RF receiver with fast baseband switching

• US 8,055,207 B2
• Filed: 05/30/2007
• Issued: 11/08/2011
• Est. Priority Date: 12/06/2006
• Status: Expired due to Fees

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Behzad, Arya Reza, Gaikwad, Rohit V.
• Primary Examiner(s): Chen; Junpeng
• Application Number:
  US11/807,814
• Publication Number:
  US 20080139156A1
• Time in Patent Office: 1,623 Days
• Field of Search: 455/67.11, 455/67.14, 455/67.15, 455/67.16, 455/67.7, 455/70, 455/550.1, 455/552.1, 455/553.1, 455132-147, 455272-275, 4552761-2772, 455/69, 4551151-1154, 455/278.1, 455/279.1, 375/267, 375/295, 375/340, 375/349, 370/338
• US Class Current: 455/67.14
• CPC Class Codes: H04B 1/0067 with one or more circuit blocks in common for different bands

Abstract

A receiver includes a plurality of RF receiver modules, a plurality of analog baseband sections, a plurality of analog to digital conversion sections, and a digital baseband processing module. The RF receiver modules convert inbound RF signals into a plurality of inbound analog signals. When the receiver is in a first mode, one of the plurality of analog baseband sections is active to adjust one of the plurality of inbound analog signals to produce an adjusted inbound analog signal; one of the plurality of analog to digital conversion sections converts the adjusted inbound analog signal into an inbound digital signal; and a portion of the digital baseband processing module is active to convert the inbound digital signal into inbound data.

Claims

1. A receiver comprises:

a plurality of radio frequency (RF) receiver modules coupled to a plurality of antennas, wherein the plurality of RF receiver modules convert inbound RF signals into a plurality of inbound analog signals;

a plurality of analog baseband sections, wherein, when the receiver is in a first mode, only one of the plurality of analog baseband sections is selected from the plurality of analog baseband sections and selectively made active to adjust only one of the plurality of inbound analog signals to produce an adjusted inbound analog signal and, when the receiver is in a second mode, the plurality of analog baseband sections are made active to adjust the plurality of inbound analog signals to produce a plurality of adjusted inbound analog signals;

a plurality of analog to digital conversion sections, wherein, when the receiver is in the first mode, only one of the plurality of analog to digital conversion sections corresponding to the selected analog baseband section is selectively made active to convert the adjusted inbound analog signal into an inbound digital signal and, when the receiver is in the second mode, the plurality of analog to digital conversion sections are made active to convert the plurality of adjusted inbound analog signals into a plurality of inbound digital signals;

a digital baseband processing module, wherein, when the receiver is in the first mode, only a portion of the digital baseband processing module is made active to process the inbound digital signal into inbound data and, when the receiver is in the second mode, the digital baseband processing module is made active to process the plurality of inbound digital signals into second inbound data, wherein when in the first mode, only a single receive path is selectively made active to the digital baseband processing module and the digital baseband processing module performs baseband processing for the single receive path, and when in the second mode, plurality of receive paths are made active to the digital baseband processing module and the digital baseband processing module switches to perform baseband processing for the plurality of receive paths; and

a multiplexing module coupled to the plurality of RF receiver modules and the plurality of analog baseband sections, wherein, when the receiver is in the first mode, the multiplexing module selects only one of the plurality of inbound analog signals intended for processing and couples only the one selected inbound analog signal to the one analog baseband section made active from the plurality of analog baseband sections, but when the receiver is in the second mode, the multiplexing module couples the plurality of inbound analog signals to the plurality of analog baseband sections, in which the multiplexing module is configured to switch any one of the inbound analog signals to any one of the plurality of analog baseband sections and switches the one selected inbound analog signal to the selected analog baseband section when the receiver is in the first mode.

2. The receiver of claim 1, wherein an RF receiver module of the plurality of plurality of RF receiver modules comprises:

a low noise amplifier (LNA) module coupled to amplify a corresponding one of the inbound RF signals to produce an amplified inbound RF signal; and

a down conversion module coupled to convert the amplified inbound RF signal into a corresponding one of the plurality of inbound analog signals based on a receiver local oscillation.

3. The receiver of claim 2, wherein the RF receiver module further comprises at least one of:

an antenna interface module coupled to a corresponding one of the plurality of antennas, wherein the antenna interface module provides desire antenna matching for RF receiver module; and

an RF filter module coupled to bandpass filter the corresponding one of the inbound RF signals prior to amplification by the LNA module.

4. The receiver of claim 1, wherein an analog baseband section of the plurality of analog baseband sections comprises:

an analog baseband filtering module, wherein, when activated when the receiver is in the first mode, the analog baseband filtering module filters only the one inbound analog signal to produce a filtered inbound analog signal; and

an analog baseband gain module, wherein, when activated when the receiver is in the first mode, the analog baseband gain module amplifies or attenuates the filtered inbound analog signal to produce the adjusted inbound analog signal.

5. The receiver of claim 4 further comprises:

the analog baseband filtering module filtering a corresponding one of the plurality of inbound analog signals to produce a corresponding one of a plurality of filtered inbound analog signals when the receiver is in the second mode; and

the analog baseband gain module amplifying or attenuating the corresponding one of the plurality of filtered inbound analog signals to produce a corresponding one of the plurality of adjusted inbound analog signals when the receiver is in the second mode.

6. The receiver of claim 1 further comprises:

the first mode being a carrier sense mode; and

the second mode being a multiple input multiple output (MIMO) mode.

7. The receiver of claim 1, wherein the digital baseband processing module comprises:

a plurality of fast Fourier transform (FFT) modules, wherein, when the receiver is in the first mode, only one of the plurality of FFT modules is active to convert the inbound digital signal from the time domain to the frequency domain and, when the receiver is in the second mode, the plurality of FFT modules converts the plurality of inbound digital signals from the time domain to the frequency domain;

a space time decoding module, wherein, when the receiver is in the second mode, the space time decoding module space-time decodes the plurality of inbound digitals signals in the frequency domain to produce a plurality of space-time decoded inbound digital signals;

a plurality of demapping modules, wherein, when the receiver is in the first mode, only one of the plurality of demapping modules is active to demap the inbound digital signal in the frequency domain to produce a demapped digital signal and, when the receiver is in the second mode, the plurality of demapping modules demaps the plurality of space-time decoded inbound digital signals to produce a plurality of demapped digital signals;

deinterleaving module, wherein, when the receiver is in the first mode, the deinterleaving module deinterleaves the demapped digital signal to produce a deinterleaved digital signal and, when the receiver is in the second mode, the deinterleaving module deinterleaves the plurality of demapped digital signals to produce a second deinterleaved digital signal; and

a decoding module coupled to decode the deinterleaved digital signal to produce the inbound data when the receiver is in the first mode and to decode the second deinterleaved digital signal to produce the second inbound data when the receiver is in the second mode.

8. The receiver of claim 1, wherein the digital baseband processing module comprises:

a plurality of fast Fourier transform (FFT) modules, wherein, when the receiver is in the first mode, only one of the plurality of FFT modules is active to convert the inbound digital signal from the time domain to the frequency domain and, when the receiver is in the second mode, the plurality of FFT modules converts the plurality of inbound digital signals from the time domain to the frequency domain;

a plurality of demapping modules, wherein, when the receiver is in the first mode, only one of the plurality of demapping modules is active to demap the inbound digital signal in the frequency domain to produce a demapped digital signal and, when the receiver is in the second mode, the plurality of demapping modules demaps the plurality of inbound digital signals in the frequency domain to produce a plurality of demapped digital signals;

a plurality of deinterleaving modules, wherein, when the receiver is in the first mode, only one of the plurality of deinterleaving modules is active to deinterleave the demapped digital signal to produce a deinterleaved digital signal and, when the receiver is in the second mode, the plurality of deinterleaving modules is active to deinterleave the plurality of demapped digital signals to produce a plurality of deinterleaved digital signals; and

a plurality of decoding modules, wherein, when the receiver is in the first mode, only one of the plurality of decoding modules is active to decode the deinterleaved digital signal to produce the inbound data and, when the receiver is in the second mode, the plurality of decoding modules is active to decode the plurality of deinterleaved digital signals to produce the second inbound data.