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US 8,805,282 B2Granted
Radio transmission system and interference compensation method
AssigneeNEC Corporation
InventorMasahiro Kawai
Life of this patent
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Abstract
A radio transmission system includes a MIMO reception processing unit for performing reception-side MIMO processing to output a plurality of reception modulated signals respectively corresponding to a plurality of unique paths. The system further includes an interference compensation unit for compensating inter-path interference contained in the plurality of reception modulated signals.
Claims10
A radio transmission system in which a MIMO technology is applied to line-of-sight communication, the system comprising:
- a MIMO (Multiple Input Multiple Output) reception processing unit that performs reception-side MIMO processing to output a plurality of reception modulated signals respectively corresponding to a plurality of unique paths;
- an interference compensation unit that receives corresponding one of the reception modulated signals from the MIMO reception processing unit to cancel inter-path interference contained therein and caused as interference between the unique paths by difference in propagation delay according to antenna-to-antenna distances;
- and
- a carrier regenerator provided in association with each of the plurality of reception modulated signals for demodulating an input modulated signal and outputting the demodulated signal,
- wherein the interference compensation unit comprises:
- an error detector which, upon receiving the demodulated signal, detects a deviation of the demodulated signal from an ideal signal point and generates an error signal representing the phase direction and amplitude of the deviation;
- a compensation signal generator which generates a compensation signal for cancelling the inter-path interference contained in the corresponding reception modulated signal with the use of the error signal;
- and
- an adder which adds the compensation signal to the corresponding reception modulated signal and outputs the addition result to the carrier regenerator as the input modulated signal.
6 more elements
An interference compensation method comprising the steps of:
- performing reception-side MIMO (Multiple Input Multiple Output) processing to output a plurality of reception modulated signals respectively corresponding to a plurality of unique paths;
- and
- receiving, after performing the reception-side MIMO processing, corresponding one of reception modulated signals to cancel inter-path interference contained therein and caused as interference between the unique paths by difference in propagation delay according to antenna-to-antenna distances,
- wherein the interference compensation step comprises the steps of:
- receiving the demodulated signal from a carrier regenerator provided in association with each of the plurality of reception modulated signals for demodulating an input modulated signal and outputting the demodulated signal;
- detecting a deviation of the demodulated signal from an ideal signal point to generate an error signal representing the phase direction and amplitude of the deviation;
- generating a compensation signal for cancelling the inter-path interference contained in a corresponding reception modulated signal with the use of the error signal;
- and
- adding the compensation signal to the corresponding reception modulated signal to output the addition result to the carrier regenerator as the input modulated signal.
6 more elements
Dependencies are inferred from the claim text.