Interference cancellation in a spread spectrum communication system

• US 9,270,327 B2
• Filed: 05/12/2015
• Issued: 02/23/2016
• Est. Priority Date: 09/10/1999
• Status: Expired due to Fees

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Mesecher, David K., Reznik, Alexander, Grieco, Donald M., Cheung, Gary
• Primary Examiner(s): SHAH, TANMAY K
• Application Number:
  US14/710,162
• Publication Number:
  US 20150244417A1
• Time in Patent Office: 287 Days
• Field of Search: 375/144
• US Class Current: 1/1
• CPC Class Codes: H04B 1/7097 Interference-related aspects
• CPC Class Codes: H04B 1/7103 the interference being multiple access interference
• CPC Class Codes: H04B 1/712 Weighting of fingers for combining, e.g. amplitude control or phase rotation using an inner loop
• CPC Class Codes: H04B 2201/70701 featuring pilot assisted reception
• CPC Class Codes: H04B 7/0613 using simultaneous transmission H04B7/0686 takes precedence
• CPC Class Codes: H04B 7/0615 of weighted versions of same signal
• CPC Class Codes: H04B 7/0619 using feedback from receiving side feedback signaling for adaptive modulation/coding H04L1/0001
• CPC Class Codes: H04B 7/0634 Antenna weights or vector/matrix coefficients
• CPC Class Codes: H04B 7/0678 using different spreading codes between antennas code allocation H04J13/16
• CPC Class Codes: H04B 7/0845 per branch equalization, e.g. by an FIR-filter or RAKE receiver per antenna branch rake receivers as such H04B1/7115
• CPC Class Codes: H04B 7/0854 using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion
• CPC Class Codes: H04B 7/0857 using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS]
• CPC Class Codes: H04B 7/0891 Space-time diversity rake receivers H04B1/7115; space-time decoding H04L1/0631
• CPC Class Codes: H04J 13/0003 Code application, i.e. aspects relating to how codes are applied to form multiplexed channels

Abstract

A method and apparatus used to transmit and receive weighted data transmissions over a plurality of antennas using a plurality of different pilot signals. Different pilot signals are produced and a different pilot signal of the plurality of pilot signals is transmitted on each of a plurality of antennas. Each of the pilot signals is derived from a pseudo noise (PN) sequence and a bit sequence of the PN sequence for each of the pilot signals is different. A plurality of data streams are produced in which each of the data streams has data bits combined with bits of a PN sequence. The data streams are weighted in response to weight information received from a receiving device and the plurality of weighted data streams are transmitted using the plurality of antennas.

Claims

1. A transmitting device comprising:

circuitry configured to produce a plurality of pilot signals;

wherein a different pilot signal of the plurality of pilot signals is transmitted on each of a plurality of antennas;

wherein each of the pilot signals is derived from a pseudo noise (PN) sequence and a bit sequence of the PN sequence for each of the pilot signals is different;

the circuitry is further configured to produce a plurality of data streams;

wherein each of the data streams has data bits combined with bits of a PN sequence; and

the circuitry is further configured to weight the data streams in response to weight information received from a receiving device and transmit the plurality of weighted data streams using the plurality of antennas.

2. The transmitting device of claim 1 wherein the plurality of weighted data streams are transmitted to the receiving device.

3. A method for use by a transmitting device, the method comprising:

producing a plurality of pilot signals;

wherein a different pilot signal of the plurality of pilot signals is to be transmitted on a respective one of a plurality of antennas;

wherein each of the pilot signals is derived from a pseudo noise (PN) sequence and a bit sequence of the PN sequence for each of the pilot signals is different;

producing a plurality of data streams;

wherein bits of each of the data streams has data bits combined with bits of a PN sequence;

weighing the data streams in response to weight information received from a receiving device; and

transmitting the plurality of pilots signals and the weighted data streams using the plurality of antennas.

4. The method of claim 3 wherein the plurality of data streams are transmitted to the receiving device.

5. A receiving device comprising:

circuitry configured to transmit weight information to a transmitting device for use in weighting a plurality of data streams;

the circuitry is further configured to receive a downlink signal including a plurality of pilot signals and a plurality of data streams;

wherein a different pilot signal of the plurality of pilot signals was transmitted from a different antenna of a plurality of antennas of a transmitting device;

wherein each of the pilot signals was derived from a pseudo noise (PN) sequence and a bit sequence of the PN sequence for each of the pilot signals is different; and

the circuitry is further configured to recover data from the plurality of data streams;

wherein each of the data streams has data bits combined with bits of a PN sequence;

wherein each of the data streams was weighted based on the transmitted weight information.