Method and apparatus for true diversity reception with single antenna

• US 7,392,029 B2
• Filed: 11/26/2003
• Issued: 06/24/2008
• Est. Priority Date: 12/04/2002
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: NXP B.V. (NXP Semiconductors NV)
• Inventors: Pronkine, Viatcheslav
• Primary Examiner(s): Urban; Edward F.
• Assistant Examiner(s): HU, RUI MENG
• Application Number:
  US10/537,601
• Publication Number:
  US 20060017633A1
• Time in Patent Office: 1,672 Days
• Field of Search: 343/702, 343/756, 343/858, 333/21.A, 333/125, 333/127, 333/136, 455/269, 455/270, 455/272, 455/273, 455/277.1, 455/282
• US Class Current: 455/272
• CPC Class Codes: H01Q 21/29 Combinations of different interacting antenna units for giving a desired directional characteristic H01Q25/00 takes precedence
• CPC Class Codes: H01Q 9/30 with feed to end of elongated active element, e.g. unipole H01Q9/44 takes precedence
• CPC Class Codes: H04B 7/02 Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas RAKE receivers H04B1/7115
• CPC Class Codes: H04B 7/0837 using pre-detection combining H04B7/0868 takes precedence

Abstract

A system for wireless communication, particularly for receiving communication signals, said system comprising: A main antenna structure (330), said antenna structure adapted to receive a communication signal (325a) as a first internal signal; and an antenna cable, said antenna cable having a first end operationally coupled to said main antenna structure and a second end, said antenna cable including a main conductor (335) for passing said first internal signal, and a second receiving conductor (340), said second receiving conductor adapted to receive said communication signal as a second internal signal, and wherein said second receiving conductor as a receiving element is spatially separated from the main antenna structure. The disclosed antenna system and apparatus for the extraction of the second, spatially-separated received signal achieves spatial diversity to alleviate multipath effects in wireless communication systems.

Claims

1. An antenna system for receiving diversity signals from a single antenna, comprising:

a single antenna connected to a receiver by an inner conductor and an outer conductor of a coax cable;

said inner and outer conductors receiving a signal from a transmitter;

a first device for differentially extracting a first diversity signal from said received signal across said inner conductor and outer conductor at a near end of said coax cable in a differential mode; and

a second device for single-ended extraction of a second diversity signal from said received signal, said second device extracting said second diversity signal from said outer conductor of said coax cable in a common mode;

wherein said first and second diversity signals provide reception of truly spatially diverse communication signals from transmitter by receiver.

2. The antenna system of claim 1, further comprising:

a first transformer (380) with its primary windings connected across said inner conductor and outer conductor (340) at a near end of said coax cable (335), and its secondary windings providing an output fix said first diversity signal (376a) to a first receiver input load (360); and

a second transformer (380) with its primary windings connected to said outer conductor (340) at a near end of said coax cable (335), and a local ground, and its secondary windings providing an output for said second diversity signal (376i b) to a second receiver input load (361);

wherein, said primary windings of the first and second transformers (380 and 381) are stacked in series with each other.

3. A method for obtaining two diversity signals from a single antenna and coax cable, comprising:

connecting a single antenna to a receiver by an inner conductor and an outer conductor of a coax cable;

said inner and outer conductors receiving a signal from a transmitter;

differentially extracting a first diversity signal from said received signal across said inner conductor and outer conductor at a near end of said coax cable at a first input of said receiver; and

single-endedly extracting a second diversity signal from said received signal, said second diversity signal is extracted from said outer conductor of said coax cable with reference to a local ground at a second input of said receiver;

wherein said first and second diversity signals provide reception of truly spatially diverse communication signals from said transmitter by said receiver.