Mobile radio apparatus

Details Mobile radio apparatus Mobile radio apparatus

1995-10-20

2000-04-04

Pham, Chi H.

Pulse or digital communications

Spread spectrum

Frequency hopping

375133, A61F 206, H04L 2730

Patent

active

060470151

ABSTRACT:
A mobile radio apparatus includes a base station and a mobile station which communicate with each other by a hybrid code division multiple access scheme. The base station selects a hopping pattern in a frequency hopping method so as to completely avoid overlapping of a carrier for a forward link signal with a carrier for a reverse link signal at the same time, and transmits the forward link signal in a predetermined frequency band. The mobile station similarly transmits the reverse link signal. The mobile station has a multiplier for multiplying the forward link signal by a carrier at the same frequency as the carrier for the forward link signal to derive a received signal, a communication channel correlator for detecting a correlation of the received signal to separate a communication channel signal, a received power level detector circuit for detecting a received power level of the communication channel signal, and a transmission power level control signal for controlling a transmission power level of the reverse link signal, when transmitted to the base station, based on the received power level of the communication channel signal, using a carrier at the same frequency as the carrier for the forward link signal when the received power level of the communication channel signal is detected.

REFERENCES:
patent: 5222098 (1993-06-01), Yamamoto et al.
patent: 5375140 (1994-12-01), Bustamante et al.
patent: 5499236 (1996-03-01), Giallorenzi et al.
patent: 5539728 (1996-07-01), Gaiani et al.
Shigeru Tomasato et al, "Coherent Hybrid DS-FFH CDMA Basic Performance in Mobile Radio Environment", Technical Report of IEICE, RCS92-103, 1993-01;, pp. 61-66.
R. Esmailzadeh et al, "Power Control in Packets Switched Time Division Duplex Sequence Spread Spectrum Communications", VTC'92, pp. 989-992.
Wu et al., Capacity of Synchronous Coded DS- SFH- and FFH- SSMA for Wireless Local Communications, May 1994.

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