[특허]Multichannel wideband digital receiver making use of multiple wideband tuners having individually selectable gains to ex

[미국특허] Multichannel wideband digital receiver making use of multiple wideband tuners having individually selectable gains to ex 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H03K-009/00 H04B-001/06 H04Q-011/00
출원번호	US-0231262 (1994-04-22)
발명자 / 주소	Carney Ronald (916 Flower St. NW. Palm Bay FL 32907)
인용정보	피인용 횟수 : 75 인용 특허 : 0

초록 ▼

A technique for extending the instantaneous dynamic range available in a wideband digital basestation for use in a wireless communication network. The basestation processes the bandwidth allocated to it in two or more sub-bands. The sub-bands are each processed by a digital tuner section consisting of an amplifier, analog-to-digital (A/D) converter, and digital filter bank. The digital filter bank may make use of multirate digital signal recovery techniques for efficient implementation. In operation, a received signal strength indication (RSSI) is first determined for each subscriber unit requesting access to the basestation. A channel assignment controller then assigns a transmit frequency to the subscriber unit depending upon this RSSI. In particular, subscriber units exhibiting a relatively stronger RSSI are to transmit on a frequency assigned to a first digital tuner section, while subscriber units having a relatively weak RSSI are assigned to a second digital tuner section. The gains of the first and second tuner sections of each other adjusted independently, to insure that the relatively strong signals are not clipped by the first tuner section, and that the relatively weak signals may be correctly detected by the second tuner section. The net effect is to provide a much greater overall system dynamic range. The invention can be used to advantage in both existing AMPS type cellular systems as well as CDMA systems.

대표청구항 ▼

A basestation for processing signals in a multiple subscriber unit wireless communication system comprising: an antenna for receiving signals from a plurality of the subscriber units; a power splitter, connected to the antenna, to provide a plurality of power splitter output signals; a plurality of gain control means, each one of the gain control means being connected to receive a respective one of the power splitter output signals, and each gain control means having a separately adjustable gain control input, and each gain control means providing a wideband signal; a plurality of wideband tuner sections, with each tuner section being connected to receive one of the wideband signals, and with each wideband tuner section operating over a respectively different frequency bandwidth, and each wideband tuner section being connected to provide a wideband tuner output signal; a plurality of channelization means, each channelization means being connected to receive a respective one of the wideband tuner output signals, and with each channelization means providing multiple channel signal outputs, each channel signal output having a predetermined channel bandwidth; and channel assignment means, including: (i) access control signal receiving means, for receiving an access control signal requesting access to a radio frequency channel by a selected one of the subscriber units, and for determining a received signal strength indication, RSSI, of that access control signal; (ii) means for generating a frequency control signal designating a selected transmit frequency, and for receiving the RSSI of the access control signal, the selected transmit frequency being selected from within a first frequency bandwidth over which a first one of the plurality of wideband tuner sections operates if the RSSI is above a minimum threshold and within a first range of signal strengths associate with the first wideband tuner section, and the transmit frequency being selected within a second frequency bandwidth over which a second one of the plurality of wideband tuner sections operates if the RSSI is above the minimum threshold and within a second range of signals strengths associated with the second wideband tuner section; and (iii) frequency assignment means for receiving the frequency control signal and for assigning the selected subscriber unit to operate on the selected transmit frequency.

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[미국특허] Multichannel wideband digital receiver making use of multiple wideband tuners having individually selectable gains to ex 원문보기

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[미국특허] Multichannel wideband digital receiver making use of multiple wideband tuners having individually selectable gains to ex 원문보기

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