Radio frequency architecture for spectrum access networks

• US 8,437,314 B2
• Filed: 02/21/2008
• Issued: 05/07/2013
• Est. Priority Date: 02/22/2007
• Status: Active Grant

• Current Assignee: STMicroelectronics Incorporated (STMicroelectronics NV)
• Original Assignee: STMicroelectronics Incorporated (STMicroelectronics NV)
• Inventors: Vlantis, George A., Hu, Wendong
• Primary Examiner(s): Hsu, Alpus H
• Assistant Examiner(s): LAM, YEE F
• Application Number:
  US12/035,353
• Publication Number:
  US 20080207204A1
• Time in Patent Office: 1,902 Days
• Field of Search: 370/334, 370/338, 375/219, 375/240.06, 375/307, 455/87, 455/193.1, 455/209, 455/315, 455/562.1
• US Class Current: 370/334
• CPC Class Codes: H04B 1/28 the receiver comprising at least one semiconductor device having three or more electrodes
• CPC Class Codes: H04B 1/40 Circuits
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 74/00 Wireless channel access
• CPC Class Codes: H04W 84/10 Small scale networks; Flat hierarchical networks

Abstract

Radio frequency (RF) architectures for spectrum access networks are provided. Embodiments of the invention generally provide a radio frequency (RF) architecture for customer premise equipment (CPE) for use in, for example, IEEE 802.22 wireless regional area networks (WRANs). In some embodiments, the CPE RF architecture includes two receive chains with a directional antenna and an omni-directional antenna, respectively. The CPE RF architecture facilitates opportunistic out-of-band spectrum sensing and WRAN signal receiving that are performed in parallel with data transmission.

Claims

1. A coordinated pair of circuits in a Consumer Premise Equipment (CPE) in a Wireless Regional Area Network (WRAN) comprising an out-of-band sensing circuit, and a transmitting and receiving circuit,

wherein the out-of-band sensing circuit comprises:

an omnidirectional sensing antenna;

a first tunable pre-selective filter coupled to the omnidirectional sensing antenna;

a first low noise amplifier coupled to the first tunable pre-selective filter;

a first mixer coupled to the low noise amplifier;

a first tunable local oscillator coupled to the first mixer;

a first channel filter coupled to the first mixer;

a first WRAN synchronization demodulator module coupled to the first channel filter; and

a sensing scheme module coupled to the first channel filter,

wherein the first tunable pre-selective filter and the first tunable local oscillator receive a first common tuning signal, and

wherein the first WRAN synchronization demodulator module is configured to ignore in-band signals but detect other, out-of-band, WRAN signals, either from other WRAN base stations, television channels, or from other Consumer Premise Equipment;

wherein the transmitting and receiving circuit comprises;

a directional antenna operable both as a transmitter and a receiver;

a radio frequency (RF) switch coupled to the directional antenna;

an in-band demodulation circuit coupled to the RF switch;

an in-band modulation circuit coupled to the RF switch; and

wherein the out-of-band sensing circuit can operate at the same time that normal transmission and reception occurs on the transmitting and receiving circuit between the CPE and the base station to which the CPE is subscribed.

2. The coordinated pair of circuits of claim 1, wherein the sensing scheme module is capable of performing spectrum sensing using a variety of different devices, including at least one of an energy detector, a picture detector, a correlated detector, a part 74 detector, a TG1 Beacon detector.

3. The coordinated pair of circuits of claim 1, wherein the in-band demodulation circuit comprises:

a second tunable pre-selective filter coupled to the RF switch;

a second low noise amplifier coupled to the second tunable pre-selective filter;

a second mixer coupled to the second low noise amplifier;

a second tunable local oscillator coupled to the second mixer;

a second channel filter coupled to the second mixer; and

a second WRAN synchronization demodulator module coupled to the second channel filter,

wherein the second pre-selective filter and the second local oscillator receive a second common tuning signal.

4. The coordinated pair of circuits of claim 3, wherein the in-band modulation circuit comprises:

a WRAN encoding and modulation block;

a third mixer coupled to the WRAN encoding and modulation block and coupled to the second tunable local oscillator;

a high power amplifier (HPA) coupled to the third mixer; and

a tunable selectable output filter coupled to the HPA and the second tunable pre-selective filter,

wherein the selectable output filter receives the second common tuning signal.

5. The coordinated pair of circuits of claim 1, wherein the out-of-band sensing circuit is configured to receive outside data from an unsubscribed base station (BS) or consumer premise equipment (CPE).

6. A wireless regional area network (WRAN) consumer premise equipment (CPE) radio frequency (RF) system, comprising:

first, an out-of-band sensing circuit capable of out-band spectrum sensing comprising;

an omnidirectional sensing antenna;

a first tunable pre-selective filter coupled to the omnidirectional sensing antenna;

a first low noise amplifier coupled to the first tunable pre-selective filter;

a first mixer coupled to the low noise amplifier;

a first tunable local oscillator coupled to the mixer;

a first channel filter coupled to the mixer;

a first WRAN synchronization demodulator module coupled to the first channel filter; and

a sensing scheme module coupled to the first channel filter,

wherein the first tunable pre-selective filter and the first tunable local oscillator receive a first common tuning signal, and wherein

the first WRAN synchronization demodulator module is configured to ignore in-band signals but detect other, out-of-band, WRAN signals, either from other WRAN base stations, television channels, or from other Consumer Premise Equipment,

and, second, an in-band WRAN signal transmitting and receiving circuit comprising;

a directional antenna operable both as a transmitter and a receiver;

a RF switch coupled to the directional antenna;

an in-band demodulation circuit coupled to the RF switch;

an in-band modulation circuit coupled to the RF switch; and

wherein the out-of-band sensing circuit and the transmitting and receiving circuits are operated to perform, respectively, in parallel, out-band WRAN signal receiving on the omnidirectional antenna, and data transmission and reception on the directional antenna.

7. The system of claim 6, wherein the sensing scheme module is capable of performing spectrum sensing using a variety of different devices including at least one of an energy detector, a picture detector, a correlated detector, a part 74 detector, a TG1 Beacon detector.

8. The system of claim 6, wherein the in-band demodulation circuit comprises:

a directional antenna;

a RF switch coupled the antenna;

a second tunable pre-selective filter coupled to the RF switch;

a second low noise amplifier coupled to the second tunable pre-selective filter;

a second mixer coupled to the second low noise amplifier;

a second tunable local oscillator coupled to the second mixer;

a second channel filter coupled to the second mixer; and

a second WRAN synchronization demodulator module coupled to the second channel filter,

wherein the second pre-selective filter and the second tunable local oscillator receive a second common tuning signal.

9. The system of claim 8, wherein the in-band modulation circuit comprises:

a WRAN encoding and modulation block;

a third mixer coupled to the WRAN encoding and modulation block and coupled to the second tunable local oscillator;

a high power amplifier (HPA) coupled to the third mixer; and

a tunable selectable output filter coupled to the HPA and the second tunable pre-selective filter.

10. The system of claim 9, wherein the first WRAN synchronization demodulator module is operated to ignore in-band signals but detect other WRAN signals, either from other WRAN base stations, television channels, or from other Consumer Premise Equipment.

11. The system of claim 9, wherein the system is configured so that the out-of-band sensing circuit also decodes a detected WRAN system'"'"'s transmission.

12. The system of claim 9, wherein the system is configured to receive and decode CPE signals from neighboring systems while communicating on a channel with its base station (BS).

13. The system of claim 8, wherein the data from the directional antenna is to or from a subscribed base station (BS).