Transmit diversity method applied to transmission system and transmission system of multiple transmission paths
A transmission path and transmission system technology, applied in the field of transmission diversity and multi-transmission path transmission systems applied to the transmission system, can solve the problems of burden, insignificant effect, and no way to solve the destructive superposition of transmission signals.
Active Publication Date: 2014-12-10
REALTEK SEMICON CORP
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[0003] For transmission diversity, the simplest method is to directly transmit signals through multiple transmission paths without any processing. However, since the transmitted signals will reach the receiving end through different paths in the wireless channel, these transmitted signals will be transmitted at the receiving end. Constructive and destructive overlay effects
Another simple method is to use cyclic shift technology to make a specific delay on each OFDM time domain signal, but this technology does not solve the possibility of destructive superposition of transmitted signals property, it can only reduce the possibility of destructive superposition of multiple frequencies at the same time, and its effect is not significant
Another feasible approach is to use STBC's orthogonal coding method to allow the receiver to separate signals from different transmission paths, but this method requires the receiver to have the ability to decode STBC
In addition, the beam-forming technology is to pre-process the transmitted signal to ensure that the transmitted signal is constructively superimposed at the receiving end, but this method requires accurate channel estimation at the receiving end, and this method The required signal processing will also cause a certain degree of burden on the hardware of the transmitting end
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[0034] In the following embodiments, a variety of transmit diversity methods are proposed for a transmission system with multi-transmission paths. The transmit diversity technology can be used to make the receiving end without changing the structure of the receiving end. The end can have better reception quality, which can be applied to Orthogonal Frequency Division Multiplexing (OFDM) transmission. The main concept of the present invention is to use a transmission path selector (TX Chain selector) to determine which parallel data stream carried by each sub-carrier (sub-carrier) should be used before OFDM modulation. Since each sub-carrier is transmitted by only one transmission path, there will be no mutual interference of transmitted signals at the receiving end. In addition, since the number of sub-carriers actually transmitted by each transmission path is less than the original number, each transmission path can appropriately increase its overall transmission power, so tha...
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The invention discloses a transmit diversity method applied to a transmission system, which comprises the following steps of: receiving a serial data stream, and converting the serial data stream into a plurality of parallel data streams, wherein each parallel data stream is carried by a corresponding subcarrier; and aiming at each subcarrier, selecting a single transmission path from at least two transmission paths of the transmission system to transmit the parallel data stream carried by the subcarrier. The transmit diversity method also comprises the step of: dividing the plurality of parallel data streams carried by the subcarriers into M groups, wherein the parallel data streams in the same group are transmitted by selecting the same transmission path.
Description
technical field [0001] The present invention relates to a transmission diversity method applied to a transmission system and its related transmission system, especially to a transmission path selected from at least two transmission paths of the transmission system for each subcarrier A device and method for parallel data streams carried by the sub-carrier. Background technique [0002] Orthogonal frequency division multiplexing (OFDM) transmission technology has been widely adopted in high-speed wireless local area networks. In order to improve the quality of transmission and reception, transmission systems currently on the market are configured with several transmission paths to simultaneously transmit signal. However, the use of multiple transmission paths will increase the hardware cost of the system, and the transmission and reception situation cannot be improved by increasing the number of transmission paths for the device itself. Therefore, the technology of transmit...
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IPC IPC(8): H04B7/02H04L27/26
Inventor 林郁男颜光裕
Owner REALTEK SEMICON CORP