Self-adaptive transmission diversity apparatus
A transmit diversity and self-adaptive technology, applied in space transmit diversity, polarization/direction diversity, diversity/multi-antenna system, etc., can solve the problems of separation difficulty, difficulty in forming incident wave radiation pattern, control of transmit power, etc.
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no. 1 example
[0034] Fig. 3 is a structural block diagram of an adaptive transmit diversity device according to a first embodiment of the present invention, Figure 4 It is a graph of the relationship between the incident direction of radio waves and the radiation pattern. Figure 5 It is a graph of the relationship between radio wave arrival time and power.
[0035] In the adaptive transmit diversity device shown in FIG. 3 , signals received by a plurality of receiving antennas 101 , 102 , 103 and 104 are A / D converted and despread in matched filters 105 , 106 , 107 and 108 . Multipliers 112 , 111 , 110 and 109 multiply the outputs of these matched filters 105 to 108 by the output of reception radiation pattern controller 121 .
[0036] The adder 122 adds the outputs of the multipliers 109 to 112 . Matched filters 113, 114, 115, and 116 perform A / D conversion and despreading operations on signals received by antennas 101 to 104. Multipliers 117 , 118 , 119 and 120 multiply the outputs o...
no. 2 example
[0064] Now, an adaptive transmit diversity device according to a second embodiment of the present invention will be discussed. Fig. 6 is a structural block diagram of an adaptive transmit diversity device according to a second embodiment of the present invention. Since the structure of the adaptive transmit diversity apparatus according to the second embodiment is basically the same as that shown in FIG. 3, the same components and methods are denoted by the same reference numerals to omit their detailed description.
[0065] The difference between the structure shown in FIG. 6 and the structure shown in FIG. 3 is that SIR measurement units 439 and 440 are used as the transmit radiation pattern controller 128 and a power detector for calculating the received signal power. In the first embodiment, by the received signal power |S 1 (t)| and |S 2 (t) | to calculate the received signal power, in the present embodiment, the SIR measurement units 439 and 440 of the detected power u...
no. 3 example
[0071] Now, an adaptive transmit diversity device according to a third embodiment of the present invention will be discussed. Since this embodiment differs from the first embodiment only in the structure of the transmit radiation pattern controller 128 and how to calculate the power of the received signal, this embodiment will be described with reference to FIG. 3 . It is assumed here that the received Figure 4 and 5 The received wave is shown.
[0072] The transmit and transmit radiation controller 128 measures the ratio of the required signal power to the interference signal power at each moment, and combines the patterns of the receive radiation pattern controllers 121 and 124 in such a manner as to maximize the ratio. For example, the transmit radiation pattern controller 128 utilizes the outputs W of the receive radiation pattern controllers 121 and 124 at each time 1 (t) and W 2 (t) and the required signal reception powers s1 and s2 are combined with the transmissio...
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