Wireless access system, centralized control station, signal processing method, and recording medium
AssigneeNEC Corporation
InventorMasaaki TANIO
Life of this patent
Estimating the term…
Abstract
A wireless access system includes: a centralized control station; and an access point. The access point performs a pulse width modulation process on an analog uplink signal, thereby to generate an analog modulation signal; and converts the analog modulation signal to an optical uplink signal. The centralized control station converts the optical uplink signal to an electrical uplink signal; performs, on the electrical uplink signal, a filtering process for extracting an analog extraction signal including a signal component corresponding to the analog uplink signal; and converts the analog extraction signal to a digital uplink signal representing a signal level of the analog extraction signal by two or more bits.
Claims7
A wireless access system comprising:
- a centralized control station;
- and
- an access point connected to the centralized control station through an optical network,
- the access point including:
- a modulator that performs a pulse width modulation process on an analog uplink signal to be transmitted from the access point to the centralized control station, thereby to generate an analog modulation signal;
- and
- an optical signal convertor that converts the analog modulation signal to an optical uplink signal,
- the centralized control station including:
- an electrical signal convertor that converts the optical uplink signal transmitted from the access point to the centralized control station through the optical network, to an electrical uplink signal;
- a filter that performs, on the electrical uplink signal, a filtering process for extracting an analog extraction signal including a signal component corresponding to the analog uplink signal, from the electrical uplink signal;
- a digital signal convertor that converts the analog extraction signal to a digital uplink signal representing a signal level of the analog extraction signal by two or more bits;
- and
- a signal processor that performs a predetermined digital signal process on the digital uplink signal.
A signal processing method performed by using a wireless access system including:
- a centralized control station;
- and an access point connected to the centralized control station through an optical network,
- the signal processing method comprising:
- performing a pulse width modulation process on an analog uplink signal to be transmitted from the access point to the centralized control station, thereby to generate an analog modulation signal;
- converting the analog modulation signal to an optical uplink signal;
- converting the optical uplink signal transmitted from the access point to the centralized control station through the optical network, to an electrical uplink signal;
- performing, on the electrical uplink signal, a filtering process for extracting an analog extraction signal including a signal component corresponding to the analog uplink signal, from the electrical uplink signal;
- converting the analog extraction signal to a digital uplink signal representing a signal level of the analog extraction signal by two or more bits;
- and
- performing a predetermined digital signal process on the digital uplink signal.
A non-transitory recording medium on which a computer program that allows a computer to execute a signal processing method is recorded, the signal processing method being performed by using a wireless access system including:
- a centralized control station;
- and an access point connected to the centralized control station through an optical network,
- the signal processing method including:
- performing a pulse width modulation process on an analog uplink signal to be transmitted from the access point to the centralized control station, thereby to generate an analog modulation signal;
- converting the analog modulation signal to an optical uplink signal;
- converting the optical uplink signal transmitted from the access point to the centralized control station through the optical network, to an electrical uplink signal;
- performing, on the electrical uplink signal, a filtering process for extracting an analog extraction signal including a signal component corresponding to the analog uplink signal, from the electrical uplink signal;
- converting the analog extraction signal to a digital uplink signal representing a signal level of the analog extraction signal by two or more bits;
- and
- performing a predetermined digital signal process on the digital uplink signal.
Dependencies are inferred from the claim text.