Space hour coding method and corresponeded transmitting method, transmitter and communication system

Abstract

The invention discloses a new time space encoding method and its application in the condition of the space diversity and the time diversity. The encoding steps adopt the NXN dimension encoding to produce the array, and the linear transformation to every group of data. The array structure of the encoding is as follows: select a nonzero value in the first array; in the condition to guarantee the code symbols are not zero, the element of the NO. n array goes round an arbitrary angle to get the corresponding element of the NO. n+2 array. Every element in each one array is either completely same or is in quadrature to one another. When using the space diversity, set several antennas at the transmitting terminal, transmit the original data on the antennas alternatively after space time encoding and only use one antenna to receive at the transmitting terminal in order to get the effect of diversity. When using the time diversity, get the effect of STBC system of many antennas without increasing the number of the antennas and when the number is same as that of the STBC system, its performance is better than that of the STBC system.

Description

Technical field: [0001] The invention belongs to the technical field of mobile communication systems, and specifically relates to a space-time coding method and its corresponding transmitting method, transmitter and communication system under the conditions of space diversity and time diversity. Background technique: [0002] The development of modern communication requires that the mobile communication system can provide higher and higher data transmission rate. However, in a wireless communication system, due to the influence of the multipath environment, the mobile channel through which the transmission signal passes from the transmitter to the receiver will experience severe fading. Space-time coding is an effective means to overcome the impact of the defect of wireless channel on the transmission signal quality: STTC (space-time trellis coding) can provide the greatest possible diversity gain and coding gain without sacrificing the transmission bandwidth efficiency, but...

AI Technical Summary

Problems solved by technology

However, for complex signals, only when the number of transmitting antennas is 2, the code rate of STBC can reach 1; when the number of transmitting antennas is 3 and 4, the transmission rate of complex signal STBC can reach the maximum code rate If the number of transmitting antennas continues to increase, the transmission rate of this coding method will be reduced to the maximum code rate.

[0004] In addition, if the terminal moves at high speed, the channel experienced by the signal will experience fast fading

At this time, STBC will no longer apply

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