EP0620657A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Antenna switching circuit for a diversity receiver
Assignee: Panasonic Holdings Corp
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Filing: 1994-04-15
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Granted: —
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Expires: 2014-04-15
Abstract
Abstract The present invention discloses an antenna switched diversity receiver comprising a plurality of physically separated antennas, a switching unit for selectively switching to one of the plurality of antennas to receive a burst in a time series, a decoding unit for decoding transmission data contained in the received burst in a reversed manner to coding, a bit-error-detecting unit for detecting a bit error in decoded data in each received burst, and a control unit for controlling the switching unit in accordance with the bit-error detection result. The receiver may additionally include a RSSI checking unit for checking a RSSI of a switched antenna and a RSSI holding unit for holding a RSSI. The receiver constructed as above controls switching based on a bit error in each burst alone or together with the RSSI. As a result, the receiver obtains excellent diversity effect while being compact and economical.
Inventors
- 👤 Hitoshi Takai
- 👤 Hidetoshi Yamasaki
- 👤 Yoshio Urabe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 15:23
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04B7/04; H04B7/08; H04B7/0882; H04B7/0888; H04B7/0802; H04B7/0805; H04B7/0814; H04B7/0817; H04B7/082; H04L; H04L1/00; H04L1/02; H04L1/06
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
88 words
An antenna switched diversity receiver which receives bursts in a digital radio system, the receiver comprising: a plurality of physically separated antennas; switching means for selectively switching to one of said plurality of antennas to receive a burst in a time series; decoding means for decoding transmission data contained in said received burst in a reversed manner to coding; bit-error-detecting means for detecting a bit error in decoded data in each received burst; and control means for controlling said switching means in accordance with said bit-error detection result.
Claim 2
Dependent Claim
36 words
The receiver of Claim 1, wherein said control means activates said switching means when said bit-error-detecting means detects at least one bit error in each of sequential m bursts, m being an integer greater than one.
Claim 3
Dependent Claim
23 words
The receiver of Claim 2, wherein said control means includes antenna-designating means for designating an antenna to be switched in a predetermined order.
Claim 4
Dependent Claim
73 words
The receiver of Claim 2, wherein said bit-error-detecting means includes: reference data detecting means for detecting reference data in decoded data, said reference data being attached to each burst prior to transmission; and comparing means for comparing said detected reference data and comparison data, said comparison data being a replica of said reference data and held in said comparing means, whereby said bit-error-detecting means detects a bit error based on said comparison result.
Claim 5
Dependent Claim
63 words
The receiver of Claim 2, wherein said bit-error-detecting means includes: redundant code detecting means for detecting a redundant code in decoded data, said redundant code being attached to each burst prior to transmission; and computing means for carrying out a computation using said detected redundant code in a predetermined way, whereby said bit-error-detecting means detects a bit error based on said computing result.
Claim 6
Dependent Claim
60 words
The receiver of Claim 2, wherein said control means, after switching, controls said switching means by one of a first control manner and a second control manner, said switching means being allowed to successively switch to another antenna in said first control manner and being disallowed to switch to another antenna for a certain period in said second control manner.
Claim 7
Dependent Claim
24 words
The receiver of Claim 6, wherein, in said second control manner, said control means determines said certain period based on said receiver's transient response.
Claim 8
Dependent Claim
112 words
An antenna switched diversity receiver which receives bursts in a digital radio system, the receiver comprising: a plurality of physically separated antennas; switching means for selectively switching to one of said plurality of antennas to receive a burst in a time series; decoding means for decoding transmission data contained in said received burst in a reversed manner to coding; bit-error-detecting means for detecting a bit error in decoded data in each received burst; RSSI checking means for checking a RSSI of a switched antenna; RSSI holding means for holding a RSSI; and control means for controlling said switching means in accordance with both said bit-error detection result and said RSSI detection result.
Claim 9
Dependent Claim
54 words
The receiver of Claim 8, wherein said control means controls said switching means to switch to another antenna based on said bit-error detection result and subsequently controls said switching means in one of two ways to stay with said newly switched antenna and to switch to another antenna based on said RSSI checking result.
Claim 10
Dependent Claim
36 words
The receiver of Claim 9, wherein said control means activates said switching means when said bit-error-detecting means detects at least one bit error in each of sequential m bursts, m being an integer greater than one.
Claim 11
Dependent Claim
23 words
The receiver of Claim 10, wherein said control means includes antenna-designating means for designating an antenna to be switched in a predetermined order.
Claim 12
Dependent Claim
73 words
The receiver of Claim 10, wherein said bit-error-detecting means includes: reference data detecting means for detecting reference data in decoded data, said reference data being attached to each burst prior to transmission; and comparing means for comparing said detected reference data and comparison data, said comparison data being a replica of said reference data and held in said comparing means, whereby said bit-error-detecting means detects a bit error based on said comparison result.
Claim 13
Dependent Claim
63 words
The receiver of Claim 10, wherein said bit-error-detecting means includes: redundant code detecting means for detecting a redundant code in decoded data, said redundant code being attached to each burst prior to transmission; and computing means for carrying out a computation using said detected redundant code in a predetermined way, whereby said bit-error-detecting means detects a bit error based on said computing result
Claim 14
Dependent Claim
39 words
The receiver of Claim 10, wherein said control means controls said switching means not to switch to another antenna for a certain number of bursts after switching both based on said bit-error detection result and said RSSI detection result.
Claim 15
Dependent Claim
70 words
The receiver of Claim 10, wherein said RSSI checking means includes: checking means for checking a RSSI per burst; and a first output means for outputting a RSSI to said RSSI holding means, and wherein said RSSI holding means includes: delayed RSSI holding means for delaying a RSSI for one burst to hold said delayed RSSI; and a second output means for outputting a delayed RSSI to said control means.
Claim 16
Dependent Claim
63 words
The receiver of Claim 15, wherein said control means includes RSSI comparing means for comparing a RSSI held in said RSSI holding means and a delayed RSSI held in said delayed RSSI holding means, whereby said control means controls said switching means to switch back to an antenna which was selected before the switching when said RSSI is smaller than said delayed RSSI.
Claim 17
Dependent Claim
57 words
The receiver of Claim 15, wherein said control means controls said switching means to switch to all of said plurality of antennas in a predetermined order, and said RSSI holding means holds all RSSIs of said plurality of antennas, whereby said control means controls said switching means to switch to an antenna that has a greatest RSSI.
References Cited (Backward Citations)
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