell.

The provided method comprises: measuring the background noise of subzone for real noise power to obtain the current upper loading value; according to relation between current and set load value, controlling the upper loading. This invention can improve system performance well.

The invention discloses a 16QAM demodulation method in a time division synchronous code division multiple access system, comprising the steps of: rotating the received signal and the coordinates of the constellation diagram where it is located by 45 degrees clockwise, and calculating the possible logarithmic likelihood ratio  of b0 0, 0 takes the maximum value of the calculation results, if 0 is greater than 0, then b0 is 0, otherwise b0 is 1; rotate the aforementioned signal and the coordinates of the original constellation diagram counterclockwise by 45 degrees, and calculate b1 according to the aforementioned method; according to b0, The demodulation result of b1 adjusts the aforementioned signal, and calculates 2 and 3 according to 2=x+y, 3=y-x. If the calculation result is greater than 0, the demodulation result of the corresponding bit is 0; otherwise, the demodulation result is 1. The present invention adopts the combination of phase rotation and segmented function, demodulation soft judgment mode, realizes 16QAM soft demodulation conveniently, not only has less calculation amount, but also guarantees demodulation performance effectively, thereby improves 16QAM in TD-SCDMA system demodulation efficiency and quality.

A cosine signal and Chirp signal combined signal modulating and demodulating method and a signal transmitting and receiving method based on the method relate to a modulating / demodulating method and a transmitting / receiving method of the signal. The invention settles the problem that the system performance is easily affected by the nonorthogonality between the dot signals of each constellation whenthe prior 8PSK or 16PSK modulation mode is adopted and lower system capability when the QPSK modulating mode is adopted. The modulating method is that the four binary digital signals and four orthogonal intermediate frequency signals obtained after series / parallel conversion are modulated for obtaining four modulating signals. The demodulating method is that the mixed signal to be demodulated isrespectively matched and correlated with four orthogonal intermediate frequency signals for obtaining the demodulated information after integral determination demodulation. The transmitting process isthat the received mixed signal is superposed after modulation and is transmitted after upconversion and bandpass processing. The receiving process is that the demodulated information is converted tothe demodulation information. The cosine signal and Chirp signal combined signal modulating and demodulating method and signal transmitting and receiving method based on the method are suitable for the modulating / demodulating process of the signal.