Multi-pass interference removal apparatus and multi-pass interference removal method
A multi-path interference and equipment technology, applied in multi-frequency code system, multiplex communication, orthogonal multiplex system, etc., can solve the problem of destroying subcarrier orthogonality, OFDM performance deterioration, interference power increase, etc. question
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Embodiment 1
[0065] In this example, the elimination from Figure 4 The case of interference (internal leakage) of valid symbols A in part X and part Y.
[0066] Figure 5 is a block diagram showing the configuration of a radio receiving apparatus equipped with a multipath interference canceling apparatus according to Embodiment 1 of the present invention.
[0067] Radio signals are received by radio receiving section 102 via antenna 101 . In the radio reception section 102, radio reception processing (such as down conversion or A / D conversion) is performed on the radio signal, the signal that has undergone the radio reception processing is output to the guard removal section 103, and is also output to the pulse The PL extracting section 1121 of the response estimating section 112 .
[0068] In guard removal section 103, a guard interval is removed from the signal that has been subjected to radio reception processing, and the signal that has been subjected to guard interval removal proc...
Embodiment 2
[0083] In this example, the elimination from Figure 4 In the case of interference (internal leakage) of valid symbol A in part X and part Y, and recovery of loss of valid symbol B in part X and part Y.
[0084] Will Figure 5 The same designation in the Figure 8 neutralize Figure 5 Those corresponding parts in , and their detailed descriptions are omitted.
[0085] Radio signals are received by radio receiving section 102 via antenna 101 . In the radio reception section 102, predetermined radio reception processing is performed on the radio signal, the signal that has undergone the radio reception processing is output to the protection removal section 103 of step 1, and it is also output to the subtraction section 404 of step 2 and the step 2. Subtraction portion 406 of 3. exist Figure 8 In , the "step" names are used to simplify the description, and there are no special restrictions on their order, etc.
[0086] In guard removal section 103, a guard interval portio...
Embodiment 3
[0109] In Example 3, will describe the Figure 10 or Figure 12 The time window shown is set to the case of a time window.
[0110] for Figure 10 and Figure 12 The time window shown in , find the maximum delay time, and set the time window according to this maximum delay time. Possible methods of finding this maximum delay time include performing an IFFT on the channel impulse response in the same manner as in Example 1, and using this result, or, finding the impulse response on the reverse channel, measuring the maximum delay, and let that max delay message be sent. The method of transmitting the maximum delay information on the reverse channel is particularly effective in the case of high time resolution communications, for example, when the reverse channel is a CDMA channel.
[0111] Figure 13 is a block diagram showing the configuration of a radio receiving apparatus equipped with a multipath interference canceling apparatus according to Embodiment 3 of the presen...
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