Quadrature frequency-division and time-division transmitter, receiver and method thereof

Abstract

Techniques are provided to support orthogonal multiple carriers frequency-time division multiplex based on orthogonal frequency division multiplex and single carrier with frequency domain equalization in prior art. At a transmitter end, Serial to Parallel Transform and Inverse Fast Fourier Transform are performed for the input serial data stream, then data blocks after IFFT are multiplexed to be a OFTDM symbol data part in temporal sequence; and then a circulation prefix is added in its front-part to form a final OFTDM symbol. At a receiver end, the CP in the front-part of the OFTDM symbol down-converted to a baseband is removed, and after the operations of data de-multiplex, FFT and P / S corresponding to the transmitter end are performed, the original serial data stream is recovered. Except for including the advantage of said prior art, this disclosure can overcome their disadvantage, and a preferable tradeoff between the general performance and complexity of the system can be acquired.

Description

Technical field [0001] The present invention relates to wireless communication technology, and more particularly, to a technology for transmitting signals through multiple orthogonal carriers in a wireless communication system. Background technique [0002] In wireless communication systems, especially in broadband mobile communication systems, air signal transmission technology is becoming the focus of research. In order to obtain higher, for example, up to 10bps / Hz, spectrum efficiency, support communication requirements in multiple scenarios, and support various adaptive control technologies, the signal transmission technology of broadband mobile communication systems must support more than any previous similar technology. Good performance while maintaining controllable implementation complexity. At present, the signal transmission technology of broadband mobile communication is mainly based on OFDM (Orthogonal Frequency Division Multiplexing) technology, and various variants ...

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Problems solved by technology

The implementation complexity of SC / FDE system is low (receiving end is based on FFT / IFFT transformation and single-point zero-forcing equalizer to complete frequency domain equalization), there are complete equalizer design criteria, signal peak-to-average ratio is not high, CP and data block length The design is relatively flexible, which is convenient for application in broadband wireless communication systems. However, the design of this scheme does not consider the adaptability to the time-frequency characteristics of the channel, making it difficult for the receiver to provide a large frequency-domain diversity gain for channel decoding. The comprehensive performance is not high; at the same time, the single-carrier receiving algorithm is likely to cause the consequences of noise enhancement and diffusion, which will also seriously affect the receiving bit error performance of the system

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