System and method for bit timing synchronization in an adaptive direct sequence CDMA communication system
First Claim
1. In a direct sequence CDMA spread spectrum communication system, wherein spread spectrum communication signals comprising binary bits coded with spreading chip sequences are communicated between a transmitter and a receiver;
- a bit synchronization method for synchronizing receiver bit timing with transmitter bit timing comprising the steps of;
a) transmitting a direct sequence spread spectrum communication signal (DS-SS) including a redundant training bit sequence followed by a transmitter bit timing sequence coded with a spreading chip sequence;
b) despreading the DS-SS communication signal based on said redundant training bit sequence to provide a decoded communication signal; and
c) determining receiver bit timing offset based on the transmitter bit timing sequence and the decoded communication signal.
2 Assignments
0 Petitions
Accused Products
Abstract
In a CDMA communication system (100) capable of communicating between a receiver (20) and a transmitter (10) direct sequence spread spectrum communication signals (30), a system and method for synchronizing receiver bit timing and transmitter timing. Transmitter (10) transmits a training bit sequence (31) followed by a transmitter bit timing sequence (33). The receiver (20) adaptively determines a representation of a despreading chip sequence using a tapped delay line equalizer (400). Receiver bit timing offset is determined based on the representation of the despreading chip sequence and the transmitter bit timing sequence (33).
177 Citations
20 Claims
-
1. In a direct sequence CDMA spread spectrum communication system, wherein spread spectrum communication signals comprising binary bits coded with spreading chip sequences are communicated between a transmitter and a receiver;
- a bit synchronization method for synchronizing receiver bit timing with transmitter bit timing comprising the steps of;
a) transmitting a direct sequence spread spectrum communication signal (DS-SS) including a redundant training bit sequence followed by a transmitter bit timing sequence coded with a spreading chip sequence; b) despreading the DS-SS communication signal based on said redundant training bit sequence to provide a decoded communication signal; and c) determining receiver bit timing offset based on the transmitter bit timing sequence and the decoded communication signal. - View Dependent Claims (2, 3, 4, 5)
- a bit synchronization method for synchronizing receiver bit timing with transmitter bit timing comprising the steps of;
-
6. In a direct sequence CDMA receiver system capable of receiving spread spectrum communication signals comprising binary bits coded with a spreading chip sequence from a transmitter;
- a bit synchronization method for synchronizing receiver bit timing with transmitter bit timing comprising the steps of;
a) receiving a redundant training bit sequence; b) despreading the DS-SS communication signal based on said redundant training bit sequence to provide a decoded communication signal; c) receiving a transmitter bit timing sequence; and d) determining receiver bit timing offset based on the transmitter bit timing sequence and the decoded communication signal. - View Dependent Claims (7, 8, 9, 10)
- a bit synchronization method for synchronizing receiver bit timing with transmitter bit timing comprising the steps of;
-
11. A CDMA communication system for communicating direct sequence spread spectrum communication signals comprising:
-
a transmitter for transmitting a direct sequence spread spectrum (DS-SS) communication signal including a redundant training bit sequence followed by a transmitter bit timing sequence coded with a spreading chip sequence; a receiver for receiving said DS-SS communication signal including; despreading means for despreading the DS-SS communication signal based on said redundant training bit sequence and providing a decoded communication signal; and determination means for determining receiver bit timing offset based on said decoded communication signal and said transmitter bit timing sequence. - View Dependent Claims (12, 13, 14, 15)
-
-
16. A direct sequence CDMA receiver, comprising:
-
means for receiving a direct sequence spread spectrum communication signal including a redundant training bit sequence followed by a transmitter bit timing sequence coded with a spreading chip sequence; a despreading means for despreading the DS-SS communication signal based on said redundant training bit sequence and providing a decoded communication signal; and determination means for determining receiver bit timing offset based on said decoded communication signal and said transmitter bit timing sequence. - View Dependent Claims (17, 18, 19, 20)
-
Specification