G-Lers,
I think one might tend to miss the opportunity to add to this issue by the
sudden change of title of the debate which appears to be far too remote from
what is being discussed.
IT is New GRTS Digital Fm radio station and NOT Daft or Inept.
Best Regards,
Ablie Njie- Lekbi
>From: Mohinder Bains <[log in to unmask]>
>Reply-To: The Gambia and related-issues mailing list
><[log in to unmask]>
>To: [log in to unmask]
>Subject: Re: Daft or Inept
>Date: Thu, 28 Feb 2002 20:33:12 +0000
>
>Jungle wrote:
>
>"
><I assume you know that for decades the US military have been using spread
>spectrum technology to send digital information. A spread spectrum system
>is
>one in which the transmitted signal is spread
>over a wide frequency band, much wider, in fact, than the minimum bandwidth
>required to transmit the information being sent. This technology is used
>in
>cordless phones as well as to send control
>signals to probes and satelites.>"
>
>I dont think this has anything to do with a digital FM station. If that is
>what you are insinuating then the radio receivers would need a far more
>sophisticated circuitry to capture the signals being broadcast thus adding
>to the cost of what is already deemed very expensive. In fact this was
>done
>in order to facilitate the integrity of the USA Military communication
>across their military network ( Although some aspects of the technique are
>being exploited by Cellular Networks).
>
>Simply put, spread spectrum is a method by which a normally-narrowband
>radio
>signal is spread out to a much wider bandwidth before transmission takes
>place. Upon reception of the signal, the receiver recovers the original
>narrowband signal through the reverse process, naturally referred to as
>despreading. Spreading and despreading can be accomplished in many ways,
>but
>are usually done using one of two common techniques, direct sequence and
>frequency hopping.
>
>In direct sequence, the radio signal is multiplied by a pseudo-random
>sequence (PRBS) whose bandwidth is much greater than that of the signal
>itself, thereby spreading its bandwidth. In frequency hopping, the
>pseudo-random sequence is used to move the radio signal about, in a random
>fashion,across a broad frequency band (i.e. the frquency divided into sub-
>bands).
>
>Regardless of the spreading technique used, the purpose for doing so is to
>exploit one or more of the many benefits of spread spectrum:
>Interference rejection, signal hiding, frequency band sharing
>(code-division
>multiplexing)and anti-jam properties, which I hope is not a needed facet
>for
>a commercial Radio station. Why would a Radio Station hides its signals?
>
>In conclusion, the protocols underlying the use of these spread spectrum
>techniques requires them to operate under different architectures. One is
>ideal for an Infracstructure Network whilst the other is used in AD-Hoc
>networks as stipulated by the IEEE 802.11b standard for wireless.
>
>Even though Simulcast transmission was to be used the argument for
>justifying it(thus adding to recurring costs)in the present time would not
>be a sensible proposition.
>
>I hope this underpin what I surmised as to your understanding in earlier
>posting.
>
>Thanks
>Mohin
>
>
>
>
>
>
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