Signal acquisition in a wireless communication system
First Claim
1. A method of transmitting pilot in a communication system, comprising:
- obtaining a pseudo-random number (PN) sequence used to uniquely identify a transmitting entity;
generating a first time division multiplexed (TDM) pilot;
generating a second TDM pilot with the PN sequence;
transmitting the first TDM pilot in a first portion of each transmission interval; and
transmitting the second TDM pilot in a second portion of each transmission interval.
1 Assignment
0 Petitions
Accused Products
Abstract
Each base station transmits a TDM pilot 1 having multiple instances of a pilot-1 sequence generated with a PN 1 sequence and a TDM pilot 2 having at least one instance of a pilot-2 sequence generated with a PN2 sequence. Each base station is assigned a specific PN2 sequence that uniquely identifies that base station. A terminal uses TDM pilot 1 to detect for the presence of a signal and uses TDM pilot 2 to identify base stations and obtain accurate timing. For signal detection, the terminal performs delayed correlation on received samples and determines whether a signal is present. If a signal is detected, the terminal performs direct correlation on the received samples with PN1 sequences for K1 different time offsets and identifies K2 strongest TDM pilot 1 instances. For time synchronization, the terminal performs direct correlation on the received samples with PN2 sequences to detect for TDM pilot 2.
-
Citations
66 Claims
-
1. A method of transmitting pilot in a communication system, comprising:
-
obtaining a pseudo-random number (PN) sequence used to uniquely identify a transmitting entity;
generating a first time division multiplexed (TDM) pilot;
generating a second TDM pilot with the PN sequence;
transmitting the first TDM pilot in a first portion of each transmission interval; and
transmitting the second TDM pilot in a second portion of each transmission interval. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A method of transmitting pilot in a communication system, comprising:
-
generating a first time division multiplexed (TDM) pilot with a first pseudo-random number (PN) sequence;
generating a second TDM pilot with a second PN sequence;
transmitting the first TDM pilot in a first portion of each transmission interval; and
transmitting the second TDM pilot in a second portion of each transmission interval. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
-
-
24. A method of transmitting pilot in a communication system, comprising:
-
generating a plurality of time division multiplexed (TDM) pilots with a plurality pseudo-random number (PN) sequences, one PN sequence for each TDM pilot; and
transmitting the plurality of TDM pilots in a plurality of time intervals of each transmission interval with TDM pilot transmission. - View Dependent Claims (25, 26)
-
-
27. An apparatus in a communication system, comprising:
-
a processor operative to generate a first time division multiplexed (TDM) pilot with a first pseudo-random number (PN) sequence and to generate a second TDM pilot with a second PN sequence; and
a multiplexer operative to multiplex the first TDM pilot in a first portion of each transmission interval and to multiplex the second TDM pilot in a second portion of each transmission interval. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36)
-
-
37. An apparatus in a communication system, comprising:
-
means for generating a first time division multiplexed (TDM) pilot with a first pseudo-random number (PN) sequence;
means for generating a second TDM pilot with a second PN sequence;
means for transmitting the first TDM pilot in a first portion of each transmission interval; and
means for transmitting the second TDM pilot in a second portion of each transmission interval. - View Dependent Claims (38, 39)
-
-
40. A method of performing acquisition in a communication system, comprising:
-
performing a first correlation on received samples to detect for a first time division multiplexed (TDM) pilot comprised of a plurality of instances of a first pilot sequence; and
if the first TDM pilot is detected, performing a second correlation on the received samples to detect for a second TDM pilot comprised of at least one instance of a second pilot sequence. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60)
-
-
61. An apparatus in a communication system, comprising:
-
a first correlator operative to perform a first correlation on received samples to detect for a first time division multiplexed (TDM) pilot comprised of a plurality of instances of a first pilot sequence; and
a second correlator operative to, if the first TDM pilot is detected, perform a second correlation on the received samples to detect for a second TDM pilot comprised of at least one instance of a second pilot sequence. - View Dependent Claims (62, 63)
-
-
64. An apparatus in a communication system, comprising:
-
means for performing a first correlation on received samples to detect for a first time division multiplexed (TDM) pilot comprised of a plurality of instances of a first pilot sequence; and
means for, if the first TDM pilot is detected, performing a second correlation on the received samples to detect for a second TDM pilot comprised of at least one instance of a second pilot sequence. - View Dependent Claims (65, 66)
-
Specification