Receiver and base station for producing phase-corrected channel signals

• US 7,110,443 B2
• Filed: 07/26/2005
• Issued: 09/19/2006
• Est. Priority Date: 05/14/1998
• Status: Expired due to Fees

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Ozluturk, Fatih M., Mesecher, David K., Jacques, Alexander M.
• Primary Examiner(s): Tran, Khai
• Application Number:
  US11/189,370
• Publication Number:
  US 20050254557A1
• Time in Patent Office: 420 Days
• Field of Search: 375/152, 375/147, 375/150, 375/130, 375/376, 375/375, 375/341, 370/342, 370/320, 370/335, 370/441
• US Class Current: 375/152
• CPC Class Codes: H04B 1/30 for homodyne or synchrodyne receivers demodulator circuits H03D1/22
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 1/70755 Setting of lock conditions, e.g. threshold
• CPC Class Codes: H04B 1/7085 using a code tracking loop, e.g. a delay-locked loop
• CPC Class Codes: H04B 1/7093 Matched filter type
• CPC Class Codes: H04B 1/7115 Constructive combining of multi-path signals, i.e. RAKE receivers
• CPC Class Codes: H04B 2201/70701 featuring pilot assisted reception
• CPC Class Codes: H04L 2027/0067 Phase error detectors
• CPC Class Codes: H04L 25/0212 of impulse response
• CPC Class Codes: H04L 27/0014 Carrier regulation of chaotic carriers H04L27/001; for multicarrier receivers H04L27/2657
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A receiver and base station for producing phase-corrected channel signals. An adaptive matched filter produces a filtered signal by using a weighting signal. A rake receiver produces a filter weighting signal using a pseudo-noise signal generator. A channel despreader despreads the filtered signal using the pseudo-noise signal generated to produce a despread channel signal of the selected channel. A pilot channel despreader despreads the filtered signal using a pseudo-noise signal generator to produce a despread pilot signal of the pilot channel. A hard decision processor receives the despread channel signal of the selected channel and produces a correction signal. A phase-locked loop utilizes at least the despread pilot signal and produces a phase correction signal which is applied to produce phase-corrected channel signals.

Claims

1. A receiver for receiving at least one of a plurality of channels in a communication signal, the receiver comprising:

(a) a hard decision processor in association with a complex conjugate processor for receiving a despread channel signal of a selected channel and producing a correction signal; and

(b) a phase-locked loop (PLL) configured to utilize a despread pilot signal of a pilot channel for producing a phase correction signal which is applied to produce phase-corrected channel signals.

2. The receiver of claim 1 further comprising:

(c) an adaptive matched filter for receiving communication signals producing a filtered signal by using a weighting signal;

(d) a rake receiver for receiving the communication signals and a pseudo-noise signal generated for a selected channel and producing a filter weighting signal;

(e) means for defining the filter weighting signal with the correction signal, said correction signal to produce the weighting signal used by said adaptive matched filter;

(f) a channel despreader for said selected channel coupled to said adaptive matched filter output for despreading the filtered signal using the pseudo-noise signal generated for the selected channel to produce a despread channel signal of the selected channel; and

(g) a pilot channel despreader for a pilot channel coupled to the adaptive matched filter output for despreading the filtered signal using a pseudo-noise signal generator for the pilot channel to produce a despread pilot signal of the pilot channel.

3. The receiver of claim 2 further comprising a plurality of channel despreaders, each coupled to said adaptive matched filter output for despreading said filtered signal each using an associated pseudo-noise signal generator to produce a plurality of despread channel signals.

4. The receiver of claim 3 wherein the number of channel despreaders is three.

5. The receiver of claim 1 wherein the phase correction signal is at a chip level and is applied to the received signals.

6. The receiver of claim 3 wherein each of the plurality of channels is a complex, bi-phase modulated signal comprised of symbols including in-phase and quadrature components representing data, the hard decision processor compares each despread channel signal symbol to one of four possible quadrature constellation points and assigns each of said symbols to a nearest constellation point, and the complex conjugate processor derotates each of said symbols by determining a complex conjugate of each of the assigned points to produce said correction signal.

7. The receiver of claim 3 wherein said phase-locked loop further comprises a plurality of inputs corresponding with the plurality of channel despreaders.

8. A base station for receiving at least one of a plurality of channels in a communication signal, the base station comprising:

(a) a hard decision processor in association with a complex conjugate processor for receiving a despread channel signal of a selected channel and producing a correction signal; and

(b) a phase-locked loop (PLL) configured to utilize a despread pilot signal of a pilot channel for producing a phase correction signal which is applied to produce phase-corrected channel signals.

9. The base station of claim 8 further comprising:

(c) an adaptive matched filter for receiving communication signals producing a filtered signal by using a weighting signal;

(d) a rake receiver for receiving the communication signals and a pseudo-noise signal generated for a selected channel and producing a filter weighting signal;

(e) means for defining the filter weighting signal with the correction signal, said correction signal to produce the weighting signal used by said adaptive matched filter;

(f) a channel despreader for said selected channel coupled to said adaptive matched filter output for despreading the filtered signal using the pseudo-noise signal generated for the selected channel to produce a despread channel signal of the selected channel; and

(g) a pilot channel despreader for a pilot channel coupled to the adaptive matched filter output for despreading the filtered signal using a pseudo-noise signal generator for the pilot channel to produce a despread pilot signal of the pilot channel.

10. The base station of claim 9 further comprising a plurality of channel despreaders, each coupled to said adaptive matched filter output for despreading said filtered signal each using an associated pseudo-noise signal generator to produce a plurality of despread channel signals.

11. The base station of claim 10 wherein the number of channel despreaders is three.

12. The base station of claim 8 wherein the phase correction signal is at a chip level and is applied to the received signals.

13. The base station of claim 10 wherein each of the plurality of channels is a complex, bi-phase modulated signal comprised of symbols including in-phase and quadrature components representing data, the hard decision processor compares each despread channel signal symbol to one of four possible quadrature constellation points and assigns each of said symbols to a nearest constellation point, and the complex conjugate processor derotates each of said symbols by determining a complex conjugate of each of the assigned points to produce said correction signal.

14. The base station of claim 8 wherein said phase-locked loop further comprises a plurality of inputs corresponding with the plurality of channel despreaders.