39 results about "SC-FDE" patented technology

Provided are a system for channel sounding of broadband single carrier mobile communications and a method thereof. A channel sounding device is provided, which achieves precise modeling of a broadband mobile communication in a 5 GHz band. The channel sounding device can perform precise channel modeling by collecting broadband channel data of 20 MHz between a base station and a mobile station moving at maximum 150 km / h, using a sounding signal including a 802.15.3 preamble, a maximum length sequence (MLS) signal, and a single carrier frequency domain equalization (SC-FDE) symbol overcoming a limitation of signal distortion of an orthogonal frequency division multiplexing (OFDM) signal. The channel sounding device can simultaneously perform modeling of interference of an adjacent channel as well as a transmission channel.

Disclosed is a transceiving apparatus and method in which a space frequency block coding (SFBC) technique is applied to the SC-FDE technique. The transceiving method encodes an input signal into frequency-domain blocks so as to output at least two signal blocks in parallel to each other, inserts a cyclic prefix (CP) into the output signal blocks, and outputs the signal blocks through the same sub-channel using a corresponding antenna.

A transmission method using a massive MIMO (Multiple-Input and Multiple-Output) scheme with an arrangement 108 of Nm×Nb antenna elements at the transmitter, arranged in Nm sets of Nb antenna elements or Nb sets of Nm antenna elements based on SC-FDE (Single-Carrier with Frequency Domain Equalization) schemes with large constellations that is compatible with low-cost, highly-efficient, nonlinear amplifiers 106, while allowing spatial multiplexing gains.The transmission structure of this transmission method decomposes in 103 the modulated symbols from 102 associated to a given constellation as the sum of Nm polar components that are modulated as Nm BPSK (Binary Phase Shift Keying) signals. Each of these BPSK signals can be regarded as an OQPSK (Offset Quadrature Phase Shift Keying) signal in the serial format that is specially designed to have good tradeoffs between reduced envelope fluctuations and a compact spectrum.

The invention discloses to an SC-FDE system based on MAP equalization and a construction method of a pilot frequency structure in the SC-FDE system based on the MAP equalization, relates to the SC-FDE system and the construction method of the pilot frequency structure in the SC-FDE system, and is used for solving the problems of high peak-to-average ratio of signals emitted by an OFDM (Orthogonal Frequency Division Multiplexing) system and sensitivity on a frequency offset and a phase noise. A mapping signal input end of a mapping unit is connected with a signal output end of a signal generator, and a modulation signal output end of a modulator is connected with the signal input end of a signal channel; the signal output end of the signal channel is connected with the signal input end of a Fourier transform module; a transformation signal output end of the Fourier transform module is connected with a transformation signal input end of a signal channel estimating and balancing unit; the signal output end of the signal channel estimating and balancing unit is connected with the signal input end of the Fourier transform module; a demodulation output end of a demodulator is connected with a demodulation signal input end of a decoder; and a decoding signal output end of the decoder is connected with a decoding signal input end of a judging unit. According to the SC-FDE system based on the MAP equalization and the construction method of the pilot frequency structure in the SC-FDE system based on the MAP equalization, a multipath effect of a single carrier system is eliminated.

The invention discloses a method for phase and symbol synchronization, channel estimation and frequency domain equalization of an SC-FDE system, wherein a receiver in the method performs frame synchronization, fraction multiplication channel estimation and fraction multiplication frequency domain equalization on an over-sampling signal, and eliminates influences cause by carrier phases, multipathinterferences and frame synchronization errors through the fraction multiplication channel estimation and the fraction multiplication frequency domain equalization so as to achieve the timing synchronization and the frequency domain equalization of a carrier phase and a symbol of a modulated signal. The method has the characteristics of strong anti-multipath capability, capability of estimating and equalizing a multipath channel with fraction multiplication symbol period intervals, no limitation to signal demodulation mode and signal demodulation and detection method and the like, and is especially suitable for single-carrier frequency domain equalization and synchronization of modulation (such as FQPSK modulation, SOQPSK modulation, CPM modulation and other efficient linear modulations) signals with efficient power and spectrum.

The invention relates to a synchronization method and a synchronization device for a low signal-to-noise ratio SC-FDE system. The synchronization method includes: the sending end sends a data frame comprising a first training sequence A, a second training sequence B, a cyclic prefix CP and a data symbol, and the receiving end receives the data frame and performs the following steps: S1. Using the first training sequence A to adopt a parallel The code phase search algorithm detects the data frame, and obtains the coarse frequency offset estimation value to correct the coarse frequency offset value so as to obtain the data symbol after the coarse frequency offset correction; S2. Use the second training sequence B to perform fine frequency offset estimation, Correcting the fine frequency offset value to obtain the data symbol after the fine frequency offset correction; and S3. Using the second training sequence B to perform symbol timing estimation. The implementation of the present invention can effectively resist the influence of noise, and can realize a larger carrier frequency offset detection range, correct a sufficiently large frequency offset, and complete high-precision signal synchronization.

The invention discloses an integer frequency doubling offset and channel parameter joint estimation algorithm with an ultra-low complexity in a single carrier frequency domain equalization (SC-FDE) system. The algorithm comprises the following steps: (1) generating a training sequence; (2) obtaining a frequency domain signal of a receiving end; (3) constructing a mutual fuzzy function Doppler zero section of a Chu sequence; (4) constructing a metric function: utilizing the zero section of the Chu sequence to conduct joint estimation for an integer frequency doubling offset and channel parameter, and constructing the metric function; (5) obtaining integer frequency doubling offset estimation from the metric function; (6) obtaining corresponding time domain channel swashing response estimation according to the integer frequency doubling offset estimation. Characters of a mutual fuzzy function of the Chu sequence are utilized by the algorithm, the algorithm just needs using the zero section to construct an estimation metric function, and the algorithm not only can conduct estimation for integer frequency doubling offset, but also simultaneously can conduct channel estimation. Compared with a traditional algorithm, the algorithm which does not need multi-group cross-correlation operation has the ultra-low complexity.